giotto/build/giotto.js

// https://github.com/quantmind/giotto Version 0.1.3. Copyright 2016 quantmind.com.
(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.giotto = global.giotto || {})));
}(this, (function (exports) { 'use strict';

var ascending = function (a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
};

var bisector = function (compare) {
  if (compare.length === 1) compare = ascendingComparator(compare);
  return {
    left: function left(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) < 0) lo = mid + 1;else hi = mid;
      }
      return lo;
    },
    right: function right(a, x, lo, hi) {
      if (lo == null) lo = 0;
      if (hi == null) hi = a.length;
      while (lo < hi) {
        var mid = lo + hi >>> 1;
        if (compare(a[mid], x) > 0) hi = mid;else lo = mid + 1;
      }
      return lo;
    }
  };
};

function ascendingComparator(f) {
  return function (d, x) {
    return ascending(f(d), x);
  };
}

var ascendingBisect = bisector(ascending);
var bisectRight = ascendingBisect.right;
var bisectLeft = ascendingBisect.left;

var descending = function (a, b) {
  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
};

var number = function (x) {
  return x === null ? NaN : +x;
};

var variance = function (array, f) {
  var n = array.length,
      m = 0,
      a,
      d,
      s = 0,
      i = -1,
      j = 0;

  if (f == null) {
    while (++i < n) {
      if (!isNaN(a = number(array[i]))) {
        d = a - m;
        m += d / ++j;
        s += d * (a - m);
      }
    }
  } else {
    while (++i < n) {
      if (!isNaN(a = number(f(array[i], i, array)))) {
        d = a - m;
        m += d / ++j;
        s += d * (a - m);
      }
    }
  }

  if (j > 1) return s / (j - 1);
};

var deviation = function (array, f) {
  var v = variance(array, f);
  return v ? Math.sqrt(v) : v;
};

var extent$1 = function (array, f) {
  var i = -1,
      n = array.length,
      a,
      b,
      c;

  if (f == null) {
    while (++i < n) {
      if ((b = array[i]) != null && b >= b) {
        a = c = b;break;
      }
    }while (++i < n) {
      if ((b = array[i]) != null) {
        if (a > b) a = b;
        if (c < b) c = b;
      }
    }
  } else {
    while (++i < n) {
      if ((b = f(array[i], i, array)) != null && b >= b) {
        a = c = b;break;
      }
    }while (++i < n) {
      if ((b = f(array[i], i, array)) != null) {
        if (a > b) a = b;
        if (c < b) c = b;
      }
    }
  }

  return [a, c];
};

var array = Array.prototype;

var slice = array.slice;
var map = array.map;

var constant$1 = function (x) {
  return function () {
    return x;
  };
};

var identity = function (x) {
  return x;
};

var range = function (start, stop, step) {
  start = +start, stop = +stop, step = (n = arguments.length) < 2 ? (stop = start, start = 0, 1) : n < 3 ? 1 : +step;

  var i = -1,
      n = Math.max(0, Math.ceil((stop - start) / step)) | 0,
      range = new Array(n);

  while (++i < n) {
    range[i] = start + i * step;
  }

  return range;
};

var e10 = Math.sqrt(50);
var e5 = Math.sqrt(10);
var e2 = Math.sqrt(2);

var ticks = function (start, stop, count) {
  var step = tickStep(start, stop, count);
  return range(Math.ceil(start / step) * step, Math.floor(stop / step) * step + step / 2, // inclusive
  step);
};

function tickStep(start, stop, count) {
  var step0 = Math.abs(stop - start) / Math.max(0, count),
      step1 = Math.pow(10, Math.floor(Math.log(step0) / Math.LN10)),
      error = step0 / step1;
  if (error >= e10) step1 *= 10;else if (error >= e5) step1 *= 5;else if (error >= e2) step1 *= 2;
  return stop < start ? -step1 : step1;
}

var sturges = function (values) {
  return Math.ceil(Math.log(values.length) / Math.LN2) + 1;
};

var histogram = function () {
  var value = identity,
      domain = extent$1,
      threshold = sturges;

  function histogram(data) {
    var i,
        n = data.length,
        x,
        values = new Array(n);

    for (i = 0; i < n; ++i) {
      values[i] = value(data[i], i, data);
    }

    var xz = domain(values),
        x0 = xz[0],
        x1 = xz[1],
        tz = threshold(values, x0, x1);

    // Convert number of thresholds into uniform thresholds.
    if (!Array.isArray(tz)) tz = ticks(x0, x1, tz);

    // Remove any thresholds outside the domain.
    var m = tz.length;
    while (tz[0] <= x0) {
      tz.shift(), --m;
    }while (tz[m - 1] >= x1) {
      tz.pop(), --m;
    }var bins = new Array(m + 1),
        bin;

    // Initialize bins.
    for (i = 0; i <= m; ++i) {
      bin = bins[i] = [];
      bin.x0 = i > 0 ? tz[i - 1] : x0;
      bin.x1 = i < m ? tz[i] : x1;
    }

    // Assign data to bins by value, ignoring any outside the domain.
    for (i = 0; i < n; ++i) {
      x = values[i];
      if (x0 <= x && x <= x1) {
        bins[bisectRight(tz, x, 0, m)].push(data[i]);
      }
    }

    return bins;
  }

  histogram.value = function (_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant$1(_), histogram) : value;
  };

  histogram.domain = function (_) {
    return arguments.length ? (domain = typeof _ === "function" ? _ : constant$1([_[0], _[1]]), histogram) : domain;
  };

  histogram.thresholds = function (_) {
    return arguments.length ? (threshold = typeof _ === "function" ? _ : Array.isArray(_) ? constant$1(slice.call(_)) : constant$1(_), histogram) : threshold;
  };

  return histogram;
};

var threshold = function (array, p, f) {
  if (f == null) f = number;
  if (!(n = array.length)) return;
  if ((p = +p) <= 0 || n < 2) return +f(array[0], 0, array);
  if (p >= 1) return +f(array[n - 1], n - 1, array);
  var n,
      h = (n - 1) * p,
      i = Math.floor(h),
      a = +f(array[i], i, array),
      b = +f(array[i + 1], i + 1, array);
  return a + (b - a) * (h - i);
};

var freedmanDiaconis = function (values, min, max) {
  values = map.call(values, number).sort(ascending);
  return Math.ceil((max - min) / (2 * (threshold(values, 0.75) - threshold(values, 0.25)) * Math.pow(values.length, -1 / 3)));
};

var scott = function (values, min, max) {
  return Math.ceil((max - min) / (3.5 * deviation(values) * Math.pow(values.length, -1 / 3)));
};

var max = function (array, f) {
  var i = -1,
      n = array.length,
      a,
      b;

  if (f == null) {
    while (++i < n) {
      if ((b = array[i]) != null && b >= b) {
        a = b;break;
      }
    }while (++i < n) {
      if ((b = array[i]) != null && b > a) a = b;
    }
  } else {
    while (++i < n) {
      if ((b = f(array[i], i, array)) != null && b >= b) {
        a = b;break;
      }
    }while (++i < n) {
      if ((b = f(array[i], i, array)) != null && b > a) a = b;
    }
  }

  return a;
};

var mean = function (array, f) {
  var s = 0,
      n = array.length,
      a,
      i = -1,
      j = n;

  if (f == null) {
    while (++i < n) {
      if (!isNaN(a = number(array[i]))) s += a;else --j;
    }
  } else {
    while (++i < n) {
      if (!isNaN(a = number(f(array[i], i, array)))) s += a;else --j;
    }
  }

  if (j) return s / j;
};

var median = function (array, f) {
  var numbers = [],
      n = array.length,
      a,
      i = -1;

  if (f == null) {
    while (++i < n) {
      if (!isNaN(a = number(array[i]))) numbers.push(a);
    }
  } else {
    while (++i < n) {
      if (!isNaN(a = number(f(array[i], i, array)))) numbers.push(a);
    }
  }

  return threshold(numbers.sort(ascending), 0.5);
};

var merge = function (arrays) {
  var n = arrays.length,
      m,
      i = -1,
      j = 0,
      merged,
      array;

  while (++i < n) {
    j += arrays[i].length;
  }merged = new Array(j);

  while (--n >= 0) {
    array = arrays[n];
    m = array.length;
    while (--m >= 0) {
      merged[--j] = array[m];
    }
  }

  return merged;
};

var min = function (array, f) {
  var i = -1,
      n = array.length,
      a,
      b;

  if (f == null) {
    while (++i < n) {
      if ((b = array[i]) != null && b >= b) {
        a = b;break;
      }
    }while (++i < n) {
      if ((b = array[i]) != null && a > b) a = b;
    }
  } else {
    while (++i < n) {
      if ((b = f(array[i], i, array)) != null && b >= b) {
        a = b;break;
      }
    }while (++i < n) {
      if ((b = f(array[i], i, array)) != null && a > b) a = b;
    }
  }

  return a;
};

var pairs = function (array) {
  var i = 0,
      n = array.length - 1,
      p = array[0],
      pairs = new Array(n < 0 ? 0 : n);
  while (i < n) {
    pairs[i] = [p, p = array[++i]];
  }return pairs;
};

var permute = function (array, indexes) {
  var i = indexes.length,
      permutes = new Array(i);
  while (i--) {
    permutes[i] = array[indexes[i]];
  }return permutes;
};

var scan = function (array, compare) {
    if (!(n = array.length)) return;
    var i = 0,
        n,
        j = 0,
        xi,
        xj = array[j];

    if (!compare) compare = ascending;

    while (++i < n) {
        if (compare(xi = array[i], xj) < 0 || compare(xj, xj) !== 0) xj = xi, j = i;
    }if (compare(xj, xj) === 0) return j;
};

var shuffle = function (array, i0, i1) {
  var m = (i1 == null ? array.length : i1) - (i0 = i0 == null ? 0 : +i0),
      t,
      i;

  while (m) {
    i = Math.random() * m-- | 0;
    t = array[m + i0];
    array[m + i0] = array[i + i0];
    array[i + i0] = t;
  }

  return array;
};

var sum = function (array, f) {
  var s = 0,
      n = array.length,
      a,
      i = -1;

  if (f == null) {
    while (++i < n) {
      if (a = +array[i]) s += a;
    } // Note: zero and null are equivalent.
  } else {
    while (++i < n) {
      if (a = +f(array[i], i, array)) s += a;
    }
  }

  return s;
};

var transpose = function (matrix) {
  if (!(n = matrix.length)) return [];
  for (var i = -1, m = min(matrix, length), transpose = new Array(m); ++i < m;) {
    for (var j = -1, n, row = transpose[i] = new Array(n); ++j < n;) {
      row[j] = matrix[j][i];
    }
  }
  return transpose;
};

function length(d) {
  return d.length;
}

var zip = function () {
  return transpose(arguments);
};

var prefix = "$";

function Map() {}

Map.prototype = map$1.prototype = {
  constructor: Map,
  has: function has(key) {
    return prefix + key in this;
  },
  get: function get(key) {
    return this[prefix + key];
  },
  set: function set(key, value) {
    this[prefix + key] = value;
    return this;
  },
  remove: function remove(key) {
    var property = prefix + key;
    return property in this && delete this[property];
  },
  clear: function clear() {
    for (var property in this) {
      if (property[0] === prefix) delete this[property];
    }
  },
  keys: function keys() {
    var keys = [];
    for (var property in this) {
      if (property[0] === prefix) keys.push(property.slice(1));
    }return keys;
  },
  values: function values() {
    var values = [];
    for (var property in this) {
      if (property[0] === prefix) values.push(this[property]);
    }return values;
  },
  entries: function entries() {
    var entries = [];
    for (var property in this) {
      if (property[0] === prefix) entries.push({ key: property.slice(1), value: this[property] });
    }return entries;
  },
  size: function size() {
    var size = 0;
    for (var property in this) {
      if (property[0] === prefix) ++size;
    }return size;
  },
  empty: function empty() {
    for (var property in this) {
      if (property[0] === prefix) return false;
    }return true;
  },
  each: function each(f) {
    for (var property in this) {
      if (property[0] === prefix) f(this[property], property.slice(1), this);
    }
  }
};

function map$1(object, f) {
  var map = new Map();

  // Copy constructor.
  if (object instanceof Map) object.each(function (value, key) {
    map.set(key, value);
  });

  // Index array by numeric index or specified key function.
  else if (Array.isArray(object)) {
      var i = -1,
          n = object.length,
          o;

      if (f == null) while (++i < n) {
        map.set(i, object[i]);
      } else while (++i < n) {
        map.set(f(o = object[i], i, object), o);
      }
    }

    // Convert object to map.
    else if (object) for (var key in object) {
        map.set(key, object[key]);
      }return map;
}

var nest = function () {
  var keys = [],
      _sortKeys = [],
      _sortValues,
      _rollup,
      nest;

  function apply(array, depth, createResult, setResult) {
    if (depth >= keys.length) return _rollup != null ? _rollup(array) : _sortValues != null ? array.sort(_sortValues) : array;

    var i = -1,
        n = array.length,
        key = keys[depth++],
        keyValue,
        value,
        valuesByKey = map$1(),
        values,
        result = createResult();

    while (++i < n) {
      if (values = valuesByKey.get(keyValue = key(value = array[i]) + "")) {
        values.push(value);
      } else {
        valuesByKey.set(keyValue, [value]);
      }
    }

    valuesByKey.each(function (values, key) {
      setResult(result, key, apply(values, depth, createResult, setResult));
    });

    return result;
  }

  function _entries(map, depth) {
    if (++depth > keys.length) return map;
    var array,
        sortKey = _sortKeys[depth - 1];
    if (_rollup != null && depth >= keys.length) array = map.entries();else array = [], map.each(function (v, k) {
      array.push({ key: k, values: _entries(v, depth) });
    });
    return sortKey != null ? array.sort(function (a, b) {
      return sortKey(a.key, b.key);
    }) : array;
  }

  return nest = {
    object: function object(array) {
      return apply(array, 0, createObject, setObject);
    },
    map: function map$1(array) {
      return apply(array, 0, createMap, setMap);
    },
    entries: function entries(array) {
      return _entries(apply(array, 0, createMap, setMap), 0);
    },
    key: function key(d) {
      keys.push(d);return nest;
    },
    sortKeys: function sortKeys(order) {
      _sortKeys[keys.length - 1] = order;return nest;
    },
    sortValues: function sortValues(order) {
      _sortValues = order;return nest;
    },
    rollup: function rollup(f) {
      _rollup = f;return nest;
    }
  };
};

function createObject() {
  return {};
}

function setObject(object, key, value) {
  object[key] = value;
}

function createMap() {
  return map$1();
}

function setMap(map, key, value) {
  map.set(key, value);
}

function Set() {}

var proto = map$1.prototype;

Set.prototype = set$1.prototype = {
  constructor: Set,
  has: proto.has,
  add: function add(value) {
    value += "";
    this[prefix + value] = value;
    return this;
  },
  remove: proto.remove,
  clear: proto.clear,
  values: proto.keys,
  size: proto.size,
  empty: proto.empty,
  each: proto.each
};

function set$1(object, f) {
  var set = new Set();

  // Copy constructor.
  if (object instanceof Set) object.each(function (value) {
    set.add(value);
  });

  // Otherwise, assume it’s an array.
  else if (object) {
      var i = -1,
          n = object.length;
      if (f == null) while (++i < n) {
        set.add(object[i]);
      } else while (++i < n) {
        set.add(f(object[i], i, object));
      }
    }

  return set;
}

var keys$1 = function (map) {
  var keys = [];
  for (var key in map) {
    keys.push(key);
  }return keys;
};

var values$1 = function (map) {
  var values = [];
  for (var key in map) {
    values.push(map[key]);
  }return values;
};

var entries$1 = function (map) {
  var entries = [];
  for (var key in map) {
    entries.push({ key: key, value: map[key] });
  }return entries;
};

var uniform = function (min, max) {
  min = min == null ? 0 : +min;
  max = max == null ? 1 : +max;
  if (arguments.length === 1) max = min, min = 0;else max -= min;
  return function () {
    return Math.random() * max + min;
  };
};

var normal = function (mu, sigma) {
  var x, r;
  mu = mu == null ? 0 : +mu;
  sigma = sigma == null ? 1 : +sigma;
  return function () {
    var y;

    // If available, use the second previously-generated uniform random.
    if (x != null) y = x, x = null;

    // Otherwise, generate a new x and y.
    else do {
        x = Math.random() * 2 - 1;
        y = Math.random() * 2 - 1;
        r = x * x + y * y;
      } while (!r || r > 1);

    return mu + sigma * y * Math.sqrt(-2 * Math.log(r) / r);
  };
};

var logNormal = function () {
  var randomNormal = normal.apply(this, arguments);
  return function () {
    return Math.exp(randomNormal());
  };
};

var irwinHall = function (n) {
  return function () {
    for (var sum = 0, i = 0; i < n; ++i) {
      sum += Math.random();
    }return sum;
  };
};

var bates = function (n) {
  var randomIrwinHall = irwinHall(n);
  return function () {
    return randomIrwinHall() / n;
  };
};

var exponential = function (lambda) {
  return function () {
    return -Math.log(1 - Math.random()) / lambda;
  };
};

function linear(t) {
  return +t;
}

function quadIn(t) {
  return t * t;
}

function quadOut(t) {
  return t * (2 - t);
}

function quadInOut(t) {
  return ((t *= 2) <= 1 ? t * t : --t * (2 - t) + 1) / 2;
}

function cubicIn(t) {
  return t * t * t;
}

function cubicOut(t) {
  return --t * t * t + 1;
}

function cubicInOut(t) {
  return ((t *= 2) <= 1 ? t * t * t : (t -= 2) * t * t + 2) / 2;
}

var exponent = 3;

var polyIn = function custom(e) {
  e = +e;

  function polyIn(t) {
    return Math.pow(t, e);
  }

  polyIn.exponent = custom;

  return polyIn;
}(exponent);

var polyOut = function custom(e) {
  e = +e;

  function polyOut(t) {
    return 1 - Math.pow(1 - t, e);
  }

  polyOut.exponent = custom;

  return polyOut;
}(exponent);

var polyInOut = function custom(e) {
  e = +e;

  function polyInOut(t) {
    return ((t *= 2) <= 1 ? Math.pow(t, e) : 2 - Math.pow(2 - t, e)) / 2;
  }

  polyInOut.exponent = custom;

  return polyInOut;
}(exponent);

var pi = Math.PI;
var halfPi = pi / 2;

function sinIn(t) {
  return 1 - Math.cos(t * halfPi);
}

function sinOut(t) {
  return Math.sin(t * halfPi);
}

function sinInOut(t) {
  return (1 - Math.cos(pi * t)) / 2;
}

function expIn(t) {
  return Math.pow(2, 10 * t - 10);
}

function expOut(t) {
  return 1 - Math.pow(2, -10 * t);
}

function expInOut(t) {
  return ((t *= 2) <= 1 ? Math.pow(2, 10 * t - 10) : 2 - Math.pow(2, 10 - 10 * t)) / 2;
}

function circleIn(t) {
  return 1 - Math.sqrt(1 - t * t);
}

function circleOut(t) {
  return Math.sqrt(1 - --t * t);
}

function circleInOut(t) {
  return ((t *= 2) <= 1 ? 1 - Math.sqrt(1 - t * t) : Math.sqrt(1 - (t -= 2) * t) + 1) / 2;
}

var b1 = 4 / 11;
var b2 = 6 / 11;
var b3 = 8 / 11;
var b4 = 3 / 4;
var b5 = 9 / 11;
var b6 = 10 / 11;
var b7 = 15 / 16;
var b8 = 21 / 22;
var b9 = 63 / 64;
var b0 = 1 / b1 / b1;

function bounceIn(t) {
  return 1 - bounceOut(1 - t);
}

function bounceOut(t) {
  return (t = +t) < b1 ? b0 * t * t : t < b3 ? b0 * (t -= b2) * t + b4 : t < b6 ? b0 * (t -= b5) * t + b7 : b0 * (t -= b8) * t + b9;
}

function bounceInOut(t) {
  return ((t *= 2) <= 1 ? 1 - bounceOut(1 - t) : bounceOut(t - 1) + 1) / 2;
}

var overshoot = 1.70158;

var backIn = function custom(s) {
  s = +s;

  function backIn(t) {
    return t * t * ((s + 1) * t - s);
  }

  backIn.overshoot = custom;

  return backIn;
}(overshoot);

var backOut = function custom(s) {
  s = +s;

  function backOut(t) {
    return --t * t * ((s + 1) * t + s) + 1;
  }

  backOut.overshoot = custom;

  return backOut;
}(overshoot);

var backInOut = function custom(s) {
  s = +s;

  function backInOut(t) {
    return ((t *= 2) < 1 ? t * t * ((s + 1) * t - s) : (t -= 2) * t * ((s + 1) * t + s) + 2) / 2;
  }

  backInOut.overshoot = custom;

  return backInOut;
}(overshoot);

var tau = 2 * Math.PI;
var amplitude = 1;
var period = 0.3;

var elasticIn = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticIn(t) {
    return a * Math.pow(2, 10 * --t) * Math.sin((s - t) / p);
  }

  elasticIn.amplitude = function (a) {
    return custom(a, p * tau);
  };
  elasticIn.period = function (p) {
    return custom(a, p);
  };

  return elasticIn;
}(amplitude, period);

var elasticOut = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticOut(t) {
    return 1 - a * Math.pow(2, -10 * (t = +t)) * Math.sin((t + s) / p);
  }

  elasticOut.amplitude = function (a) {
    return custom(a, p * tau);
  };
  elasticOut.period = function (p) {
    return custom(a, p);
  };

  return elasticOut;
}(amplitude, period);

var elasticInOut = function custom(a, p) {
  var s = Math.asin(1 / (a = Math.max(1, a))) * (p /= tau);

  function elasticInOut(t) {
    return ((t = t * 2 - 1) < 0 ? a * Math.pow(2, 10 * t) * Math.sin((s - t) / p) : 2 - a * Math.pow(2, -10 * t) * Math.sin((s + t) / p)) / 2;
  }

  elasticInOut.amplitude = function (a) {
    return custom(a, p * tau);
  };
  elasticInOut.period = function (p) {
    return custom(a, p);
  };

  return elasticInOut;
}(amplitude, period);

var area = function (polygon) {
  var i = -1,
      n = polygon.length,
      a,
      b = polygon[n - 1],
      area = 0;

  while (++i < n) {
    a = b;
    b = polygon[i];
    area += a[1] * b[0] - a[0] * b[1];
  }

  return area / 2;
};

var centroid = function (polygon) {
  var i = -1,
      n = polygon.length,
      x = 0,
      y = 0,
      a,
      b = polygon[n - 1],
      c,
      k = 0;

  while (++i < n) {
    a = b;
    b = polygon[i];
    k += c = a[0] * b[1] - b[0] * a[1];
    x += (a[0] + b[0]) * c;
    y += (a[1] + b[1]) * c;
  }

  return k *= 3, [x / k, y / k];
};

// Returns the 2D cross product of AB and AC vectors, i.e., the z-component of
// the 3D cross product in a quadrant I Cartesian coordinate system (+x is
// right, +y is up). Returns a positive value if ABC is counter-clockwise,
// negative if clockwise, and zero if the points are collinear.
var cross = function (a, b, c) {
  return (b[0] - a[0]) * (c[1] - a[1]) - (b[1] - a[1]) * (c[0] - a[0]);
};

function lexicographicOrder(a, b) {
    return a[0] - b[0] || a[1] - b[1];
}

// Computes the upper convex hull per the monotone chain algorithm.
// Assumes points.length >= 3, is sorted by x, unique in y.
// Returns an array of indices into points in left-to-right order.
function computeUpperHullIndexes(points) {
    var n = points.length,
        indexes = [0, 1],
        size = 2;

    for (var i = 2; i < n; ++i) {
        while (size > 1 && cross(points[indexes[size - 2]], points[indexes[size - 1]], points[i]) <= 0) {
            --size;
        }indexes[size++] = i;
    }

    return indexes.slice(0, size); // remove popped points
}

var hull = function (points) {
    if ((n = points.length) < 3) return null;

    var i,
        n,
        sortedPoints = new Array(n),
        flippedPoints = new Array(n);

    for (i = 0; i < n; ++i) {
        sortedPoints[i] = [+points[i][0], +points[i][1], i];
    }sortedPoints.sort(lexicographicOrder);
    for (i = 0; i < n; ++i) {
        flippedPoints[i] = [sortedPoints[i][0], -sortedPoints[i][1]];
    }var upperIndexes = computeUpperHullIndexes(sortedPoints),
        lowerIndexes = computeUpperHullIndexes(flippedPoints);

    // Construct the hull polygon, removing possible duplicate endpoints.
    var skipLeft = lowerIndexes[0] === upperIndexes[0],
        skipRight = lowerIndexes[lowerIndexes.length - 1] === upperIndexes[upperIndexes.length - 1],
        hull = [];

    // Add upper hull in right-to-l order.
    // Then add lower hull in left-to-right order.
    for (i = upperIndexes.length - 1; i >= 0; --i) {
        hull.push(points[sortedPoints[upperIndexes[i]][2]]);
    }for (i = +skipLeft; i < lowerIndexes.length - skipRight; ++i) {
        hull.push(points[sortedPoints[lowerIndexes[i]][2]]);
    }return hull;
};

var contains$1 = function (polygon, point) {
  var n = polygon.length,
      p = polygon[n - 1],
      x = point[0],
      y = point[1],
      x0 = p[0],
      y0 = p[1],
      x1,
      y1,
      inside = false;

  for (var i = 0; i < n; ++i) {
    p = polygon[i], x1 = p[0], y1 = p[1];
    if (y1 > y !== y0 > y && x < (x0 - x1) * (y - y1) / (y0 - y1) + x1) inside = !inside;
    x0 = x1, y0 = y1;
  }

  return inside;
};

var length$1 = function (polygon) {
  var i = -1,
      n = polygon.length,
      b = polygon[n - 1],
      xa,
      ya,
      xb = b[0],
      yb = b[1],
      perimeter = 0;

  while (++i < n) {
    xa = xb;
    ya = yb;
    b = polygon[i];
    xb = b[0];
    yb = b[1];
    xa -= xb;
    ya -= yb;
    perimeter += Math.sqrt(xa * xa + ya * ya);
  }

  return perimeter;
};

var pi$1 = Math.PI;
var tau$1 = 2 * pi$1;
var epsilon = 1e-6;
var tauEpsilon = tau$1 - epsilon;

function Path() {
  this._x0 = this._y0 = // start of current subpath
  this._x1 = this._y1 = null; // end of current subpath
  this._ = "";
}

function path() {
  return new Path();
}

Path.prototype = path.prototype = {
  constructor: Path,
  moveTo: function moveTo(x, y) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y);
  },
  closePath: function closePath() {
    if (this._x1 !== null) {
      this._x1 = this._x0, this._y1 = this._y0;
      this._ += "Z";
    }
  },
  lineTo: function lineTo(x, y) {
    this._ += "L" + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  quadraticCurveTo: function quadraticCurveTo(x1, y1, x, y) {
    this._ += "Q" + +x1 + "," + +y1 + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  bezierCurveTo: function bezierCurveTo(x1, y1, x2, y2, x, y) {
    this._ += "C" + +x1 + "," + +y1 + "," + +x2 + "," + +y2 + "," + (this._x1 = +x) + "," + (this._y1 = +y);
  },
  arcTo: function arcTo(x1, y1, x2, y2, r) {
    x1 = +x1, y1 = +y1, x2 = +x2, y2 = +y2, r = +r;
    var x0 = this._x1,
        y0 = this._y1,
        x21 = x2 - x1,
        y21 = y2 - y1,
        x01 = x0 - x1,
        y01 = y0 - y1,
        l01_2 = x01 * x01 + y01 * y01;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x1,y1).
    if (this._x1 === null) {
      this._ += "M" + (this._x1 = x1) + "," + (this._y1 = y1);
    }

    // Or, is (x1,y1) coincident with (x0,y0)? Do nothing.
    else if (!(l01_2 > epsilon)) {}

      // Or, are (x0,y0), (x1,y1) and (x2,y2) collinear?
      // Equivalently, is (x1,y1) coincident with (x2,y2)?
      // Or, is the radius zero? Line to (x1,y1).
      else if (!(Math.abs(y01 * x21 - y21 * x01) > epsilon) || !r) {
          this._ += "L" + (this._x1 = x1) + "," + (this._y1 = y1);
        }

        // Otherwise, draw an arc!
        else {
            var x20 = x2 - x0,
                y20 = y2 - y0,
                l21_2 = x21 * x21 + y21 * y21,
                l20_2 = x20 * x20 + y20 * y20,
                l21 = Math.sqrt(l21_2),
                l01 = Math.sqrt(l01_2),
                l = r * Math.tan((pi$1 - Math.acos((l21_2 + l01_2 - l20_2) / (2 * l21 * l01))) / 2),
                t01 = l / l01,
                t21 = l / l21;

            // If the start tangent is not coincident with (x0,y0), line to.
            if (Math.abs(t01 - 1) > epsilon) {
              this._ += "L" + (x1 + t01 * x01) + "," + (y1 + t01 * y01);
            }

            this._ += "A" + r + "," + r + ",0,0," + +(y01 * x20 > x01 * y20) + "," + (this._x1 = x1 + t21 * x21) + "," + (this._y1 = y1 + t21 * y21);
          }
  },
  arc: function arc(x, y, r, a0, a1, ccw) {
    x = +x, y = +y, r = +r;
    var dx = r * Math.cos(a0),
        dy = r * Math.sin(a0),
        x0 = x + dx,
        y0 = y + dy,
        cw = 1 ^ ccw,
        da = ccw ? a0 - a1 : a1 - a0;

    // Is the radius negative? Error.
    if (r < 0) throw new Error("negative radius: " + r);

    // Is this path empty? Move to (x0,y0).
    if (this._x1 === null) {
      this._ += "M" + x0 + "," + y0;
    }

    // Or, is (x0,y0) not coincident with the previous point? Line to (x0,y0).
    else if (Math.abs(this._x1 - x0) > epsilon || Math.abs(this._y1 - y0) > epsilon) {
        this._ += "L" + x0 + "," + y0;
      }

    // Is this arc empty? We’re done.
    if (!r) return;

    // Is this a complete circle? Draw two arcs to complete the circle.
    if (da > tauEpsilon) {
      this._ += "A" + r + "," + r + ",0,1," + cw + "," + (x - dx) + "," + (y - dy) + "A" + r + "," + r + ",0,1," + cw + "," + (this._x1 = x0) + "," + (this._y1 = y0);
    }

    // Otherwise, draw an arc!
    else {
        if (da < 0) da = da % tau$1 + tau$1;
        this._ += "A" + r + "," + r + ",0," + +(da >= pi$1) + "," + cw + "," + (this._x1 = x + r * Math.cos(a1)) + "," + (this._y1 = y + r * Math.sin(a1));
      }
  },
  rect: function rect(x, y, w, h) {
    this._ += "M" + (this._x0 = this._x1 = +x) + "," + (this._y0 = this._y1 = +y) + "h" + +w + "v" + +h + "h" + -w + "Z";
  },
  toString: function toString() {
    return this._;
  }
};

var tree_add = function (d) {
  var x = +this._x.call(null, d),
      y = +this._y.call(null, d);
  return add$1(this.cover(x, y), x, y, d);
};

function add$1(tree, x, y, d) {
  if (isNaN(x) || isNaN(y)) return tree; // ignore invalid points

  var parent,
      node = tree._root,
      leaf = { data: d },
      x0 = tree._x0,
      y0 = tree._y0,
      x1 = tree._x1,
      y1 = tree._y1,
      xm,
      ym,
      xp,
      yp,
      right,
      bottom,
      i,
      j;

  // If the tree is empty, initialize the root as a leaf.
  if (!node) return tree._root = leaf, tree;

  // Find the existing leaf for the new point, or add it.
  while (node.length) {
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm;else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym;else y1 = ym;
    if (parent = node, !(node = node[i = bottom << 1 | right])) return parent[i] = leaf, tree;
  }

  // Is the new point is exactly coincident with the existing point?
  xp = +tree._x.call(null, node.data);
  yp = +tree._y.call(null, node.data);
  if (x === xp && y === yp) return leaf.next = node, parent ? parent[i] = leaf : tree._root = leaf, tree;

  // Otherwise, split the leaf node until the old and new point are separated.
  do {
    parent = parent ? parent[i] = new Array(4) : tree._root = new Array(4);
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm;else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym;else y1 = ym;
  } while ((i = bottom << 1 | right) === (j = (yp >= ym) << 1 | xp >= xm));
  return parent[j] = node, parent[i] = leaf, tree;
}

function addAll(data) {
  var d,
      i,
      n = data.length,
      x,
      y,
      xz = new Array(n),
      yz = new Array(n),
      x0 = Infinity,
      y0 = Infinity,
      x1 = -Infinity,
      y1 = -Infinity;

  // Compute the points and their extent.
  for (i = 0; i < n; ++i) {
    if (isNaN(x = +this._x.call(null, d = data[i])) || isNaN(y = +this._y.call(null, d))) continue;
    xz[i] = x;
    yz[i] = y;
    if (x < x0) x0 = x;
    if (x > x1) x1 = x;
    if (y < y0) y0 = y;
    if (y > y1) y1 = y;
  }

  // If there were no (valid) points, inherit the existing extent.
  if (x1 < x0) x0 = this._x0, x1 = this._x1;
  if (y1 < y0) y0 = this._y0, y1 = this._y1;

  // Expand the tree to cover the new points.
  this.cover(x0, y0).cover(x1, y1);

  // Add the new points.
  for (i = 0; i < n; ++i) {
    add$1(this, xz[i], yz[i], data[i]);
  }

  return this;
}

var tree_cover = function (x, y) {
  if (isNaN(x = +x) || isNaN(y = +y)) return this; // ignore invalid points

  var x0 = this._x0,
      y0 = this._y0,
      x1 = this._x1,
      y1 = this._y1;

  // If the quadtree has no extent, initialize them.
  // Integer extent are necessary so that if we later double the extent,
  // the existing quadrant boundaries don’t change due to floating point error!
  if (isNaN(x0)) {
    x1 = (x0 = Math.floor(x)) + 1;
    y1 = (y0 = Math.floor(y)) + 1;
  }

  // Otherwise, double repeatedly to cover.
  else if (x0 > x || x > x1 || y0 > y || y > y1) {
      var z = x1 - x0,
          node = this._root,
          parent,
          i;

      switch (i = (y < (y0 + y1) / 2) << 1 | x < (x0 + x1) / 2) {
        case 0:
          {
            do {
              parent = new Array(4), parent[i] = node, node = parent;
            } while ((z *= 2, x1 = x0 + z, y1 = y0 + z, x > x1 || y > y1));
            break;
          }
        case 1:
          {
            do {
              parent = new Array(4), parent[i] = node, node = parent;
            } while ((z *= 2, x0 = x1 - z, y1 = y0 + z, x0 > x || y > y1));
            break;
          }
        case 2:
          {
            do {
              parent = new Array(4), parent[i] = node, node = parent;
            } while ((z *= 2, x1 = x0 + z, y0 = y1 - z, x > x1 || y0 > y));
            break;
          }
        case 3:
          {
            do {
              parent = new Array(4), parent[i] = node, node = parent;
            } while ((z *= 2, x0 = x1 - z, y0 = y1 - z, x0 > x || y0 > y));
            break;
          }
      }

      if (this._root && this._root.length) this._root = node;
    }

    // If the quadtree covers the point already, just return.
    else return this;

  this._x0 = x0;
  this._y0 = y0;
  this._x1 = x1;
  this._y1 = y1;
  return this;
};

var tree_data = function () {
  var data = [];
  this.visit(function (node) {
    if (!node.length) do {
      data.push(node.data);
    } while (node = node.next);
  });
  return data;
};

var tree_extent = function (_) {
    return arguments.length ? this.cover(+_[0][0], +_[0][1]).cover(+_[1][0], +_[1][1]) : isNaN(this._x0) ? undefined : [[this._x0, this._y0], [this._x1, this._y1]];
};

var Quad = function (node, x0, y0, x1, y1) {
  this.node = node;
  this.x0 = x0;
  this.y0 = y0;
  this.x1 = x1;
  this.y1 = y1;
};

var tree_find = function (x, y, radius) {
  var data,
      x0 = this._x0,
      y0 = this._y0,
      x1,
      y1,
      x2,
      y2,
      x3 = this._x1,
      y3 = this._y1,
      quads = [],
      node = this._root,
      q,
      i;

  if (node) quads.push(new Quad(node, x0, y0, x3, y3));
  if (radius == null) radius = Infinity;else {
    x0 = x - radius, y0 = y - radius;
    x3 = x + radius, y3 = y + radius;
    radius *= radius;
  }

  while (q = quads.pop()) {

    // Stop searching if this quadrant can’t contain a closer node.
    if (!(node = q.node) || (x1 = q.x0) > x3 || (y1 = q.y0) > y3 || (x2 = q.x1) < x0 || (y2 = q.y1) < y0) continue;

    // Bisect the current quadrant.
    if (node.length) {
      var xm = (x1 + x2) / 2,
          ym = (y1 + y2) / 2;

      quads.push(new Quad(node[3], xm, ym, x2, y2), new Quad(node[2], x1, ym, xm, y2), new Quad(node[1], xm, y1, x2, ym), new Quad(node[0], x1, y1, xm, ym));

      // Visit the closest quadrant first.
      if (i = (y >= ym) << 1 | x >= xm) {
        q = quads[quads.length - 1];
        quads[quads.length - 1] = quads[quads.length - 1 - i];
        quads[quads.length - 1 - i] = q;
      }
    }

    // Visit this point. (Visiting coincident points isn’t necessary!)
    else {
        var dx = x - +this._x.call(null, node.data),
            dy = y - +this._y.call(null, node.data),
            d2 = dx * dx + dy * dy;
        if (d2 < radius) {
          var d = Math.sqrt(radius = d2);
          x0 = x - d, y0 = y - d;
          x3 = x + d, y3 = y + d;
          data = node.data;
        }
      }
  }

  return data;
};

var tree_remove = function (d) {
  if (isNaN(x = +this._x.call(null, d)) || isNaN(y = +this._y.call(null, d))) return this; // ignore invalid points

  var parent,
      node = this._root,
      retainer,
      previous,
      next,
      x0 = this._x0,
      y0 = this._y0,
      x1 = this._x1,
      y1 = this._y1,
      x,
      y,
      xm,
      ym,
      right,
      bottom,
      i,
      j;

  // If the tree is empty, initialize the root as a leaf.
  if (!node) return this;

  // Find the leaf node for the point.
  // While descending, also retain the deepest parent with a non-removed sibling.
  if (node.length) while (true) {
    if (right = x >= (xm = (x0 + x1) / 2)) x0 = xm;else x1 = xm;
    if (bottom = y >= (ym = (y0 + y1) / 2)) y0 = ym;else y1 = ym;
    if (!(parent = node, node = node[i = bottom << 1 | right])) return this;
    if (!node.length) break;
    if (parent[i + 1 & 3] || parent[i + 2 & 3] || parent[i + 3 & 3]) retainer = parent, j = i;
  }

  // Find the point to remove.
  while (node.data !== d) {
    if (!(previous = node, node = node.next)) return this;
  }if (next = node.next) delete node.next;

  // If there are multiple coincident points, remove just the point.
  if (previous) return next ? previous.next = next : delete previous.next, this;

  // If this is the root point, remove it.
  if (!parent) return this._root = next, this;

  // Remove this leaf.
  next ? parent[i] = next : delete parent[i];

  // If the parent now contains exactly one leaf, collapse superfluous parents.
  if ((node = parent[0] || parent[1] || parent[2] || parent[3]) && node === (parent[3] || parent[2] || parent[1] || parent[0]) && !node.length) {
    if (retainer) retainer[j] = node;else this._root = node;
  }

  return this;
};

function removeAll(data) {
  for (var i = 0, n = data.length; i < n; ++i) {
    this.remove(data[i]);
  }return this;
}

var tree_root = function () {
  return this._root;
};

var tree_size = function () {
  var size = 0;
  this.visit(function (node) {
    if (!node.length) do {
      ++size;
    } while (node = node.next);
  });
  return size;
};

var tree_visit = function (callback) {
  var quads = [],
      q,
      node = this._root,
      child,
      x0,
      y0,
      x1,
      y1;
  if (node) quads.push(new Quad(node, this._x0, this._y0, this._x1, this._y1));
  while (q = quads.pop()) {
    if (!callback(node = q.node, x0 = q.x0, y0 = q.y0, x1 = q.x1, y1 = q.y1) && node.length) {
      var xm = (x0 + x1) / 2,
          ym = (y0 + y1) / 2;
      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
    }
  }
  return this;
};

var tree_visitAfter = function (callback) {
  var quads = [],
      next = [],
      q;
  if (this._root) quads.push(new Quad(this._root, this._x0, this._y0, this._x1, this._y1));
  while (q = quads.pop()) {
    var node = q.node;
    if (node.length) {
      var child,
          x0 = q.x0,
          y0 = q.y0,
          x1 = q.x1,
          y1 = q.y1,
          xm = (x0 + x1) / 2,
          ym = (y0 + y1) / 2;
      if (child = node[0]) quads.push(new Quad(child, x0, y0, xm, ym));
      if (child = node[1]) quads.push(new Quad(child, xm, y0, x1, ym));
      if (child = node[2]) quads.push(new Quad(child, x0, ym, xm, y1));
      if (child = node[3]) quads.push(new Quad(child, xm, ym, x1, y1));
    }
    next.push(q);
  }
  while (q = next.pop()) {
    callback(q.node, q.x0, q.y0, q.x1, q.y1);
  }
  return this;
};

function defaultX(d) {
  return d[0];
}

var tree_x = function (_) {
  return arguments.length ? (this._x = _, this) : this._x;
};

function defaultY(d) {
  return d[1];
}

var tree_y = function (_) {
  return arguments.length ? (this._y = _, this) : this._y;
};

function quadtree(nodes, x, y) {
  var tree = new Quadtree(x == null ? defaultX : x, y == null ? defaultY : y, NaN, NaN, NaN, NaN);
  return nodes == null ? tree : tree.addAll(nodes);
}

function Quadtree(x, y, x0, y0, x1, y1) {
  this._x = x;
  this._y = y;
  this._x0 = x0;
  this._y0 = y0;
  this._x1 = x1;
  this._y1 = y1;
  this._root = undefined;
}

function leaf_copy(leaf) {
  var copy = { data: leaf.data },
      next = copy;
  while (leaf = leaf.next) {
    next = next.next = { data: leaf.data };
  }return copy;
}

var treeProto = quadtree.prototype = Quadtree.prototype;

treeProto.copy = function () {
  var copy = new Quadtree(this._x, this._y, this._x0, this._y0, this._x1, this._y1),
      node = this._root,
      nodes,
      child;

  if (!node) return copy;

  if (!node.length) return copy._root = leaf_copy(node), copy;

  nodes = [{ source: node, target: copy._root = new Array(4) }];
  while (node = nodes.pop()) {
    for (var i = 0; i < 4; ++i) {
      if (child = node.source[i]) {
        if (child.length) nodes.push({ source: child, target: node.target[i] = new Array(4) });else node.target[i] = leaf_copy(child);
      }
    }
  }

  return copy;
};

treeProto.add = tree_add;
treeProto.addAll = addAll;
treeProto.cover = tree_cover;
treeProto.data = tree_data;
treeProto.extent = tree_extent;
treeProto.find = tree_find;
treeProto.remove = tree_remove;
treeProto.removeAll = removeAll;
treeProto.root = tree_root;
treeProto.size = tree_size;
treeProto.visit = tree_visit;
treeProto.visitAfter = tree_visitAfter;
treeProto.x = tree_x;
treeProto.y = tree_y;

var constant$2 = function (x) {
  return function constant() {
    return x;
  };
};

var epsilon$1 = 1e-12;
var pi$2 = Math.PI;
var halfPi$1 = pi$2 / 2;
var tau$2 = 2 * pi$2;

function arcInnerRadius(d) {
  return d.innerRadius;
}

function arcOuterRadius(d) {
  return d.outerRadius;
}

function arcStartAngle(d) {
  return d.startAngle;
}

function arcEndAngle(d) {
  return d.endAngle;
}

function arcPadAngle(d) {
  return d && d.padAngle; // Note: optional!
}

function asin(x) {
  return x >= 1 ? halfPi$1 : x <= -1 ? -halfPi$1 : Math.asin(x);
}

function intersect(x0, y0, x1, y1, x2, y2, x3, y3) {
  var x10 = x1 - x0,
      y10 = y1 - y0,
      x32 = x3 - x2,
      y32 = y3 - y2,
      t = (x32 * (y0 - y2) - y32 * (x0 - x2)) / (y32 * x10 - x32 * y10);
  return [x0 + t * x10, y0 + t * y10];
}

// Compute perpendicular offset line of length rc.
// http://mathworld.wolfram.com/Circle-LineIntersection.html
function cornerTangents(x0, y0, x1, y1, r1, rc, cw) {
  var x01 = x0 - x1,
      y01 = y0 - y1,
      lo = (cw ? rc : -rc) / Math.sqrt(x01 * x01 + y01 * y01),
      ox = lo * y01,
      oy = -lo * x01,
      x11 = x0 + ox,
      y11 = y0 + oy,
      x10 = x1 + ox,
      y10 = y1 + oy,
      x00 = (x11 + x10) / 2,
      y00 = (y11 + y10) / 2,
      dx = x10 - x11,
      dy = y10 - y11,
      d2 = dx * dx + dy * dy,
      r = r1 - rc,
      D = x11 * y10 - x10 * y11,
      d = (dy < 0 ? -1 : 1) * Math.sqrt(Math.max(0, r * r * d2 - D * D)),
      cx0 = (D * dy - dx * d) / d2,
      cy0 = (-D * dx - dy * d) / d2,
      cx1 = (D * dy + dx * d) / d2,
      cy1 = (-D * dx + dy * d) / d2,
      dx0 = cx0 - x00,
      dy0 = cy0 - y00,
      dx1 = cx1 - x00,
      dy1 = cy1 - y00;

  // Pick the closer of the two intersection points.
  // TODO Is there a faster way to determine which intersection to use?
  if (dx0 * dx0 + dy0 * dy0 > dx1 * dx1 + dy1 * dy1) cx0 = cx1, cy0 = cy1;

  return {
    cx: cx0,
    cy: cy0,
    x01: -ox,
    y01: -oy,
    x11: cx0 * (r1 / r - 1),
    y11: cy0 * (r1 / r - 1)
  };
}

var arc$1 = function () {
  var innerRadius = arcInnerRadius,
      outerRadius = arcOuterRadius,
      cornerRadius = constant$2(0),
      padRadius = null,
      startAngle = arcStartAngle,
      endAngle = arcEndAngle,
      padAngle = arcPadAngle,
      context = null;

  function arc() {
    var buffer,
        r,
        r0 = +innerRadius.apply(this, arguments),
        r1 = +outerRadius.apply(this, arguments),
        a0 = startAngle.apply(this, arguments) - halfPi$1,
        a1 = endAngle.apply(this, arguments) - halfPi$1,
        da = Math.abs(a1 - a0),
        cw = a1 > a0;

    if (!context) context = buffer = path();

    // Ensure that the outer radius is always larger than the inner radius.
    if (r1 < r0) r = r1, r1 = r0, r0 = r;

    // Is it a point?
    if (!(r1 > epsilon$1)) context.moveTo(0, 0);

    // Or is it a circle or annulus?
    else if (da > tau$2 - epsilon$1) {
        context.moveTo(r1 * Math.cos(a0), r1 * Math.sin(a0));
        context.arc(0, 0, r1, a0, a1, !cw);
        if (r0 > epsilon$1) {
          context.moveTo(r0 * Math.cos(a1), r0 * Math.sin(a1));
          context.arc(0, 0, r0, a1, a0, cw);
        }
      }

      // Or is it a circular or annular sector?
      else {
          var a01 = a0,
              a11 = a1,
              a00 = a0,
              a10 = a1,
              da0 = da,
              da1 = da,
              ap = padAngle.apply(this, arguments) / 2,
              rp = ap > epsilon$1 && (padRadius ? +padRadius.apply(this, arguments) : Math.sqrt(r0 * r0 + r1 * r1)),
              rc = Math.min(Math.abs(r1 - r0) / 2, +cornerRadius.apply(this, arguments)),
              rc0 = rc,
              rc1 = rc,
              t0,
              t1;

          // Apply padding? Note that since r1 ≥ r0, da1 ≥ da0.
          if (rp > epsilon$1) {
            var p0 = asin(rp / r0 * Math.sin(ap)),
                p1 = asin(rp / r1 * Math.sin(ap));
            if ((da0 -= p0 * 2) > epsilon$1) p0 *= cw ? 1 : -1, a00 += p0, a10 -= p0;else da0 = 0, a00 = a10 = (a0 + a1) / 2;
            if ((da1 -= p1 * 2) > epsilon$1) p1 *= cw ? 1 : -1, a01 += p1, a11 -= p1;else da1 = 0, a01 = a11 = (a0 + a1) / 2;
          }

          var x01 = r1 * Math.cos(a01),
              y01 = r1 * Math.sin(a01),
              x10 = r0 * Math.cos(a10),
              y10 = r0 * Math.sin(a10);

          // Apply rounded corners?
          if (rc > epsilon$1) {
            var x11 = r1 * Math.cos(a11),
                y11 = r1 * Math.sin(a11),
                x00 = r0 * Math.cos(a00),
                y00 = r0 * Math.sin(a00);

            // Restrict the corner radius according to the sector angle.
            if (da < pi$2) {
              var oc = da0 > epsilon$1 ? intersect(x01, y01, x00, y00, x11, y11, x10, y10) : [x10, y10],
                  ax = x01 - oc[0],
                  ay = y01 - oc[1],
                  bx = x11 - oc[0],
                  by = y11 - oc[1],
                  kc = 1 / Math.sin(Math.acos((ax * bx + ay * by) / (Math.sqrt(ax * ax + ay * ay) * Math.sqrt(bx * bx + by * by))) / 2),
                  lc = Math.sqrt(oc[0] * oc[0] + oc[1] * oc[1]);
              rc0 = Math.min(rc, (r0 - lc) / (kc - 1));
              rc1 = Math.min(rc, (r1 - lc) / (kc + 1));
            }
          }

          // Is the sector collapsed to a line?
          if (!(da1 > epsilon$1)) context.moveTo(x01, y01);

          // Does the sector’s outer ring have rounded corners?
          else if (rc1 > epsilon$1) {
              t0 = cornerTangents(x00, y00, x01, y01, r1, rc1, cw);
              t1 = cornerTangents(x11, y11, x10, y10, r1, rc1, cw);

              context.moveTo(t0.cx + t0.x01, t0.cy + t0.y01);

              // Have the corners merged?
              if (rc1 < rc) context.arc(t0.cx, t0.cy, rc1, Math.atan2(t0.y01, t0.x01), Math.atan2(t1.y01, t1.x01), !cw);

              // Otherwise, draw the two corners and the ring.
              else {
                  context.arc(t0.cx, t0.cy, rc1, Math.atan2(t0.y01, t0.x01), Math.atan2(t0.y11, t0.x11), !cw);
                  context.arc(0, 0, r1, Math.atan2(t0.cy + t0.y11, t0.cx + t0.x11), Math.atan2(t1.cy + t1.y11, t1.cx + t1.x11), !cw);
                  context.arc(t1.cx, t1.cy, rc1, Math.atan2(t1.y11, t1.x11), Math.atan2(t1.y01, t1.x01), !cw);
                }
            }

            // Or is the outer ring just a circular arc?
            else context.moveTo(x01, y01), context.arc(0, 0, r1, a01, a11, !cw);

          // Is there no inner ring, and it’s a circular sector?
          // Or perhaps it’s an annular sector collapsed due to padding?
          if (!(r0 > epsilon$1) || !(da0 > epsilon$1)) context.lineTo(x10, y10);

          // Does the sector’s inner ring (or point) have rounded corners?
          else if (rc0 > epsilon$1) {
              t0 = cornerTangents(x10, y10, x11, y11, r0, -rc0, cw);
              t1 = cornerTangents(x01, y01, x00, y00, r0, -rc0, cw);

              context.lineTo(t0.cx + t0.x01, t0.cy + t0.y01);

              // Have the corners merged?
              if (rc0 < rc) context.arc(t0.cx, t0.cy, rc0, Math.atan2(t0.y01, t0.x01), Math.atan2(t1.y01, t1.x01), !cw);

              // Otherwise, draw the two corners and the ring.
              else {
                  context.arc(t0.cx, t0.cy, rc0, Math.atan2(t0.y01, t0.x01), Math.atan2(t0.y11, t0.x11), !cw);
                  context.arc(0, 0, r0, Math.atan2(t0.cy + t0.y11, t0.cx + t0.x11), Math.atan2(t1.cy + t1.y11, t1.cx + t1.x11), cw);
                  context.arc(t1.cx, t1.cy, rc0, Math.atan2(t1.y11, t1.x11), Math.atan2(t1.y01, t1.x01), !cw);
                }
            }

            // Or is the inner ring just a circular arc?
            else context.arc(0, 0, r0, a10, a00, cw);
        }

    context.closePath();

    if (buffer) return context = null, buffer + "" || null;
  }

  arc.centroid = function () {
    var r = (+innerRadius.apply(this, arguments) + +outerRadius.apply(this, arguments)) / 2,
        a = (+startAngle.apply(this, arguments) + +endAngle.apply(this, arguments)) / 2 - pi$2 / 2;
    return [Math.cos(a) * r, Math.sin(a) * r];
  };

  arc.innerRadius = function (_) {
    return arguments.length ? (innerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : innerRadius;
  };

  arc.outerRadius = function (_) {
    return arguments.length ? (outerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : outerRadius;
  };

  arc.cornerRadius = function (_) {
    return arguments.length ? (cornerRadius = typeof _ === "function" ? _ : constant$2(+_), arc) : cornerRadius;
  };

  arc.padRadius = function (_) {
    return arguments.length ? (padRadius = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), arc) : padRadius;
  };

  arc.startAngle = function (_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : startAngle;
  };

  arc.endAngle = function (_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : endAngle;
  };

  arc.padAngle = function (_) {
    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$2(+_), arc) : padAngle;
  };

  arc.context = function (_) {
    return arguments.length ? (context = _ == null ? null : _, arc) : context;
  };

  return arc;
};

function Linear(context) {
  this._context = context;
}

Linear.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2; // proceed
      default:
        this._context.lineTo(x, y);break;
    }
  }
};

var curveLinear = function (context) {
  return new Linear(context);
};

function x$1(p) {
  return p[0];
}

function y(p) {
  return p[1];
}

var line = function () {
  var x$$1 = x$1,
      y$$1 = y,
      defined = constant$2(true),
      context = null,
      curve = curveLinear,
      output = null;

  function line(data) {
    var i,
        n = data.length,
        d,
        defined0 = false,
        buffer;

    if (context == null) output = curve(buffer = path());

    for (i = 0; i <= n; ++i) {
      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
        if (defined0 = !defined0) output.lineStart();else output.lineEnd();
      }
      if (defined0) output.point(+x$$1(d, i, data), +y$$1(d, i, data));
    }

    if (buffer) return output = null, buffer + "" || null;
  }

  line.x = function (_) {
    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$2(+_), line) : x$$1;
  };

  line.y = function (_) {
    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$2(+_), line) : y$$1;
  };

  line.defined = function (_) {
    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$2(!!_), line) : defined;
  };

  line.curve = function (_) {
    return arguments.length ? (curve = _, context != null && (output = curve(context)), line) : curve;
  };

  line.context = function (_) {
    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), line) : context;
  };

  return line;
};

var area$1 = function () {
  var x0 = x$1,
      x1 = null,
      y0 = constant$2(0),
      y1 = y,
      defined = constant$2(true),
      context = null,
      curve = curveLinear,
      output = null;

  function area(data) {
    var i,
        j,
        k,
        n = data.length,
        d,
        defined0 = false,
        buffer,
        x0z = new Array(n),
        y0z = new Array(n);

    if (context == null) output = curve(buffer = path());

    for (i = 0; i <= n; ++i) {
      if (!(i < n && defined(d = data[i], i, data)) === defined0) {
        if (defined0 = !defined0) {
          j = i;
          output.areaStart();
          output.lineStart();
        } else {
          output.lineEnd();
          output.lineStart();
          for (k = i - 1; k >= j; --k) {
            output.point(x0z[k], y0z[k]);
          }
          output.lineEnd();
          output.areaEnd();
        }
      }
      if (defined0) {
        x0z[i] = +x0(d, i, data), y0z[i] = +y0(d, i, data);
        output.point(x1 ? +x1(d, i, data) : x0z[i], y1 ? +y1(d, i, data) : y0z[i]);
      }
    }

    if (buffer) return output = null, buffer + "" || null;
  }

  function arealine() {
    return line().defined(defined).curve(curve).context(context);
  }

  area.x = function (_) {
    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$2(+_), x1 = null, area) : x0;
  };

  area.x0 = function (_) {
    return arguments.length ? (x0 = typeof _ === "function" ? _ : constant$2(+_), area) : x0;
  };

  area.x1 = function (_) {
    return arguments.length ? (x1 = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), area) : x1;
  };

  area.y = function (_) {
    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$2(+_), y1 = null, area) : y0;
  };

  area.y0 = function (_) {
    return arguments.length ? (y0 = typeof _ === "function" ? _ : constant$2(+_), area) : y0;
  };

  area.y1 = function (_) {
    return arguments.length ? (y1 = _ == null ? null : typeof _ === "function" ? _ : constant$2(+_), area) : y1;
  };

  area.lineX0 = area.lineY0 = function () {
    return arealine().x(x0).y(y0);
  };

  area.lineY1 = function () {
    return arealine().x(x0).y(y1);
  };

  area.lineX1 = function () {
    return arealine().x(x1).y(y0);
  };

  area.defined = function (_) {
    return arguments.length ? (defined = typeof _ === "function" ? _ : constant$2(!!_), area) : defined;
  };

  area.curve = function (_) {
    return arguments.length ? (curve = _, context != null && (output = curve(context)), area) : curve;
  };

  area.context = function (_) {
    return arguments.length ? (_ == null ? context = output = null : output = curve(context = _), area) : context;
  };

  return area;
};

var descending$1 = function (a, b) {
  return b < a ? -1 : b > a ? 1 : b >= a ? 0 : NaN;
};

var identity$1 = function (d) {
  return d;
};

var pie = function () {
  var value = identity$1,
      sortValues = descending$1,
      sort = null,
      startAngle = constant$2(0),
      endAngle = constant$2(tau$2),
      padAngle = constant$2(0);

  function pie(data) {
    var i,
        n = data.length,
        j,
        k,
        sum = 0,
        index = new Array(n),
        arcs = new Array(n),
        a0 = +startAngle.apply(this, arguments),
        da = Math.min(tau$2, Math.max(-tau$2, endAngle.apply(this, arguments) - a0)),
        a1,
        p = Math.min(Math.abs(da) / n, padAngle.apply(this, arguments)),
        pa = p * (da < 0 ? -1 : 1),
        v;

    for (i = 0; i < n; ++i) {
      if ((v = arcs[index[i] = i] = +value(data[i], i, data)) > 0) {
        sum += v;
      }
    }

    // Optionally sort the arcs by previously-computed values or by data.
    if (sortValues != null) index.sort(function (i, j) {
      return sortValues(arcs[i], arcs[j]);
    });else if (sort != null) index.sort(function (i, j) {
      return sort(data[i], data[j]);
    });

    // Compute the arcs! They are stored in the original data's order.
    for (i = 0, k = sum ? (da - n * pa) / sum : 0; i < n; ++i, a0 = a1) {
      j = index[i], v = arcs[j], a1 = a0 + (v > 0 ? v * k : 0) + pa, arcs[j] = {
        data: data[j],
        index: i,
        value: v,
        startAngle: a0,
        endAngle: a1,
        padAngle: p
      };
    }

    return arcs;
  }

  pie.value = function (_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant$2(+_), pie) : value;
  };

  pie.sortValues = function (_) {
    return arguments.length ? (sortValues = _, sort = null, pie) : sortValues;
  };

  pie.sort = function (_) {
    return arguments.length ? (sort = _, sortValues = null, pie) : sort;
  };

  pie.startAngle = function (_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : startAngle;
  };

  pie.endAngle = function (_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : endAngle;
  };

  pie.padAngle = function (_) {
    return arguments.length ? (padAngle = typeof _ === "function" ? _ : constant$2(+_), pie) : padAngle;
  };

  return pie;
};

var curveRadialLinear = curveRadial(curveLinear);

function Radial(curve) {
  this._curve = curve;
}

Radial.prototype = {
  areaStart: function areaStart() {
    this._curve.areaStart();
  },
  areaEnd: function areaEnd() {
    this._curve.areaEnd();
  },
  lineStart: function lineStart() {
    this._curve.lineStart();
  },
  lineEnd: function lineEnd() {
    this._curve.lineEnd();
  },
  point: function point(a, r) {
    this._curve.point(r * Math.sin(a), r * -Math.cos(a));
  }
};

function curveRadial(curve) {

  function radial(context) {
    return new Radial(curve(context));
  }

  radial._curve = curve;

  return radial;
}

function radialLine(l) {
  var c = l.curve;

  l.angle = l.x, delete l.x;
  l.radius = l.y, delete l.y;

  l.curve = function (_) {
    return arguments.length ? c(curveRadial(_)) : c()._curve;
  };

  return l;
}

var radialLine$1 = function () {
  return radialLine(line().curve(curveRadialLinear));
};

var radialArea = function () {
  var a = area$1().curve(curveRadialLinear),
      c = a.curve,
      x0 = a.lineX0,
      x1 = a.lineX1,
      y0 = a.lineY0,
      y1 = a.lineY1;

  a.angle = a.x, delete a.x;
  a.startAngle = a.x0, delete a.x0;
  a.endAngle = a.x1, delete a.x1;
  a.radius = a.y, delete a.y;
  a.innerRadius = a.y0, delete a.y0;
  a.outerRadius = a.y1, delete a.y1;
  a.lineStartAngle = function () {
    return radialLine(x0());
  }, delete a.lineX0;
  a.lineEndAngle = function () {
    return radialLine(x1());
  }, delete a.lineX1;
  a.lineInnerRadius = function () {
    return radialLine(y0());
  }, delete a.lineY0;
  a.lineOuterRadius = function () {
    return radialLine(y1());
  }, delete a.lineY1;

  a.curve = function (_) {
    return arguments.length ? c(curveRadial(_)) : c()._curve;
  };

  return a;
};

var circle = {
  draw: function draw(context, size) {
    var r = Math.sqrt(size / pi$2);
    context.moveTo(r, 0);
    context.arc(0, 0, r, 0, tau$2);
  }
};

var cross$1 = {
  draw: function draw(context, size) {
    var r = Math.sqrt(size / 5) / 2;
    context.moveTo(-3 * r, -r);
    context.lineTo(-r, -r);
    context.lineTo(-r, -3 * r);
    context.lineTo(r, -3 * r);
    context.lineTo(r, -r);
    context.lineTo(3 * r, -r);
    context.lineTo(3 * r, r);
    context.lineTo(r, r);
    context.lineTo(r, 3 * r);
    context.lineTo(-r, 3 * r);
    context.lineTo(-r, r);
    context.lineTo(-3 * r, r);
    context.closePath();
  }
};

var tan30 = Math.sqrt(1 / 3);
var tan30_2 = tan30 * 2;

var diamond = {
  draw: function draw(context, size) {
    var y = Math.sqrt(size / tan30_2),
        x = y * tan30;
    context.moveTo(0, -y);
    context.lineTo(x, 0);
    context.lineTo(0, y);
    context.lineTo(-x, 0);
    context.closePath();
  }
};

var ka = 0.89081309152928522810;
var kr = Math.sin(pi$2 / 10) / Math.sin(7 * pi$2 / 10);
var kx = Math.sin(tau$2 / 10) * kr;
var ky = -Math.cos(tau$2 / 10) * kr;

var star = {
    draw: function draw(context, size) {
        var r = Math.sqrt(size * ka),
            x = kx * r,
            y = ky * r;
        context.moveTo(0, -r);
        context.lineTo(x, y);
        for (var i = 1; i < 5; ++i) {
            var a = tau$2 * i / 5,
                c = Math.cos(a),
                s = Math.sin(a);
            context.lineTo(s * r, -c * r);
            context.lineTo(c * x - s * y, s * x + c * y);
        }
        context.closePath();
    }
};

var square = {
  draw: function draw(context, size) {
    var w = Math.sqrt(size),
        x = -w / 2;
    context.rect(x, x, w, w);
  }
};

var sqrt3 = Math.sqrt(3);

var triangle = {
  draw: function draw(context, size) {
    var y = -Math.sqrt(size / (sqrt3 * 3));
    context.moveTo(0, y * 2);
    context.lineTo(-sqrt3 * y, -y);
    context.lineTo(sqrt3 * y, -y);
    context.closePath();
  }
};

var c$1 = -0.5;
var s = Math.sqrt(3) / 2;
var k = 1 / Math.sqrt(12);
var a = (k / 2 + 1) * 3;

var wye = {
    draw: function draw(context, size) {
        var r = Math.sqrt(size / a),
            x0 = r / 2,
            y0 = r * k,
            x1 = x0,
            y1 = r * k + r,
            x2 = -x1,
            y2 = y1;
        context.moveTo(x0, y0);
        context.lineTo(x1, y1);
        context.lineTo(x2, y2);
        context.lineTo(c$1 * x0 - s * y0, s * x0 + c$1 * y0);
        context.lineTo(c$1 * x1 - s * y1, s * x1 + c$1 * y1);
        context.lineTo(c$1 * x2 - s * y2, s * x2 + c$1 * y2);
        context.lineTo(c$1 * x0 + s * y0, c$1 * y0 - s * x0);
        context.lineTo(c$1 * x1 + s * y1, c$1 * y1 - s * x1);
        context.lineTo(c$1 * x2 + s * y2, c$1 * y2 - s * x2);
        context.closePath();
    }
};

var symbols = [circle, cross$1, diamond, square, star, triangle, wye];

var symbol = function () {
  var type = constant$2(circle),
      size = constant$2(64),
      context = null;

  function symbol() {
    var buffer;
    if (!context) context = buffer = path();
    type.apply(this, arguments).draw(context, +size.apply(this, arguments));
    if (buffer) return context = null, buffer + "" || null;
  }

  symbol.type = function (_) {
    return arguments.length ? (type = typeof _ === "function" ? _ : constant$2(_), symbol) : type;
  };

  symbol.size = function (_) {
    return arguments.length ? (size = typeof _ === "function" ? _ : constant$2(+_), symbol) : size;
  };

  symbol.context = function (_) {
    return arguments.length ? (context = _ == null ? null : _, symbol) : context;
  };

  return symbol;
};

var noop = function () {};

function _point(that, x, y) {
  that._context.bezierCurveTo((2 * that._x0 + that._x1) / 3, (2 * that._y0 + that._y1) / 3, (that._x0 + 2 * that._x1) / 3, (that._y0 + 2 * that._y1) / 3, (that._x0 + 4 * that._x1 + x) / 6, (that._y0 + 4 * that._y1 + y) / 6);
}

function Basis(context) {
  this._context = context;
}

Basis.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._y0 = this._y1 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 3:
        _point(this, this._x1, this._y1); // proceed
      case 2:
        this._context.lineTo(this._x1, this._y1);break;
    }
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3;this._context.lineTo((5 * this._x0 + this._x1) / 6, (5 * this._y0 + this._y1) / 6); // proceed
      default:
        _point(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basis = function (context) {
  return new Basis(context);
};

function BasisClosed(context) {
  this._context = context;
}

BasisClosed.prototype = {
  areaStart: noop,
  areaEnd: noop,
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 1:
        {
          this._context.moveTo(this._x2, this._y2);
          this._context.closePath();
          break;
        }
      case 2:
        {
          this._context.moveTo((this._x2 + 2 * this._x3) / 3, (this._y2 + 2 * this._y3) / 3);
          this._context.lineTo((this._x3 + 2 * this._x2) / 3, (this._y3 + 2 * this._y2) / 3);
          this._context.closePath();
          break;
        }
      case 3:
        {
          this.point(this._x2, this._y2);
          this.point(this._x3, this._y3);
          this.point(this._x4, this._y4);
          break;
        }
    }
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._x2 = x, this._y2 = y;break;
      case 1:
        this._point = 2;this._x3 = x, this._y3 = y;break;
      case 2:
        this._point = 3;this._x4 = x, this._y4 = y;this._context.moveTo((this._x0 + 4 * this._x1 + x) / 6, (this._y0 + 4 * this._y1 + y) / 6);break;
      default:
        _point(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basisClosed = function (context) {
  return new BasisClosed(context);
};

function BasisOpen(context) {
  this._context = context;
}

BasisOpen.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._y0 = this._y1 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line || this._line !== 0 && this._point === 3) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3;var x0 = (this._x0 + 4 * this._x1 + x) / 6,
            y0 = (this._y0 + 4 * this._y1 + y) / 6;this._line ? this._context.lineTo(x0, y0) : this._context.moveTo(x0, y0);break;
      case 3:
        this._point = 4; // proceed
      default:
        _point(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
  }
};

var basisOpen = function (context) {
  return new BasisOpen(context);
};

function Bundle(context, beta) {
  this._basis = new Basis(context);
  this._beta = beta;
}

Bundle.prototype = {
  lineStart: function lineStart() {
    this._x = [];
    this._y = [];
    this._basis.lineStart();
  },
  lineEnd: function lineEnd() {
    var x = this._x,
        y = this._y,
        j = x.length - 1;

    if (j > 0) {
      var x0 = x[0],
          y0 = y[0],
          dx = x[j] - x0,
          dy = y[j] - y0,
          i = -1,
          t;

      while (++i <= j) {
        t = i / j;
        this._basis.point(this._beta * x[i] + (1 - this._beta) * (x0 + t * dx), this._beta * y[i] + (1 - this._beta) * (y0 + t * dy));
      }
    }

    this._x = this._y = null;
    this._basis.lineEnd();
  },
  point: function point(x, y) {
    this._x.push(+x);
    this._y.push(+y);
  }
};

var bundle = (function custom(beta) {

  function bundle(context) {
    return beta === 1 ? new Basis(context) : new Bundle(context, beta);
  }

  bundle.beta = function (beta) {
    return custom(+beta);
  };

  return bundle;
})(0.85);

function _point$1(that, x, y) {
  that._context.bezierCurveTo(that._x1 + that._k * (that._x2 - that._x0), that._y1 + that._k * (that._y2 - that._y0), that._x2 + that._k * (that._x1 - x), that._y2 + that._k * (that._y1 - y), that._x2, that._y2);
}

function Cardinal(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

Cardinal.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._y0 = this._y1 = this._y2 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 2:
        this._context.lineTo(this._x2, this._y2);break;
      case 3:
        _point$1(this, this._x1, this._y1);break;
    }
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2;this._x1 = x, this._y1 = y;break;
      case 2:
        this._point = 3; // proceed
      default:
        _point$1(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinal = (function custom(tension) {

  function cardinal(context) {
    return new Cardinal(context, tension);
  }

  cardinal.tension = function (tension) {
    return custom(+tension);
  };

  return cardinal;
})(0);

function CardinalClosed(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

CardinalClosed.prototype = {
  areaStart: noop,
  areaEnd: noop,
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 = this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 1:
        {
          this._context.moveTo(this._x3, this._y3);
          this._context.closePath();
          break;
        }
      case 2:
        {
          this._context.lineTo(this._x3, this._y3);
          this._context.closePath();
          break;
        }
      case 3:
        {
          this.point(this._x3, this._y3);
          this.point(this._x4, this._y4);
          this.point(this._x5, this._y5);
          break;
        }
    }
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._x3 = x, this._y3 = y;break;
      case 1:
        this._point = 2;this._context.moveTo(this._x4 = x, this._y4 = y);break;
      case 2:
        this._point = 3;this._x5 = x, this._y5 = y;break;
      default:
        _point$1(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinalClosed = (function custom(tension) {

  function cardinal(context) {
    return new CardinalClosed(context, tension);
  }

  cardinal.tension = function (tension) {
    return custom(+tension);
  };

  return cardinal;
})(0);

function CardinalOpen(context, tension) {
  this._context = context;
  this._k = (1 - tension) / 6;
}

CardinalOpen.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._y0 = this._y1 = this._y2 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line || this._line !== 0 && this._point === 3) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3;this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2);break;
      case 3:
        this._point = 4; // proceed
      default:
        _point$1(this, x, y);break;
    }
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var cardinalOpen = (function custom(tension) {

  function cardinal(context) {
    return new CardinalOpen(context, tension);
  }

  cardinal.tension = function (tension) {
    return custom(+tension);
  };

  return cardinal;
})(0);

function _point$2(that, x, y) {
  var x1 = that._x1,
      y1 = that._y1,
      x2 = that._x2,
      y2 = that._y2;

  if (that._l01_a > epsilon$1) {
    var a = 2 * that._l01_2a + 3 * that._l01_a * that._l12_a + that._l12_2a,
        n = 3 * that._l01_a * (that._l01_a + that._l12_a);
    x1 = (x1 * a - that._x0 * that._l12_2a + that._x2 * that._l01_2a) / n;
    y1 = (y1 * a - that._y0 * that._l12_2a + that._y2 * that._l01_2a) / n;
  }

  if (that._l23_a > epsilon$1) {
    var b = 2 * that._l23_2a + 3 * that._l23_a * that._l12_a + that._l12_2a,
        m = 3 * that._l23_a * (that._l23_a + that._l12_a);
    x2 = (x2 * b + that._x1 * that._l23_2a - x * that._l12_2a) / m;
    y2 = (y2 * b + that._y1 * that._l23_2a - y * that._l12_2a) / m;
  }

  that._context.bezierCurveTo(x1, y1, x2, y2, that._x2, that._y2);
}

function CatmullRom(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRom.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._y0 = this._y1 = this._y2 = NaN;
    this._l01_a = this._l12_a = this._l23_a = this._l01_2a = this._l12_2a = this._l23_2a = this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 2:
        this._context.lineTo(this._x2, this._y2);break;
      case 3:
        this.point(this._x2, this._y2);break;
    }
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3; // proceed
      default:
        _point$2(this, x, y);break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRom = (function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRom(context, alpha) : new Cardinal(context, 0);
  }

  catmullRom.alpha = function (alpha) {
    return custom(+alpha);
  };

  return catmullRom;
})(0.5);

function CatmullRomClosed(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRomClosed.prototype = {
  areaStart: noop,
  areaEnd: noop,
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._x3 = this._x4 = this._x5 = this._y0 = this._y1 = this._y2 = this._y3 = this._y4 = this._y5 = NaN;
    this._l01_a = this._l12_a = this._l23_a = this._l01_2a = this._l12_2a = this._l23_2a = this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 1:
        {
          this._context.moveTo(this._x3, this._y3);
          this._context.closePath();
          break;
        }
      case 2:
        {
          this._context.lineTo(this._x3, this._y3);
          this._context.closePath();
          break;
        }
      case 3:
        {
          this.point(this._x3, this._y3);
          this.point(this._x4, this._y4);
          this.point(this._x5, this._y5);
          break;
        }
    }
  },
  point: function point(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0:
        this._point = 1;this._x3 = x, this._y3 = y;break;
      case 1:
        this._point = 2;this._context.moveTo(this._x4 = x, this._y4 = y);break;
      case 2:
        this._point = 3;this._x5 = x, this._y5 = y;break;
      default:
        _point$2(this, x, y);break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRomClosed = (function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRomClosed(context, alpha) : new CardinalClosed(context, 0);
  }

  catmullRom.alpha = function (alpha) {
    return custom(+alpha);
  };

  return catmullRom;
})(0.5);

function CatmullRomOpen(context, alpha) {
  this._context = context;
  this._alpha = alpha;
}

CatmullRomOpen.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._x2 = this._y0 = this._y1 = this._y2 = NaN;
    this._l01_a = this._l12_a = this._l23_a = this._l01_2a = this._l12_2a = this._l23_2a = this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line || this._line !== 0 && this._point === 3) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;

    if (this._point) {
      var x23 = this._x2 - x,
          y23 = this._y2 - y;
      this._l23_a = Math.sqrt(this._l23_2a = Math.pow(x23 * x23 + y23 * y23, this._alpha));
    }

    switch (this._point) {
      case 0:
        this._point = 1;break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3;this._line ? this._context.lineTo(this._x2, this._y2) : this._context.moveTo(this._x2, this._y2);break;
      case 3:
        this._point = 4; // proceed
      default:
        _point$2(this, x, y);break;
    }

    this._l01_a = this._l12_a, this._l12_a = this._l23_a;
    this._l01_2a = this._l12_2a, this._l12_2a = this._l23_2a;
    this._x0 = this._x1, this._x1 = this._x2, this._x2 = x;
    this._y0 = this._y1, this._y1 = this._y2, this._y2 = y;
  }
};

var catmullRomOpen = (function custom(alpha) {

  function catmullRom(context) {
    return alpha ? new CatmullRomOpen(context, alpha) : new CardinalOpen(context, 0);
  }

  catmullRom.alpha = function (alpha) {
    return custom(+alpha);
  };

  return catmullRom;
})(0.5);

function LinearClosed(context) {
  this._context = context;
}

LinearClosed.prototype = {
  areaStart: noop,
  areaEnd: noop,
  lineStart: function lineStart() {
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._point) this._context.closePath();
  },
  point: function point(x, y) {
    x = +x, y = +y;
    if (this._point) this._context.lineTo(x, y);else this._point = 1, this._context.moveTo(x, y);
  }
};

var linearClosed = function (context) {
  return new LinearClosed(context);
};

function sign(x) {
  return x < 0 ? -1 : 1;
}

// Calculate the slopes of the tangents (Hermite-type interpolation) based on
// the following paper: Steffen, M. 1990. A Simple Method for Monotonic
// Interpolation in One Dimension. Astronomy and Astrophysics, Vol. 239, NO.
// NOV(II), P. 443, 1990.
function slope3(that, x2, y2) {
  var h0 = that._x1 - that._x0,
      h1 = x2 - that._x1,
      s0 = (that._y1 - that._y0) / (h0 || h1 < 0 && -0),
      s1 = (y2 - that._y1) / (h1 || h0 < 0 && -0),
      p = (s0 * h1 + s1 * h0) / (h0 + h1);
  return (sign(s0) + sign(s1)) * Math.min(Math.abs(s0), Math.abs(s1), 0.5 * Math.abs(p)) || 0;
}

// Calculate a one-sided slope.
function slope2(that, t) {
  var h = that._x1 - that._x0;
  return h ? (3 * (that._y1 - that._y0) / h - t) / 2 : t;
}

// According to https://en.wikipedia.org/wiki/Cubic_Hermite_spline#Representations
// "you can express cubic Hermite interpolation in terms of cubic Bézier curves
// with respect to the four values p0, p0 + m0 / 3, p1 - m1 / 3, p1".
function _point$3(that, t0, t1) {
  var x0 = that._x0,
      y0 = that._y0,
      x1 = that._x1,
      y1 = that._y1,
      dx = (x1 - x0) / 3;
  that._context.bezierCurveTo(x0 + dx, y0 + dx * t0, x1 - dx, y1 - dx * t1, x1, y1);
}

function MonotoneX(context) {
  this._context = context;
}

MonotoneX.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x0 = this._x1 = this._y0 = this._y1 = this._t0 = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    switch (this._point) {
      case 2:
        this._context.lineTo(this._x1, this._y1);break;
      case 3:
        _point$3(this, this._t0, slope2(this, this._t0));break;
    }
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    this._line = 1 - this._line;
  },
  point: function point(x, y) {
    var t1 = NaN;

    x = +x, y = +y;
    if (x === this._x1 && y === this._y1) return; // Ignore coincident points.
    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2;break;
      case 2:
        this._point = 3;_point$3(this, slope2(this, t1 = slope3(this, x, y)), t1);break;
      default:
        _point$3(this, this._t0, t1 = slope3(this, x, y));break;
    }

    this._x0 = this._x1, this._x1 = x;
    this._y0 = this._y1, this._y1 = y;
    this._t0 = t1;
  }
};

function MonotoneY(context) {
  this._context = new ReflectContext(context);
}

(MonotoneY.prototype = Object.create(MonotoneX.prototype)).point = function (x, y) {
  MonotoneX.prototype.point.call(this, y, x);
};

function ReflectContext(context) {
  this._context = context;
}

ReflectContext.prototype = {
  moveTo: function moveTo(x, y) {
    this._context.moveTo(y, x);
  },
  closePath: function closePath() {
    this._context.closePath();
  },
  lineTo: function lineTo(x, y) {
    this._context.lineTo(y, x);
  },
  bezierCurveTo: function bezierCurveTo(x1, y1, x2, y2, x, y) {
    this._context.bezierCurveTo(y1, x1, y2, x2, y, x);
  }
};

function monotoneX(context) {
  return new MonotoneX(context);
}

function monotoneY(context) {
  return new MonotoneY(context);
}

function Natural(context) {
  this._context = context;
}

Natural.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x = [];
    this._y = [];
  },
  lineEnd: function lineEnd() {
    var x = this._x,
        y = this._y,
        n = x.length;

    if (n) {
      this._line ? this._context.lineTo(x[0], y[0]) : this._context.moveTo(x[0], y[0]);
      if (n === 2) {
        this._context.lineTo(x[1], y[1]);
      } else {
        var px = controlPoints(x),
            py = controlPoints(y);
        for (var i0 = 0, i1 = 1; i1 < n; ++i0, ++i1) {
          this._context.bezierCurveTo(px[0][i0], py[0][i0], px[1][i0], py[1][i0], x[i1], y[i1]);
        }
      }
    }

    if (this._line || this._line !== 0 && n === 1) this._context.closePath();
    this._line = 1 - this._line;
    this._x = this._y = null;
  },
  point: function point(x, y) {
    this._x.push(+x);
    this._y.push(+y);
  }
};

// See https://www.particleincell.com/2012/bezier-splines/ for derivation.
function controlPoints(x) {
  var i,
      n = x.length - 1,
      m,
      a = new Array(n),
      b = new Array(n),
      r = new Array(n);
  a[0] = 0, b[0] = 2, r[0] = x[0] + 2 * x[1];
  for (i = 1; i < n - 1; ++i) {
    a[i] = 1, b[i] = 4, r[i] = 4 * x[i] + 2 * x[i + 1];
  }a[n - 1] = 2, b[n - 1] = 7, r[n - 1] = 8 * x[n - 1] + x[n];
  for (i = 1; i < n; ++i) {
    m = a[i] / b[i - 1], b[i] -= m, r[i] -= m * r[i - 1];
  }a[n - 1] = r[n - 1] / b[n - 1];
  for (i = n - 2; i >= 0; --i) {
    a[i] = (r[i] - a[i + 1]) / b[i];
  }b[n - 1] = (x[n] + a[n - 1]) / 2;
  for (i = 0; i < n - 1; ++i) {
    b[i] = 2 * x[i + 1] - a[i + 1];
  }return [a, b];
}

var natural = function (context) {
  return new Natural(context);
};

function Step(context, t) {
  this._context = context;
  this._t = t;
}

Step.prototype = {
  areaStart: function areaStart() {
    this._line = 0;
  },
  areaEnd: function areaEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._x = this._y = NaN;
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (0 < this._t && this._t < 1 && this._point === 2) this._context.lineTo(this._x, this._y);
    if (this._line || this._line !== 0 && this._point === 1) this._context.closePath();
    if (this._line >= 0) this._t = 1 - this._t, this._line = 1 - this._line;
  },
  point: function point(x, y) {
    x = +x, y = +y;
    switch (this._point) {
      case 0:
        this._point = 1;this._line ? this._context.lineTo(x, y) : this._context.moveTo(x, y);break;
      case 1:
        this._point = 2; // proceed
      default:
        {
          if (this._t <= 0) {
            this._context.lineTo(this._x, y);
            this._context.lineTo(x, y);
          } else {
            var x1 = this._x * (1 - this._t) + x * this._t;
            this._context.lineTo(x1, this._y);
            this._context.lineTo(x1, y);
          }
          break;
        }
    }
    this._x = x, this._y = y;
  }
};

var step = function (context) {
  return new Step(context, 0.5);
};

function stepBefore(context) {
  return new Step(context, 0);
}

function stepAfter(context) {
  return new Step(context, 1);
}

var slice$1 = Array.prototype.slice;

var none = function (series, order) {
  if (!((n = series.length) > 1)) return;
  for (var i = 1, s0, s1 = series[order[0]], n, m = s1.length; i < n; ++i) {
    s0 = s1, s1 = series[order[i]];
    for (var j = 0; j < m; ++j) {
      s1[j][1] += s1[j][0] = isNaN(s0[j][1]) ? s0[j][0] : s0[j][1];
    }
  }
};

var none$1 = function (series) {
  var n = series.length,
      o = new Array(n);
  while (--n >= 0) {
    o[n] = n;
  }return o;
};

function stackValue(d, key) {
  return d[key];
}

var stack = function () {
  var keys = constant$2([]),
      order = none$1,
      offset = none,
      value = stackValue;

  function stack(data) {
    var kz = keys.apply(this, arguments),
        i,
        m = data.length,
        n = kz.length,
        sz = new Array(n),
        oz;

    for (i = 0; i < n; ++i) {
      for (var ki = kz[i], si = sz[i] = new Array(m), j = 0, sij; j < m; ++j) {
        si[j] = sij = [0, +value(data[j], ki, j, data)];
        sij.data = data[j];
      }
      si.key = ki;
    }

    for (i = 0, oz = order(sz); i < n; ++i) {
      sz[oz[i]].index = i;
    }

    offset(sz, oz);
    return sz;
  }

  stack.keys = function (_) {
    return arguments.length ? (keys = typeof _ === "function" ? _ : constant$2(slice$1.call(_)), stack) : keys;
  };

  stack.value = function (_) {
    return arguments.length ? (value = typeof _ === "function" ? _ : constant$2(+_), stack) : value;
  };

  stack.order = function (_) {
    return arguments.length ? (order = _ == null ? none$1 : typeof _ === "function" ? _ : constant$2(slice$1.call(_)), stack) : order;
  };

  stack.offset = function (_) {
    return arguments.length ? (offset = _ == null ? none : _, stack) : offset;
  };

  return stack;
};

var expand = function (series, order) {
  if (!((n = series.length) > 0)) return;
  for (var i, n, j = 0, m = series[0].length, y; j < m; ++j) {
    for (y = i = 0; i < n; ++i) {
      y += series[i][j][1] || 0;
    }if (y) for (i = 0; i < n; ++i) {
      series[i][j][1] /= y;
    }
  }
  none(series, order);
};

var silhouette = function (series, order) {
  if (!((n = series.length) > 0)) return;
  for (var j = 0, s0 = series[order[0]], n, m = s0.length; j < m; ++j) {
    for (var i = 0, y = 0; i < n; ++i) {
      y += series[i][j][1] || 0;
    }s0[j][1] += s0[j][0] = -y / 2;
  }
  none(series, order);
};

var wiggle = function (series, order) {
  if (!((n = series.length) > 0) || !((m = (s0 = series[order[0]]).length) > 0)) return;
  for (var y = 0, j = 1, s0, m, n; j < m; ++j) {
    for (var i = 0, s1 = 0, s2 = 0; i < n; ++i) {
      var si = series[order[i]],
          sij0 = si[j][1] || 0,
          sij1 = si[j - 1][1] || 0,
          s3 = (sij0 - sij1) / 2;
      for (var k = 0; k < i; ++k) {
        var sk = series[order[k]],
            skj0 = sk[j][1] || 0,
            skj1 = sk[j - 1][1] || 0;
        s3 += skj0 - skj1;
      }
      s1 += sij0, s2 += s3 * sij0;
    }
    s0[j - 1][1] += s0[j - 1][0] = y;
    if (s1) y -= s2 / s1;
  }
  s0[j - 1][1] += s0[j - 1][0] = y;
  none(series, order);
};

var ascending$1 = function (series) {
  var sums = series.map(sum$1);
  return none$1(series).sort(function (a, b) {
    return sums[a] - sums[b];
  });
};

function sum$1(series) {
  var s = 0,
      i = -1,
      n = series.length,
      v;
  while (++i < n) {
    if (v = +series[i][1]) s += v;
  }return s;
}

var descending$2 = function (series) {
  return ascending$1(series).reverse();
};

var insideOut = function (series) {
  var n = series.length,
      i,
      j,
      sums = series.map(sum$1),
      order = none$1(series).sort(function (a, b) {
    return sums[b] - sums[a];
  }),
      top = 0,
      bottom = 0,
      tops = [],
      bottoms = [];

  for (i = 0; i < n; ++i) {
    j = order[i];
    if (top < bottom) {
      top += sums[j];
      tops.push(j);
    } else {
      bottom += sums[j];
      bottoms.push(j);
    }
  }

  return bottoms.reverse().concat(tops);
};

var reverse = function (series) {
  return none$1(series).reverse();
};

var define = function (constructor, factory, prototype) {
  constructor.prototype = factory.prototype = prototype;
  prototype.constructor = constructor;
};

function extend(parent, definition) {
  var prototype = Object.create(parent.prototype);
  for (var key in definition) {
    prototype[key] = definition[key];
  }return prototype;
}

function Color() {}

var _darker = 0.7;
var _brighter = 1 / _darker;

var reI = "\\s*([+-]?\\d+)\\s*";
var reN = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)\\s*";
var reP = "\\s*([+-]?\\d*\\.?\\d+(?:[eE][+-]?\\d+)?)%\\s*";
var reHex3 = /^#([0-9a-f]{3})$/;
var reHex6 = /^#([0-9a-f]{6})$/;
var reRgbInteger = new RegExp("^rgb\\(" + [reI, reI, reI] + "\\)$");
var reRgbPercent = new RegExp("^rgb\\(" + [reP, reP, reP] + "\\)$");
var reRgbaInteger = new RegExp("^rgba\\(" + [reI, reI, reI, reN] + "\\)$");
var reRgbaPercent = new RegExp("^rgba\\(" + [reP, reP, reP, reN] + "\\)$");
var reHslPercent = new RegExp("^hsl\\(" + [reN, reP, reP] + "\\)$");
var reHslaPercent = new RegExp("^hsla\\(" + [reN, reP, reP, reN] + "\\)$");

var named = {
  aliceblue: 0xf0f8ff,
  antiquewhite: 0xfaebd7,
  aqua: 0x00ffff,
  aquamarine: 0x7fffd4,
  azure: 0xf0ffff,
  beige: 0xf5f5dc,
  bisque: 0xffe4c4,
  black: 0x000000,
  blanchedalmond: 0xffebcd,
  blue: 0x0000ff,
  blueviolet: 0x8a2be2,
  brown: 0xa52a2a,
  burlywood: 0xdeb887,
  cadetblue: 0x5f9ea0,
  chartreuse: 0x7fff00,
  chocolate: 0xd2691e,
  coral: 0xff7f50,
  cornflowerblue: 0x6495ed,
  cornsilk: 0xfff8dc,
  crimson: 0xdc143c,
  cyan: 0x00ffff,
  darkblue: 0x00008b,
  darkcyan: 0x008b8b,
  darkgoldenrod: 0xb8860b,
  darkgray: 0xa9a9a9,
  darkgreen: 0x006400,
  darkgrey: 0xa9a9a9,
  darkkhaki: 0xbdb76b,
  darkmagenta: 0x8b008b,
  darkolivegreen: 0x556b2f,
  darkorange: 0xff8c00,
  darkorchid: 0x9932cc,
  darkred: 0x8b0000,
  darksalmon: 0xe9967a,
  darkseagreen: 0x8fbc8f,
  darkslateblue: 0x483d8b,
  darkslategray: 0x2f4f4f,
  darkslategrey: 0x2f4f4f,
  darkturquoise: 0x00ced1,
  darkviolet: 0x9400d3,
  deeppink: 0xff1493,
  deepskyblue: 0x00bfff,
  dimgray: 0x696969,
  dimgrey: 0x696969,
  dodgerblue: 0x1e90ff,
  firebrick: 0xb22222,
  floralwhite: 0xfffaf0,
  forestgreen: 0x228b22,
  fuchsia: 0xff00ff,
  gainsboro: 0xdcdcdc,
  ghostwhite: 0xf8f8ff,
  gold: 0xffd700,
  goldenrod: 0xdaa520,
  gray: 0x808080,
  green: 0x008000,
  greenyellow: 0xadff2f,
  grey: 0x808080,
  honeydew: 0xf0fff0,
  hotpink: 0xff69b4,
  indianred: 0xcd5c5c,
  indigo: 0x4b0082,
  ivory: 0xfffff0,
  khaki: 0xf0e68c,
  lavender: 0xe6e6fa,
  lavenderblush: 0xfff0f5,
  lawngreen: 0x7cfc00,
  lemonchiffon: 0xfffacd,
  lightblue: 0xadd8e6,
  lightcoral: 0xf08080,
  lightcyan: 0xe0ffff,
  lightgoldenrodyellow: 0xfafad2,
  lightgray: 0xd3d3d3,
  lightgreen: 0x90ee90,
  lightgrey: 0xd3d3d3,
  lightpink: 0xffb6c1,
  lightsalmon: 0xffa07a,
  lightseagreen: 0x20b2aa,
  lightskyblue: 0x87cefa,
  lightslategray: 0x778899,
  lightslategrey: 0x778899,
  lightsteelblue: 0xb0c4de,
  lightyellow: 0xffffe0,
  lime: 0x00ff00,
  limegreen: 0x32cd32,
  linen: 0xfaf0e6,
  magenta: 0xff00ff,
  maroon: 0x800000,
  mediumaquamarine: 0x66cdaa,
  mediumblue: 0x0000cd,
  mediumorchid: 0xba55d3,
  mediumpurple: 0x9370db,
  mediumseagreen: 0x3cb371,
  mediumslateblue: 0x7b68ee,
  mediumspringgreen: 0x00fa9a,
  mediumturquoise: 0x48d1cc,
  mediumvioletred: 0xc71585,
  midnightblue: 0x191970,
  mintcream: 0xf5fffa,
  mistyrose: 0xffe4e1,
  moccasin: 0xffe4b5,
  navajowhite: 0xffdead,
  navy: 0x000080,
  oldlace: 0xfdf5e6,
  olive: 0x808000,
  olivedrab: 0x6b8e23,
  orange: 0xffa500,
  orangered: 0xff4500,
  orchid: 0xda70d6,
  palegoldenrod: 0xeee8aa,
  palegreen: 0x98fb98,
  paleturquoise: 0xafeeee,
  palevioletred: 0xdb7093,
  papayawhip: 0xffefd5,
  peachpuff: 0xffdab9,
  peru: 0xcd853f,
  pink: 0xffc0cb,
  plum: 0xdda0dd,
  powderblue: 0xb0e0e6,
  purple: 0x800080,
  rebeccapurple: 0x663399,
  red: 0xff0000,
  rosybrown: 0xbc8f8f,
  royalblue: 0x4169e1,
  saddlebrown: 0x8b4513,
  salmon: 0xfa8072,
  sandybrown: 0xf4a460,
  seagreen: 0x2e8b57,
  seashell: 0xfff5ee,
  sienna: 0xa0522d,
  silver: 0xc0c0c0,
  skyblue: 0x87ceeb,
  slateblue: 0x6a5acd,
  slategray: 0x708090,
  slategrey: 0x708090,
  snow: 0xfffafa,
  springgreen: 0x00ff7f,
  steelblue: 0x4682b4,
  tan: 0xd2b48c,
  teal: 0x008080,
  thistle: 0xd8bfd8,
  tomato: 0xff6347,
  turquoise: 0x40e0d0,
  violet: 0xee82ee,
  wheat: 0xf5deb3,
  white: 0xffffff,
  whitesmoke: 0xf5f5f5,
  yellow: 0xffff00,
  yellowgreen: 0x9acd32
};

define(Color, color, {
  displayable: function displayable() {
    return this.rgb().displayable();
  },
  toString: function toString() {
    return this.rgb() + "";
  }
});

function color(format) {
  var m;
  format = (format + "").trim().toLowerCase();
  return (m = reHex3.exec(format)) ? (m = parseInt(m[1], 16), new Rgb(m >> 8 & 0xf | m >> 4 & 0x0f0, m >> 4 & 0xf | m & 0xf0, (m & 0xf) << 4 | m & 0xf, 1) // #f00
  ) : (m = reHex6.exec(format)) ? rgbn(parseInt(m[1], 16)) // #ff0000
  : (m = reRgbInteger.exec(format)) ? new Rgb(m[1], m[2], m[3], 1) // rgb(255, 0, 0)
  : (m = reRgbPercent.exec(format)) ? new Rgb(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, 1) // rgb(100%, 0%, 0%)
  : (m = reRgbaInteger.exec(format)) ? rgba(m[1], m[2], m[3], m[4]) // rgba(255, 0, 0, 1)
  : (m = reRgbaPercent.exec(format)) ? rgba(m[1] * 255 / 100, m[2] * 255 / 100, m[3] * 255 / 100, m[4]) // rgb(100%, 0%, 0%, 1)
  : (m = reHslPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, 1) // hsl(120, 50%, 50%)
  : (m = reHslaPercent.exec(format)) ? hsla(m[1], m[2] / 100, m[3] / 100, m[4]) // hsla(120, 50%, 50%, 1)
  : named.hasOwnProperty(format) ? rgbn(named[format]) : format === "transparent" ? new Rgb(NaN, NaN, NaN, 0) : null;
}

function rgbn(n) {
  return new Rgb(n >> 16 & 0xff, n >> 8 & 0xff, n & 0xff, 1);
}

function rgba(r, g, b, a) {
  if (a <= 0) r = g = b = NaN;
  return new Rgb(r, g, b, a);
}

function rgbConvert(o) {
  if (!(o instanceof Color)) o = color(o);
  if (!o) return new Rgb();
  o = o.rgb();
  return new Rgb(o.r, o.g, o.b, o.opacity);
}

function rgb$1(r, g, b, opacity) {
  return arguments.length === 1 ? rgbConvert(r) : new Rgb(r, g, b, opacity == null ? 1 : opacity);
}

function Rgb(r, g, b, opacity) {
  this.r = +r;
  this.g = +g;
  this.b = +b;
  this.opacity = +opacity;
}

define(Rgb, rgb$1, extend(Color, {
  brighter: function brighter(k) {
    k = k == null ? _brighter : Math.pow(_brighter, k);
    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
  },
  darker: function darker(k) {
    k = k == null ? _darker : Math.pow(_darker, k);
    return new Rgb(this.r * k, this.g * k, this.b * k, this.opacity);
  },
  rgb: function rgb$1() {
    return this;
  },
  displayable: function displayable() {
    return 0 <= this.r && this.r <= 255 && 0 <= this.g && this.g <= 255 && 0 <= this.b && this.b <= 255 && 0 <= this.opacity && this.opacity <= 1;
  },
  toString: function toString() {
    var a = this.opacity;a = isNaN(a) ? 1 : Math.max(0, Math.min(1, a));
    return (a === 1 ? "rgb(" : "rgba(") + Math.max(0, Math.min(255, Math.round(this.r) || 0)) + ", " + Math.max(0, Math.min(255, Math.round(this.g) || 0)) + ", " + Math.max(0, Math.min(255, Math.round(this.b) || 0)) + (a === 1 ? ")" : ", " + a + ")");
  }
}));

function hsla(h, s, l, a) {
  if (a <= 0) h = s = l = NaN;else if (l <= 0 || l >= 1) h = s = NaN;else if (s <= 0) h = NaN;
  return new Hsl(h, s, l, a);
}

function hslConvert(o) {
  if (o instanceof Hsl) return new Hsl(o.h, o.s, o.l, o.opacity);
  if (!(o instanceof Color)) o = color(o);
  if (!o) return new Hsl();
  if (o instanceof Hsl) return o;
  o = o.rgb();
  var r = o.r / 255,
      g = o.g / 255,
      b = o.b / 255,
      min = Math.min(r, g, b),
      max = Math.max(r, g, b),
      h = NaN,
      s = max - min,
      l = (max + min) / 2;
  if (s) {
    if (r === max) h = (g - b) / s + (g < b) * 6;else if (g === max) h = (b - r) / s + 2;else h = (r - g) / s + 4;
    s /= l < 0.5 ? max + min : 2 - max - min;
    h *= 60;
  } else {
    s = l > 0 && l < 1 ? 0 : h;
  }
  return new Hsl(h, s, l, o.opacity);
}

function hsl(h, s, l, opacity) {
  return arguments.length === 1 ? hslConvert(h) : new Hsl(h, s, l, opacity == null ? 1 : opacity);
}

function Hsl(h, s, l, opacity) {
  this.h = +h;
  this.s = +s;
  this.l = +l;
  this.opacity = +opacity;
}

define(Hsl, hsl, extend(Color, {
  brighter: function brighter(k) {
    k = k == null ? _brighter : Math.pow(_brighter, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function darker(k) {
    k = k == null ? _darker : Math.pow(_darker, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function rgb$1() {
    var h = this.h % 360 + (this.h < 0) * 360,
        s = isNaN(h) || isNaN(this.s) ? 0 : this.s,
        l = this.l,
        m2 = l + (l < 0.5 ? l : 1 - l) * s,
        m1 = 2 * l - m2;
    return new Rgb(hsl2rgb(h >= 240 ? h - 240 : h + 120, m1, m2), hsl2rgb(h, m1, m2), hsl2rgb(h < 120 ? h + 240 : h - 120, m1, m2), this.opacity);
  },
  displayable: function displayable() {
    return (0 <= this.s && this.s <= 1 || isNaN(this.s)) && 0 <= this.l && this.l <= 1 && 0 <= this.opacity && this.opacity <= 1;
  }
}));

/* From FvD 13.37, CSS Color Module Level 3 */
function hsl2rgb(h, m1, m2) {
  return (h < 60 ? m1 + (m2 - m1) * h / 60 : h < 180 ? m2 : h < 240 ? m1 + (m2 - m1) * (240 - h) / 60 : m1) * 255;
}

var deg2rad = Math.PI / 180;
var rad2deg = 180 / Math.PI;

var Kn = 18;
var Xn = 0.950470;
var Yn = 1;
var Zn = 1.088830;
var t0 = 4 / 29;
var t1 = 6 / 29;
var t2 = 3 * t1 * t1;
var t3 = t1 * t1 * t1;

function labConvert(o) {
  if (o instanceof Lab) return new Lab(o.l, o.a, o.b, o.opacity);
  if (o instanceof Hcl) {
    var h = o.h * deg2rad;
    return new Lab(o.l, Math.cos(h) * o.c, Math.sin(h) * o.c, o.opacity);
  }
  if (!(o instanceof Rgb)) o = rgbConvert(o);
  var b = rgb2xyz(o.r),
      a = rgb2xyz(o.g),
      l = rgb2xyz(o.b),
      x = xyz2lab((0.4124564 * b + 0.3575761 * a + 0.1804375 * l) / Xn),
      y = xyz2lab((0.2126729 * b + 0.7151522 * a + 0.0721750 * l) / Yn),
      z = xyz2lab((0.0193339 * b + 0.1191920 * a + 0.9503041 * l) / Zn);
  return new Lab(116 * y - 16, 500 * (x - y), 200 * (y - z), o.opacity);
}

function lab(l, a, b, opacity) {
  return arguments.length === 1 ? labConvert(l) : new Lab(l, a, b, opacity == null ? 1 : opacity);
}

function Lab(l, a, b, opacity) {
  this.l = +l;
  this.a = +a;
  this.b = +b;
  this.opacity = +opacity;
}

define(Lab, lab, extend(Color, {
  brighter: function brighter(k) {
    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  darker: function darker(k) {
    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  rgb: function rgb() {
    var y = (this.l + 16) / 116,
        x = isNaN(this.a) ? y : y + this.a / 500,
        z = isNaN(this.b) ? y : y - this.b / 200;
    y = Yn * lab2xyz(y);
    x = Xn * lab2xyz(x);
    z = Zn * lab2xyz(z);
    return new Rgb(xyz2rgb(3.2404542 * x - 1.5371385 * y - 0.4985314 * z), // D65 -> sRGB
    xyz2rgb(-0.9692660 * x + 1.8760108 * y + 0.0415560 * z), xyz2rgb(0.0556434 * x - 0.2040259 * y + 1.0572252 * z), this.opacity);
  }
}));

function xyz2lab(t) {
  return t > t3 ? Math.pow(t, 1 / 3) : t / t2 + t0;
}

function lab2xyz(t) {
  return t > t1 ? t * t * t : t2 * (t - t0);
}

function xyz2rgb(x) {
  return 255 * (x <= 0.0031308 ? 12.92 * x : 1.055 * Math.pow(x, 1 / 2.4) - 0.055);
}

function rgb2xyz(x) {
  return (x /= 255) <= 0.04045 ? x / 12.92 : Math.pow((x + 0.055) / 1.055, 2.4);
}

function hclConvert(o) {
  if (o instanceof Hcl) return new Hcl(o.h, o.c, o.l, o.opacity);
  if (!(o instanceof Lab)) o = labConvert(o);
  var h = Math.atan2(o.b, o.a) * rad2deg;
  return new Hcl(h < 0 ? h + 360 : h, Math.sqrt(o.a * o.a + o.b * o.b), o.l, o.opacity);
}

function hcl(h, c, l, opacity) {
  return arguments.length === 1 ? hclConvert(h) : new Hcl(h, c, l, opacity == null ? 1 : opacity);
}

function Hcl(h, c, l, opacity) {
  this.h = +h;
  this.c = +c;
  this.l = +l;
  this.opacity = +opacity;
}

define(Hcl, hcl, extend(Color, {
  brighter: function brighter(k) {
    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k), this.opacity);
  },
  darker: function darker(k) {
    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k), this.opacity);
  },
  rgb: function rgb() {
    return labConvert(this).rgb();
  }
}));

var A = -0.14861;
var B = +1.78277;
var C = -0.29227;
var D = -0.90649;
var E = +1.97294;
var ED = E * D;
var EB = E * B;
var BC_DA = B * C - D * A;

function cubehelixConvert(o) {
  if (o instanceof Cubehelix) return new Cubehelix(o.h, o.s, o.l, o.opacity);
  if (!(o instanceof Rgb)) o = rgbConvert(o);
  var r = o.r / 255,
      g = o.g / 255,
      b = o.b / 255,
      l = (BC_DA * b + ED * r - EB * g) / (BC_DA + ED - EB),
      bl = b - l,
      k = (E * (g - l) - C * bl) / D,
      s = Math.sqrt(k * k + bl * bl) / (E * l * (1 - l)),
      // NaN if l=0 or l=1
  h = s ? Math.atan2(k, bl) * rad2deg - 120 : NaN;
  return new Cubehelix(h < 0 ? h + 360 : h, s, l, o.opacity);
}

function cubehelix(h, s, l, opacity) {
  return arguments.length === 1 ? cubehelixConvert(h) : new Cubehelix(h, s, l, opacity == null ? 1 : opacity);
}

function Cubehelix(h, s, l, opacity) {
  this.h = +h;
  this.s = +s;
  this.l = +l;
  this.opacity = +opacity;
}

define(Cubehelix, cubehelix, extend(Color, {
  brighter: function brighter(k) {
    k = k == null ? _brighter : Math.pow(_brighter, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function darker(k) {
    k = k == null ? _darker : Math.pow(_darker, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function rgb() {
    var h = isNaN(this.h) ? 0 : (this.h + 120) * deg2rad,
        l = +this.l,
        a = isNaN(this.s) ? 0 : this.s * l * (1 - l),
        cosh = Math.cos(h),
        sinh = Math.sin(h);
    return new Rgb(255 * (l + a * (A * cosh + B * sinh)), 255 * (l + a * (C * cosh + D * sinh)), 255 * (l + a * (E * cosh)), this.opacity);
  }
}));

function basis$1(t1, v0, v1, v2, v3) {
  var t2 = t1 * t1,
      t3 = t2 * t1;
  return ((1 - 3 * t1 + 3 * t2 - t3) * v0 + (4 - 6 * t2 + 3 * t3) * v1 + (1 + 3 * t1 + 3 * t2 - 3 * t3) * v2 + t3 * v3) / 6;
}

var basis$2 = function (values) {
  var n = values.length - 1;
  return function (t) {
    var i = t <= 0 ? t = 0 : t >= 1 ? (t = 1, n - 1) : Math.floor(t * n),
        v1 = values[i],
        v2 = values[i + 1],
        v0 = i > 0 ? values[i - 1] : 2 * v1 - v2,
        v3 = i < n - 1 ? values[i + 2] : 2 * v2 - v1;
    return basis$1((t - i / n) * n, v0, v1, v2, v3);
  };
};

var basisClosed$1 = function (values) {
  var n = values.length;
  return function (t) {
    var i = Math.floor(((t %= 1) < 0 ? ++t : t) * n),
        v0 = values[(i + n - 1) % n],
        v1 = values[i % n],
        v2 = values[(i + 1) % n],
        v3 = values[(i + 2) % n];
    return basis$1((t - i / n) * n, v0, v1, v2, v3);
  };
};

var constant$3 = function (x) {
  return function () {
    return x;
  };
};

function linear$1(a, d) {
  return function (t) {
    return a + t * d;
  };
}

function exponential$1(a, b, y) {
  return a = Math.pow(a, y), b = Math.pow(b, y) - a, y = 1 / y, function (t) {
    return Math.pow(a + t * b, y);
  };
}

function hue(a, b) {
  var d = b - a;
  return d ? linear$1(a, d > 180 || d < -180 ? d - 360 * Math.round(d / 360) : d) : constant$3(isNaN(a) ? b : a);
}

function gamma(y) {
  return (y = +y) === 1 ? nogamma : function (a, b) {
    return b - a ? exponential$1(a, b, y) : constant$3(isNaN(a) ? b : a);
  };
}

function nogamma(a, b) {
  var d = b - a;
  return d ? linear$1(a, d) : constant$3(isNaN(a) ? b : a);
}

var interpolateRgb = (function rgbGamma(y) {
  var color$$1 = gamma(y);

  function rgb$$1(start, end) {
    var r = color$$1((start = rgb$1(start)).r, (end = rgb$1(end)).r),
        g = color$$1(start.g, end.g),
        b = color$$1(start.b, end.b),
        opacity = color$$1(start.opacity, end.opacity);
    return function (t) {
      start.r = r(t);
      start.g = g(t);
      start.b = b(t);
      start.opacity = opacity(t);
      return start + "";
    };
  }

  rgb$$1.gamma = rgbGamma;

  return rgb$$1;
})(1);

function rgbSpline(spline) {
  return function (colors) {
    var n = colors.length,
        r = new Array(n),
        g = new Array(n),
        b = new Array(n),
        i,
        color$$1;
    for (i = 0; i < n; ++i) {
      color$$1 = rgb$1(colors[i]);
      r[i] = color$$1.r || 0;
      g[i] = color$$1.g || 0;
      b[i] = color$$1.b || 0;
    }
    r = spline(r);
    g = spline(g);
    b = spline(b);
    color$$1.opacity = 1;
    return function (t) {
      color$$1.r = r(t);
      color$$1.g = g(t);
      color$$1.b = b(t);
      return color$$1 + "";
    };
  };
}

var rgbBasis = rgbSpline(basis$2);
var rgbBasisClosed = rgbSpline(basisClosed$1);

var array$1 = function (a, b) {
  var nb = b ? b.length : 0,
      na = a ? Math.min(nb, a.length) : 0,
      x = new Array(nb),
      c = new Array(nb),
      i;

  for (i = 0; i < na; ++i) {
    x[i] = interpolate(a[i], b[i]);
  }for (; i < nb; ++i) {
    c[i] = b[i];
  }return function (t) {
    for (i = 0; i < na; ++i) {
      c[i] = x[i](t);
    }return c;
  };
};

var date = function (a, b) {
  var d = new Date();
  return a = +a, b -= a, function (t) {
    return d.setTime(a + b * t), d;
  };
};

var interpolateNumber = function (a, b) {
  return a = +a, b -= a, function (t) {
    return a + b * t;
  };
};

var _typeof = typeof Symbol === "function" && typeof Symbol.iterator === "symbol" ? function (obj) {
  return typeof obj;
} : function (obj) {
  return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj;
};





















var get$1 = function get$1(object, property, receiver) {
  if (object === null) object = Function.prototype;
  var desc = Object.getOwnPropertyDescriptor(object, property);

  if (desc === undefined) {
    var parent = Object.getPrototypeOf(object);

    if (parent === null) {
      return undefined;
    } else {
      return get$1(parent, property, receiver);
    }
  } else if ("value" in desc) {
    return desc.value;
  } else {
    var getter = desc.get;

    if (getter === undefined) {
      return undefined;
    }

    return getter.call(receiver);
  }
};

















var set$3 = function set$3(object, property, value, receiver) {
  var desc = Object.getOwnPropertyDescriptor(object, property);

  if (desc === undefined) {
    var parent = Object.getPrototypeOf(object);

    if (parent !== null) {
      set$3(parent, property, value, receiver);
    }
  } else if ("value" in desc && desc.writable) {
    desc.value = value;
  } else {
    var setter = desc.set;

    if (setter !== undefined) {
      setter.call(receiver, value);
    }
  }

  return value;
};

var object$1 = function (a, b) {
  var i = {},
      c = {},
      k;

  if (a === null || (typeof a === "undefined" ? "undefined" : _typeof(a)) !== "object") a = {};
  if (b === null || (typeof b === "undefined" ? "undefined" : _typeof(b)) !== "object") b = {};

  for (k in b) {
    if (k in a) {
      i[k] = interpolate(a[k], b[k]);
    } else {
      c[k] = b[k];
    }
  }

  return function (t) {
    for (k in i) {
      c[k] = i[k](t);
    }return c;
  };
};

var reA = /[-+]?(?:\d+\.?\d*|\.?\d+)(?:[eE][-+]?\d+)?/g;
var reB = new RegExp(reA.source, "g");

function zero(b) {
  return function () {
    return b;
  };
}

function one(b) {
  return function (t) {
    return b(t) + "";
  };
}

var interpolateString = function (a, b) {
  var bi = reA.lastIndex = reB.lastIndex = 0,
      // scan index for next number in b
  am,
      // current match in a
  bm,
      // current match in b
  bs,
      // string preceding current number in b, if any
  i = -1,
      // index in s
  s = [],
      // string constants and placeholders
  q = []; // number interpolators

  // Coerce inputs to strings.
  a = a + "", b = b + "";

  // Interpolate pairs of numbers in a & b.
  while ((am = reA.exec(a)) && (bm = reB.exec(b))) {
    if ((bs = bm.index) > bi) {
      // a string precedes the next number in b
      bs = b.slice(bi, bs);
      if (s[i]) s[i] += bs; // coalesce with previous string
      else s[++i] = bs;
    }
    if ((am = am[0]) === (bm = bm[0])) {
      // numbers in a & b match
      if (s[i]) s[i] += bm; // coalesce with previous string
      else s[++i] = bm;
    } else {
      // interpolate non-matching numbers
      s[++i] = null;
      q.push({ i: i, x: interpolateNumber(am, bm) });
    }
    bi = reB.lastIndex;
  }

  // Add remains of b.
  if (bi < b.length) {
    bs = b.slice(bi);
    if (s[i]) s[i] += bs; // coalesce with previous string
    else s[++i] = bs;
  }

  // Special optimization for only a single match.
  // Otherwise, interpolate each of the numbers and rejoin the string.
  return s.length < 2 ? q[0] ? one(q[0].x) : zero(b) : (b = q.length, function (t) {
    for (var i = 0, o; i < b; ++i) {
      s[(o = q[i]).i] = o.x(t);
    }return s.join("");
  });
};

var interpolate = function (a, b) {
    var t = typeof b === "undefined" ? "undefined" : _typeof(b),
        c;
    return b == null || t === "boolean" ? constant$3(b) : (t === "number" ? interpolateNumber : t === "string" ? (c = color(b)) ? (b = c, interpolateRgb) : interpolateString : b instanceof color ? interpolateRgb : b instanceof Date ? date : Array.isArray(b) ? array$1 : isNaN(b) ? object$1 : interpolateNumber)(a, b);
};

var interpolateRound = function (a, b) {
  return a = +a, b -= a, function (t) {
    return Math.round(a + b * t);
  };
};

var degrees = 180 / Math.PI;

var identity$2 = {
  translateX: 0,
  translateY: 0,
  rotate: 0,
  skewX: 0,
  scaleX: 1,
  scaleY: 1
};

var decompose = function (a, b, c, d, e, f) {
  var scaleX, scaleY, skewX;
  if (scaleX = Math.sqrt(a * a + b * b)) a /= scaleX, b /= scaleX;
  if (skewX = a * c + b * d) c -= a * skewX, d -= b * skewX;
  if (scaleY = Math.sqrt(c * c + d * d)) c /= scaleY, d /= scaleY, skewX /= scaleY;
  if (a * d < b * c) a = -a, b = -b, skewX = -skewX, scaleX = -scaleX;
  return {
    translateX: e,
    translateY: f,
    rotate: Math.atan2(b, a) * degrees,
    skewX: Math.atan(skewX) * degrees,
    scaleX: scaleX,
    scaleY: scaleY
  };
};

var cssNode;
var cssRoot;
var cssView;
var svgNode;

function parseCss(value) {
  if (value === "none") return identity$2;
  if (!cssNode) cssNode = document.createElement("DIV"), cssRoot = document.documentElement, cssView = document.defaultView;
  cssNode.style.transform = value;
  value = cssView.getComputedStyle(cssRoot.appendChild(cssNode), null).getPropertyValue("transform");
  cssRoot.removeChild(cssNode);
  value = value.slice(7, -1).split(",");
  return decompose(+value[0], +value[1], +value[2], +value[3], +value[4], +value[5]);
}

function parseSvg(value) {
  if (value == null) return identity$2;
  if (!svgNode) svgNode = document.createElementNS("http://www.w3.org/2000/svg", "g");
  svgNode.setAttribute("transform", value);
  if (!(value = svgNode.transform.baseVal.consolidate())) return identity$2;
  value = value.matrix;
  return decompose(value.a, value.b, value.c, value.d, value.e, value.f);
}

function interpolateTransform(parse, pxComma, pxParen, degParen) {

  function pop(s) {
    return s.length ? s.pop() + " " : "";
  }

  function translate(xa, ya, xb, yb, s, q) {
    if (xa !== xb || ya !== yb) {
      var i = s.push("translate(", null, pxComma, null, pxParen);
      q.push({ i: i - 4, x: interpolateNumber(xa, xb) }, { i: i - 2, x: interpolateNumber(ya, yb) });
    } else if (xb || yb) {
      s.push("translate(" + xb + pxComma + yb + pxParen);
    }
  }

  function rotate(a, b, s, q) {
    if (a !== b) {
      if (a - b > 180) b += 360;else if (b - a > 180) a += 360; // shortest path
      q.push({ i: s.push(pop(s) + "rotate(", null, degParen) - 2, x: interpolateNumber(a, b) });
    } else if (b) {
      s.push(pop(s) + "rotate(" + b + degParen);
    }
  }

  function skewX(a, b, s, q) {
    if (a !== b) {
      q.push({ i: s.push(pop(s) + "skewX(", null, degParen) - 2, x: interpolateNumber(a, b) });
    } else if (b) {
      s.push(pop(s) + "skewX(" + b + degParen);
    }
  }

  function scale(xa, ya, xb, yb, s, q) {
    if (xa !== xb || ya !== yb) {
      var i = s.push(pop(s) + "scale(", null, ",", null, ")");
      q.push({ i: i - 4, x: interpolateNumber(xa, xb) }, { i: i - 2, x: interpolateNumber(ya, yb) });
    } else if (xb !== 1 || yb !== 1) {
      s.push(pop(s) + "scale(" + xb + "," + yb + ")");
    }
  }

  return function (a, b) {
    var s = [],
        // string constants and placeholders
    q = []; // number interpolators
    a = parse(a), b = parse(b);
    translate(a.translateX, a.translateY, b.translateX, b.translateY, s, q);
    rotate(a.rotate, b.rotate, s, q);
    skewX(a.skewX, b.skewX, s, q);
    scale(a.scaleX, a.scaleY, b.scaleX, b.scaleY, s, q);
    a = b = null; // gc
    return function (t) {
      var i = -1,
          n = q.length,
          o;
      while (++i < n) {
        s[(o = q[i]).i] = o.x(t);
      }return s.join("");
    };
  };
}

var interpolateTransformCss = interpolateTransform(parseCss, "px, ", "px)", "deg)");
var interpolateTransformSvg = interpolateTransform(parseSvg, ", ", ")", ")");

var rho = Math.SQRT2;
var rho2 = 2;
var rho4 = 4;
var epsilon2 = 1e-12;

function cosh(x) {
  return ((x = Math.exp(x)) + 1 / x) / 2;
}

function sinh(x) {
  return ((x = Math.exp(x)) - 1 / x) / 2;
}

function tanh(x) {
  return ((x = Math.exp(2 * x)) - 1) / (x + 1);
}

// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]
var interpolateZoom = function (p0, p1) {
  var ux0 = p0[0],
      uy0 = p0[1],
      w0 = p0[2],
      ux1 = p1[0],
      uy1 = p1[1],
      w1 = p1[2],
      dx = ux1 - ux0,
      dy = uy1 - uy0,
      d2 = dx * dx + dy * dy,
      i,
      S;

  // Special case for u0 ≅ u1.
  if (d2 < epsilon2) {
    S = Math.log(w1 / w0) / rho;
    i = function i(t) {
      return [ux0 + t * dx, uy0 + t * dy, w0 * Math.exp(rho * t * S)];
    };
  }

  // General case.
  else {
      var d1 = Math.sqrt(d2),
          b0 = (w1 * w1 - w0 * w0 + rho4 * d2) / (2 * w0 * rho2 * d1),
          b1 = (w1 * w1 - w0 * w0 - rho4 * d2) / (2 * w1 * rho2 * d1),
          r0 = Math.log(Math.sqrt(b0 * b0 + 1) - b0),
          r1 = Math.log(Math.sqrt(b1 * b1 + 1) - b1);
      S = (r1 - r0) / rho;
      i = function i(t) {
        var s = t * S,
            coshr0 = cosh(r0),
            u = w0 / (rho2 * d1) * (coshr0 * tanh(rho * s + r0) - sinh(r0));
        return [ux0 + u * dx, uy0 + u * dy, w0 * coshr0 / cosh(rho * s + r0)];
      };
    }

  i.duration = S * 1000;

  return i;
};

function hsl$1(hue$$1) {
  return function (start, end) {
    var h = hue$$1((start = hsl(start)).h, (end = hsl(end)).h),
        s = nogamma(start.s, end.s),
        l = nogamma(start.l, end.l),
        opacity = nogamma(start.opacity, end.opacity);
    return function (t) {
      start.h = h(t);
      start.s = s(t);
      start.l = l(t);
      start.opacity = opacity(t);
      return start + "";
    };
  };
}

var hsl$2 = hsl$1(hue);
var hslLong = hsl$1(nogamma);

function lab$1(start, end) {
  var l = nogamma((start = lab(start)).l, (end = lab(end)).l),
      a = nogamma(start.a, end.a),
      b = nogamma(start.b, end.b),
      opacity = nogamma(start.opacity, end.opacity);
  return function (t) {
    start.l = l(t);
    start.a = a(t);
    start.b = b(t);
    start.opacity = opacity(t);
    return start + "";
  };
}

function hcl$1(hue$$1) {
  return function (start, end) {
    var h = hue$$1((start = hcl(start)).h, (end = hcl(end)).h),
        c = nogamma(start.c, end.c),
        l = nogamma(start.l, end.l),
        opacity = nogamma(start.opacity, end.opacity);
    return function (t) {
      start.h = h(t);
      start.c = c(t);
      start.l = l(t);
      start.opacity = opacity(t);
      return start + "";
    };
  };
}

var hcl$2 = hcl$1(hue);
var hclLong = hcl$1(nogamma);

function cubehelix$1(hue$$1) {
  return function cubehelixGamma(y) {
    y = +y;

    function cubehelix$$1(start, end) {
      var h = hue$$1((start = cubehelix(start)).h, (end = cubehelix(end)).h),
          s = nogamma(start.s, end.s),
          l = nogamma(start.l, end.l),
          opacity = nogamma(start.opacity, end.opacity);
      return function (t) {
        start.h = h(t);
        start.s = s(t);
        start.l = l(Math.pow(t, y));
        start.opacity = opacity(t);
        return start + "";
      };
    }

    cubehelix$$1.gamma = cubehelixGamma;

    return cubehelix$$1;
  }(1);
}

var cubehelix$2 = cubehelix$1(hue);
var cubehelixLong = cubehelix$1(nogamma);

var quantize = function (interpolator, n) {
  var samples = new Array(n);
  for (var i = 0; i < n; ++i) {
    samples[i] = interpolator(i / (n - 1));
  }return samples;
};

var noop$1 = { value: function value() {} };

function dispatch() {
  for (var i = 0, n = arguments.length, _ = {}, t; i < n; ++i) {
    if (!(t = arguments[i] + "") || t in _) throw new Error("illegal type: " + t);
    _[t] = [];
  }
  return new Dispatch(_);
}

function Dispatch(_) {
  this._ = _;
}

function parseTypenames(typenames, types) {
  return typenames.trim().split(/^|\s+/).map(function (t) {
    var name = "",
        i = t.indexOf(".");
    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
    if (t && !types.hasOwnProperty(t)) throw new Error("unknown type: " + t);
    return { type: t, name: name };
  });
}

Dispatch.prototype = dispatch.prototype = {
  constructor: Dispatch,
  on: function on(typename, callback) {
    var _ = this._,
        T = parseTypenames(typename + "", _),
        t,
        i = -1,
        n = T.length;

    // If no callback was specified, return the callback of the given type and name.
    if (arguments.length < 2) {
      while (++i < n) {
        if ((t = (typename = T[i]).type) && (t = get$2(_[t], typename.name))) return t;
      }return;
    }

    // If a type was specified, set the callback for the given type and name.
    // Otherwise, if a null callback was specified, remove callbacks of the given name.
    if (callback != null && typeof callback !== "function") throw new Error("invalid callback: " + callback);
    while (++i < n) {
      if (t = (typename = T[i]).type) _[t] = set$4(_[t], typename.name, callback);else if (callback == null) for (t in _) {
        _[t] = set$4(_[t], typename.name, null);
      }
    }

    return this;
  },
  copy: function copy() {
    var copy = {},
        _ = this._;
    for (var t in _) {
      copy[t] = _[t].slice();
    }return new Dispatch(copy);
  },
  call: function call(type, that) {
    if ((n = arguments.length - 2) > 0) for (var args = new Array(n), i = 0, n, t; i < n; ++i) {
      args[i] = arguments[i + 2];
    }if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
    for (t = this._[type], i = 0, n = t.length; i < n; ++i) {
      t[i].value.apply(that, args);
    }
  },
  apply: function apply(type, that, args) {
    if (!this._.hasOwnProperty(type)) throw new Error("unknown type: " + type);
    for (var t = this._[type], i = 0, n = t.length; i < n; ++i) {
      t[i].value.apply(that, args);
    }
  }
};

function get$2(type, name) {
  for (var i = 0, n = type.length, c; i < n; ++i) {
    if ((c = type[i]).name === name) {
      return c.value;
    }
  }
}

function set$4(type, name, callback) {
  for (var i = 0, n = type.length; i < n; ++i) {
    if (type[i].name === name) {
      type[i] = noop$1, type = type.slice(0, i).concat(type.slice(i + 1));
      break;
    }
  }
  if (callback != null) type.push({ name: name, value: callback });
  return type;
}

function objectConverter(columns) {
  return new Function("d", "return {" + columns.map(function (name, i) {
    return JSON.stringify(name) + ": d[" + i + "]";
  }).join(",") + "}");
}

function customConverter(columns, f) {
  var object = objectConverter(columns);
  return function (row, i) {
    return f(object(row), i, columns);
  };
}

// Compute unique columns in order of discovery.
function inferColumns(rows) {
  var columnSet = Object.create(null),
      columns = [];

  rows.forEach(function (row) {
    for (var column in row) {
      if (!(column in columnSet)) {
        columns.push(columnSet[column] = column);
      }
    }
  });

  return columns;
}

var dsv = function (delimiter) {
  var reFormat = new RegExp("[\"" + delimiter + "\n]"),
      delimiterCode = delimiter.charCodeAt(0);

  function parse(text, f) {
    var convert,
        columns,
        rows = parseRows(text, function (row, i) {
      if (convert) return convert(row, i - 1);
      columns = row, convert = f ? customConverter(row, f) : objectConverter(row);
    });
    rows.columns = columns;
    return rows;
  }

  function parseRows(text, f) {
    var EOL = {},
        // sentinel value for end-of-line
    EOF = {},
        // sentinel value for end-of-file
    rows = [],
        // output rows
    N = text.length,
        I = 0,
        // current character index
    n = 0,
        // the current line number
    t,
        // the current token
    eol; // is the current token followed by EOL?

    function token() {
      if (I >= N) return EOF; // special case: end of file
      if (eol) return eol = false, EOL; // special case: end of line

      // special case: quotes
      var j = I,
          c;
      if (text.charCodeAt(j) === 34) {
        var i = j;
        while (i++ < N) {
          if (text.charCodeAt(i) === 34) {
            if (text.charCodeAt(i + 1) !== 34) break;
            ++i;
          }
        }
        I = i + 2;
        c = text.charCodeAt(i + 1);
        if (c === 13) {
          eol = true;
          if (text.charCodeAt(i + 2) === 10) ++I;
        } else if (c === 10) {
          eol = true;
        }
        return text.slice(j + 1, i).replace(/""/g, "\"");
      }

      // common case: find next delimiter or newline
      while (I < N) {
        var k = 1;
        c = text.charCodeAt(I++);
        if (c === 10) eol = true; // \n
        else if (c === 13) {
            eol = true;if (text.charCodeAt(I) === 10) ++I, ++k;
          } // \r|\r\n
          else if (c !== delimiterCode) continue;
        return text.slice(j, I - k);
      }

      // special case: last token before EOF
      return text.slice(j);
    }

    while ((t = token()) !== EOF) {
      var a = [];
      while (t !== EOL && t !== EOF) {
        a.push(t);
        t = token();
      }
      if (f && (a = f(a, n++)) == null) continue;
      rows.push(a);
    }

    return rows;
  }

  function format(rows, columns) {
    if (columns == null) columns = inferColumns(rows);
    return [columns.map(formatValue).join(delimiter)].concat(rows.map(function (row) {
      return columns.map(function (column) {
        return formatValue(row[column]);
      }).join(delimiter);
    })).join("\n");
  }

  function formatRows(rows) {
    return rows.map(formatRow).join("\n");
  }

  function formatRow(row) {
    return row.map(formatValue).join(delimiter);
  }

  function formatValue(text) {
    return text == null ? "" : reFormat.test(text += "") ? "\"" + text.replace(/\"/g, "\"\"") + "\"" : text;
  }

  return {
    parse: parse,
    parseRows: parseRows,
    format: format,
    formatRows: formatRows
  };
};

var csv = dsv(",");

var csvParse = csv.parse;
var csvParseRows = csv.parseRows;
var csvFormat = csv.format;
var csvFormatRows = csv.formatRows;

var tsv = dsv("\t");

var tsvParse = tsv.parse;
var tsvParseRows = tsv.parseRows;
var tsvFormat = tsv.format;
var tsvFormatRows = tsv.formatRows;

var frame = 0;
var timeout = 0;
var interval = 0;
var pokeDelay = 1000;
var taskHead;
var taskTail;
var clockLast = 0;
var clockNow = 0;
var clockSkew = 0;
var clock = (typeof performance === "undefined" ? "undefined" : _typeof(performance)) === "object" && performance.now ? performance : Date;
var setFrame = typeof requestAnimationFrame === "function" ? requestAnimationFrame : function (f) {
  setTimeout(f, 17);
};

function now() {
  return clockNow || (setFrame(clearNow), clockNow = clock.now() + clockSkew);
}

function clearNow() {
  clockNow = 0;
}

function Timer() {
  this._call = this._time = this._next = null;
}

Timer.prototype = timer.prototype = {
  constructor: Timer,
  restart: function restart(callback, delay, time) {
    if (typeof callback !== "function") throw new TypeError("callback is not a function");
    time = (time == null ? now() : +time) + (delay == null ? 0 : +delay);
    if (!this._next && taskTail !== this) {
      if (taskTail) taskTail._next = this;else taskHead = this;
      taskTail = this;
    }
    this._call = callback;
    this._time = time;
    sleep();
  },
  stop: function stop() {
    if (this._call) {
      this._call = null;
      this._time = Infinity;
      sleep();
    }
  }
};

function timer(callback, delay, time) {
  var t = new Timer();
  t.restart(callback, delay, time);
  return t;
}

function timerFlush() {
  now(); // Get the current time, if not already set.
  ++frame; // Pretend we’ve set an alarm, if we haven’t already.
  var t = taskHead,
      e;
  while (t) {
    if ((e = clockNow - t._time) >= 0) t._call.call(null, e);
    t = t._next;
  }
  --frame;
}

function wake() {
  clockNow = (clockLast = clock.now()) + clockSkew;
  frame = timeout = 0;
  try {
    timerFlush();
  } finally {
    frame = 0;
    nap();
    clockNow = 0;
  }
}

function poke() {
  var now = clock.now(),
      delay = now - clockLast;
  if (delay > pokeDelay) clockSkew -= delay, clockLast = now;
}

function nap() {
  var t0,
      t1 = taskHead,
      t2,
      time = Infinity;
  while (t1) {
    if (t1._call) {
      if (time > t1._time) time = t1._time;
      t0 = t1, t1 = t1._next;
    } else {
      t2 = t1._next, t1._next = null;
      t1 = t0 ? t0._next = t2 : taskHead = t2;
    }
  }
  taskTail = t0;
  sleep(time);
}

function sleep(time) {
  if (frame) return; // Soonest alarm already set, or will be.
  if (timeout) timeout = clearTimeout(timeout);
  var delay = time - clockNow;
  if (delay > 24) {
    if (time < Infinity) timeout = setTimeout(wake, delay);
    if (interval) interval = clearInterval(interval);
  } else {
    if (!interval) interval = setInterval(poke, pokeDelay);
    frame = 1, setFrame(wake);
  }
}

var timeout$1 = function (callback, delay, time) {
  var t = new Timer();
  delay = delay == null ? 0 : +delay;
  t.restart(function (elapsed) {
    t.stop();
    callback(elapsed + delay);
  }, delay, time);
  return t;
};

var interval$1 = function (callback, delay, time) {
  var t = new Timer(),
      total = delay;
  if (delay == null) return t.restart(callback, delay, time), t;
  delay = +delay, time = time == null ? now() : +time;
  t.restart(function tick(elapsed) {
    elapsed += total;
    t.restart(tick, total += delay, time);
    callback(elapsed);
  }, delay, time);
  return t;
};

var t0$1 = new Date();
var t1$1 = new Date();

function newInterval(floori, offseti, count, field) {

  function interval(date) {
    return floori(date = new Date(+date)), date;
  }

  interval.floor = interval;

  interval.ceil = function (date) {
    return floori(date = new Date(date - 1)), offseti(date, 1), floori(date), date;
  };

  interval.round = function (date) {
    var d0 = interval(date),
        d1 = interval.ceil(date);
    return date - d0 < d1 - date ? d0 : d1;
  };

  interval.offset = function (date, step) {
    return offseti(date = new Date(+date), step == null ? 1 : Math.floor(step)), date;
  };

  interval.range = function (start, stop, step) {
    var range = [];
    start = interval.ceil(start);
    step = step == null ? 1 : Math.floor(step);
    if (!(start < stop) || !(step > 0)) return range; // also handles Invalid Date
    do {
      range.push(new Date(+start));
    } while ((offseti(start, step), floori(start), start < stop));
    return range;
  };

  interval.filter = function (test) {
    return newInterval(function (date) {
      if (date >= date) while (floori(date), !test(date)) {
        date.setTime(date - 1);
      }
    }, function (date, step) {
      if (date >= date) while (--step >= 0) {
        while (offseti(date, 1), !test(date)) {}
      } // eslint-disable-line no-empty
    });
  };

  if (count) {
    interval.count = function (start, end) {
      t0$1.setTime(+start), t1$1.setTime(+end);
      floori(t0$1), floori(t1$1);
      return Math.floor(count(t0$1, t1$1));
    };

    interval.every = function (step) {
      step = Math.floor(step);
      return !isFinite(step) || !(step > 0) ? null : !(step > 1) ? interval : interval.filter(field ? function (d) {
        return field(d) % step === 0;
      } : function (d) {
        return interval.count(0, d) % step === 0;
      });
    };
  }

  return interval;
}

var millisecond = newInterval(function () {
  // noop
}, function (date, step) {
  date.setTime(+date + step);
}, function (start, end) {
  return end - start;
});

// An optimized implementation for this simple case.
millisecond.every = function (k) {
  k = Math.floor(k);
  if (!isFinite(k) || !(k > 0)) return null;
  if (!(k > 1)) return millisecond;
  return newInterval(function (date) {
    date.setTime(Math.floor(date / k) * k);
  }, function (date, step) {
    date.setTime(+date + step * k);
  }, function (start, end) {
    return (end - start) / k;
  });
};

var milliseconds = millisecond.range;

var durationSecond = 1e3;
var durationMinute = 6e4;
var durationHour = 36e5;
var durationDay = 864e5;
var durationWeek = 6048e5;

var second = newInterval(function (date) {
  date.setTime(Math.floor(date / durationSecond) * durationSecond);
}, function (date, step) {
  date.setTime(+date + step * durationSecond);
}, function (start, end) {
  return (end - start) / durationSecond;
}, function (date) {
  return date.getUTCSeconds();
});

var seconds = second.range;

var minute = newInterval(function (date) {
  date.setTime(Math.floor(date / durationMinute) * durationMinute);
}, function (date, step) {
  date.setTime(+date + step * durationMinute);
}, function (start, end) {
  return (end - start) / durationMinute;
}, function (date) {
  return date.getMinutes();
});

var minutes = minute.range;

var hour = newInterval(function (date) {
  var offset = date.getTimezoneOffset() * durationMinute % durationHour;
  if (offset < 0) offset += durationHour;
  date.setTime(Math.floor((+date - offset) / durationHour) * durationHour + offset);
}, function (date, step) {
  date.setTime(+date + step * durationHour);
}, function (start, end) {
  return (end - start) / durationHour;
}, function (date) {
  return date.getHours();
});

var hours = hour.range;

var day = newInterval(function (date) {
  date.setHours(0, 0, 0, 0);
}, function (date, step) {
  date.setDate(date.getDate() + step);
}, function (start, end) {
  return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationDay;
}, function (date) {
  return date.getDate() - 1;
});

var days = day.range;

function weekday(i) {
  return newInterval(function (date) {
    date.setDate(date.getDate() - (date.getDay() + 7 - i) % 7);
    date.setHours(0, 0, 0, 0);
  }, function (date, step) {
    date.setDate(date.getDate() + step * 7);
  }, function (start, end) {
    return (end - start - (end.getTimezoneOffset() - start.getTimezoneOffset()) * durationMinute) / durationWeek;
  });
}

var sunday = weekday(0);
var monday = weekday(1);
var tuesday = weekday(2);
var wednesday = weekday(3);
var thursday = weekday(4);
var friday = weekday(5);
var saturday = weekday(6);

var sundays = sunday.range;
var mondays = monday.range;
var tuesdays = tuesday.range;
var wednesdays = wednesday.range;
var thursdays = thursday.range;
var fridays = friday.range;
var saturdays = saturday.range;

var month = newInterval(function (date) {
  date.setDate(1);
  date.setHours(0, 0, 0, 0);
}, function (date, step) {
  date.setMonth(date.getMonth() + step);
}, function (start, end) {
  return end.getMonth() - start.getMonth() + (end.getFullYear() - start.getFullYear()) * 12;
}, function (date) {
  return date.getMonth();
});

var months = month.range;

var year = newInterval(function (date) {
  date.setMonth(0, 1);
  date.setHours(0, 0, 0, 0);
}, function (date, step) {
  date.setFullYear(date.getFullYear() + step);
}, function (start, end) {
  return end.getFullYear() - start.getFullYear();
}, function (date) {
  return date.getFullYear();
});

// An optimized implementation for this simple case.
year.every = function (k) {
  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function (date) {
    date.setFullYear(Math.floor(date.getFullYear() / k) * k);
    date.setMonth(0, 1);
    date.setHours(0, 0, 0, 0);
  }, function (date, step) {
    date.setFullYear(date.getFullYear() + step * k);
  });
};

var years = year.range;

var utcMinute = newInterval(function (date) {
  date.setUTCSeconds(0, 0);
}, function (date, step) {
  date.setTime(+date + step * durationMinute);
}, function (start, end) {
  return (end - start) / durationMinute;
}, function (date) {
  return date.getUTCMinutes();
});

var utcMinutes = utcMinute.range;

var utcHour = newInterval(function (date) {
  date.setUTCMinutes(0, 0, 0);
}, function (date, step) {
  date.setTime(+date + step * durationHour);
}, function (start, end) {
  return (end - start) / durationHour;
}, function (date) {
  return date.getUTCHours();
});

var utcHours = utcHour.range;

var utcDay = newInterval(function (date) {
  date.setUTCHours(0, 0, 0, 0);
}, function (date, step) {
  date.setUTCDate(date.getUTCDate() + step);
}, function (start, end) {
  return (end - start) / durationDay;
}, function (date) {
  return date.getUTCDate() - 1;
});

var utcDays = utcDay.range;

function utcWeekday(i) {
  return newInterval(function (date) {
    date.setUTCDate(date.getUTCDate() - (date.getUTCDay() + 7 - i) % 7);
    date.setUTCHours(0, 0, 0, 0);
  }, function (date, step) {
    date.setUTCDate(date.getUTCDate() + step * 7);
  }, function (start, end) {
    return (end - start) / durationWeek;
  });
}

var utcSunday = utcWeekday(0);
var utcMonday = utcWeekday(1);
var utcTuesday = utcWeekday(2);
var utcWednesday = utcWeekday(3);
var utcThursday = utcWeekday(4);
var utcFriday = utcWeekday(5);
var utcSaturday = utcWeekday(6);

var utcSundays = utcSunday.range;
var utcMondays = utcMonday.range;
var utcTuesdays = utcTuesday.range;
var utcWednesdays = utcWednesday.range;
var utcThursdays = utcThursday.range;
var utcFridays = utcFriday.range;
var utcSaturdays = utcSaturday.range;

var utcMonth = newInterval(function (date) {
  date.setUTCDate(1);
  date.setUTCHours(0, 0, 0, 0);
}, function (date, step) {
  date.setUTCMonth(date.getUTCMonth() + step);
}, function (start, end) {
  return end.getUTCMonth() - start.getUTCMonth() + (end.getUTCFullYear() - start.getUTCFullYear()) * 12;
}, function (date) {
  return date.getUTCMonth();
});

var utcMonths = utcMonth.range;

var utcYear = newInterval(function (date) {
  date.setUTCMonth(0, 1);
  date.setUTCHours(0, 0, 0, 0);
}, function (date, step) {
  date.setUTCFullYear(date.getUTCFullYear() + step);
}, function (start, end) {
  return end.getUTCFullYear() - start.getUTCFullYear();
}, function (date) {
  return date.getUTCFullYear();
});

// An optimized implementation for this simple case.
utcYear.every = function (k) {
  return !isFinite(k = Math.floor(k)) || !(k > 0) ? null : newInterval(function (date) {
    date.setUTCFullYear(Math.floor(date.getUTCFullYear() / k) * k);
    date.setUTCMonth(0, 1);
    date.setUTCHours(0, 0, 0, 0);
  }, function (date, step) {
    date.setUTCFullYear(date.getUTCFullYear() + step * k);
  });
};

var utcYears = utcYear.range;

// Computes the decimal coefficient and exponent of the specified number x with
// significant digits p, where x is positive and p is in [1, 21] or undefined.
// For example, formatDecimal(1.23) returns ["123", 0].
var formatDecimal = function (x, p) {
  if ((i = (x = p ? x.toExponential(p - 1) : x.toExponential()).indexOf("e")) < 0) return null; // NaN, ±Infinity
  var i,
      coefficient = x.slice(0, i);

  // The string returned by toExponential either has the form \d\.\d+e[-+]\d+
  // (e.g., 1.2e+3) or the form \de[-+]\d+ (e.g., 1e+3).
  return [coefficient.length > 1 ? coefficient[0] + coefficient.slice(2) : coefficient, +x.slice(i + 1)];
};

var exponent$1 = function (x) {
  return x = formatDecimal(Math.abs(x)), x ? x[1] : NaN;
};

var formatGroup = function (grouping, thousands) {
  return function (value, width) {
    var i = value.length,
        t = [],
        j = 0,
        g = grouping[0],
        length = 0;

    while (i > 0 && g > 0) {
      if (length + g + 1 > width) g = Math.max(1, width - length);
      t.push(value.substring(i -= g, i + g));
      if ((length += g + 1) > width) break;
      g = grouping[j = (j + 1) % grouping.length];
    }

    return t.reverse().join(thousands);
  };
};

var formatDefault = function (x, p) {
  x = x.toPrecision(p);

  out: for (var n = x.length, i = 1, i0 = -1, i1; i < n; ++i) {
    switch (x[i]) {
      case ".":
        i0 = i1 = i;break;
      case "0":
        if (i0 === 0) i0 = i;i1 = i;break;
      case "e":
        break out;
      default:
        if (i0 > 0) i0 = 0;break;
    }
  }

  return i0 > 0 ? x.slice(0, i0) + x.slice(i1 + 1) : x;
};

var prefixExponent;

var formatPrefixAuto = function (x, p) {
    var d = formatDecimal(x, p);
    if (!d) return x + "";
    var coefficient = d[0],
        exponent = d[1],
        i = exponent - (prefixExponent = Math.max(-8, Math.min(8, Math.floor(exponent / 3))) * 3) + 1,
        n = coefficient.length;
    return i === n ? coefficient : i > n ? coefficient + new Array(i - n + 1).join("0") : i > 0 ? coefficient.slice(0, i) + "." + coefficient.slice(i) : "0." + new Array(1 - i).join("0") + formatDecimal(x, Math.max(0, p + i - 1))[0]; // less than 1y!
};

var formatRounded = function (x, p) {
    var d = formatDecimal(x, p);
    if (!d) return x + "";
    var coefficient = d[0],
        exponent = d[1];
    return exponent < 0 ? "0." + new Array(-exponent).join("0") + coefficient : coefficient.length > exponent + 1 ? coefficient.slice(0, exponent + 1) + "." + coefficient.slice(exponent + 1) : coefficient + new Array(exponent - coefficient.length + 2).join("0");
};

var formatTypes = {
  "": formatDefault,
  "%": function _(x, p) {
    return (x * 100).toFixed(p);
  },
  "b": function b(x) {
    return Math.round(x).toString(2);
  },
  "c": function c(x) {
    return x + "";
  },
  "d": function d(x) {
    return Math.round(x).toString(10);
  },
  "e": function e(x, p) {
    return x.toExponential(p);
  },
  "f": function f(x, p) {
    return x.toFixed(p);
  },
  "g": function g(x, p) {
    return x.toPrecision(p);
  },
  "o": function o(x) {
    return Math.round(x).toString(8);
  },
  "p": function p(x, _p) {
    return formatRounded(x * 100, _p);
  },
  "r": formatRounded,
  "s": formatPrefixAuto,
  "X": function X(x) {
    return Math.round(x).toString(16).toUpperCase();
  },
  "x": function x(_x) {
    return Math.round(_x).toString(16);
  }
};

// [[fill]align][sign][symbol][0][width][,][.precision][type]
var re = /^(?:(.)?([<>=^]))?([+\-\( ])?([$#])?(0)?(\d+)?(,)?(\.\d+)?([a-z%])?$/i;

var formatSpecifier = function (specifier) {
  return new FormatSpecifier(specifier);
};

function FormatSpecifier(specifier) {
  if (!(match = re.exec(specifier))) throw new Error("invalid format: " + specifier);

  var match,
      fill = match[1] || " ",
      align = match[2] || ">",
      sign = match[3] || "-",
      symbol = match[4] || "",
      zero = !!match[5],
      width = match[6] && +match[6],
      comma = !!match[7],
      precision = match[8] && +match[8].slice(1),
      type = match[9] || "";

  // The "n" type is an alias for ",g".
  if (type === "n") comma = true, type = "g";

  // Map invalid types to the default format.
  else if (!formatTypes[type]) type = "";

  // If zero fill is specified, padding goes after sign and before digits.
  if (zero || fill === "0" && align === "=") zero = true, fill = "0", align = "=";

  this.fill = fill;
  this.align = align;
  this.sign = sign;
  this.symbol = symbol;
  this.zero = zero;
  this.width = width;
  this.comma = comma;
  this.precision = precision;
  this.type = type;
}

FormatSpecifier.prototype.toString = function () {
  return this.fill + this.align + this.sign + this.symbol + (this.zero ? "0" : "") + (this.width == null ? "" : Math.max(1, this.width | 0)) + (this.comma ? "," : "") + (this.precision == null ? "" : "." + Math.max(0, this.precision | 0)) + this.type;
};

var prefixes = ["y", "z", "a", "f", "p", "n", "µ", "m", "", "k", "M", "G", "T", "P", "E", "Z", "Y"];

function identity$3(x) {
  return x;
}

var formatLocale = function (locale) {
  var group = locale.grouping && locale.thousands ? formatGroup(locale.grouping, locale.thousands) : identity$3,
      currency = locale.currency,
      decimal = locale.decimal;

  function newFormat(specifier) {
    specifier = formatSpecifier(specifier);

    var fill = specifier.fill,
        align = specifier.align,
        sign = specifier.sign,
        symbol = specifier.symbol,
        zero = specifier.zero,
        width = specifier.width,
        comma = specifier.comma,
        precision = specifier.precision,
        type = specifier.type;

    // Compute the prefix and suffix.
    // For SI-prefix, the suffix is lazily computed.
    var prefix = symbol === "$" ? currency[0] : symbol === "#" && /[boxX]/.test(type) ? "0" + type.toLowerCase() : "",
        suffix = symbol === "$" ? currency[1] : /[%p]/.test(type) ? "%" : "";

    // What format function should we use?
    // Is this an integer type?
    // Can this type generate exponential notation?
    var formatType = formatTypes[type],
        maybeSuffix = !type || /[defgprs%]/.test(type);

    // Set the default precision if not specified,
    // or clamp the specified precision to the supported range.
    // For significant precision, it must be in [1, 21].
    // For fixed precision, it must be in [0, 20].
    precision = precision == null ? type ? 6 : 12 : /[gprs]/.test(type) ? Math.max(1, Math.min(21, precision)) : Math.max(0, Math.min(20, precision));

    function format(value) {
      var valuePrefix = prefix,
          valueSuffix = suffix,
          i,
          n,
          c;

      if (type === "c") {
        valueSuffix = formatType(value) + valueSuffix;
        value = "";
      } else {
        value = +value;

        // Convert negative to positive, and compute the prefix.
        // Note that -0 is not less than 0, but 1 / -0 is!
        var valueNegative = (value < 0 || 1 / value < 0) && (value *= -1, true);

        // Perform the initial formatting.
        value = formatType(value, precision);

        // If the original value was negative, it may be rounded to zero during
        // formatting; treat this as (positive) zero.
        if (valueNegative) {
          i = -1, n = value.length;
          valueNegative = false;
          while (++i < n) {
            if (c = value.charCodeAt(i), 48 < c && c < 58 || type === "x" && 96 < c && c < 103 || type === "X" && 64 < c && c < 71) {
              valueNegative = true;
              break;
            }
          }
        }

        // Compute the prefix and suffix.
        valuePrefix = (valueNegative ? sign === "(" ? sign : "-" : sign === "-" || sign === "(" ? "" : sign) + valuePrefix;
        valueSuffix = valueSuffix + (type === "s" ? prefixes[8 + prefixExponent / 3] : "") + (valueNegative && sign === "(" ? ")" : "");

        // Break the formatted value into the integer “value” part that can be
        // grouped, and fractional or exponential “suffix” part that is not.
        if (maybeSuffix) {
          i = -1, n = value.length;
          while (++i < n) {
            if (c = value.charCodeAt(i), 48 > c || c > 57) {
              valueSuffix = (c === 46 ? decimal + value.slice(i + 1) : value.slice(i)) + valueSuffix;
              value = value.slice(0, i);
              break;
            }
          }
        }
      }

      // If the fill character is not "0", grouping is applied before padding.
      if (comma && !zero) value = group(value, Infinity);

      // Compute the padding.
      var length = valuePrefix.length + value.length + valueSuffix.length,
          padding = length < width ? new Array(width - length + 1).join(fill) : "";

      // If the fill character is "0", grouping is applied after padding.
      if (comma && zero) value = group(padding + value, padding.length ? width - valueSuffix.length : Infinity), padding = "";

      // Reconstruct the final output based on the desired alignment.
      switch (align) {
        case "<":
          return valuePrefix + value + valueSuffix + padding;
        case "=":
          return valuePrefix + padding + value + valueSuffix;
        case "^":
          return padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length);
      }
      return padding + valuePrefix + value + valueSuffix;
    }

    format.toString = function () {
      return specifier + "";
    };

    return format;
  }

  function formatPrefix(specifier, value) {
    var f = newFormat((specifier = formatSpecifier(specifier), specifier.type = "f", specifier)),
        e = Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3,
        k = Math.pow(10, -e),
        prefix = prefixes[8 + e / 3];
    return function (value) {
      return f(k * value) + prefix;
    };
  }

  return {
    format: newFormat,
    formatPrefix: formatPrefix
  };
};

var locale$1;



defaultLocale({
  decimal: ".",
  thousands: ",",
  grouping: [3],
  currency: ["$", ""]
});

function defaultLocale(definition) {
  locale$1 = formatLocale(definition);
  exports.format = locale$1.format;
  exports.formatPrefix = locale$1.formatPrefix;
  return locale$1;
}

var precisionFixed = function (step) {
  return Math.max(0, -exponent$1(Math.abs(step)));
};

var precisionPrefix = function (step, value) {
  return Math.max(0, Math.max(-8, Math.min(8, Math.floor(exponent$1(value) / 3))) * 3 - exponent$1(Math.abs(step)));
};

var precisionRound = function (step, max) {
  step = Math.abs(step), max = Math.abs(max) - step;
  return Math.max(0, exponent$1(max) - exponent$1(step)) + 1;
};

function localDate(d) {
  if (0 <= d.y && d.y < 100) {
    var date = new Date(-1, d.m, d.d, d.H, d.M, d.S, d.L);
    date.setFullYear(d.y);
    return date;
  }
  return new Date(d.y, d.m, d.d, d.H, d.M, d.S, d.L);
}

function utcDate(d) {
  if (0 <= d.y && d.y < 100) {
    var date = new Date(Date.UTC(-1, d.m, d.d, d.H, d.M, d.S, d.L));
    date.setUTCFullYear(d.y);
    return date;
  }
  return new Date(Date.UTC(d.y, d.m, d.d, d.H, d.M, d.S, d.L));
}

function newYear(y) {
  return { y: y, m: 0, d: 1, H: 0, M: 0, S: 0, L: 0 };
}

function formatLocale$1(locale) {
  var locale_dateTime = locale.dateTime,
      locale_date = locale.date,
      locale_time = locale.time,
      locale_periods = locale.periods,
      locale_weekdays = locale.days,
      locale_shortWeekdays = locale.shortDays,
      locale_months = locale.months,
      locale_shortMonths = locale.shortMonths;

  var periodRe = formatRe(locale_periods),
      periodLookup = formatLookup(locale_periods),
      weekdayRe = formatRe(locale_weekdays),
      weekdayLookup = formatLookup(locale_weekdays),
      shortWeekdayRe = formatRe(locale_shortWeekdays),
      shortWeekdayLookup = formatLookup(locale_shortWeekdays),
      monthRe = formatRe(locale_months),
      monthLookup = formatLookup(locale_months),
      shortMonthRe = formatRe(locale_shortMonths),
      shortMonthLookup = formatLookup(locale_shortMonths);

  var formats = {
    "a": formatShortWeekday,
    "A": formatWeekday,
    "b": formatShortMonth,
    "B": formatMonth,
    "c": null,
    "d": formatDayOfMonth,
    "e": formatDayOfMonth,
    "H": formatHour24,
    "I": formatHour12,
    "j": formatDayOfYear,
    "L": formatMilliseconds,
    "m": formatMonthNumber,
    "M": formatMinutes,
    "p": formatPeriod,
    "S": formatSeconds,
    "U": formatWeekNumberSunday,
    "w": formatWeekdayNumber,
    "W": formatWeekNumberMonday,
    "x": null,
    "X": null,
    "y": formatYear,
    "Y": formatFullYear,
    "Z": formatZone,
    "%": formatLiteralPercent
  };

  var utcFormats = {
    "a": formatUTCShortWeekday,
    "A": formatUTCWeekday,
    "b": formatUTCShortMonth,
    "B": formatUTCMonth,
    "c": null,
    "d": formatUTCDayOfMonth,
    "e": formatUTCDayOfMonth,
    "H": formatUTCHour24,
    "I": formatUTCHour12,
    "j": formatUTCDayOfYear,
    "L": formatUTCMilliseconds,
    "m": formatUTCMonthNumber,
    "M": formatUTCMinutes,
    "p": formatUTCPeriod,
    "S": formatUTCSeconds,
    "U": formatUTCWeekNumberSunday,
    "w": formatUTCWeekdayNumber,
    "W": formatUTCWeekNumberMonday,
    "x": null,
    "X": null,
    "y": formatUTCYear,
    "Y": formatUTCFullYear,
    "Z": formatUTCZone,
    "%": formatLiteralPercent
  };

  var parses = {
    "a": parseShortWeekday,
    "A": parseWeekday,
    "b": parseShortMonth,
    "B": parseMonth,
    "c": parseLocaleDateTime,
    "d": parseDayOfMonth,
    "e": parseDayOfMonth,
    "H": parseHour24,
    "I": parseHour24,
    "j": parseDayOfYear,
    "L": parseMilliseconds,
    "m": parseMonthNumber,
    "M": parseMinutes,
    "p": parsePeriod,
    "S": parseSeconds,
    "U": parseWeekNumberSunday,
    "w": parseWeekdayNumber,
    "W": parseWeekNumberMonday,
    "x": parseLocaleDate,
    "X": parseLocaleTime,
    "y": parseYear,
    "Y": parseFullYear,
    "Z": parseZone,
    "%": parseLiteralPercent
  };

  // These recursive directive definitions must be deferred.
  formats.x = newFormat(locale_date, formats);
  formats.X = newFormat(locale_time, formats);
  formats.c = newFormat(locale_dateTime, formats);
  utcFormats.x = newFormat(locale_date, utcFormats);
  utcFormats.X = newFormat(locale_time, utcFormats);
  utcFormats.c = newFormat(locale_dateTime, utcFormats);

  function newFormat(specifier, formats) {
    return function (date) {
      var string = [],
          i = -1,
          j = 0,
          n = specifier.length,
          c,
          pad,
          format;

      if (!(date instanceof Date)) date = new Date(+date);

      while (++i < n) {
        if (specifier.charCodeAt(i) === 37) {
          string.push(specifier.slice(j, i));
          if ((pad = pads[c = specifier.charAt(++i)]) != null) c = specifier.charAt(++i);else pad = c === "e" ? " " : "0";
          if (format = formats[c]) c = format(date, pad);
          string.push(c);
          j = i + 1;
        }
      }

      string.push(specifier.slice(j, i));
      return string.join("");
    };
  }

  function newParse(specifier, newDate) {
    return function (string) {
      var d = newYear(1900),
          i = parseSpecifier(d, specifier, string += "", 0);
      if (i != string.length) return null;

      // The am-pm flag is 0 for AM, and 1 for PM.
      if ("p" in d) d.H = d.H % 12 + d.p * 12;

      // Convert day-of-week and week-of-year to day-of-year.
      if ("W" in d || "U" in d) {
        if (!("w" in d)) d.w = "W" in d ? 1 : 0;
        var day$$1 = "Z" in d ? utcDate(newYear(d.y)).getUTCDay() : newDate(newYear(d.y)).getDay();
        d.m = 0;
        d.d = "W" in d ? (d.w + 6) % 7 + d.W * 7 - (day$$1 + 5) % 7 : d.w + d.U * 7 - (day$$1 + 6) % 7;
      }

      // If a time zone is specified, all fields are interpreted as UTC and then
      // offset according to the specified time zone.
      if ("Z" in d) {
        d.H += d.Z / 100 | 0;
        d.M += d.Z % 100;
        return utcDate(d);
      }

      // Otherwise, all fields are in local time.
      return newDate(d);
    };
  }

  function parseSpecifier(d, specifier, string, j) {
    var i = 0,
        n = specifier.length,
        m = string.length,
        c,
        parse;

    while (i < n) {
      if (j >= m) return -1;
      c = specifier.charCodeAt(i++);
      if (c === 37) {
        c = specifier.charAt(i++);
        parse = parses[c in pads ? specifier.charAt(i++) : c];
        if (!parse || (j = parse(d, string, j)) < 0) return -1;
      } else if (c != string.charCodeAt(j++)) {
        return -1;
      }
    }

    return j;
  }

  function parsePeriod(d, string, i) {
    var n = periodRe.exec(string.slice(i));
    return n ? (d.p = periodLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseShortWeekday(d, string, i) {
    var n = shortWeekdayRe.exec(string.slice(i));
    return n ? (d.w = shortWeekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseWeekday(d, string, i) {
    var n = weekdayRe.exec(string.slice(i));
    return n ? (d.w = weekdayLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseShortMonth(d, string, i) {
    var n = shortMonthRe.exec(string.slice(i));
    return n ? (d.m = shortMonthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseMonth(d, string, i) {
    var n = monthRe.exec(string.slice(i));
    return n ? (d.m = monthLookup[n[0].toLowerCase()], i + n[0].length) : -1;
  }

  function parseLocaleDateTime(d, string, i) {
    return parseSpecifier(d, locale_dateTime, string, i);
  }

  function parseLocaleDate(d, string, i) {
    return parseSpecifier(d, locale_date, string, i);
  }

  function parseLocaleTime(d, string, i) {
    return parseSpecifier(d, locale_time, string, i);
  }

  function formatShortWeekday(d) {
    return locale_shortWeekdays[d.getDay()];
  }

  function formatWeekday(d) {
    return locale_weekdays[d.getDay()];
  }

  function formatShortMonth(d) {
    return locale_shortMonths[d.getMonth()];
  }

  function formatMonth(d) {
    return locale_months[d.getMonth()];
  }

  function formatPeriod(d) {
    return locale_periods[+(d.getHours() >= 12)];
  }

  function formatUTCShortWeekday(d) {
    return locale_shortWeekdays[d.getUTCDay()];
  }

  function formatUTCWeekday(d) {
    return locale_weekdays[d.getUTCDay()];
  }

  function formatUTCShortMonth(d) {
    return locale_shortMonths[d.getUTCMonth()];
  }

  function formatUTCMonth(d) {
    return locale_months[d.getUTCMonth()];
  }

  function formatUTCPeriod(d) {
    return locale_periods[+(d.getUTCHours() >= 12)];
  }

  return {
    format: function format(specifier) {
      var f = newFormat(specifier += "", formats);
      f.toString = function () {
        return specifier;
      };
      return f;
    },
    parse: function parse(specifier) {
      var p = newParse(specifier += "", localDate);
      p.toString = function () {
        return specifier;
      };
      return p;
    },
    utcFormat: function utcFormat(specifier) {
      var f = newFormat(specifier += "", utcFormats);
      f.toString = function () {
        return specifier;
      };
      return f;
    },
    utcParse: function utcParse(specifier) {
      var p = newParse(specifier, utcDate);
      p.toString = function () {
        return specifier;
      };
      return p;
    }
  };
}

var pads = { "-": "", "_": " ", "0": "0" };
var numberRe = /^\s*\d+/;
var percentRe = /^%/;
var requoteRe = /[\\\^\$\*\+\?\|\[\]\(\)\.\{\}]/g;

function pad(value, fill, width) {
  var sign = value < 0 ? "-" : "",
      string = (sign ? -value : value) + "",
      length = string.length;
  return sign + (length < width ? new Array(width - length + 1).join(fill) + string : string);
}

function requote(s) {
  return s.replace(requoteRe, "\\$&");
}

function formatRe(names) {
  return new RegExp("^(?:" + names.map(requote).join("|") + ")", "i");
}

function formatLookup(names) {
  var map = {},
      i = -1,
      n = names.length;
  while (++i < n) {
    map[names[i].toLowerCase()] = i;
  }return map;
}

function parseWeekdayNumber(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 1));
  return n ? (d.w = +n[0], i + n[0].length) : -1;
}

function parseWeekNumberSunday(d, string, i) {
  var n = numberRe.exec(string.slice(i));
  return n ? (d.U = +n[0], i + n[0].length) : -1;
}

function parseWeekNumberMonday(d, string, i) {
  var n = numberRe.exec(string.slice(i));
  return n ? (d.W = +n[0], i + n[0].length) : -1;
}

function parseFullYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 4));
  return n ? (d.y = +n[0], i + n[0].length) : -1;
}

function parseYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.y = +n[0] + (+n[0] > 68 ? 1900 : 2000), i + n[0].length) : -1;
}

function parseZone(d, string, i) {
  var n = /^(Z)|([+-]\d\d)(?:\:?(\d\d))?/.exec(string.slice(i, i + 6));
  return n ? (d.Z = n[1] ? 0 : -(n[2] + (n[3] || "00")), i + n[0].length) : -1;
}

function parseMonthNumber(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.m = n[0] - 1, i + n[0].length) : -1;
}

function parseDayOfMonth(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.d = +n[0], i + n[0].length) : -1;
}

function parseDayOfYear(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 3));
  return n ? (d.m = 0, d.d = +n[0], i + n[0].length) : -1;
}

function parseHour24(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.H = +n[0], i + n[0].length) : -1;
}

function parseMinutes(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.M = +n[0], i + n[0].length) : -1;
}

function parseSeconds(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 2));
  return n ? (d.S = +n[0], i + n[0].length) : -1;
}

function parseMilliseconds(d, string, i) {
  var n = numberRe.exec(string.slice(i, i + 3));
  return n ? (d.L = +n[0], i + n[0].length) : -1;
}

function parseLiteralPercent(d, string, i) {
  var n = percentRe.exec(string.slice(i, i + 1));
  return n ? i + n[0].length : -1;
}

function formatDayOfMonth(d, p) {
  return pad(d.getDate(), p, 2);
}

function formatHour24(d, p) {
  return pad(d.getHours(), p, 2);
}

function formatHour12(d, p) {
  return pad(d.getHours() % 12 || 12, p, 2);
}

function formatDayOfYear(d, p) {
  return pad(1 + day.count(year(d), d), p, 3);
}

function formatMilliseconds(d, p) {
  return pad(d.getMilliseconds(), p, 3);
}

function formatMonthNumber(d, p) {
  return pad(d.getMonth() + 1, p, 2);
}

function formatMinutes(d, p) {
  return pad(d.getMinutes(), p, 2);
}

function formatSeconds(d, p) {
  return pad(d.getSeconds(), p, 2);
}

function formatWeekNumberSunday(d, p) {
  return pad(sunday.count(year(d), d), p, 2);
}

function formatWeekdayNumber(d) {
  return d.getDay();
}

function formatWeekNumberMonday(d, p) {
  return pad(monday.count(year(d), d), p, 2);
}

function formatYear(d, p) {
  return pad(d.getFullYear() % 100, p, 2);
}

function formatFullYear(d, p) {
  return pad(d.getFullYear() % 10000, p, 4);
}

function formatZone(d) {
  var z = d.getTimezoneOffset();
  return (z > 0 ? "-" : (z *= -1, "+")) + pad(z / 60 | 0, "0", 2) + pad(z % 60, "0", 2);
}

function formatUTCDayOfMonth(d, p) {
  return pad(d.getUTCDate(), p, 2);
}

function formatUTCHour24(d, p) {
  return pad(d.getUTCHours(), p, 2);
}

function formatUTCHour12(d, p) {
  return pad(d.getUTCHours() % 12 || 12, p, 2);
}

function formatUTCDayOfYear(d, p) {
  return pad(1 + utcDay.count(utcYear(d), d), p, 3);
}

function formatUTCMilliseconds(d, p) {
  return pad(d.getUTCMilliseconds(), p, 3);
}

function formatUTCMonthNumber(d, p) {
  return pad(d.getUTCMonth() + 1, p, 2);
}

function formatUTCMinutes(d, p) {
  return pad(d.getUTCMinutes(), p, 2);
}

function formatUTCSeconds(d, p) {
  return pad(d.getUTCSeconds(), p, 2);
}

function formatUTCWeekNumberSunday(d, p) {
  return pad(utcSunday.count(utcYear(d), d), p, 2);
}

function formatUTCWeekdayNumber(d) {
  return d.getUTCDay();
}

function formatUTCWeekNumberMonday(d, p) {
  return pad(utcMonday.count(utcYear(d), d), p, 2);
}

function formatUTCYear(d, p) {
  return pad(d.getUTCFullYear() % 100, p, 2);
}

function formatUTCFullYear(d, p) {
  return pad(d.getUTCFullYear() % 10000, p, 4);
}

function formatUTCZone() {
  return "+0000";
}

function formatLiteralPercent() {
  return "%";
}

var locale$2;





defaultLocale$1({
  dateTime: "%x, %X",
  date: "%-m/%-d/%Y",
  time: "%-I:%M:%S %p",
  periods: ["AM", "PM"],
  days: ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
  shortDays: ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
  months: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  shortMonths: ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
});

function defaultLocale$1(definition) {
  locale$2 = formatLocale$1(definition);
  exports.timeFormat = locale$2.format;
  exports.timeParse = locale$2.parse;
  exports.utcFormat = locale$2.utcFormat;
  exports.utcParse = locale$2.utcParse;
  return locale$2;
}

var isoSpecifier = "%Y-%m-%dT%H:%M:%S.%LZ";

function formatIsoNative(date) {
    return date.toISOString();
}

var formatIso = Date.prototype.toISOString ? formatIsoNative : exports.utcFormat(isoSpecifier);

function parseIsoNative(string) {
  var date = new Date(string);
  return isNaN(date) ? null : date;
}

var parseIso = +new Date("2000-01-01T00:00:00.000Z") ? parseIsoNative : exports.utcParse(isoSpecifier);

var array$2 = Array.prototype;

var map$3 = array$2.map;
var slice$2 = array$2.slice;

var implicit = { name: "implicit" };

function ordinal(range) {
  var index = map$1(),
      domain = [],
      unknown = implicit;

  range = range == null ? [] : slice$2.call(range);

  function scale(d) {
    var key = d + "",
        i = index.get(key);
    if (!i) {
      if (unknown !== implicit) return unknown;
      index.set(key, i = domain.push(d));
    }
    return range[(i - 1) % range.length];
  }

  scale.domain = function (_) {
    if (!arguments.length) return domain.slice();
    domain = [], index = map$1();
    var i = -1,
        n = _.length,
        d,
        key;
    while (++i < n) {
      if (!index.has(key = (d = _[i]) + "")) index.set(key, domain.push(d));
    }return scale;
  };

  scale.range = function (_) {
    return arguments.length ? (range = slice$2.call(_), scale) : range.slice();
  };

  scale.unknown = function (_) {
    return arguments.length ? (unknown = _, scale) : unknown;
  };

  scale.copy = function () {
    return ordinal().domain(domain).range(range).unknown(unknown);
  };

  return scale;
}

function band() {
  var scale = ordinal().unknown(undefined),
      domain = scale.domain,
      ordinalRange = scale.range,
      range$$1 = [0, 1],
      step,
      bandwidth,
      round = false,
      paddingInner = 0,
      paddingOuter = 0,
      align = 0.5;

  delete scale.unknown;

  function rescale() {
    var n = domain().length,
        reverse = range$$1[1] < range$$1[0],
        start = range$$1[reverse - 0],
        stop = range$$1[1 - reverse];
    step = (stop - start) / Math.max(1, n - paddingInner + paddingOuter * 2);
    if (round) step = Math.floor(step);
    start += (stop - start - step * (n - paddingInner)) * align;
    bandwidth = step * (1 - paddingInner);
    if (round) start = Math.round(start), bandwidth = Math.round(bandwidth);
    var values = range(n).map(function (i) {
      return start + step * i;
    });
    return ordinalRange(reverse ? values.reverse() : values);
  }

  scale.domain = function (_) {
    return arguments.length ? (domain(_), rescale()) : domain();
  };

  scale.range = function (_) {
    return arguments.length ? (range$$1 = [+_[0], +_[1]], rescale()) : range$$1.slice();
  };

  scale.rangeRound = function (_) {
    return range$$1 = [+_[0], +_[1]], round = true, rescale();
  };

  scale.bandwidth = function () {
    return bandwidth;
  };

  scale.step = function () {
    return step;
  };

  scale.round = function (_) {
    return arguments.length ? (round = !!_, rescale()) : round;
  };

  scale.padding = function (_) {
    return arguments.length ? (paddingInner = paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
  };

  scale.paddingInner = function (_) {
    return arguments.length ? (paddingInner = Math.max(0, Math.min(1, _)), rescale()) : paddingInner;
  };

  scale.paddingOuter = function (_) {
    return arguments.length ? (paddingOuter = Math.max(0, Math.min(1, _)), rescale()) : paddingOuter;
  };

  scale.align = function (_) {
    return arguments.length ? (align = Math.max(0, Math.min(1, _)), rescale()) : align;
  };

  scale.copy = function () {
    return band().domain(domain()).range(range$$1).round(round).paddingInner(paddingInner).paddingOuter(paddingOuter).align(align);
  };

  return rescale();
}

function pointish(scale) {
  var copy = scale.copy;

  scale.padding = scale.paddingOuter;
  delete scale.paddingInner;
  delete scale.paddingOuter;

  scale.copy = function () {
    return pointish(copy());
  };

  return scale;
}

function point$1() {
  return pointish(band().paddingInner(1));
}

var constant$4 = function (x) {
  return function () {
    return x;
  };
};

var number$1 = function (x) {
  return +x;
};

var unit = [0, 1];

function deinterpolateLinear(a, b) {
  return (b -= a = +a) ? function (x) {
    return (x - a) / b;
  } : constant$4(b);
}

function deinterpolateClamp(deinterpolate) {
  return function (a, b) {
    var d = deinterpolate(a = +a, b = +b);
    return function (x) {
      return x <= a ? 0 : x >= b ? 1 : d(x);
    };
  };
}

function reinterpolateClamp(reinterpolate) {
  return function (a, b) {
    var r = reinterpolate(a = +a, b = +b);
    return function (t) {
      return t <= 0 ? a : t >= 1 ? b : r(t);
    };
  };
}

function bimap(domain, range$$1, deinterpolate, reinterpolate) {
  var d0 = domain[0],
      d1 = domain[1],
      r0 = range$$1[0],
      r1 = range$$1[1];
  if (d1 < d0) d0 = deinterpolate(d1, d0), r0 = reinterpolate(r1, r0);else d0 = deinterpolate(d0, d1), r0 = reinterpolate(r0, r1);
  return function (x) {
    return r0(d0(x));
  };
}

function polymap(domain, range$$1, deinterpolate, reinterpolate) {
  var j = Math.min(domain.length, range$$1.length) - 1,
      d = new Array(j),
      r = new Array(j),
      i = -1;

  // Reverse descending domains.
  if (domain[j] < domain[0]) {
    domain = domain.slice().reverse();
    range$$1 = range$$1.slice().reverse();
  }

  while (++i < j) {
    d[i] = deinterpolate(domain[i], domain[i + 1]);
    r[i] = reinterpolate(range$$1[i], range$$1[i + 1]);
  }

  return function (x) {
    var i = bisectRight(domain, x, 1, j) - 1;
    return r[i](d[i](x));
  };
}

function copy(source, target) {
  return target.domain(source.domain()).range(source.range()).interpolate(source.interpolate()).clamp(source.clamp());
}

// deinterpolate(a, b)(x) takes a domain value x in [a,b] and returns the corresponding parameter t in [0,1].
// reinterpolate(a, b)(t) takes a parameter t in [0,1] and returns the corresponding domain value x in [a,b].
function continuous(deinterpolate, reinterpolate) {
  var domain = unit,
      range$$1 = unit,
      interpolate$$1 = interpolate,
      clamp = false,
      piecewise,
      output,
      input;

  function rescale() {
    piecewise = Math.min(domain.length, range$$1.length) > 2 ? polymap : bimap;
    output = input = null;
    return scale;
  }

  function scale(x) {
    return (output || (output = piecewise(domain, range$$1, clamp ? deinterpolateClamp(deinterpolate) : deinterpolate, interpolate$$1)))(+x);
  }

  scale.invert = function (y) {
    return (input || (input = piecewise(range$$1, domain, deinterpolateLinear, clamp ? reinterpolateClamp(reinterpolate) : reinterpolate)))(+y);
  };

  scale.domain = function (_) {
    return arguments.length ? (domain = map$3.call(_, number$1), rescale()) : domain.slice();
  };

  scale.range = function (_) {
    return arguments.length ? (range$$1 = slice$2.call(_), rescale()) : range$$1.slice();
  };

  scale.rangeRound = function (_) {
    return range$$1 = slice$2.call(_), interpolate$$1 = interpolateRound, rescale();
  };

  scale.clamp = function (_) {
    return arguments.length ? (clamp = !!_, rescale()) : clamp;
  };

  scale.interpolate = function (_) {
    return arguments.length ? (interpolate$$1 = _, rescale()) : interpolate$$1;
  };

  return rescale();
}

var tickFormat = function (domain, count, specifier) {
  var start = domain[0],
      stop = domain[domain.length - 1],
      step = tickStep(start, stop, count == null ? 10 : count),
      precision;
  specifier = formatSpecifier(specifier == null ? ",f" : specifier);
  switch (specifier.type) {
    case "s":
      {
        var value = Math.max(Math.abs(start), Math.abs(stop));
        if (specifier.precision == null && !isNaN(precision = precisionPrefix(step, value))) specifier.precision = precision;
        return exports.formatPrefix(specifier, value);
      }
    case "":
    case "e":
    case "g":
    case "p":
    case "r":
      {
        if (specifier.precision == null && !isNaN(precision = precisionRound(step, Math.max(Math.abs(start), Math.abs(stop))))) specifier.precision = precision - (specifier.type === "e");
        break;
      }
    case "f":
    case "%":
      {
        if (specifier.precision == null && !isNaN(precision = precisionFixed(step))) specifier.precision = precision - (specifier.type === "%") * 2;
        break;
      }
  }
  return exports.format(specifier);
};

function linearish(scale) {
  var domain = scale.domain;

  scale.ticks = function (count) {
    var d = domain();
    return ticks(d[0], d[d.length - 1], count == null ? 10 : count);
  };

  scale.tickFormat = function (count, specifier) {
    return tickFormat(domain(), count, specifier);
  };

  scale.nice = function (count) {
    var d = domain(),
        i = d.length - 1,
        n = count == null ? 10 : count,
        start = d[0],
        stop = d[i],
        step = tickStep(start, stop, n);

    if (step) {
      step = tickStep(Math.floor(start / step) * step, Math.ceil(stop / step) * step, n);
      d[0] = Math.floor(start / step) * step;
      d[i] = Math.ceil(stop / step) * step;
      domain(d);
    }

    return scale;
  };

  return scale;
}

function linear$2() {
  var scale = continuous(deinterpolateLinear, interpolateNumber);

  scale.copy = function () {
    return copy(scale, linear$2());
  };

  return linearish(scale);
}

function identity$4() {
  var domain = [0, 1];

  function scale(x) {
    return +x;
  }

  scale.invert = scale;

  scale.domain = scale.range = function (_) {
    return arguments.length ? (domain = map$3.call(_, number$1), scale) : domain.slice();
  };

  scale.copy = function () {
    return identity$4().domain(domain);
  };

  return linearish(scale);
}

var nice = function (domain, interval) {
  domain = domain.slice();

  var i0 = 0,
      i1 = domain.length - 1,
      x0 = domain[i0],
      x1 = domain[i1],
      t;

  if (x1 < x0) {
    t = i0, i0 = i1, i1 = t;
    t = x0, x0 = x1, x1 = t;
  }

  domain[i0] = interval.floor(x0);
  domain[i1] = interval.ceil(x1);
  return domain;
};

function deinterpolate(a, b) {
  return (b = Math.log(b / a)) ? function (x) {
    return Math.log(x / a) / b;
  } : constant$4(b);
}

function reinterpolate(a, b) {
  return a < 0 ? function (t) {
    return -Math.pow(-b, t) * Math.pow(-a, 1 - t);
  } : function (t) {
    return Math.pow(b, t) * Math.pow(a, 1 - t);
  };
}

function pow10(x) {
  return isFinite(x) ? +("1e" + x) : x < 0 ? 0 : x;
}

function powp(base) {
  return base === 10 ? pow10 : base === Math.E ? Math.exp : function (x) {
    return Math.pow(base, x);
  };
}

function logp(base) {
  return base === Math.E ? Math.log : base === 10 && Math.log10 || base === 2 && Math.log2 || (base = Math.log(base), function (x) {
    return Math.log(x) / base;
  });
}

function reflect(f) {
  return function (x) {
    return -f(-x);
  };
}

function log() {
  var scale = continuous(deinterpolate, reinterpolate).domain([1, 10]),
      domain = scale.domain,
      base = 10,
      logs = logp(10),
      pows = powp(10);

  function rescale() {
    logs = logp(base), pows = powp(base);
    if (domain()[0] < 0) logs = reflect(logs), pows = reflect(pows);
    return scale;
  }

  scale.base = function (_) {
    return arguments.length ? (base = +_, rescale()) : base;
  };

  scale.domain = function (_) {
    return arguments.length ? (domain(_), rescale()) : domain();
  };

  scale.ticks = function (count) {
    var d = domain(),
        u = d[0],
        v = d[d.length - 1],
        r;

    if (r = v < u) i = u, u = v, v = i;

    var i = logs(u),
        j = logs(v),
        p,
        k,
        t,
        n = count == null ? 10 : +count,
        z = [];

    if (!(base % 1) && j - i < n) {
      i = Math.round(i) - 1, j = Math.round(j) + 1;
      if (u > 0) for (; i < j; ++i) {
        for (k = 1, p = pows(i); k < base; ++k) {
          t = p * k;
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      } else for (; i < j; ++i) {
        for (k = base - 1, p = pows(i); k >= 1; --k) {
          t = p * k;
          if (t < u) continue;
          if (t > v) break;
          z.push(t);
        }
      }
    } else {
      z = ticks(i, j, Math.min(j - i, n)).map(pows);
    }

    return r ? z.reverse() : z;
  };

  scale.tickFormat = function (count, specifier) {
    if (specifier == null) specifier = base === 10 ? ".0e" : ",";
    if (typeof specifier !== "function") specifier = exports.format(specifier);
    if (count === Infinity) return specifier;
    if (count == null) count = 10;
    var k = Math.max(1, base * count / scale.ticks().length); // TODO fast estimate?
    return function (d) {
      var i = d / pows(Math.round(logs(d)));
      if (i * base < base - 0.5) i *= base;
      return i <= k ? specifier(d) : "";
    };
  };

  scale.nice = function () {
    return domain(nice(domain(), {
      floor: function floor(x) {
        return pows(Math.floor(logs(x)));
      },
      ceil: function ceil(x) {
        return pows(Math.ceil(logs(x)));
      }
    }));
  };

  scale.copy = function () {
    return copy(scale, log().base(base));
  };

  return scale;
}

function raise(x, exponent) {
  return x < 0 ? -Math.pow(-x, exponent) : Math.pow(x, exponent);
}

function pow() {
  var exponent = 1,
      scale = continuous(deinterpolate, reinterpolate),
      domain = scale.domain;

  function deinterpolate(a, b) {
    return (b = raise(b, exponent) - (a = raise(a, exponent))) ? function (x) {
      return (raise(x, exponent) - a) / b;
    } : constant$4(b);
  }

  function reinterpolate(a, b) {
    b = raise(b, exponent) - (a = raise(a, exponent));
    return function (t) {
      return raise(a + b * t, 1 / exponent);
    };
  }

  scale.exponent = function (_) {
    return arguments.length ? (exponent = +_, domain(domain())) : exponent;
  };

  scale.copy = function () {
    return copy(scale, pow().exponent(exponent));
  };

  return linearish(scale);
}

function sqrt() {
  return pow().exponent(0.5);
}

function quantile$$1() {
  var domain = [],
      range$$1 = [],
      thresholds = [];

  function rescale() {
    var i = 0,
        n = Math.max(1, range$$1.length);
    thresholds = new Array(n - 1);
    while (++i < n) {
      thresholds[i - 1] = threshold(domain, i / n);
    }return scale;
  }

  function scale(x) {
    if (!isNaN(x = +x)) return range$$1[bisectRight(thresholds, x)];
  }

  scale.invertExtent = function (y) {
    var i = range$$1.indexOf(y);
    return i < 0 ? [NaN, NaN] : [i > 0 ? thresholds[i - 1] : domain[0], i < thresholds.length ? thresholds[i] : domain[domain.length - 1]];
  };

  scale.domain = function (_) {
    if (!arguments.length) return domain.slice();
    domain = [];
    for (var i = 0, n = _.length, d; i < n; ++i) {
      if (d = _[i], d != null && !isNaN(d = +d)) domain.push(d);
    }domain.sort(ascending);
    return rescale();
  };

  scale.range = function (_) {
    return arguments.length ? (range$$1 = slice$2.call(_), rescale()) : range$$1.slice();
  };

  scale.quantiles = function () {
    return thresholds.slice();
  };

  scale.copy = function () {
    return quantile$$1().domain(domain).range(range$$1);
  };

  return scale;
}

function quantize$1() {
  var x0 = 0,
      x1 = 1,
      n = 1,
      domain = [0.5],
      range$$1 = [0, 1];

  function scale(x) {
    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
  }

  function rescale() {
    var i = -1;
    domain = new Array(n);
    while (++i < n) {
      domain[i] = ((i + 1) * x1 - (i - n) * x0) / (n + 1);
    }return scale;
  }

  scale.domain = function (_) {
    return arguments.length ? (x0 = +_[0], x1 = +_[1], rescale()) : [x0, x1];
  };

  scale.range = function (_) {
    return arguments.length ? (n = (range$$1 = slice$2.call(_)).length - 1, rescale()) : range$$1.slice();
  };

  scale.invertExtent = function (y) {
    var i = range$$1.indexOf(y);
    return i < 0 ? [NaN, NaN] : i < 1 ? [x0, domain[0]] : i >= n ? [domain[n - 1], x1] : [domain[i - 1], domain[i]];
  };

  scale.copy = function () {
    return quantize$1().domain([x0, x1]).range(range$$1);
  };

  return linearish(scale);
}

function threshold$1() {
  var domain = [0.5],
      range$$1 = [0, 1],
      n = 1;

  function scale(x) {
    if (x <= x) return range$$1[bisectRight(domain, x, 0, n)];
  }

  scale.domain = function (_) {
    return arguments.length ? (domain = slice$2.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : domain.slice();
  };

  scale.range = function (_) {
    return arguments.length ? (range$$1 = slice$2.call(_), n = Math.min(domain.length, range$$1.length - 1), scale) : range$$1.slice();
  };

  scale.invertExtent = function (y) {
    var i = range$$1.indexOf(y);
    return [domain[i - 1], domain[i]];
  };

  scale.copy = function () {
    return threshold$1().domain(domain).range(range$$1);
  };

  return scale;
}

var durationSecond$1 = 1000;
var durationMinute$1 = durationSecond$1 * 60;
var durationHour$1 = durationMinute$1 * 60;
var durationDay$1 = durationHour$1 * 24;
var durationWeek$1 = durationDay$1 * 7;
var durationMonth = durationDay$1 * 30;
var durationYear = durationDay$1 * 365;

function date$1(t) {
  return new Date(t);
}

function number$2(t) {
  return t instanceof Date ? +t : +new Date(+t);
}

function calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format) {
  var scale = continuous(deinterpolateLinear, interpolateNumber),
      invert = scale.invert,
      domain = scale.domain;

  var formatMillisecond = format(".%L"),
      formatSecond = format(":%S"),
      formatMinute = format("%I:%M"),
      formatHour = format("%I %p"),
      formatDay = format("%a %d"),
      formatWeek = format("%b %d"),
      formatMonth = format("%B"),
      formatYear = format("%Y");

  var tickIntervals = [[second$$1, 1, durationSecond$1], [second$$1, 5, 5 * durationSecond$1], [second$$1, 15, 15 * durationSecond$1], [second$$1, 30, 30 * durationSecond$1], [minute$$1, 1, durationMinute$1], [minute$$1, 5, 5 * durationMinute$1], [minute$$1, 15, 15 * durationMinute$1], [minute$$1, 30, 30 * durationMinute$1], [hour$$1, 1, durationHour$1], [hour$$1, 3, 3 * durationHour$1], [hour$$1, 6, 6 * durationHour$1], [hour$$1, 12, 12 * durationHour$1], [day$$1, 1, durationDay$1], [day$$1, 2, 2 * durationDay$1], [week, 1, durationWeek$1], [month$$1, 1, durationMonth], [month$$1, 3, 3 * durationMonth], [year$$1, 1, durationYear]];

  function tickFormat(date) {
    return (second$$1(date) < date ? formatMillisecond : minute$$1(date) < date ? formatSecond : hour$$1(date) < date ? formatMinute : day$$1(date) < date ? formatHour : month$$1(date) < date ? week(date) < date ? formatDay : formatWeek : year$$1(date) < date ? formatMonth : formatYear)(date);
  }

  function tickInterval(interval, start, stop, step) {
    if (interval == null) interval = 10;

    // If a desired tick count is specified, pick a reasonable tick interval
    // based on the extent of the domain and a rough estimate of tick size.
    // Otherwise, assume interval is already a time interval and use it.
    if (typeof interval === "number") {
      var target = Math.abs(stop - start) / interval,
          i = bisector(function (i) {
        return i[2];
      }).right(tickIntervals, target);
      if (i === tickIntervals.length) {
        step = tickStep(start / durationYear, stop / durationYear, interval);
        interval = year$$1;
      } else if (i) {
        i = tickIntervals[target / tickIntervals[i - 1][2] < tickIntervals[i][2] / target ? i - 1 : i];
        step = i[1];
        interval = i[0];
      } else {
        step = tickStep(start, stop, interval);
        interval = millisecond$$1;
      }
    }

    return step == null ? interval : interval.every(step);
  }

  scale.invert = function (y) {
    return new Date(invert(y));
  };

  scale.domain = function (_) {
    return arguments.length ? domain(map$3.call(_, number$2)) : domain().map(date$1);
  };

  scale.ticks = function (interval, step) {
    var d = domain(),
        t0 = d[0],
        t1 = d[d.length - 1],
        r = t1 < t0,
        t;
    if (r) t = t0, t0 = t1, t1 = t;
    t = tickInterval(interval, t0, t1, step);
    t = t ? t.range(t0, t1 + 1) : []; // inclusive stop
    return r ? t.reverse() : t;
  };

  scale.tickFormat = function (count, specifier) {
    return specifier == null ? tickFormat : format(specifier);
  };

  scale.nice = function (interval, step) {
    var d = domain();
    return (interval = tickInterval(interval, d[0], d[d.length - 1], step)) ? domain(nice(d, interval)) : scale;
  };

  scale.copy = function () {
    return copy(scale, calendar(year$$1, month$$1, week, day$$1, hour$$1, minute$$1, second$$1, millisecond$$1, format));
  };

  return scale;
}

var time = function () {
  return calendar(year, month, sunday, day, hour, minute, second, millisecond, exports.timeFormat).domain([new Date(2000, 0, 1), new Date(2000, 0, 2)]);
};

var utcTime = function () {
  return calendar(utcYear, utcMonth, utcSunday, utcDay, utcHour, utcMinute, second, millisecond, exports.utcFormat).domain([Date.UTC(2000, 0, 1), Date.UTC(2000, 0, 2)]);
};

var colors = function (s) {
  return s.match(/.{6}/g).map(function (x) {
    return "#" + x;
  });
};

var category10 = colors("1f77b4ff7f0e2ca02cd627289467bd8c564be377c27f7f7fbcbd2217becf");

var category20b = colors("393b795254a36b6ecf9c9ede6379398ca252b5cf6bcedb9c8c6d31bd9e39e7ba52e7cb94843c39ad494ad6616be7969c7b4173a55194ce6dbdde9ed6");

var category20c = colors("3182bd6baed69ecae1c6dbefe6550dfd8d3cfdae6bfdd0a231a35474c476a1d99bc7e9c0756bb19e9ac8bcbddcdadaeb636363969696bdbdbdd9d9d9");

var category20 = colors("1f77b4aec7e8ff7f0effbb782ca02c98df8ad62728ff98969467bdc5b0d58c564bc49c94e377c2f7b6d27f7f7fc7c7c7bcbd22dbdb8d17becf9edae5");

var cubehelix$3 = cubehelixLong(cubehelix(300, 0.5, 0.0), cubehelix(-240, 0.5, 1.0));

var warm = cubehelixLong(cubehelix(-100, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

var cool = cubehelixLong(cubehelix(260, 0.75, 0.35), cubehelix(80, 1.50, 0.8));

var rainbow = cubehelix();

var rainbow$1 = function (t) {
  if (t < 0 || t > 1) t -= Math.floor(t);
  var ts = Math.abs(t - 0.5);
  rainbow.h = 360 * t - 100;
  rainbow.s = 1.5 - 1.5 * ts;
  rainbow.l = 0.8 - 0.9 * ts;
  return rainbow + "";
};

function ramp(range) {
  var n = range.length;
  return function (t) {
    return range[Math.max(0, Math.min(n - 1, Math.floor(t * n)))];
  };
}

var viridis = ramp(colors("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"));

var magma = ramp(colors("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"));

var inferno = ramp(colors("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"));

var plasma = ramp(colors("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"));

function sequential(interpolator) {
  var x0 = 0,
      x1 = 1,
      clamp = false;

  function scale(x) {
    var t = (x - x0) / (x1 - x0);
    return interpolator(clamp ? Math.max(0, Math.min(1, t)) : t);
  }

  scale.domain = function (_) {
    return arguments.length ? (x0 = +_[0], x1 = +_[1], scale) : [x0, x1];
  };

  scale.clamp = function (_) {
    return arguments.length ? (clamp = !!_, scale) : clamp;
  };

  scale.interpolator = function (_) {
    return arguments.length ? (interpolator = _, scale) : interpolator;
  };

  scale.copy = function () {
    return sequential(interpolator).domain([x0, x1]).clamp(clamp);
  };

  return linearish(scale);
}

var xhtml = "http://www.w3.org/1999/xhtml";

var namespaces = {
  svg: "http://www.w3.org/2000/svg",
  xhtml: xhtml,
  xlink: "http://www.w3.org/1999/xlink",
  xml: "http://www.w3.org/XML/1998/namespace",
  xmlns: "http://www.w3.org/2000/xmlns/"
};

var namespace = function (name) {
  var prefix = name += "",
      i = prefix.indexOf(":");
  if (i >= 0 && (prefix = name.slice(0, i)) !== "xmlns") name = name.slice(i + 1);
  return namespaces.hasOwnProperty(prefix) ? { space: namespaces[prefix], local: name } : name;
};

function creatorInherit(name) {
  return function () {
    var document = this.ownerDocument,
        uri = this.namespaceURI;
    return uri === xhtml && document.documentElement.namespaceURI === xhtml ? document.createElement(name) : document.createElementNS(uri, name);
  };
}

function creatorFixed(fullname) {
  return function () {
    return this.ownerDocument.createElementNS(fullname.space, fullname.local);
  };
}

var creator = function (name) {
  var fullname = namespace(name);
  return (fullname.local ? creatorFixed : creatorInherit)(fullname);
};

var nextId = 0;

function local() {
  return new Local();
}

function Local() {
  this._ = "@" + (++nextId).toString(36);
}

Local.prototype = local.prototype = {
  constructor: Local,
  get: function get(node) {
    var id = this._;
    while (!(id in node)) {
      if (!(node = node.parentNode)) return;
    }return node[id];
  },
  set: function set(node, value) {
    return node[this._] = value;
  },
  remove: function remove(node) {
    return this._ in node && delete node[this._];
  },
  toString: function toString() {
    return this._;
  }
};

var matcher = function matcher(selector) {
  return function () {
    return this.matches(selector);
  };
};

if (typeof document !== "undefined") {
  var element = document.documentElement;
  if (!element.matches) {
    var vendorMatches = element.webkitMatchesSelector || element.msMatchesSelector || element.mozMatchesSelector || element.oMatchesSelector;
    matcher = function matcher(selector) {
      return function () {
        return vendorMatches.call(this, selector);
      };
    };
  }
}

var matcher$1 = matcher;

var filterEvents = {};

exports.event = null;

if (typeof document !== "undefined") {
  var element$1 = document.documentElement;
  if (!("onmouseenter" in element$1)) {
    filterEvents = { mouseenter: "mouseover", mouseleave: "mouseout" };
  }
}

function filterContextListener(listener, index, group) {
  listener = contextListener(listener, index, group);
  return function (event) {
    var related = event.relatedTarget;
    if (!related || related !== this && !(related.compareDocumentPosition(this) & 8)) {
      listener.call(this, event);
    }
  };
}

function contextListener(listener, index, group) {
  return function (event1) {
    var event0 = exports.event; // Events can be reentrant (e.g., focus).
    exports.event = event1;
    try {
      listener.call(this, this.__data__, index, group);
    } finally {
      exports.event = event0;
    }
  };
}

function parseTypenames$1(typenames) {
  return typenames.trim().split(/^|\s+/).map(function (t) {
    var name = "",
        i = t.indexOf(".");
    if (i >= 0) name = t.slice(i + 1), t = t.slice(0, i);
    return { type: t, name: name };
  });
}

function onRemove(typename) {
  return function () {
    var on = this.__on;
    if (!on) return;
    for (var j = 0, i = -1, m = on.length, o; j < m; ++j) {
      if (o = on[j], (!typename.type || o.type === typename.type) && o.name === typename.name) {
        this.removeEventListener(o.type, o.listener, o.capture);
      } else {
        on[++i] = o;
      }
    }
    if (++i) on.length = i;else delete this.__on;
  };
}

function onAdd(typename, value, capture) {
  var wrap = filterEvents.hasOwnProperty(typename.type) ? filterContextListener : contextListener;
  return function (d, i, group) {
    var on = this.__on,
        o,
        listener = wrap(value, i, group);
    if (on) for (var j = 0, m = on.length; j < m; ++j) {
      if ((o = on[j]).type === typename.type && o.name === typename.name) {
        this.removeEventListener(o.type, o.listener, o.capture);
        this.addEventListener(o.type, o.listener = listener, o.capture = capture);
        o.value = value;
        return;
      }
    }
    this.addEventListener(typename.type, listener, capture);
    o = { type: typename.type, name: typename.name, value: value, listener: listener, capture: capture };
    if (!on) this.__on = [o];else on.push(o);
  };
}

var selection_on = function (typename, value, capture) {
  var typenames = parseTypenames$1(typename + ""),
      i,
      n = typenames.length,
      t;

  if (arguments.length < 2) {
    var on = this.node().__on;
    if (on) for (var j = 0, m = on.length, o; j < m; ++j) {
      for (i = 0, o = on[j]; i < n; ++i) {
        if ((t = typenames[i]).type === o.type && t.name === o.name) {
          return o.value;
        }
      }
    }
    return;
  }

  on = value ? onAdd : onRemove;
  if (capture == null) capture = false;
  for (i = 0; i < n; ++i) {
    this.each(on(typenames[i], value, capture));
  }return this;
};

function customEvent(event1, listener, that, args) {
  var event0 = exports.event;
  event1.sourceEvent = exports.event;
  exports.event = event1;
  try {
    return listener.apply(that, args);
  } finally {
    exports.event = event0;
  }
}

var sourceEvent = function () {
  var current = exports.event,
      source;
  while (source = current.sourceEvent) {
    current = source;
  }return current;
};

var point$2 = function (node, event) {
  var svg = node.ownerSVGElement || node;

  if (svg.createSVGPoint) {
    var point = svg.createSVGPoint();
    point.x = event.clientX, point.y = event.clientY;
    point = point.matrixTransform(node.getScreenCTM().inverse());
    return [point.x, point.y];
  }

  var rect = node.getBoundingClientRect();
  return [event.clientX - rect.left - node.clientLeft, event.clientY - rect.top - node.clientTop];
};

var mouse = function (node) {
  var event = sourceEvent();
  if (event.changedTouches) event = event.changedTouches[0];
  return point$2(node, event);
};

function none$2() {}

var selector = function (selector) {
  return selector == null ? none$2 : function () {
    return this.querySelector(selector);
  };
};

var selection_select = function (select) {
  if (typeof select !== "function") select = selector(select);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
      if ((node = group[i]) && (subnode = select.call(node, node.__data__, i, group))) {
        if ("__data__" in node) subnode.__data__ = node.__data__;
        subgroup[i] = subnode;
      }
    }
  }

  return new Selection(subgroups, this._parents);
};

function empty$1() {
  return [];
}

var selectorAll = function (selector) {
  return selector == null ? empty$1 : function () {
    return this.querySelectorAll(selector);
  };
};

var selection_selectAll = function (select) {
  if (typeof select !== "function") select = selectorAll(select);

  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        subgroups.push(select.call(node, node.__data__, i, group));
        parents.push(node);
      }
    }
  }

  return new Selection(subgroups, parents);
};

var selection_filter = function (match) {
  if (typeof match !== "function") match = matcher$1(match);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
        subgroup.push(node);
      }
    }
  }

  return new Selection(subgroups, this._parents);
};

var sparse = function (update) {
  return new Array(update.length);
};

var selection_enter = function () {
  return new Selection(this._enter || this._groups.map(sparse), this._parents);
};

function EnterNode(parent, datum) {
  this.ownerDocument = parent.ownerDocument;
  this.namespaceURI = parent.namespaceURI;
  this._next = null;
  this._parent = parent;
  this.__data__ = datum;
}

EnterNode.prototype = {
  constructor: EnterNode,
  appendChild: function appendChild(child) {
    return this._parent.insertBefore(child, this._next);
  },
  insertBefore: function insertBefore(child, next) {
    return this._parent.insertBefore(child, next);
  },
  querySelector: function querySelector(selector) {
    return this._parent.querySelector(selector);
  },
  querySelectorAll: function querySelectorAll(selector) {
    return this._parent.querySelectorAll(selector);
  }
};

var constant$5 = function (x) {
  return function () {
    return x;
  };
};

var keyPrefix = "$"; // Protect against keys like “__proto__”.

function bindIndex(parent, group, enter, update, exit, data) {
  var i = 0,
      node,
      groupLength = group.length,
      dataLength = data.length;

  // Put any non-null nodes that fit into update.
  // Put any null nodes into enter.
  // Put any remaining data into enter.
  for (; i < dataLength; ++i) {
    if (node = group[i]) {
      node.__data__ = data[i];
      update[i] = node;
    } else {
      enter[i] = new EnterNode(parent, data[i]);
    }
  }

  // Put any non-null nodes that don’t fit into exit.
  for (; i < groupLength; ++i) {
    if (node = group[i]) {
      exit[i] = node;
    }
  }
}

function bindKey(parent, group, enter, update, exit, data, key) {
  var i,
      node,
      nodeByKeyValue = {},
      groupLength = group.length,
      dataLength = data.length,
      keyValues = new Array(groupLength),
      keyValue;

  // Compute the key for each node.
  // If multiple nodes have the same key, the duplicates are added to exit.
  for (i = 0; i < groupLength; ++i) {
    if (node = group[i]) {
      keyValues[i] = keyValue = keyPrefix + key.call(node, node.__data__, i, group);
      if (keyValue in nodeByKeyValue) {
        exit[i] = node;
      } else {
        nodeByKeyValue[keyValue] = node;
      }
    }
  }

  // Compute the key for each datum.
  // If there a node associated with this key, join and add it to update.
  // If there is not (or the key is a duplicate), add it to enter.
  for (i = 0; i < dataLength; ++i) {
    keyValue = keyPrefix + key.call(parent, data[i], i, data);
    if (node = nodeByKeyValue[keyValue]) {
      update[i] = node;
      node.__data__ = data[i];
      nodeByKeyValue[keyValue] = null;
    } else {
      enter[i] = new EnterNode(parent, data[i]);
    }
  }

  // Add any remaining nodes that were not bound to data to exit.
  for (i = 0; i < groupLength; ++i) {
    if ((node = group[i]) && nodeByKeyValue[keyValues[i]] === node) {
      exit[i] = node;
    }
  }
}

var selection_data = function (value, key) {
  if (!value) {
    data = new Array(this.size()), j = -1;
    this.each(function (d) {
      data[++j] = d;
    });
    return data;
  }

  var bind = key ? bindKey : bindIndex,
      parents = this._parents,
      groups = this._groups;

  if (typeof value !== "function") value = constant$5(value);

  for (var m = groups.length, update = new Array(m), enter = new Array(m), exit = new Array(m), j = 0; j < m; ++j) {
    var parent = parents[j],
        group = groups[j],
        groupLength = group.length,
        data = value.call(parent, parent && parent.__data__, j, parents),
        dataLength = data.length,
        enterGroup = enter[j] = new Array(dataLength),
        updateGroup = update[j] = new Array(dataLength),
        exitGroup = exit[j] = new Array(groupLength);

    bind(parent, group, enterGroup, updateGroup, exitGroup, data, key);

    // Now connect the enter nodes to their following update node, such that
    // appendChild can insert the materialized enter node before this node,
    // rather than at the end of the parent node.
    for (var i0 = 0, i1 = 0, previous, next; i0 < dataLength; ++i0) {
      if (previous = enterGroup[i0]) {
        if (i0 >= i1) i1 = i0 + 1;
        while (!(next = updateGroup[i1]) && ++i1 < dataLength) {}
        previous._next = next || null;
      }
    }
  }

  update = new Selection(update, parents);
  update._enter = enter;
  update._exit = exit;
  return update;
};

var selection_exit = function () {
  return new Selection(this._exit || this._groups.map(sparse), this._parents);
};

var selection_merge = function (selection) {

  for (var groups0 = this._groups, groups1 = selection._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group0[i] || group1[i]) {
        merge[i] = node;
      }
    }
  }

  for (; j < m0; ++j) {
    merges[j] = groups0[j];
  }

  return new Selection(merges, this._parents);
};

var selection_order = function () {

  for (var groups = this._groups, j = -1, m = groups.length; ++j < m;) {
    for (var group = groups[j], i = group.length - 1, next = group[i], node; --i >= 0;) {
      if (node = group[i]) {
        if (next && next !== node.nextSibling) next.parentNode.insertBefore(node, next);
        next = node;
      }
    }
  }

  return this;
};

var selection_sort = function (compare) {
  if (!compare) compare = ascending$2;

  function compareNode(a, b) {
    return a && b ? compare(a.__data__, b.__data__) : !a - !b;
  }

  for (var groups = this._groups, m = groups.length, sortgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, sortgroup = sortgroups[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        sortgroup[i] = node;
      }
    }
    sortgroup.sort(compareNode);
  }

  return new Selection(sortgroups, this._parents).order();
};

function ascending$2(a, b) {
  return a < b ? -1 : a > b ? 1 : a >= b ? 0 : NaN;
}

var selection_call = function () {
  var callback = arguments[0];
  arguments[0] = this;
  callback.apply(null, arguments);
  return this;
};

var selection_nodes = function () {
  var nodes = new Array(this.size()),
      i = -1;
  this.each(function () {
    nodes[++i] = this;
  });
  return nodes;
};

var selection_node = function () {

  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
    for (var group = groups[j], i = 0, n = group.length; i < n; ++i) {
      var node = group[i];
      if (node) return node;
    }
  }

  return null;
};

var selection_size = function () {
  var size = 0;
  this.each(function () {
    ++size;
  });
  return size;
};

var selection_empty = function () {
  return !this.node();
};

var selection_each = function (callback) {

  for (var groups = this._groups, j = 0, m = groups.length; j < m; ++j) {
    for (var group = groups[j], i = 0, n = group.length, node; i < n; ++i) {
      if (node = group[i]) callback.call(node, node.__data__, i, group);
    }
  }

  return this;
};

function attrRemove(name) {
  return function () {
    this.removeAttribute(name);
  };
}

function attrRemoveNS(fullname) {
  return function () {
    this.removeAttributeNS(fullname.space, fullname.local);
  };
}

function attrConstant(name, value) {
  return function () {
    this.setAttribute(name, value);
  };
}

function attrConstantNS(fullname, value) {
  return function () {
    this.setAttributeNS(fullname.space, fullname.local, value);
  };
}

function attrFunction(name, value) {
  return function () {
    var v = value.apply(this, arguments);
    if (v == null) this.removeAttribute(name);else this.setAttribute(name, v);
  };
}

function attrFunctionNS(fullname, value) {
  return function () {
    var v = value.apply(this, arguments);
    if (v == null) this.removeAttributeNS(fullname.space, fullname.local);else this.setAttributeNS(fullname.space, fullname.local, v);
  };
}

var selection_attr = function (name, value) {
  var fullname = namespace(name);

  if (arguments.length < 2) {
    var node = this.node();
    return fullname.local ? node.getAttributeNS(fullname.space, fullname.local) : node.getAttribute(fullname);
  }

  return this.each((value == null ? fullname.local ? attrRemoveNS : attrRemove : typeof value === "function" ? fullname.local ? attrFunctionNS : attrFunction : fullname.local ? attrConstantNS : attrConstant)(fullname, value));
};

var window$1 = function (node) {
    return node.ownerDocument && node.ownerDocument.defaultView || // node is a Node
    node.document && node // node is a Window
    || node.defaultView; // node is a Document
};

function styleRemove(name) {
  return function () {
    this.style.removeProperty(name);
  };
}

function styleConstant(name, value, priority) {
  return function () {
    this.style.setProperty(name, value, priority);
  };
}

function styleFunction(name, value, priority) {
  return function () {
    var v = value.apply(this, arguments);
    if (v == null) this.style.removeProperty(name);else this.style.setProperty(name, v, priority);
  };
}

var selection_style = function (name, value, priority) {
  var node;
  return arguments.length > 1 ? this.each((value == null ? styleRemove : typeof value === "function" ? styleFunction : styleConstant)(name, value, priority == null ? "" : priority)) : window$1(node = this.node()).getComputedStyle(node, null).getPropertyValue(name);
};

function propertyRemove(name) {
  return function () {
    delete this[name];
  };
}

function propertyConstant(name, value) {
  return function () {
    this[name] = value;
  };
}

function propertyFunction(name, value) {
  return function () {
    var v = value.apply(this, arguments);
    if (v == null) delete this[name];else this[name] = v;
  };
}

var selection_property = function (name, value) {
  return arguments.length > 1 ? this.each((value == null ? propertyRemove : typeof value === "function" ? propertyFunction : propertyConstant)(name, value)) : this.node()[name];
};

function classArray(string) {
  return string.trim().split(/^|\s+/);
}

function classList(node) {
  return node.classList || new ClassList(node);
}

function ClassList(node) {
  this._node = node;
  this._names = classArray(node.getAttribute("class") || "");
}

ClassList.prototype = {
  add: function add(name) {
    var i = this._names.indexOf(name);
    if (i < 0) {
      this._names.push(name);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  remove: function remove(name) {
    var i = this._names.indexOf(name);
    if (i >= 0) {
      this._names.splice(i, 1);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  contains: function contains(name) {
    return this._names.indexOf(name) >= 0;
  }
};

function classedAdd(node, names) {
  var list = classList(node),
      i = -1,
      n = names.length;
  while (++i < n) {
    list.add(names[i]);
  }
}

function classedRemove(node, names) {
  var list = classList(node),
      i = -1,
      n = names.length;
  while (++i < n) {
    list.remove(names[i]);
  }
}

function classedTrue(names) {
  return function () {
    classedAdd(this, names);
  };
}

function classedFalse(names) {
  return function () {
    classedRemove(this, names);
  };
}

function classedFunction(names, value) {
  return function () {
    (value.apply(this, arguments) ? classedAdd : classedRemove)(this, names);
  };
}

var selection_classed = function (name, value) {
  var names = classArray(name + "");

  if (arguments.length < 2) {
    var list = classList(this.node()),
        i = -1,
        n = names.length;
    while (++i < n) {
      if (!list.contains(names[i])) return false;
    }return true;
  }

  return this.each((typeof value === "function" ? classedFunction : value ? classedTrue : classedFalse)(names, value));
};

function textRemove() {
  this.textContent = "";
}

function textConstant(value) {
  return function () {
    this.textContent = value;
  };
}

function textFunction(value) {
  return function () {
    var v = value.apply(this, arguments);
    this.textContent = v == null ? "" : v;
  };
}

var selection_text = function (value) {
  return arguments.length ? this.each(value == null ? textRemove : (typeof value === "function" ? textFunction : textConstant)(value)) : this.node().textContent;
};

function htmlRemove() {
  this.innerHTML = "";
}

function htmlConstant(value) {
  return function () {
    this.innerHTML = value;
  };
}

function htmlFunction(value) {
  return function () {
    var v = value.apply(this, arguments);
    this.innerHTML = v == null ? "" : v;
  };
}

var selection_html = function (value) {
  return arguments.length ? this.each(value == null ? htmlRemove : (typeof value === "function" ? htmlFunction : htmlConstant)(value)) : this.node().innerHTML;
};

function raise$1() {
  if (this.nextSibling) this.parentNode.appendChild(this);
}

var selection_raise = function () {
  return this.each(raise$1);
};

function lower() {
  if (this.previousSibling) this.parentNode.insertBefore(this, this.parentNode.firstChild);
}

var selection_lower = function () {
  return this.each(lower);
};

var selection_append = function (name) {
  var create = typeof name === "function" ? name : creator(name);
  return this.select(function () {
    return this.appendChild(create.apply(this, arguments));
  });
};

function constantNull() {
  return null;
}

var selection_insert = function (name, before) {
  var create = typeof name === "function" ? name : creator(name),
      select = before == null ? constantNull : typeof before === "function" ? before : selector(before);
  return this.select(function () {
    return this.insertBefore(create.apply(this, arguments), select.apply(this, arguments) || null);
  });
};

function remove$1() {
  var parent = this.parentNode;
  if (parent) parent.removeChild(this);
}

var selection_remove = function () {
  return this.each(remove$1);
};

var selection_datum = function (value) {
    return arguments.length ? this.property("__data__", value) : this.node().__data__;
};

function dispatchEvent(node, type, params) {
  var window = window$1(node),
      event = window.CustomEvent;

  if (event) {
    event = new event(type, params);
  } else {
    event = window.document.createEvent("Event");
    if (params) event.initEvent(type, params.bubbles, params.cancelable), event.detail = params.detail;else event.initEvent(type, false, false);
  }

  node.dispatchEvent(event);
}

function dispatchConstant(type, params) {
  return function () {
    return dispatchEvent(this, type, params);
  };
}

function dispatchFunction(type, params) {
  return function () {
    return dispatchEvent(this, type, params.apply(this, arguments));
  };
}

var selection_dispatch = function (type, params) {
  return this.each((typeof params === "function" ? dispatchFunction : dispatchConstant)(type, params));
};

var root = [null];

function Selection(groups, parents) {
  this._groups = groups;
  this._parents = parents;
}

function selection() {
  return new Selection([[document.documentElement]], root);
}

Selection.prototype = selection.prototype = {
  constructor: Selection,
  select: selection_select,
  selectAll: selection_selectAll,
  filter: selection_filter,
  data: selection_data,
  enter: selection_enter,
  exit: selection_exit,
  merge: selection_merge,
  order: selection_order,
  sort: selection_sort,
  call: selection_call,
  nodes: selection_nodes,
  node: selection_node,
  size: selection_size,
  empty: selection_empty,
  each: selection_each,
  attr: selection_attr,
  style: selection_style,
  property: selection_property,
  classed: selection_classed,
  text: selection_text,
  html: selection_html,
  raise: selection_raise,
  lower: selection_lower,
  append: selection_append,
  insert: selection_insert,
  remove: selection_remove,
  datum: selection_datum,
  on: selection_on,
  dispatch: selection_dispatch
};

var select = function (selector) {
    return typeof selector === "string" ? new Selection([[document.querySelector(selector)]], [document.documentElement]) : new Selection([[selector]], root);
};

var selectAll = function (selector) {
    return typeof selector === "string" ? new Selection([document.querySelectorAll(selector)], [document.documentElement]) : new Selection([selector == null ? [] : selector], root);
};

var touch = function (node, touches, identifier) {
  if (arguments.length < 3) identifier = touches, touches = sourceEvent().changedTouches;

  for (var i = 0, n = touches ? touches.length : 0, touch; i < n; ++i) {
    if ((touch = touches[i]).identifier === identifier) {
      return point$2(node, touch);
    }
  }

  return null;
};

var touches = function (node, touches) {
  if (touches == null) touches = sourceEvent().touches;

  for (var i = 0, n = touches ? touches.length : 0, points = new Array(n); i < n; ++i) {
    points[i] = point$2(node, touches[i]);
  }

  return points;
};

var emptyOn = dispatch("start", "end", "interrupt");
var emptyTween = [];

var CREATED = 0;
var SCHEDULED = 1;
var STARTING = 2;
var STARTED = 3;
var RUNNING = 4;
var ENDING = 5;
var ENDED = 6;

var schedule = function (node, name, id, index, group, timing) {
  var schedules = node.__transition;
  if (!schedules) node.__transition = {};else if (id in schedules) return;
  create$1(node, id, {
    name: name,
    index: index, // For context during callback.
    group: group, // For context during callback.
    on: emptyOn,
    tween: emptyTween,
    time: timing.time,
    delay: timing.delay,
    duration: timing.duration,
    ease: timing.ease,
    timer: null,
    state: CREATED
  });
};

function init$1(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id]) || schedule.state > CREATED) throw new Error("too late");
  return schedule;
}

function set$5(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id]) || schedule.state > STARTING) throw new Error("too late");
  return schedule;
}

function get$3(node, id) {
  var schedule = node.__transition;
  if (!schedule || !(schedule = schedule[id])) throw new Error("too late");
  return schedule;
}

function create$1(node, id, self) {
  var schedules = node.__transition,
      tween;

  // Initialize the self timer when the transition is created.
  // Note the actual delay is not known until the first callback!
  schedules[id] = self;
  self.timer = timer(schedule, 0, self.time);

  function schedule(elapsed) {
    self.state = SCHEDULED;
    self.timer.restart(start, self.delay, self.time);

    // If the elapsed delay is less than our first sleep, start immediately.
    if (self.delay <= elapsed) start(elapsed - self.delay);
  }

  function start(elapsed) {
    var i, j, n, o;

    // If the state is not SCHEDULED, then we previously errored on start.
    if (self.state !== SCHEDULED) return stop();

    for (i in schedules) {
      o = schedules[i];
      if (o.name !== self.name) continue;

      // While this element already has a starting transition during this frame,
      // defer starting an interrupting transition until that transition has a
      // chance to tick (and possibly end); see d3/d3-transition#54!
      if (o.state === STARTED) return timeout$1(start);

      // Interrupt the active transition, if any.
      // Dispatch the interrupt event.
      if (o.state === RUNNING) {
        o.state = ENDED;
        o.timer.stop();
        o.on.call("interrupt", node, node.__data__, o.index, o.group);
        delete schedules[i];
      }

      // Cancel any pre-empted transitions. No interrupt event is dispatched
      // because the cancelled transitions never started. Note that this also
      // removes this transition from the pending list!
      else if (+i < id) {
          o.state = ENDED;
          o.timer.stop();
          delete schedules[i];
        }
    }

    // Defer the first tick to end of the current frame; see d3/d3#1576.
    // Note the transition may be canceled after start and before the first tick!
    // Note this must be scheduled before the start event; see d3/d3-transition#16!
    // Assuming this is successful, subsequent callbacks go straight to tick.
    timeout$1(function () {
      if (self.state === STARTED) {
        self.state = RUNNING;
        self.timer.restart(tick, self.delay, self.time);
        tick(elapsed);
      }
    });

    // Dispatch the start event.
    // Note this must be done before the tween are initialized.
    self.state = STARTING;
    self.on.call("start", node, node.__data__, self.index, self.group);
    if (self.state !== STARTING) return; // interrupted
    self.state = STARTED;

    // Initialize the tween, deleting null tween.
    tween = new Array(n = self.tween.length);
    for (i = 0, j = -1; i < n; ++i) {
      if (o = self.tween[i].value.call(node, node.__data__, self.index, self.group)) {
        tween[++j] = o;
      }
    }
    tween.length = j + 1;
  }

  function tick(elapsed) {
    var t = elapsed < self.duration ? self.ease.call(null, elapsed / self.duration) : (self.timer.restart(stop), self.state = ENDING, 1),
        i = -1,
        n = tween.length;

    while (++i < n) {
      tween[i].call(null, t);
    }

    // Dispatch the end event.
    if (self.state === ENDING) {
      self.on.call("end", node, node.__data__, self.index, self.group);
      stop();
    }
  }

  function stop() {
    self.state = ENDED;
    self.timer.stop();
    delete schedules[id];
    for (var i in schedules) {
      return;
    } // eslint-disable-line no-unused-vars
    delete node.__transition;
  }
}

var interrupt = function (node, name) {
  var schedules = node.__transition,
      schedule,
      active,
      empty = true,
      i;

  if (!schedules) return;

  name = name == null ? null : name + "";

  for (i in schedules) {
    if ((schedule = schedules[i]).name !== name) {
      empty = false;continue;
    }
    active = schedule.state > STARTING && schedule.state < ENDING;
    schedule.state = ENDED;
    schedule.timer.stop();
    if (active) schedule.on.call("interrupt", node, node.__data__, schedule.index, schedule.group);
    delete schedules[i];
  }

  if (empty) delete node.__transition;
};

var selection_interrupt = function (name) {
  return this.each(function () {
    interrupt(this, name);
  });
};

function tweenRemove(id, name) {
  var tween0, tween1;
  return function () {
    var schedule = set$5(this, id),
        tween = schedule.tween;

    // If this node shared tween with the previous node,
    // just assign the updated shared tween and we’re done!
    // Otherwise, copy-on-write.
    if (tween !== tween0) {
      tween1 = tween0 = tween;
      for (var i = 0, n = tween1.length; i < n; ++i) {
        if (tween1[i].name === name) {
          tween1 = tween1.slice();
          tween1.splice(i, 1);
          break;
        }
      }
    }

    schedule.tween = tween1;
  };
}

function tweenFunction(id, name, value) {
  var tween0, tween1;
  if (typeof value !== "function") throw new Error();
  return function () {
    var schedule = set$5(this, id),
        tween = schedule.tween;

    // If this node shared tween with the previous node,
    // just assign the updated shared tween and we’re done!
    // Otherwise, copy-on-write.
    if (tween !== tween0) {
      tween1 = (tween0 = tween).slice();
      for (var t = { name: name, value: value }, i = 0, n = tween1.length; i < n; ++i) {
        if (tween1[i].name === name) {
          tween1[i] = t;
          break;
        }
      }
      if (i === n) tween1.push(t);
    }

    schedule.tween = tween1;
  };
}

var transition_tween = function (name, value) {
  var id = this._id;

  name += "";

  if (arguments.length < 2) {
    var tween = get$3(this.node(), id).tween;
    for (var i = 0, n = tween.length, t; i < n; ++i) {
      if ((t = tween[i]).name === name) {
        return t.value;
      }
    }
    return null;
  }

  return this.each((value == null ? tweenRemove : tweenFunction)(id, name, value));
};

function tweenValue(transition, name, value) {
  var id = transition._id;

  transition.each(function () {
    var schedule = set$5(this, id);
    (schedule.value || (schedule.value = {}))[name] = value.apply(this, arguments);
  });

  return function (node) {
    return get$3(node, id).value[name];
  };
}

var interpolate$1 = function (a, b) {
    var c;
    return (typeof b === "number" ? interpolateNumber : b instanceof color ? interpolateRgb : (c = color(b)) ? (b = c, interpolateRgb) : interpolateString)(a, b);
};

function attrRemove$1(name) {
  return function () {
    this.removeAttribute(name);
  };
}

function attrRemoveNS$1(fullname) {
  return function () {
    this.removeAttributeNS(fullname.space, fullname.local);
  };
}

function attrConstant$1(name, interpolate$$1, value1) {
  var value00, interpolate0;
  return function () {
    var value0 = this.getAttribute(name);
    return value0 === value1 ? null : value0 === value00 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value1);
  };
}

function attrConstantNS$1(fullname, interpolate$$1, value1) {
  var value00, interpolate0;
  return function () {
    var value0 = this.getAttributeNS(fullname.space, fullname.local);
    return value0 === value1 ? null : value0 === value00 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value1);
  };
}

function attrFunction$1(name, interpolate$$1, value) {
  var value00, value10, interpolate0;
  return function () {
    var value0,
        value1 = value(this);
    if (value1 == null) return void this.removeAttribute(name);
    value0 = this.getAttribute(name);
    return value0 === value1 ? null : value0 === value00 && value1 === value10 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
  };
}

function attrFunctionNS$1(fullname, interpolate$$1, value) {
  var value00, value10, interpolate0;
  return function () {
    var value0,
        value1 = value(this);
    if (value1 == null) return void this.removeAttributeNS(fullname.space, fullname.local);
    value0 = this.getAttributeNS(fullname.space, fullname.local);
    return value0 === value1 ? null : value0 === value00 && value1 === value10 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
  };
}

var transition_attr = function (name, value) {
  var fullname = namespace(name),
      i = fullname === "transform" ? interpolateTransformSvg : interpolate$1;
  return this.attrTween(name, typeof value === "function" ? (fullname.local ? attrFunctionNS$1 : attrFunction$1)(fullname, i, tweenValue(this, "attr." + name, value)) : value == null ? (fullname.local ? attrRemoveNS$1 : attrRemove$1)(fullname) : (fullname.local ? attrConstantNS$1 : attrConstant$1)(fullname, i, value));
};

function attrTweenNS(fullname, value) {
  function tween() {
    var node = this,
        i = value.apply(node, arguments);
    return i && function (t) {
      node.setAttributeNS(fullname.space, fullname.local, i(t));
    };
  }
  tween._value = value;
  return tween;
}

function attrTween(name, value) {
  function tween() {
    var node = this,
        i = value.apply(node, arguments);
    return i && function (t) {
      node.setAttribute(name, i(t));
    };
  }
  tween._value = value;
  return tween;
}

var transition_attrTween = function (name, value) {
  var key = "attr." + name;
  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
  if (value == null) return this.tween(key, null);
  if (typeof value !== "function") throw new Error();
  var fullname = namespace(name);
  return this.tween(key, (fullname.local ? attrTweenNS : attrTween)(fullname, value));
};

function delayFunction(id, value) {
  return function () {
    init$1(this, id).delay = +value.apply(this, arguments);
  };
}

function delayConstant(id, value) {
  return value = +value, function () {
    init$1(this, id).delay = value;
  };
}

var transition_delay = function (value) {
  var id = this._id;

  return arguments.length ? this.each((typeof value === "function" ? delayFunction : delayConstant)(id, value)) : get$3(this.node(), id).delay;
};

function durationFunction(id, value) {
  return function () {
    set$5(this, id).duration = +value.apply(this, arguments);
  };
}

function durationConstant(id, value) {
  return value = +value, function () {
    set$5(this, id).duration = value;
  };
}

var transition_duration = function (value) {
  var id = this._id;

  return arguments.length ? this.each((typeof value === "function" ? durationFunction : durationConstant)(id, value)) : get$3(this.node(), id).duration;
};

function easeConstant(id, value) {
  if (typeof value !== "function") throw new Error();
  return function () {
    set$5(this, id).ease = value;
  };
}

var transition_ease = function (value) {
  var id = this._id;

  return arguments.length ? this.each(easeConstant(id, value)) : get$3(this.node(), id).ease;
};

var transition_filter = function (match) {
  if (typeof match !== "function") match = matcher$1(match);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = [], node, i = 0; i < n; ++i) {
      if ((node = group[i]) && match.call(node, node.__data__, i, group)) {
        subgroup.push(node);
      }
    }
  }

  return new Transition(subgroups, this._parents, this._name, this._id);
};

var transition_merge = function (transition) {
  if (transition._id !== this._id) throw new Error();

  for (var groups0 = this._groups, groups1 = transition._groups, m0 = groups0.length, m1 = groups1.length, m = Math.min(m0, m1), merges = new Array(m0), j = 0; j < m; ++j) {
    for (var group0 = groups0[j], group1 = groups1[j], n = group0.length, merge = merges[j] = new Array(n), node, i = 0; i < n; ++i) {
      if (node = group0[i] || group1[i]) {
        merge[i] = node;
      }
    }
  }

  for (; j < m0; ++j) {
    merges[j] = groups0[j];
  }

  return new Transition(merges, this._parents, this._name, this._id);
};

function start$1(name) {
  return (name + "").trim().split(/^|\s+/).every(function (t) {
    var i = t.indexOf(".");
    if (i >= 0) t = t.slice(0, i);
    return !t || t === "start";
  });
}

function onFunction(id, name, listener) {
  var on0,
      on1,
      sit = start$1(name) ? init$1 : set$5;
  return function () {
    var schedule = sit(this, id),
        on = schedule.on;

    // If this node shared a dispatch with the previous node,
    // just assign the updated shared dispatch and we’re done!
    // Otherwise, copy-on-write.
    if (on !== on0) (on1 = (on0 = on).copy()).on(name, listener);

    schedule.on = on1;
  };
}

var transition_on = function (name, listener) {
  var id = this._id;

  return arguments.length < 2 ? get$3(this.node(), id).on.on(name) : this.each(onFunction(id, name, listener));
};

function removeFunction(id) {
  return function () {
    var parent = this.parentNode;
    for (var i in this.__transition) {
      if (+i !== id) return;
    }if (parent) parent.removeChild(this);
  };
}

var transition_remove = function () {
  return this.on("end.remove", removeFunction(this._id));
};

var transition_select = function (select$$1) {
  var name = this._name,
      id = this._id;

  if (typeof select$$1 !== "function") select$$1 = selector(select$$1);

  for (var groups = this._groups, m = groups.length, subgroups = new Array(m), j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, subgroup = subgroups[j] = new Array(n), node, subnode, i = 0; i < n; ++i) {
      if ((node = group[i]) && (subnode = select$$1.call(node, node.__data__, i, group))) {
        if ("__data__" in node) subnode.__data__ = node.__data__;
        subgroup[i] = subnode;
        schedule(subgroup[i], name, id, i, subgroup, get$3(node, id));
      }
    }
  }

  return new Transition(subgroups, this._parents, name, id);
};

var transition_selectAll = function (select$$1) {
  var name = this._name,
      id = this._id;

  if (typeof select$$1 !== "function") select$$1 = selectorAll(select$$1);

  for (var groups = this._groups, m = groups.length, subgroups = [], parents = [], j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        for (var children = select$$1.call(node, node.__data__, i, group), child, inherit = get$3(node, id), k = 0, l = children.length; k < l; ++k) {
          if (child = children[k]) {
            schedule(child, name, id, k, children, inherit);
          }
        }
        subgroups.push(children);
        parents.push(node);
      }
    }
  }

  return new Transition(subgroups, parents, name, id);
};

var Selection$1 = selection.prototype.constructor;

var transition_selection = function () {
  return new Selection$1(this._groups, this._parents);
};

function styleRemove$1(name, interpolate$$1) {
    var value00, value10, interpolate0;
    return function () {
        var style = window$1(this).getComputedStyle(this, null),
            value0 = style.getPropertyValue(name),
            value1 = (this.style.removeProperty(name), style.getPropertyValue(name));
        return value0 === value1 ? null : value0 === value00 && value1 === value10 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
    };
}

function styleRemoveEnd(name) {
    return function () {
        this.style.removeProperty(name);
    };
}

function styleConstant$1(name, interpolate$$1, value1) {
    var value00, interpolate0;
    return function () {
        var value0 = window$1(this).getComputedStyle(this, null).getPropertyValue(name);
        return value0 === value1 ? null : value0 === value00 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value1);
    };
}

function styleFunction$1(name, interpolate$$1, value) {
    var value00, value10, interpolate0;
    return function () {
        var style = window$1(this).getComputedStyle(this, null),
            value0 = style.getPropertyValue(name),
            value1 = value(this);
        if (value1 == null) value1 = (this.style.removeProperty(name), style.getPropertyValue(name));
        return value0 === value1 ? null : value0 === value00 && value1 === value10 ? interpolate0 : interpolate0 = interpolate$$1(value00 = value0, value10 = value1);
    };
}

var transition_style = function (name, value, priority) {
    var i = (name += "") === "transform" ? interpolateTransformCss : interpolate$1;
    return value == null ? this.styleTween(name, styleRemove$1(name, i)).on("end.style." + name, styleRemoveEnd(name)) : this.styleTween(name, typeof value === "function" ? styleFunction$1(name, i, tweenValue(this, "style." + name, value)) : styleConstant$1(name, i, value), priority);
};

function styleTween(name, value, priority) {
  function tween() {
    var node = this,
        i = value.apply(node, arguments);
    return i && function (t) {
      node.style.setProperty(name, i(t), priority);
    };
  }
  tween._value = value;
  return tween;
}

var transition_styleTween = function (name, value, priority) {
  var key = "style." + (name += "");
  if (arguments.length < 2) return (key = this.tween(key)) && key._value;
  if (value == null) return this.tween(key, null);
  if (typeof value !== "function") throw new Error();
  return this.tween(key, styleTween(name, value, priority == null ? "" : priority));
};

function textConstant$1(value) {
  return function () {
    this.textContent = value;
  };
}

function textFunction$1(value) {
  return function () {
    var value1 = value(this);
    this.textContent = value1 == null ? "" : value1;
  };
}

var transition_text = function (value) {
  return this.tween("text", typeof value === "function" ? textFunction$1(tweenValue(this, "text", value)) : textConstant$1(value == null ? "" : value + ""));
};

var transition_transition = function () {
  var name = this._name,
      id0 = this._id,
      id1 = newId();

  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        var inherit = get$3(node, id0);
        schedule(node, name, id1, i, group, {
          time: inherit.time + inherit.delay + inherit.duration,
          delay: 0,
          duration: inherit.duration,
          ease: inherit.ease
        });
      }
    }
  }

  return new Transition(groups, this._parents, name, id1);
};

var id = 0;

function Transition(groups, parents, name, id) {
  this._groups = groups;
  this._parents = parents;
  this._name = name;
  this._id = id;
}

function transition(name) {
  return selection().transition(name);
}

function newId() {
  return ++id;
}

var selection_prototype = selection.prototype;

Transition.prototype = transition.prototype = {
  constructor: Transition,
  select: transition_select,
  selectAll: transition_selectAll,
  filter: transition_filter,
  merge: transition_merge,
  selection: transition_selection,
  transition: transition_transition,
  call: selection_prototype.call,
  nodes: selection_prototype.nodes,
  node: selection_prototype.node,
  size: selection_prototype.size,
  empty: selection_prototype.empty,
  each: selection_prototype.each,
  on: transition_on,
  attr: transition_attr,
  attrTween: transition_attrTween,
  style: transition_style,
  styleTween: transition_styleTween,
  text: transition_text,
  remove: transition_remove,
  tween: transition_tween,
  delay: transition_delay,
  duration: transition_duration,
  ease: transition_ease
};

var defaultTiming = {
  time: null, // Set on use.
  delay: 0,
  duration: 250,
  ease: cubicInOut
};

function inherit(node, id) {
  var timing;
  while (!(timing = node.__transition) || !(timing = timing[id])) {
    if (!(node = node.parentNode)) {
      return defaultTiming.time = now(), defaultTiming;
    }
  }
  return timing;
}

var selection_transition = function (name) {
  var id, timing;

  if (name instanceof Transition) {
    id = name._id, name = name._name;
  } else {
    id = newId(), (timing = defaultTiming).time = now(), name = name == null ? null : name + "";
  }

  for (var groups = this._groups, m = groups.length, j = 0; j < m; ++j) {
    for (var group = groups[j], n = group.length, node, i = 0; i < n; ++i) {
      if (node = group[i]) {
        schedule(node, name, id, i, group, timing || inherit(node, id));
      }
    }
  }

  return new Transition(groups, this._parents, name, id);
};

selection.prototype.interrupt = selection_interrupt;
selection.prototype.transition = selection_transition;

var root$1 = [null];

var active = function (node, name) {
  var schedules = node.__transition,
      schedule,
      i;

  if (schedules) {
    name = name == null ? null : name + "";
    for (i in schedules) {
      if ((schedule = schedules[i]).state > SCHEDULED && schedule.name === name) {
        return new Transition([[node]], root$1, name, +i);
      }
    }
  }

  return null;
};

var slice$3 = Array.prototype.slice;

var identity$5 = function (x) {
  return x;
};

var top = 1;
var right$1 = 2;
var bottom = 3;
var left$1 = 4;
var epsilon$2 = 1e-6;

function translateX(scale0, scale1, d) {
  var x = scale0(d);
  return "translate(" + (isFinite(x) ? x : scale1(d)) + ",0)";
}

function translateY(scale0, scale1, d) {
  var y = scale0(d);
  return "translate(0," + (isFinite(y) ? y : scale1(d)) + ")";
}

function center(scale) {
  var offset = scale.bandwidth() / 2;
  if (scale.round()) offset = Math.round(offset);
  return function (d) {
    return scale(d) + offset;
  };
}

function entering() {
  return !this.__axis;
}

function axis(orient, scale) {
  var tickArguments = [],
      tickValues = null,
      tickFormat = null,
      tickSizeInner = 6,
      tickSizeOuter = 6,
      tickPadding = 3;

  function axis(context) {
    var values = tickValues == null ? scale.ticks ? scale.ticks.apply(scale, tickArguments) : scale.domain() : tickValues,
        format = tickFormat == null ? scale.tickFormat ? scale.tickFormat.apply(scale, tickArguments) : identity$5 : tickFormat,
        spacing = Math.max(tickSizeInner, 0) + tickPadding,
        transform = orient === top || orient === bottom ? translateX : translateY,
        range = scale.range(),
        range0 = range[0] + 0.5,
        range1 = range[range.length - 1] + 0.5,
        position = (scale.bandwidth ? center : identity$5)(scale.copy()),
        selection = context.selection ? context.selection() : context,
        path = selection.selectAll(".domain").data([null]),
        tick = selection.selectAll(".tick").data(values, scale).order(),
        tickExit = tick.exit(),
        tickEnter = tick.enter().append("g").attr("class", "tick"),
        line = tick.select("line"),
        text = tick.select("text"),
        k = orient === top || orient === left$1 ? -1 : 1,
        x,
        y = orient === left$1 || orient === right$1 ? (x = "x", "y") : (x = "y", "x");

    path = path.merge(path.enter().insert("path", ".tick").attr("class", "domain").attr("stroke", "#000"));

    tick = tick.merge(tickEnter);

    line = line.merge(tickEnter.append("line").attr("stroke", "#000").attr(x + "2", k * tickSizeInner).attr(y + "1", 0.5).attr(y + "2", 0.5));

    text = text.merge(tickEnter.append("text").attr("fill", "#000").attr(x, k * spacing).attr(y, 0.5).attr("dy", orient === top ? "0em" : orient === bottom ? "0.71em" : "0.32em"));

    if (context !== selection) {
      path = path.transition(context);
      tick = tick.transition(context);
      line = line.transition(context);
      text = text.transition(context);

      tickExit = tickExit.transition(context).attr("opacity", epsilon$2).attr("transform", function (d) {
        return transform(position, this.parentNode.__axis || position, d);
      });

      tickEnter.attr("opacity", epsilon$2).attr("transform", function (d) {
        return transform(this.parentNode.__axis || position, position, d);
      });
    }

    tickExit.remove();

    path.attr("d", orient === left$1 || orient == right$1 ? "M" + k * tickSizeOuter + "," + range0 + "H0.5V" + range1 + "H" + k * tickSizeOuter : "M" + range0 + "," + k * tickSizeOuter + "V0.5H" + range1 + "V" + k * tickSizeOuter);

    tick.attr("opacity", 1).attr("transform", function (d) {
      return transform(position, position, d);
    });

    line.attr(x + "2", k * tickSizeInner);

    text.attr(x, k * spacing).text(format);

    selection.filter(entering).attr("fill", "none").attr("font-size", 10).attr("font-family", "sans-serif").attr("text-anchor", orient === right$1 ? "start" : orient === left$1 ? "end" : "middle");

    selection.each(function () {
      this.__axis = position;
    });
  }

  axis.scale = function (_) {
    return arguments.length ? (scale = _, axis) : scale;
  };

  axis.ticks = function () {
    return tickArguments = slice$3.call(arguments), axis;
  };

  axis.tickArguments = function (_) {
    return arguments.length ? (tickArguments = _ == null ? [] : slice$3.call(_), axis) : tickArguments.slice();
  };

  axis.tickValues = function (_) {
    return arguments.length ? (tickValues = _ == null ? null : slice$3.call(_), axis) : tickValues && tickValues.slice();
  };

  axis.tickFormat = function (_) {
    return arguments.length ? (tickFormat = _, axis) : tickFormat;
  };

  axis.tickSize = function (_) {
    return arguments.length ? (tickSizeInner = tickSizeOuter = +_, axis) : tickSizeInner;
  };

  axis.tickSizeInner = function (_) {
    return arguments.length ? (tickSizeInner = +_, axis) : tickSizeInner;
  };

  axis.tickSizeOuter = function (_) {
    return arguments.length ? (tickSizeOuter = +_, axis) : tickSizeOuter;
  };

  axis.tickPadding = function (_) {
    return arguments.length ? (tickPadding = +_, axis) : tickPadding;
  };

  return axis;
}

function axisTop(scale) {
  return axis(top, scale);
}

function axisRight(scale) {
  return axis(right$1, scale);
}

function axisBottom(scale) {
  return axis(bottom, scale);
}

function axisLeft(scale) {
  return axis(left$1, scale);
}

function defaultSeparation(a, b) {
  return a.parent === b.parent ? 1 : 2;
}

function meanX(children) {
  return children.reduce(meanXReduce, 0) / children.length;
}

function meanXReduce(x, c) {
  return x + c.x;
}

function maxY(children) {
  return 1 + children.reduce(maxYReduce, 0);
}

function maxYReduce(y, c) {
  return Math.max(y, c.y);
}

function leafLeft(node) {
  var children;
  while (children = node.children) {
    node = children[0];
  }return node;
}

function leafRight(node) {
  var children;
  while (children = node.children) {
    node = children[children.length - 1];
  }return node;
}

var cluster = function () {
  var separation = defaultSeparation,
      dx = 1,
      dy = 1,
      nodeSize = false;

  function cluster(root) {
    var previousNode,
        x = 0;

    // First walk, computing the initial x & y values.
    root.eachAfter(function (node) {
      var children = node.children;
      if (children) {
        node.x = meanX(children);
        node.y = maxY(children);
      } else {
        node.x = previousNode ? x += separation(node, previousNode) : 0;
        node.y = 0;
        previousNode = node;
      }
    });

    var left = leafLeft(root),
        right = leafRight(root),
        x0 = left.x - separation(left, right) / 2,
        x1 = right.x + separation(right, left) / 2;

    // Second walk, normalizing x & y to the desired size.
    return root.eachAfter(nodeSize ? function (node) {
      node.x = (node.x - root.x) * dx;
      node.y = (root.y - node.y) * dy;
    } : function (node) {
      node.x = (node.x - x0) / (x1 - x0) * dx;
      node.y = (1 - (root.y ? node.y / root.y : 1)) * dy;
    });
  }

  cluster.separation = function (x) {
    return arguments.length ? (separation = x, cluster) : separation;
  };

  cluster.size = function (x) {
    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], cluster) : nodeSize ? null : [dx, dy];
  };

  cluster.nodeSize = function (x) {
    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], cluster) : nodeSize ? [dx, dy] : null;
  };

  return cluster;
};

var node_each = function (callback) {
  var node = this,
      current,
      next = [node],
      children,
      i,
      n;
  do {
    current = next.reverse(), next = [];
    while (node = current.pop()) {
      callback(node), children = node.children;
      if (children) for (i = 0, n = children.length; i < n; ++i) {
        next.push(children[i]);
      }
    }
  } while (next.length);
  return this;
};

var node_eachBefore = function (callback) {
  var node = this,
      nodes = [node],
      children,
      i;
  while (node = nodes.pop()) {
    callback(node), children = node.children;
    if (children) for (i = children.length - 1; i >= 0; --i) {
      nodes.push(children[i]);
    }
  }
  return this;
};

var node_eachAfter = function (callback) {
  var node = this,
      nodes = [node],
      next = [],
      children,
      i,
      n;
  while (node = nodes.pop()) {
    next.push(node), children = node.children;
    if (children) for (i = 0, n = children.length; i < n; ++i) {
      nodes.push(children[i]);
    }
  }
  while (node = next.pop()) {
    callback(node);
  }
  return this;
};

var node_sum = function (value) {
  return this.eachAfter(function (node) {
    var sum = +value(node.data) || 0,
        children = node.children,
        i = children && children.length;
    while (--i >= 0) {
      sum += children[i].value;
    }node.value = sum;
  });
};

var node_sort = function (compare) {
  return this.eachBefore(function (node) {
    if (node.children) {
      node.children.sort(compare);
    }
  });
};

var node_path = function (end) {
  var start = this,
      ancestor = leastCommonAncestor(start, end),
      nodes = [start];
  while (start !== ancestor) {
    start = start.parent;
    nodes.push(start);
  }
  var k = nodes.length;
  while (end !== ancestor) {
    nodes.splice(k, 0, end);
    end = end.parent;
  }
  return nodes;
};

function leastCommonAncestor(a, b) {
  if (a === b) return a;
  var aNodes = a.ancestors(),
      bNodes = b.ancestors(),
      c = null;
  a = aNodes.pop();
  b = bNodes.pop();
  while (a === b) {
    c = a;
    a = aNodes.pop();
    b = bNodes.pop();
  }
  return c;
}

var node_ancestors = function () {
  var node = this,
      nodes = [node];
  while (node = node.parent) {
    nodes.push(node);
  }
  return nodes;
};

var node_descendants = function () {
  var nodes = [];
  this.each(function (node) {
    nodes.push(node);
  });
  return nodes;
};

var node_leaves = function () {
  var leaves = [];
  this.eachBefore(function (node) {
    if (!node.children) {
      leaves.push(node);
    }
  });
  return leaves;
};

var node_links = function () {
  var root = this,
      links = [];
  root.each(function (node) {
    if (node !== root) {
      // Don’t include the root’s parent, if any.
      links.push({ source: node.parent, target: node });
    }
  });
  return links;
};

function hierarchy(data, children) {
  var root = new Node(data),
      valued = +data.value && (root.value = data.value),
      node,
      nodes = [root],
      child,
      childs,
      i,
      n;

  if (children == null) children = defaultChildren;

  while (node = nodes.pop()) {
    if (valued) node.value = +node.data.value;
    if ((childs = children(node.data)) && (n = childs.length)) {
      node.children = new Array(n);
      for (i = n - 1; i >= 0; --i) {
        nodes.push(child = node.children[i] = new Node(childs[i]));
        child.parent = node;
        child.depth = node.depth + 1;
      }
    }
  }

  return root.eachBefore(computeHeight);
}

function node_copy() {
  return hierarchy(this).eachBefore(copyData);
}

function defaultChildren(d) {
  return d.children;
}

function copyData(node) {
  node.data = node.data.data;
}

function computeHeight(node) {
  var height = 0;
  do {
    node.height = height;
  } while ((node = node.parent) && node.height < ++height);
}

function Node(data) {
  this.data = data;
  this.depth = this.height = 0;
  this.parent = null;
}

Node.prototype = hierarchy.prototype = {
  constructor: Node,
  each: node_each,
  eachAfter: node_eachAfter,
  eachBefore: node_eachBefore,
  sum: node_sum,
  sort: node_sort,
  path: node_path,
  ancestors: node_ancestors,
  descendants: node_descendants,
  leaves: node_leaves,
  links: node_links,
  copy: node_copy
};

function Node$2(value) {
  this._ = value;
  this.next = null;
}

var shuffle$1 = function (array) {
  var i,
      n = (array = array.slice()).length,
      head = null,
      node = head;

  while (n) {
    var next = new Node$2(array[n - 1]);
    if (node) node = node.next = next;else node = head = next;
    array[i] = array[--n];
  }

  return {
    head: head,
    tail: node
  };
};

var enclose = function (circles) {
  return encloseN(shuffle$1(circles), []);
};

function encloses(a, b) {
  var dx = b.x - a.x,
      dy = b.y - a.y,
      dr = a.r - b.r;
  return dr * dr + 1e-6 > dx * dx + dy * dy;
}

// Returns the smallest circle that contains circles L and intersects circles B.
function encloseN(L, B) {
  var circle,
      l0 = null,
      l1 = L.head,
      l2,
      p1;

  switch (B.length) {
    case 1:
      circle = enclose1(B[0]);break;
    case 2:
      circle = enclose2(B[0], B[1]);break;
    case 3:
      circle = enclose3(B[0], B[1], B[2]);break;
  }

  while (l1) {
    p1 = l1._, l2 = l1.next;
    if (!circle || !encloses(circle, p1)) {

      // Temporarily truncate L before l1.
      if (l0) L.tail = l0, l0.next = null;else L.head = L.tail = null;

      B.push(p1);
      circle = encloseN(L, B); // Note: reorders L!
      B.pop();

      // Move l1 to the front of L and reconnect the truncated list L.
      if (L.head) l1.next = L.head, L.head = l1;else l1.next = null, L.head = L.tail = l1;
      l0 = L.tail, l0.next = l2;
    } else {
      l0 = l1;
    }
    l1 = l2;
  }

  L.tail = l0;
  return circle;
}

function enclose1(a) {
  return {
    x: a.x,
    y: a.y,
    r: a.r
  };
}

function enclose2(a, b) {
  var x1 = a.x,
      y1 = a.y,
      r1 = a.r,
      x2 = b.x,
      y2 = b.y,
      r2 = b.r,
      x21 = x2 - x1,
      y21 = y2 - y1,
      r21 = r2 - r1,
      l = Math.sqrt(x21 * x21 + y21 * y21);
  return {
    x: (x1 + x2 + x21 / l * r21) / 2,
    y: (y1 + y2 + y21 / l * r21) / 2,
    r: (l + r1 + r2) / 2
  };
}

function enclose3(a, b, c) {
  var x1 = a.x,
      y1 = a.y,
      r1 = a.r,
      x2 = b.x,
      y2 = b.y,
      r2 = b.r,
      x3 = c.x,
      y3 = c.y,
      r3 = c.r,
      a2 = 2 * (x1 - x2),
      b2 = 2 * (y1 - y2),
      c2 = 2 * (r2 - r1),
      d2 = x1 * x1 + y1 * y1 - r1 * r1 - x2 * x2 - y2 * y2 + r2 * r2,
      a3 = 2 * (x1 - x3),
      b3 = 2 * (y1 - y3),
      c3 = 2 * (r3 - r1),
      d3 = x1 * x1 + y1 * y1 - r1 * r1 - x3 * x3 - y3 * y3 + r3 * r3,
      ab = a3 * b2 - a2 * b3,
      xa = (b2 * d3 - b3 * d2) / ab - x1,
      xb = (b3 * c2 - b2 * c3) / ab,
      ya = (a3 * d2 - a2 * d3) / ab - y1,
      yb = (a2 * c3 - a3 * c2) / ab,
      A = xb * xb + yb * yb - 1,
      B = 2 * (xa * xb + ya * yb + r1),
      C = xa * xa + ya * ya - r1 * r1,
      r = (-B - Math.sqrt(B * B - 4 * A * C)) / (2 * A);
  return {
    x: xa + xb * r + x1,
    y: ya + yb * r + y1,
    r: r
  };
}

function place(a, b, c) {
  var ax = a.x,
      ay = a.y,
      da = b.r + c.r,
      db = a.r + c.r,
      dx = b.x - ax,
      dy = b.y - ay,
      dc = dx * dx + dy * dy;
  if (dc) {
    var x = 0.5 + ((db *= db) - (da *= da)) / (2 * dc),
        y = Math.sqrt(Math.max(0, 2 * da * (db + dc) - (db -= dc) * db - da * da)) / (2 * dc);
    c.x = ax + x * dx + y * dy;
    c.y = ay + x * dy - y * dx;
  } else {
    c.x = ax + db;
    c.y = ay;
  }
}

function intersects(a, b) {
  var dx = b.x - a.x,
      dy = b.y - a.y,
      dr = a.r + b.r;
  return dr * dr > dx * dx + dy * dy;
}

function distance2(circle, x, y) {
  var dx = circle.x - x,
      dy = circle.y - y;
  return dx * dx + dy * dy;
}

function Node$1(circle) {
  this._ = circle;
  this.next = null;
  this.previous = null;
}

function packEnclose(circles) {
  if (!(n = circles.length)) return 0;

  var a, b, c, n;

  // Place the first circle.
  a = circles[0], a.x = 0, a.y = 0;
  if (!(n > 1)) return a.r;

  // Place the second circle.
  b = circles[1], a.x = -b.r, b.x = a.r, b.y = 0;
  if (!(n > 2)) return a.r + b.r;

  // Place the third circle.
  place(b, a, c = circles[2]);

  // Initialize the weighted centroid.
  var aa = a.r * a.r,
      ba = b.r * b.r,
      ca = c.r * c.r,
      oa = aa + ba + ca,
      ox = aa * a.x + ba * b.x + ca * c.x,
      oy = aa * a.y + ba * b.y + ca * c.y,
      cx,
      cy,
      i,
      j,
      k,
      sj,
      sk;

  // Initialize the front-chain using the first three circles a, b and c.
  a = new Node$1(a), b = new Node$1(b), c = new Node$1(c);
  a.next = c.previous = b;
  b.next = a.previous = c;
  c.next = b.previous = a;

  // Attempt to place each remaining circle…
  pack: for (i = 3; i < n; ++i) {
    place(a._, b._, c = circles[i]), c = new Node$1(c);

    // If there are only three elements in the front-chain…
    if ((k = a.previous) === (j = b.next)) {
      // If the new circle intersects the third circle,
      // rotate the front chain to try the next position.
      if (intersects(j._, c._)) {
        a = b, b = j, --i;
        continue pack;
      }
    }

    // Find the closest intersecting circle on the front-chain, if any.
    else {
        sj = j._.r, sk = k._.r;
        do {
          if (sj <= sk) {
            if (intersects(j._, c._)) {
              b = j, a.next = b, b.previous = a, --i;
              continue pack;
            }
            j = j.next, sj += j._.r;
          } else {
            if (intersects(k._, c._)) {
              a = k, a.next = b, b.previous = a, --i;
              continue pack;
            }
            k = k.previous, sk += k._.r;
          }
        } while (j !== k.next);
      }

    // Success! Insert the new circle c between a and b.
    c.previous = a, c.next = b, a.next = b.previous = b = c;

    // Update the weighted centroid.
    oa += ca = c._.r * c._.r;
    ox += ca * c._.x;
    oy += ca * c._.y;

    // Compute the new closest circle a to centroid.
    aa = distance2(a._, cx = ox / oa, cy = oy / oa);
    while ((c = c.next) !== b) {
      if ((ca = distance2(c._, cx, cy)) < aa) {
        a = c, aa = ca;
      }
    }
    b = a.next;
  }

  // Compute the enclosing circle of the front chain.
  a = [b._], c = b;while ((c = c.next) !== b) {
    a.push(c._);
  }c = enclose(a);

  // Translate the circles to put the enclosing circle around the origin.
  for (i = 0; i < n; ++i) {
    a = circles[i], a.x -= c.x, a.y -= c.y;
  }return c.r;
}

var siblings = function (circles) {
  packEnclose(circles);
  return circles;
};

function optional(f) {
  return f == null ? null : required(f);
}

function required(f) {
  if (typeof f !== "function") throw new Error();
  return f;
}

function constantZero() {
  return 0;
}

var constant$6 = function (x) {
  return function () {
    return x;
  };
};

function defaultRadius(d) {
  return Math.sqrt(d.value);
}

var index = function () {
  var radius = null,
      dx = 1,
      dy = 1,
      padding = constantZero;

  function pack(root) {
    root.x = dx / 2, root.y = dy / 2;
    if (radius) {
      root.eachBefore(radiusLeaf(radius)).eachAfter(packChildren(padding, 0.5)).eachBefore(translateChild(1));
    } else {
      root.eachBefore(radiusLeaf(defaultRadius)).eachAfter(packChildren(constantZero, 1)).eachAfter(packChildren(padding, root.r / Math.min(dx, dy))).eachBefore(translateChild(Math.min(dx, dy) / (2 * root.r)));
    }
    return root;
  }

  pack.radius = function (x) {
    return arguments.length ? (radius = optional(x), pack) : radius;
  };

  pack.size = function (x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], pack) : [dx, dy];
  };

  pack.padding = function (x) {
    return arguments.length ? (padding = typeof x === "function" ? x : constant$6(+x), pack) : padding;
  };

  return pack;
};

function radiusLeaf(radius) {
  return function (node) {
    if (!node.children) {
      node.r = Math.max(0, +radius(node) || 0);
    }
  };
}

function packChildren(padding, k) {
  return function (node) {
    if (children = node.children) {
      var children,
          i,
          n = children.length,
          r = padding(node) * k || 0,
          e;

      if (r) for (i = 0; i < n; ++i) {
        children[i].r += r;
      }e = packEnclose(children);
      if (r) for (i = 0; i < n; ++i) {
        children[i].r -= r;
      }node.r = e + r;
    }
  };
}

function translateChild(k) {
  return function (node) {
    var parent = node.parent;
    node.r *= k;
    if (parent) {
      node.x = parent.x + k * node.x;
      node.y = parent.y + k * node.y;
    }
  };
}

var roundNode = function (node) {
  node.x0 = Math.round(node.x0);
  node.y0 = Math.round(node.y0);
  node.x1 = Math.round(node.x1);
  node.y1 = Math.round(node.y1);
};

var treemapDice = function (parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      node,
      i = -1,
      n = nodes.length,
      k = parent.value && (x1 - x0) / parent.value;

  while (++i < n) {
    node = nodes[i], node.y0 = y0, node.y1 = y1;
    node.x0 = x0, node.x1 = x0 += node.value * k;
  }
};

var partition = function () {
  var dx = 1,
      dy = 1,
      padding = 0,
      round = false;

  function partition(root) {
    var n = root.height + 1;
    root.x0 = root.y0 = padding;
    root.x1 = dx;
    root.y1 = dy / n;
    root.eachBefore(positionNode(dy, n));
    if (round) root.eachBefore(roundNode);
    return root;
  }

  function positionNode(dy, n) {
    return function (node) {
      if (node.children) {
        treemapDice(node, node.x0, dy * (node.depth + 1) / n, node.x1, dy * (node.depth + 2) / n);
      }
      var x0 = node.x0,
          y0 = node.y0,
          x1 = node.x1 - padding,
          y1 = node.y1 - padding;
      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
      node.x0 = x0;
      node.y0 = y0;
      node.x1 = x1;
      node.y1 = y1;
    };
  }

  partition.round = function (x) {
    return arguments.length ? (round = !!x, partition) : round;
  };

  partition.size = function (x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], partition) : [dx, dy];
  };

  partition.padding = function (x) {
    return arguments.length ? (padding = +x, partition) : padding;
  };

  return partition;
};

var keyPrefix$1 = "$";
var preroot = { depth: -1 };
var ambiguous = {};

function defaultId(d) {
  return d.id;
}

function defaultParentId(d) {
  return d.parentId;
}

var stratify = function () {
  var id = defaultId,
      parentId = defaultParentId;

  function stratify(data) {
    var d,
        i,
        n = data.length,
        root,
        parent,
        node,
        nodes = new Array(n),
        nodeId,
        nodeKey,
        nodeByKey = {};

    for (i = 0; i < n; ++i) {
      d = data[i], node = nodes[i] = new Node(d);
      if ((nodeId = id(d, i, data)) != null && (nodeId += "")) {
        nodeKey = keyPrefix$1 + (node.id = nodeId);
        nodeByKey[nodeKey] = nodeKey in nodeByKey ? ambiguous : node;
      }
    }

    for (i = 0; i < n; ++i) {
      node = nodes[i], nodeId = parentId(data[i], i, data);
      if (nodeId == null || !(nodeId += "")) {
        if (root) throw new Error("multiple roots");
        root = node;
      } else {
        parent = nodeByKey[keyPrefix$1 + nodeId];
        if (!parent) throw new Error("missing: " + nodeId);
        if (parent === ambiguous) throw new Error("ambiguous: " + nodeId);
        if (parent.children) parent.children.push(node);else parent.children = [node];
        node.parent = parent;
      }
    }

    if (!root) throw new Error("no root");
    root.parent = preroot;
    root.eachBefore(function (node) {
      node.depth = node.parent.depth + 1;--n;
    }).eachBefore(computeHeight);
    root.parent = null;
    if (n > 0) throw new Error("cycle");

    return root;
  }

  stratify.id = function (x) {
    return arguments.length ? (id = required(x), stratify) : id;
  };

  stratify.parentId = function (x) {
    return arguments.length ? (parentId = required(x), stratify) : parentId;
  };

  return stratify;
};

function defaultSeparation$1(a, b) {
  return a.parent === b.parent ? 1 : 2;
}

// function radialSeparation(a, b) {
//   return (a.parent === b.parent ? 1 : 2) / a.depth;
// }

// This function is used to traverse the left contour of a subtree (or
// subforest). It returns the successor of v on this contour. This successor is
// either given by the leftmost child of v or by the thread of v. The function
// returns null if and only if v is on the highest level of its subtree.
function nextLeft(v) {
  var children = v.children;
  return children ? children[0] : v.t;
}

// This function works analogously to nextLeft.
function nextRight(v) {
  var children = v.children;
  return children ? children[children.length - 1] : v.t;
}

// Shifts the current subtree rooted at w+. This is done by increasing
// prelim(w+) and mod(w+) by shift.
function moveSubtree(wm, wp, shift) {
  var change = shift / (wp.i - wm.i);
  wp.c -= change;
  wp.s += shift;
  wm.c += change;
  wp.z += shift;
  wp.m += shift;
}

// All other shifts, applied to the smaller subtrees between w- and w+, are
// performed by this function. To prepare the shifts, we have to adjust
// change(w+), shift(w+), and change(w-).
function executeShifts(v) {
  var shift = 0,
      change = 0,
      children = v.children,
      i = children.length,
      w;
  while (--i >= 0) {
    w = children[i];
    w.z += shift;
    w.m += shift;
    shift += w.s + (change += w.c);
  }
}

// If vi-’s ancestor is a sibling of v, returns vi-’s ancestor. Otherwise,
// returns the specified (default) ancestor.
function nextAncestor(vim, v, ancestor) {
  return vim.a.parent === v.parent ? vim.a : ancestor;
}

function TreeNode(node, i) {
  this._ = node;
  this.parent = null;
  this.children = null;
  this.A = null; // default ancestor
  this.a = this; // ancestor
  this.z = 0; // prelim
  this.m = 0; // mod
  this.c = 0; // change
  this.s = 0; // shift
  this.t = null; // thread
  this.i = i; // number
}

TreeNode.prototype = Object.create(Node.prototype);

function treeRoot(root) {
  var tree = new TreeNode(root, 0),
      node,
      nodes = [tree],
      child,
      children,
      i,
      n;

  while (node = nodes.pop()) {
    if (children = node._.children) {
      node.children = new Array(n = children.length);
      for (i = n - 1; i >= 0; --i) {
        nodes.push(child = node.children[i] = new TreeNode(children[i], i));
        child.parent = node;
      }
    }
  }

  (tree.parent = new TreeNode(null, 0)).children = [tree];
  return tree;
}

// Node-link tree diagram using the Reingold-Tilford "tidy" algorithm
var tree = function () {
  var separation = defaultSeparation$1,
      dx = 1,
      dy = 1,
      nodeSize = null;

  function tree(root) {
    var t = treeRoot(root);

    // Compute the layout using Buchheim et al.’s algorithm.
    t.eachAfter(firstWalk), t.parent.m = -t.z;
    t.eachBefore(secondWalk);

    // If a fixed node size is specified, scale x and y.
    if (nodeSize) root.eachBefore(sizeNode);

    // If a fixed tree size is specified, scale x and y based on the extent.
    // Compute the left-most, right-most, and depth-most nodes for extents.
    else {
        var left = root,
            right = root,
            bottom = root;
        root.eachBefore(function (node) {
          if (node.x < left.x) left = node;
          if (node.x > right.x) right = node;
          if (node.depth > bottom.depth) bottom = node;
        });
        var s = left === right ? 1 : separation(left, right) / 2,
            tx = s - left.x,
            kx = dx / (right.x + s + tx),
            ky = dy / (bottom.depth || 1);
        root.eachBefore(function (node) {
          node.x = (node.x + tx) * kx;
          node.y = node.depth * ky;
        });
      }

    return root;
  }

  // Computes a preliminary x-coordinate for v. Before that, FIRST WALK is
  // applied recursively to the children of v, as well as the function
  // APPORTION. After spacing out the children by calling EXECUTE SHIFTS, the
  // node v is placed to the midpoint of its outermost children.
  function firstWalk(v) {
    var children = v.children,
        siblings = v.parent.children,
        w = v.i ? siblings[v.i - 1] : null;
    if (children) {
      executeShifts(v);
      var midpoint = (children[0].z + children[children.length - 1].z) / 2;
      if (w) {
        v.z = w.z + separation(v._, w._);
        v.m = v.z - midpoint;
      } else {
        v.z = midpoint;
      }
    } else if (w) {
      v.z = w.z + separation(v._, w._);
    }
    v.parent.A = apportion(v, w, v.parent.A || siblings[0]);
  }

  // Computes all real x-coordinates by summing up the modifiers recursively.
  function secondWalk(v) {
    v._.x = v.z + v.parent.m;
    v.m += v.parent.m;
  }

  // The core of the algorithm. Here, a new subtree is combined with the
  // previous subtrees. Threads are used to traverse the inside and outside
  // contours of the left and right subtree up to the highest common level. The
  // vertices used for the traversals are vi+, vi-, vo-, and vo+, where the
  // superscript o means outside and i means inside, the subscript - means left
  // subtree and + means right subtree. For summing up the modifiers along the
  // contour, we use respective variables si+, si-, so-, and so+. Whenever two
  // nodes of the inside contours conflict, we compute the left one of the
  // greatest uncommon ancestors using the function ANCESTOR and call MOVE
  // SUBTREE to shift the subtree and prepare the shifts of smaller subtrees.
  // Finally, we add a new thread (if necessary).
  function apportion(v, w, ancestor) {
    if (w) {
      var vip = v,
          vop = v,
          vim = w,
          vom = vip.parent.children[0],
          sip = vip.m,
          sop = vop.m,
          sim = vim.m,
          som = vom.m,
          shift;
      while (vim = nextRight(vim), vip = nextLeft(vip), vim && vip) {
        vom = nextLeft(vom);
        vop = nextRight(vop);
        vop.a = v;
        shift = vim.z + sim - vip.z - sip + separation(vim._, vip._);
        if (shift > 0) {
          moveSubtree(nextAncestor(vim, v, ancestor), v, shift);
          sip += shift;
          sop += shift;
        }
        sim += vim.m;
        sip += vip.m;
        som += vom.m;
        sop += vop.m;
      }
      if (vim && !nextRight(vop)) {
        vop.t = vim;
        vop.m += sim - sop;
      }
      if (vip && !nextLeft(vom)) {
        vom.t = vip;
        vom.m += sip - som;
        ancestor = v;
      }
    }
    return ancestor;
  }

  function sizeNode(node) {
    node.x *= dx;
    node.y = node.depth * dy;
  }

  tree.separation = function (x) {
    return arguments.length ? (separation = x, tree) : separation;
  };

  tree.size = function (x) {
    return arguments.length ? (nodeSize = false, dx = +x[0], dy = +x[1], tree) : nodeSize ? null : [dx, dy];
  };

  tree.nodeSize = function (x) {
    return arguments.length ? (nodeSize = true, dx = +x[0], dy = +x[1], tree) : nodeSize ? [dx, dy] : null;
  };

  return tree;
};

var treemapSlice = function (parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      node,
      i = -1,
      n = nodes.length,
      k = parent.value && (y1 - y0) / parent.value;

  while (++i < n) {
    node = nodes[i], node.x0 = x0, node.x1 = x1;
    node.y0 = y0, node.y1 = y0 += node.value * k;
  }
};

var phi = (1 + Math.sqrt(5)) / 2;

function squarifyRatio(ratio, parent, x0, y0, x1, y1) {
  var rows = [],
      nodes = parent.children,
      row,
      nodeValue,
      i0 = 0,
      i1 = 0,
      n = nodes.length,
      dx,
      dy,
      value = parent.value,
      sumValue,
      minValue,
      maxValue,
      newRatio,
      minRatio,
      alpha,
      beta;

  while (i0 < n) {
    dx = x1 - x0, dy = y1 - y0;

    // Find the next non-empty node.
    do {
      sumValue = nodes[i1++].value;
    } while (!sumValue && i1 < n);
    minValue = maxValue = sumValue;
    alpha = Math.max(dy / dx, dx / dy) / (value * ratio);
    beta = sumValue * sumValue * alpha;
    minRatio = Math.max(maxValue / beta, beta / minValue);

    // Keep adding nodes while the aspect ratio maintains or improves.
    for (; i1 < n; ++i1) {
      sumValue += nodeValue = nodes[i1].value;
      if (nodeValue < minValue) minValue = nodeValue;
      if (nodeValue > maxValue) maxValue = nodeValue;
      beta = sumValue * sumValue * alpha;
      newRatio = Math.max(maxValue / beta, beta / minValue);
      if (newRatio > minRatio) {
        sumValue -= nodeValue;break;
      }
      minRatio = newRatio;
    }

    // Position and record the row orientation.
    rows.push(row = { value: sumValue, dice: dx < dy, children: nodes.slice(i0, i1) });
    if (row.dice) treemapDice(row, x0, y0, x1, value ? y0 += dy * sumValue / value : y1);else treemapSlice(row, x0, y0, value ? x0 += dx * sumValue / value : x1, y1);
    value -= sumValue, i0 = i1;
  }

  return rows;
}

var squarify = (function custom(ratio) {

  function squarify(parent, x0, y0, x1, y1) {
    squarifyRatio(ratio, parent, x0, y0, x1, y1);
  }

  squarify.ratio = function (x) {
    return custom((x = +x) > 1 ? x : 1);
  };

  return squarify;
})(phi);

var index$1 = function () {
  var tile = squarify,
      round = false,
      dx = 1,
      dy = 1,
      paddingStack = [0],
      paddingInner = constantZero,
      paddingTop = constantZero,
      paddingRight = constantZero,
      paddingBottom = constantZero,
      paddingLeft = constantZero;

  function treemap(root) {
    root.x0 = root.y0 = 0;
    root.x1 = dx;
    root.y1 = dy;
    root.eachBefore(positionNode);
    paddingStack = [0];
    if (round) root.eachBefore(roundNode);
    return root;
  }

  function positionNode(node) {
    var p = paddingStack[node.depth],
        x0 = node.x0 + p,
        y0 = node.y0 + p,
        x1 = node.x1 - p,
        y1 = node.y1 - p;
    if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
    if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
    node.x0 = x0;
    node.y0 = y0;
    node.x1 = x1;
    node.y1 = y1;
    if (node.children) {
      p = paddingStack[node.depth + 1] = paddingInner(node) / 2;
      x0 += paddingLeft(node) - p;
      y0 += paddingTop(node) - p;
      x1 -= paddingRight(node) - p;
      y1 -= paddingBottom(node) - p;
      if (x1 < x0) x0 = x1 = (x0 + x1) / 2;
      if (y1 < y0) y0 = y1 = (y0 + y1) / 2;
      tile(node, x0, y0, x1, y1);
    }
  }

  treemap.round = function (x) {
    return arguments.length ? (round = !!x, treemap) : round;
  };

  treemap.size = function (x) {
    return arguments.length ? (dx = +x[0], dy = +x[1], treemap) : [dx, dy];
  };

  treemap.tile = function (x) {
    return arguments.length ? (tile = required(x), treemap) : tile;
  };

  treemap.padding = function (x) {
    return arguments.length ? treemap.paddingInner(x).paddingOuter(x) : treemap.paddingInner();
  };

  treemap.paddingInner = function (x) {
    return arguments.length ? (paddingInner = typeof x === "function" ? x : constant$6(+x), treemap) : paddingInner;
  };

  treemap.paddingOuter = function (x) {
    return arguments.length ? treemap.paddingTop(x).paddingRight(x).paddingBottom(x).paddingLeft(x) : treemap.paddingTop();
  };

  treemap.paddingTop = function (x) {
    return arguments.length ? (paddingTop = typeof x === "function" ? x : constant$6(+x), treemap) : paddingTop;
  };

  treemap.paddingRight = function (x) {
    return arguments.length ? (paddingRight = typeof x === "function" ? x : constant$6(+x), treemap) : paddingRight;
  };

  treemap.paddingBottom = function (x) {
    return arguments.length ? (paddingBottom = typeof x === "function" ? x : constant$6(+x), treemap) : paddingBottom;
  };

  treemap.paddingLeft = function (x) {
    return arguments.length ? (paddingLeft = typeof x === "function" ? x : constant$6(+x), treemap) : paddingLeft;
  };

  return treemap;
};

var binary = function (parent, x0, y0, x1, y1) {
  var nodes = parent.children,
      i,
      n = nodes.length,
      sum,
      sums = new Array(n + 1);

  for (sums[0] = sum = i = 0; i < n; ++i) {
    sums[i + 1] = sum += nodes[i].value;
  }

  partition(0, n, parent.value, x0, y0, x1, y1);

  function partition(i, j, value, x0, y0, x1, y1) {
    if (i >= j - 1) {
      var node = nodes[i];
      node.x0 = x0, node.y0 = y0;
      node.x1 = x1, node.y1 = y1;
      return;
    }

    var valueOffset = sums[i],
        valueTarget = value / 2 + valueOffset,
        k = i + 1,
        hi = j - 1;

    while (k < hi) {
      var mid = k + hi >>> 1;
      if (sums[mid] < valueTarget) k = mid + 1;else hi = mid;
    }

    var valueLeft = sums[k] - valueOffset,
        valueRight = value - valueLeft;

    if (y1 - y0 > x1 - x0) {
      var yk = (y0 * valueRight + y1 * valueLeft) / value;
      partition(i, k, valueLeft, x0, y0, x1, yk);
      partition(k, j, valueRight, x0, yk, x1, y1);
    } else {
      var xk = (x0 * valueRight + x1 * valueLeft) / value;
      partition(i, k, valueLeft, x0, y0, xk, y1);
      partition(k, j, valueRight, xk, y0, x1, y1);
    }
  }
};

var sliceDice = function (parent, x0, y0, x1, y1) {
  (parent.depth & 1 ? treemapSlice : treemapDice)(parent, x0, y0, x1, y1);
};

var resquarify = (function custom(ratio) {

  function resquarify(parent, x0, y0, x1, y1) {
    if ((rows = parent._squarify) && rows.ratio === ratio) {
      var rows,
          row,
          nodes,
          i,
          j = -1,
          n,
          m = rows.length,
          value = parent.value;

      while (++j < m) {
        row = rows[j], nodes = row.children;
        for (i = row.value = 0, n = nodes.length; i < n; ++i) {
          row.value += nodes[i].value;
        }if (row.dice) treemapDice(row, x0, y0, x1, y0 += (y1 - y0) * row.value / value);else treemapSlice(row, x0, y0, x0 += (x1 - x0) * row.value / value, y1);
        value -= row.value;
      }
    } else {
      parent._squarify = rows = squarifyRatio(ratio, parent, x0, y0, x1, y1);
      rows.ratio = ratio;
    }
  }

  resquarify.ratio = function (x) {
    return custom((x = +x) > 1 ? x : 1);
  };

  return resquarify;
})(phi);

function nopropagation() {
  exports.event.stopImmediatePropagation();
}

var noevent = function () {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

var dragDisable = function (view) {
  var root = view.document.documentElement,
      selection$$1 = select(view).on("dragstart.drag", noevent, true);
  if ("onselectstart" in root) {
    selection$$1.on("selectstart.drag", noevent, true);
  } else {
    root.__noselect = root.style.MozUserSelect;
    root.style.MozUserSelect = "none";
  }
};

function yesdrag(view, noclick) {
  var root = view.document.documentElement,
      selection$$1 = select(view).on("dragstart.drag", null);
  if (noclick) {
    selection$$1.on("click.drag", noevent, true);
    setTimeout(function () {
      selection$$1.on("click.drag", null);
    }, 0);
  }
  if ("onselectstart" in root) {
    selection$$1.on("selectstart.drag", null);
  } else {
    root.style.MozUserSelect = root.__noselect;
    delete root.__noselect;
  }
}

var constant$7 = function (x) {
  return function () {
    return x;
  };
};

function DragEvent(target, type, subject, id, active, x, y, dx, dy, dispatch) {
  this.target = target;
  this.type = type;
  this.subject = subject;
  this.identifier = id;
  this.active = active;
  this.x = x;
  this.y = y;
  this.dx = dx;
  this.dy = dy;
  this._ = dispatch;
}

DragEvent.prototype.on = function () {
  var value = this._.on.apply(this._, arguments);
  return value === this._ ? this : value;
};

// Ignore right-click, since that should open the context menu.
function defaultFilter() {
  return !exports.event.button;
}

function defaultContainer() {
  return this.parentNode;
}

function defaultSubject(d) {
  return d == null ? { x: exports.event.x, y: exports.event.y } : d;
}

var drag = function () {
  var filter = defaultFilter,
      container = defaultContainer,
      subject = defaultSubject,
      gestures = {},
      listeners = dispatch("start", "drag", "end"),
      active = 0,
      mousemoving,
      touchending;

  function drag(selection$$1) {
    selection$$1.on("mousedown.drag", mousedowned).on("touchstart.drag", touchstarted).on("touchmove.drag", touchmoved).on("touchend.drag touchcancel.drag", touchended).style("-webkit-tap-highlight-color", "rgba(0,0,0,0)");
  }

  function mousedowned() {
    if (touchending || !filter.apply(this, arguments)) return;
    var gesture = beforestart("mouse", container.apply(this, arguments), mouse, this, arguments);
    if (!gesture) return;
    select(exports.event.view).on("mousemove.drag", mousemoved, true).on("mouseup.drag", mouseupped, true);
    dragDisable(exports.event.view);
    nopropagation();
    mousemoving = false;
    gesture("start");
  }

  function mousemoved() {
    noevent();
    mousemoving = true;
    gestures.mouse("drag");
  }

  function mouseupped() {
    select(exports.event.view).on("mousemove.drag mouseup.drag", null);
    yesdrag(exports.event.view, mousemoving);
    noevent();
    gestures.mouse("end");
  }

  function touchstarted() {
    if (!filter.apply(this, arguments)) return;
    var touches$$1 = exports.event.changedTouches,
        c = container.apply(this, arguments),
        n = touches$$1.length,
        i,
        gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = beforestart(touches$$1[i].identifier, c, touch, this, arguments)) {
        nopropagation();
        gesture("start");
      }
    }
  }

  function touchmoved() {
    var touches$$1 = exports.event.changedTouches,
        n = touches$$1.length,
        i,
        gesture;

    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches$$1[i].identifier]) {
        noevent();
        gesture("drag");
      }
    }
  }

  function touchended() {
    var touches$$1 = exports.event.changedTouches,
        n = touches$$1.length,
        i,
        gesture;

    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function () {
      touchending = null;
    }, 500); // Ghost clicks are delayed!
    for (i = 0; i < n; ++i) {
      if (gesture = gestures[touches$$1[i].identifier]) {
        nopropagation();
        gesture("end");
      }
    }
  }

  function beforestart(id, container, point, that, args) {
    var p = point(container, id),
        s,
        dx,
        dy,
        sublisteners = listeners.copy();

    if (!customEvent(new DragEvent(drag, "beforestart", s, id, active, p[0], p[1], 0, 0, sublisteners), function () {
      if ((exports.event.subject = s = subject.apply(that, args)) == null) return false;
      dx = s.x - p[0] || 0;
      dy = s.y - p[1] || 0;
      return true;
    })) return;

    return function gesture(type) {
      var p0 = p,
          n;
      switch (type) {
        case "start":
          gestures[id] = gesture, n = active++;break;
        case "end":
          delete gestures[id], --active; // nobreak
        case "drag":
          p = point(container, id), n = active;break;
      }
      customEvent(new DragEvent(drag, type, s, id, n, p[0] + dx, p[1] + dy, p[0] - p0[0], p[1] - p0[1], sublisteners), sublisteners.apply, sublisteners, [type, that, args]);
    };
  }

  drag.filter = function (_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$7(!!_), drag) : filter;
  };

  drag.container = function (_) {
    return arguments.length ? (container = typeof _ === "function" ? _ : constant$7(_), drag) : container;
  };

  drag.subject = function (_) {
    return arguments.length ? (subject = typeof _ === "function" ? _ : constant$7(_), drag) : subject;
  };

  drag.on = function () {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? drag : value;
  };

  return drag;
};

var constant$8 = function (x) {
  return function () {
    return x;
  };
};

function x$2(d) {
  return d[0];
}

function y$1(d) {
  return d[1];
}

function RedBlackTree() {
  this._ = null; // root node
}

function RedBlackNode(node) {
  node.U = // parent node
  node.C = // color - true for red, false for black
  node.L = // left node
  node.R = // right node
  node.P = // previous node
  node.N = null; // next node
}

RedBlackTree.prototype = {
  constructor: RedBlackTree,

  insert: function insert(after, node) {
    var parent, grandpa, uncle;

    if (after) {
      node.P = after;
      node.N = after.N;
      if (after.N) after.N.P = node;
      after.N = node;
      if (after.R) {
        after = after.R;
        while (after.L) {
          after = after.L;
        }after.L = node;
      } else {
        after.R = node;
      }
      parent = after;
    } else if (this._) {
      after = RedBlackFirst(this._);
      node.P = null;
      node.N = after;
      after.P = after.L = node;
      parent = after;
    } else {
      node.P = node.N = null;
      this._ = node;
      parent = null;
    }
    node.L = node.R = null;
    node.U = parent;
    node.C = true;

    after = node;
    while (parent && parent.C) {
      grandpa = parent.U;
      if (parent === grandpa.L) {
        uncle = grandpa.R;
        if (uncle && uncle.C) {
          parent.C = uncle.C = false;
          grandpa.C = true;
          after = grandpa;
        } else {
          if (after === parent.R) {
            RedBlackRotateLeft(this, parent);
            after = parent;
            parent = after.U;
          }
          parent.C = false;
          grandpa.C = true;
          RedBlackRotateRight(this, grandpa);
        }
      } else {
        uncle = grandpa.L;
        if (uncle && uncle.C) {
          parent.C = uncle.C = false;
          grandpa.C = true;
          after = grandpa;
        } else {
          if (after === parent.L) {
            RedBlackRotateRight(this, parent);
            after = parent;
            parent = after.U;
          }
          parent.C = false;
          grandpa.C = true;
          RedBlackRotateLeft(this, grandpa);
        }
      }
      parent = after.U;
    }
    this._.C = false;
  },

  remove: function remove(node) {
    if (node.N) node.N.P = node.P;
    if (node.P) node.P.N = node.N;
    node.N = node.P = null;

    var parent = node.U,
        sibling,
        left = node.L,
        right = node.R,
        next,
        red;

    if (!left) next = right;else if (!right) next = left;else next = RedBlackFirst(right);

    if (parent) {
      if (parent.L === node) parent.L = next;else parent.R = next;
    } else {
      this._ = next;
    }

    if (left && right) {
      red = next.C;
      next.C = node.C;
      next.L = left;
      left.U = next;
      if (next !== right) {
        parent = next.U;
        next.U = node.U;
        node = next.R;
        parent.L = node;
        next.R = right;
        right.U = next;
      } else {
        next.U = parent;
        parent = next;
        node = next.R;
      }
    } else {
      red = node.C;
      node = next;
    }

    if (node) node.U = parent;
    if (red) return;
    if (node && node.C) {
      node.C = false;return;
    }

    do {
      if (node === this._) break;
      if (node === parent.L) {
        sibling = parent.R;
        if (sibling.C) {
          sibling.C = false;
          parent.C = true;
          RedBlackRotateLeft(this, parent);
          sibling = parent.R;
        }
        if (sibling.L && sibling.L.C || sibling.R && sibling.R.C) {
          if (!sibling.R || !sibling.R.C) {
            sibling.L.C = false;
            sibling.C = true;
            RedBlackRotateRight(this, sibling);
            sibling = parent.R;
          }
          sibling.C = parent.C;
          parent.C = sibling.R.C = false;
          RedBlackRotateLeft(this, parent);
          node = this._;
          break;
        }
      } else {
        sibling = parent.L;
        if (sibling.C) {
          sibling.C = false;
          parent.C = true;
          RedBlackRotateRight(this, parent);
          sibling = parent.L;
        }
        if (sibling.L && sibling.L.C || sibling.R && sibling.R.C) {
          if (!sibling.L || !sibling.L.C) {
            sibling.R.C = false;
            sibling.C = true;
            RedBlackRotateLeft(this, sibling);
            sibling = parent.L;
          }
          sibling.C = parent.C;
          parent.C = sibling.L.C = false;
          RedBlackRotateRight(this, parent);
          node = this._;
          break;
        }
      }
      sibling.C = true;
      node = parent;
      parent = parent.U;
    } while (!node.C);

    if (node) node.C = false;
  }
};

function RedBlackRotateLeft(tree, node) {
  var p = node,
      q = node.R,
      parent = p.U;

  if (parent) {
    if (parent.L === p) parent.L = q;else parent.R = q;
  } else {
    tree._ = q;
  }

  q.U = parent;
  p.U = q;
  p.R = q.L;
  if (p.R) p.R.U = p;
  q.L = p;
}

function RedBlackRotateRight(tree, node) {
  var p = node,
      q = node.L,
      parent = p.U;

  if (parent) {
    if (parent.L === p) parent.L = q;else parent.R = q;
  } else {
    tree._ = q;
  }

  q.U = parent;
  p.U = q;
  p.L = q.R;
  if (p.L) p.L.U = p;
  q.R = p;
}

function RedBlackFirst(node) {
  while (node.L) {
    node = node.L;
  }return node;
}

function createEdge(left, right, v0, v1) {
  var edge = [null, null],
      index = edges.push(edge) - 1;
  edge.left = left;
  edge.right = right;
  if (v0) setEdgeEnd(edge, left, right, v0);
  if (v1) setEdgeEnd(edge, right, left, v1);
  cells[left.index].halfedges.push(index);
  cells[right.index].halfedges.push(index);
  return edge;
}

function createBorderEdge(left, v0, v1) {
  var edge = [v0, v1];
  edge.left = left;
  return edge;
}

function setEdgeEnd(edge, left, right, vertex) {
  if (!edge[0] && !edge[1]) {
    edge[0] = vertex;
    edge.left = left;
    edge.right = right;
  } else if (edge.left === right) {
    edge[1] = vertex;
  } else {
    edge[0] = vertex;
  }
}

// Liang–Barsky line clipping.
function clipEdge(edge, x0, y0, x1, y1) {
  var a = edge[0],
      b = edge[1],
      ax = a[0],
      ay = a[1],
      bx = b[0],
      by = b[1],
      t0 = 0,
      t1 = 1,
      dx = bx - ax,
      dy = by - ay,
      r;

  r = x0 - ax;
  if (!dx && r > 0) return;
  r /= dx;
  if (dx < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dx > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = x1 - ax;
  if (!dx && r < 0) return;
  r /= dx;
  if (dx < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dx > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  r = y0 - ay;
  if (!dy && r > 0) return;
  r /= dy;
  if (dy < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dy > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = y1 - ay;
  if (!dy && r < 0) return;
  r /= dy;
  if (dy < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dy > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  if (!(t0 > 0) && !(t1 < 1)) return true; // TODO Better check?

  if (t0 > 0) edge[0] = [ax + t0 * dx, ay + t0 * dy];
  if (t1 < 1) edge[1] = [ax + t1 * dx, ay + t1 * dy];
  return true;
}

function connectEdge(edge, x0, y0, x1, y1) {
  var v1 = edge[1];
  if (v1) return true;

  var v0 = edge[0],
      left = edge.left,
      right = edge.right,
      lx = left[0],
      ly = left[1],
      rx = right[0],
      ry = right[1],
      fx = (lx + rx) / 2,
      fy = (ly + ry) / 2,
      fm,
      fb;

  if (ry === ly) {
    if (fx < x0 || fx >= x1) return;
    if (lx > rx) {
      if (!v0) v0 = [fx, y0];else if (v0[1] >= y1) return;
      v1 = [fx, y1];
    } else {
      if (!v0) v0 = [fx, y1];else if (v0[1] < y0) return;
      v1 = [fx, y0];
    }
  } else {
    fm = (lx - rx) / (ry - ly);
    fb = fy - fm * fx;
    if (fm < -1 || fm > 1) {
      if (lx > rx) {
        if (!v0) v0 = [(y0 - fb) / fm, y0];else if (v0[1] >= y1) return;
        v1 = [(y1 - fb) / fm, y1];
      } else {
        if (!v0) v0 = [(y1 - fb) / fm, y1];else if (v0[1] < y0) return;
        v1 = [(y0 - fb) / fm, y0];
      }
    } else {
      if (ly < ry) {
        if (!v0) v0 = [x0, fm * x0 + fb];else if (v0[0] >= x1) return;
        v1 = [x1, fm * x1 + fb];
      } else {
        if (!v0) v0 = [x1, fm * x1 + fb];else if (v0[0] < x0) return;
        v1 = [x0, fm * x0 + fb];
      }
    }
  }

  edge[0] = v0;
  edge[1] = v1;
  return true;
}

function clipEdges(x0, y0, x1, y1) {
  var i = edges.length,
      edge;

  while (i--) {
    if (!connectEdge(edge = edges[i], x0, y0, x1, y1) || !clipEdge(edge, x0, y0, x1, y1) || !(Math.abs(edge[0][0] - edge[1][0]) > epsilon$3 || Math.abs(edge[0][1] - edge[1][1]) > epsilon$3)) {
      delete edges[i];
    }
  }
}

function createCell(site) {
  return cells[site.index] = {
    site: site,
    halfedges: []
  };
}

function cellHalfedgeAngle(cell, edge) {
  var site = cell.site,
      va = edge.left,
      vb = edge.right;
  if (site === vb) vb = va, va = site;
  if (vb) return Math.atan2(vb[1] - va[1], vb[0] - va[0]);
  if (site === va) va = edge[1], vb = edge[0];else va = edge[0], vb = edge[1];
  return Math.atan2(va[0] - vb[0], vb[1] - va[1]);
}

function cellHalfedgeStart(cell, edge) {
  return edge[+(edge.left !== cell.site)];
}

function cellHalfedgeEnd(cell, edge) {
  return edge[+(edge.left === cell.site)];
}

function sortCellHalfedges() {
  for (var i = 0, n = cells.length, cell, halfedges, j, m; i < n; ++i) {
    if ((cell = cells[i]) && (m = (halfedges = cell.halfedges).length)) {
      var index = new Array(m),
          array = new Array(m);
      for (j = 0; j < m; ++j) {
        index[j] = j, array[j] = cellHalfedgeAngle(cell, edges[halfedges[j]]);
      }index.sort(function (i, j) {
        return array[j] - array[i];
      });
      for (j = 0; j < m; ++j) {
        array[j] = halfedges[index[j]];
      }for (j = 0; j < m; ++j) {
        halfedges[j] = array[j];
      }
    }
  }
}

function clipCells(x0, y0, x1, y1) {
  var nCells = cells.length,
      iCell,
      cell,
      site,
      iHalfedge,
      halfedges,
      nHalfedges,
      start,
      startX,
      startY,
      end,
      endX,
      endY,
      cover = true;

  for (iCell = 0; iCell < nCells; ++iCell) {
    if (cell = cells[iCell]) {
      site = cell.site;
      halfedges = cell.halfedges;
      iHalfedge = halfedges.length;

      // Remove any dangling clipped edges.
      while (iHalfedge--) {
        if (!edges[halfedges[iHalfedge]]) {
          halfedges.splice(iHalfedge, 1);
        }
      }

      // Insert any border edges as necessary.
      iHalfedge = 0, nHalfedges = halfedges.length;
      while (iHalfedge < nHalfedges) {
        end = cellHalfedgeEnd(cell, edges[halfedges[iHalfedge]]), endX = end[0], endY = end[1];
        start = cellHalfedgeStart(cell, edges[halfedges[++iHalfedge % nHalfedges]]), startX = start[0], startY = start[1];
        if (Math.abs(endX - startX) > epsilon$3 || Math.abs(endY - startY) > epsilon$3) {
          halfedges.splice(iHalfedge, 0, edges.push(createBorderEdge(site, end, Math.abs(endX - x0) < epsilon$3 && y1 - endY > epsilon$3 ? [x0, Math.abs(startX - x0) < epsilon$3 ? startY : y1] : Math.abs(endY - y1) < epsilon$3 && x1 - endX > epsilon$3 ? [Math.abs(startY - y1) < epsilon$3 ? startX : x1, y1] : Math.abs(endX - x1) < epsilon$3 && endY - y0 > epsilon$3 ? [x1, Math.abs(startX - x1) < epsilon$3 ? startY : y0] : Math.abs(endY - y0) < epsilon$3 && endX - x0 > epsilon$3 ? [Math.abs(startY - y0) < epsilon$3 ? startX : x0, y0] : null)) - 1);
          ++nHalfedges;
        }
      }

      if (nHalfedges) cover = false;
    }
  }

  // If there weren’t any edges, have the closest site cover the extent.
  // It doesn’t matter which corner of the extent we measure!
  if (cover) {
    var dx,
        dy,
        d2,
        dc = Infinity;

    for (iCell = 0, cover = null; iCell < nCells; ++iCell) {
      if (cell = cells[iCell]) {
        site = cell.site;
        dx = site[0] - x0;
        dy = site[1] - y0;
        d2 = dx * dx + dy * dy;
        if (d2 < dc) dc = d2, cover = cell;
      }
    }

    if (cover) {
      var v00 = [x0, y0],
          v01 = [x0, y1],
          v11 = [x1, y1],
          v10 = [x1, y0];
      cover.halfedges.push(edges.push(createBorderEdge(site = cover.site, v00, v01)) - 1, edges.push(createBorderEdge(site, v01, v11)) - 1, edges.push(createBorderEdge(site, v11, v10)) - 1, edges.push(createBorderEdge(site, v10, v00)) - 1);
    }
  }

  // Lastly delete any cells with no edges; these were entirely clipped.
  for (iCell = 0; iCell < nCells; ++iCell) {
    if (cell = cells[iCell]) {
      if (!cell.halfedges.length) {
        delete cells[iCell];
      }
    }
  }
}

var circlePool = [];

var firstCircle;

function Circle() {
  RedBlackNode(this);
  this.x = this.y = this.arc = this.site = this.cy = null;
}

function attachCircle(arc) {
  var lArc = arc.P,
      rArc = arc.N;

  if (!lArc || !rArc) return;

  var lSite = lArc.site,
      cSite = arc.site,
      rSite = rArc.site;

  if (lSite === rSite) return;

  var bx = cSite[0],
      by = cSite[1],
      ax = lSite[0] - bx,
      ay = lSite[1] - by,
      cx = rSite[0] - bx,
      cy = rSite[1] - by;

  var d = 2 * (ax * cy - ay * cx);
  if (d >= -epsilon2$1) return;

  var ha = ax * ax + ay * ay,
      hc = cx * cx + cy * cy,
      x = (cy * ha - ay * hc) / d,
      y = (ax * hc - cx * ha) / d;

  var circle = circlePool.pop() || new Circle();
  circle.arc = arc;
  circle.site = cSite;
  circle.x = x + bx;
  circle.y = (circle.cy = y + by) + Math.sqrt(x * x + y * y); // y bottom

  arc.circle = circle;

  var before = null,
      node = circles._;

  while (node) {
    if (circle.y < node.y || circle.y === node.y && circle.x <= node.x) {
      if (node.L) node = node.L;else {
        before = node.P;break;
      }
    } else {
      if (node.R) node = node.R;else {
        before = node;break;
      }
    }
  }

  circles.insert(before, circle);
  if (!before) firstCircle = circle;
}

function detachCircle(arc) {
  var circle = arc.circle;
  if (circle) {
    if (!circle.P) firstCircle = circle.N;
    circles.remove(circle);
    circlePool.push(circle);
    RedBlackNode(circle);
    arc.circle = null;
  }
}

var beachPool = [];

function Beach() {
  RedBlackNode(this);
  this.edge = this.site = this.circle = null;
}

function createBeach(site) {
  var beach = beachPool.pop() || new Beach();
  beach.site = site;
  return beach;
}

function detachBeach(beach) {
  detachCircle(beach);
  beaches.remove(beach);
  beachPool.push(beach);
  RedBlackNode(beach);
}

function removeBeach(beach) {
  var circle = beach.circle,
      x = circle.x,
      y = circle.cy,
      vertex = [x, y],
      previous = beach.P,
      next = beach.N,
      disappearing = [beach];

  detachBeach(beach);

  var lArc = previous;
  while (lArc.circle && Math.abs(x - lArc.circle.x) < epsilon$3 && Math.abs(y - lArc.circle.cy) < epsilon$3) {
    previous = lArc.P;
    disappearing.unshift(lArc);
    detachBeach(lArc);
    lArc = previous;
  }

  disappearing.unshift(lArc);
  detachCircle(lArc);

  var rArc = next;
  while (rArc.circle && Math.abs(x - rArc.circle.x) < epsilon$3 && Math.abs(y - rArc.circle.cy) < epsilon$3) {
    next = rArc.N;
    disappearing.push(rArc);
    detachBeach(rArc);
    rArc = next;
  }

  disappearing.push(rArc);
  detachCircle(rArc);

  var nArcs = disappearing.length,
      iArc;
  for (iArc = 1; iArc < nArcs; ++iArc) {
    rArc = disappearing[iArc];
    lArc = disappearing[iArc - 1];
    setEdgeEnd(rArc.edge, lArc.site, rArc.site, vertex);
  }

  lArc = disappearing[0];
  rArc = disappearing[nArcs - 1];
  rArc.edge = createEdge(lArc.site, rArc.site, null, vertex);

  attachCircle(lArc);
  attachCircle(rArc);
}

function addBeach(site) {
  var x = site[0],
      directrix = site[1],
      lArc,
      rArc,
      dxl,
      dxr,
      node = beaches._;

  while (node) {
    dxl = leftBreakPoint(node, directrix) - x;
    if (dxl > epsilon$3) node = node.L;else {
      dxr = x - rightBreakPoint(node, directrix);
      if (dxr > epsilon$3) {
        if (!node.R) {
          lArc = node;
          break;
        }
        node = node.R;
      } else {
        if (dxl > -epsilon$3) {
          lArc = node.P;
          rArc = node;
        } else if (dxr > -epsilon$3) {
          lArc = node;
          rArc = node.N;
        } else {
          lArc = rArc = node;
        }
        break;
      }
    }
  }

  createCell(site);
  var newArc = createBeach(site);
  beaches.insert(lArc, newArc);

  if (!lArc && !rArc) return;

  if (lArc === rArc) {
    detachCircle(lArc);
    rArc = createBeach(lArc.site);
    beaches.insert(newArc, rArc);
    newArc.edge = rArc.edge = createEdge(lArc.site, newArc.site);
    attachCircle(lArc);
    attachCircle(rArc);
    return;
  }

  if (!rArc) {
    // && lArc
    newArc.edge = createEdge(lArc.site, newArc.site);
    return;
  }

  // else lArc !== rArc
  detachCircle(lArc);
  detachCircle(rArc);

  var lSite = lArc.site,
      ax = lSite[0],
      ay = lSite[1],
      bx = site[0] - ax,
      by = site[1] - ay,
      rSite = rArc.site,
      cx = rSite[0] - ax,
      cy = rSite[1] - ay,
      d = 2 * (bx * cy - by * cx),
      hb = bx * bx + by * by,
      hc = cx * cx + cy * cy,
      vertex = [(cy * hb - by * hc) / d + ax, (bx * hc - cx * hb) / d + ay];

  setEdgeEnd(rArc.edge, lSite, rSite, vertex);
  newArc.edge = createEdge(lSite, site, null, vertex);
  rArc.edge = createEdge(site, rSite, null, vertex);
  attachCircle(lArc);
  attachCircle(rArc);
}

function leftBreakPoint(arc, directrix) {
  var site = arc.site,
      rfocx = site[0],
      rfocy = site[1],
      pby2 = rfocy - directrix;

  if (!pby2) return rfocx;

  var lArc = arc.P;
  if (!lArc) return -Infinity;

  site = lArc.site;
  var lfocx = site[0],
      lfocy = site[1],
      plby2 = lfocy - directrix;

  if (!plby2) return lfocx;

  var hl = lfocx - rfocx,
      aby2 = 1 / pby2 - 1 / plby2,
      b = hl / plby2;

  if (aby2) return (-b + Math.sqrt(b * b - 2 * aby2 * (hl * hl / (-2 * plby2) - lfocy + plby2 / 2 + rfocy - pby2 / 2))) / aby2 + rfocx;

  return (rfocx + lfocx) / 2;
}

function rightBreakPoint(arc, directrix) {
  var rArc = arc.N;
  if (rArc) return leftBreakPoint(rArc, directrix);
  var site = arc.site;
  return site[1] === directrix ? site[0] : Infinity;
}

var epsilon$3 = 1e-6;
var epsilon2$1 = 1e-12;
var beaches;
var cells;
var circles;
var edges;

function triangleArea(a, b, c) {
  return (a[0] - c[0]) * (b[1] - a[1]) - (a[0] - b[0]) * (c[1] - a[1]);
}

function lexicographic(a, b) {
  return b[1] - a[1] || b[0] - a[0];
}

function Diagram(sites, extent) {
  var site = sites.sort(lexicographic).pop(),
      x,
      y,
      circle;

  edges = [];
  cells = new Array(sites.length);
  beaches = new RedBlackTree();
  circles = new RedBlackTree();

  while (true) {
    circle = firstCircle;
    if (site && (!circle || site[1] < circle.y || site[1] === circle.y && site[0] < circle.x)) {
      if (site[0] !== x || site[1] !== y) {
        addBeach(site);
        x = site[0], y = site[1];
      }
      site = sites.pop();
    } else if (circle) {
      removeBeach(circle.arc);
    } else {
      break;
    }
  }

  sortCellHalfedges();

  if (extent) {
    var x0 = +extent[0][0],
        y0 = +extent[0][1],
        x1 = +extent[1][0],
        y1 = +extent[1][1];
    clipEdges(x0, y0, x1, y1);
    clipCells(x0, y0, x1, y1);
  }

  this.edges = edges;
  this.cells = cells;

  beaches = circles = edges = cells = null;
}

Diagram.prototype = {
  constructor: Diagram,

  polygons: function polygons() {
    var edges = this.edges;

    return this.cells.map(function (cell) {
      var polygon = cell.halfedges.map(function (i) {
        return cellHalfedgeStart(cell, edges[i]);
      });
      polygon.data = cell.site.data;
      return polygon;
    });
  },

  triangles: function triangles() {
    var triangles = [],
        edges = this.edges;

    this.cells.forEach(function (cell, i) {
      var site = cell.site,
          halfedges = cell.halfedges,
          j = -1,
          m = halfedges.length,
          s0,
          e1 = edges[halfedges[m - 1]],
          s1 = e1.left === site ? e1.right : e1.left;

      while (++j < m) {
        s0 = s1;
        e1 = edges[halfedges[j]];
        s1 = e1.left === site ? e1.right : e1.left;
        if (s0 && s1 && i < s0.index && i < s1.index && triangleArea(site, s0, s1) < 0) {
          triangles.push([site.data, s0.data, s1.data]);
        }
      }
    });

    return triangles;
  },

  links: function links() {
    return this.edges.filter(function (edge) {
      return edge.right;
    }).map(function (edge) {
      return {
        source: edge.left.data,
        target: edge.right.data
      };
    });
  },

  find: function find(x, y, radius) {
    var that = this,
        i0,
        i1 = that._found || 0,
        cell = that.cells[i1] || that.cells[i1 = 0],
        dx = x - cell.site[0],
        dy = y - cell.site[1],
        d2 = dx * dx + dy * dy;

    do {
      cell = that.cells[i0 = i1], i1 = null;
      cell.halfedges.forEach(function (e) {
        var edge = that.edges[e],
            v = edge.left;
        if ((v === cell.site || !v) && !(v = edge.right)) return;
        var vx = x - v[0],
            vy = y - v[1],
            v2 = vx * vx + vy * vy;
        if (v2 < d2) d2 = v2, i1 = v.index;
      });
    } while (i1 !== null);

    that._found = i0;

    return radius == null || d2 <= radius * radius ? cell.site : null;
  }
};

var voronoi = function () {
  var x$$1 = x$2,
      y$$1 = y$1,
      extent = null;

  function voronoi(data) {
    return new Diagram(data.map(function (d, i) {
      var s = [Math.round(x$$1(d, i, data) / epsilon$3) * epsilon$3, Math.round(y$$1(d, i, data) / epsilon$3) * epsilon$3];
      s.index = i;
      s.data = d;
      return s;
    }), extent);
  }

  voronoi.polygons = function (data) {
    return voronoi(data).polygons();
  };

  voronoi.links = function (data) {
    return voronoi(data).links();
  };

  voronoi.triangles = function (data) {
    return voronoi(data).triangles();
  };

  voronoi.x = function (_) {
    return arguments.length ? (x$$1 = typeof _ === "function" ? _ : constant$8(+_), voronoi) : x$$1;
  };

  voronoi.y = function (_) {
    return arguments.length ? (y$$1 = typeof _ === "function" ? _ : constant$8(+_), voronoi) : y$$1;
  };

  voronoi.extent = function (_) {
    return arguments.length ? (extent = _ == null ? null : [[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]], voronoi) : extent && [[extent[0][0], extent[0][1]], [extent[1][0], extent[1][1]]];
  };

  voronoi.size = function (_) {
    return arguments.length ? (extent = _ == null ? null : [[0, 0], [+_[0], +_[1]]], voronoi) : extent && [extent[1][0] - extent[0][0], extent[1][1] - extent[0][1]];
  };

  return voronoi;
};

var constant$9 = function (x) {
  return function () {
    return x;
  };
};

function ZoomEvent(target, type, transform) {
  this.target = target;
  this.type = type;
  this.transform = transform;
}

function Transform(k, x, y) {
  this.k = k;
  this.x = x;
  this.y = y;
}

Transform.prototype = {
  constructor: Transform,
  scale: function scale(k) {
    return k === 1 ? this : new Transform(this.k * k, this.x, this.y);
  },
  translate: function translate(x, y) {
    return x === 0 & y === 0 ? this : new Transform(this.k, this.x + this.k * x, this.y + this.k * y);
  },
  apply: function apply(point) {
    return [point[0] * this.k + this.x, point[1] * this.k + this.y];
  },
  applyX: function applyX(x) {
    return x * this.k + this.x;
  },
  applyY: function applyY(y) {
    return y * this.k + this.y;
  },
  invert: function invert(location) {
    return [(location[0] - this.x) / this.k, (location[1] - this.y) / this.k];
  },
  invertX: function invertX(x) {
    return (x - this.x) / this.k;
  },
  invertY: function invertY(y) {
    return (y - this.y) / this.k;
  },
  rescaleX: function rescaleX(x) {
    return x.copy().domain(x.range().map(this.invertX, this).map(x.invert, x));
  },
  rescaleY: function rescaleY(y) {
    return y.copy().domain(y.range().map(this.invertY, this).map(y.invert, y));
  },
  toString: function toString() {
    return "translate(" + this.x + "," + this.y + ") scale(" + this.k + ")";
  }
};

var identity$6 = new Transform(1, 0, 0);

transform.prototype = Transform.prototype;

function transform(node) {
  return node.__zoom || identity$6;
}

function nopropagation$1() {
  exports.event.stopImmediatePropagation();
}

var noevent$1 = function () {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

// Ignore right-click, since that should open the context menu.
function defaultFilter$1() {
  return !exports.event.button;
}

function defaultExtent() {
  var e = this,
      w,
      h;
  if (e instanceof SVGElement) {
    e = e.ownerSVGElement || e;
    w = e.width.baseVal.value;
    h = e.height.baseVal.value;
  } else {
    w = e.clientWidth;
    h = e.clientHeight;
  }
  return [[0, 0], [w, h]];
}

function defaultTransform() {
  return this.__zoom || identity$6;
}

var zoom = function () {
  var filter = defaultFilter$1,
      extent = defaultExtent,
      k0 = 0,
      k1 = Infinity,
      x0 = -k1,
      x1 = k1,
      y0 = x0,
      y1 = x1,
      duration = 250,
      interpolate$$1 = interpolateZoom,
      gestures = [],
      listeners = dispatch("start", "zoom", "end"),
      touchstarting,
      touchending,
      touchDelay = 500,
      wheelDelay = 150;

  function zoom(selection$$1) {
    selection$$1.on("wheel.zoom", wheeled).on("mousedown.zoom", mousedowned).on("dblclick.zoom", dblclicked).on("touchstart.zoom", touchstarted).on("touchmove.zoom", touchmoved).on("touchend.zoom touchcancel.zoom", touchended).style("-webkit-tap-highlight-color", "rgba(0,0,0,0)").property("__zoom", defaultTransform);
  }

  zoom.transform = function (collection, transform) {
    var selection$$1 = collection.selection ? collection.selection() : collection;
    selection$$1.property("__zoom", defaultTransform);
    if (collection !== selection$$1) {
      schedule(collection, transform);
    } else {
      selection$$1.interrupt().each(function () {
        gesture(this, arguments).start().zoom(null, typeof transform === "function" ? transform.apply(this, arguments) : transform).end();
      });
    }
  };

  zoom.scaleBy = function (selection$$1, k) {
    zoom.scaleTo(selection$$1, function () {
      var k0 = this.__zoom.k,
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return k0 * k1;
    });
  };

  zoom.scaleTo = function (selection$$1, k) {
    zoom.transform(selection$$1, function () {
      var e = extent.apply(this, arguments),
          t0 = this.__zoom,
          p0 = centroid(e),
          p1 = t0.invert(p0),
          k1 = typeof k === "function" ? k.apply(this, arguments) : k;
      return constrain(translate(scale(t0, k1), p0, p1), e);
    });
  };

  zoom.translateBy = function (selection$$1, x, y) {
    zoom.transform(selection$$1, function () {
      return constrain(this.__zoom.translate(typeof x === "function" ? x.apply(this, arguments) : x, typeof y === "function" ? y.apply(this, arguments) : y), extent.apply(this, arguments));
    });
  };

  function scale(transform, k) {
    k = Math.max(k0, Math.min(k1, k));
    return k === transform.k ? transform : new Transform(k, transform.x, transform.y);
  }

  function translate(transform, p0, p1) {
    var x = p0[0] - p1[0] * transform.k,
        y = p0[1] - p1[1] * transform.k;
    return x === transform.x && y === transform.y ? transform : new Transform(transform.k, x, y);
  }

  function constrain(transform, extent) {
    var dx0 = transform.invertX(extent[0][0]) - x0,
        dx1 = transform.invertX(extent[1][0]) - x1,
        dy0 = transform.invertY(extent[0][1]) - y0,
        dy1 = transform.invertY(extent[1][1]) - y1;
    return transform.translate(dx1 > dx0 ? (dx0 + dx1) / 2 : Math.min(0, dx0) || Math.max(0, dx1), dy1 > dy0 ? (dy0 + dy1) / 2 : Math.min(0, dy0) || Math.max(0, dy1));
  }

  function centroid(extent) {
    return [(+extent[0][0] + +extent[1][0]) / 2, (+extent[0][1] + +extent[1][1]) / 2];
  }

  function schedule(transition$$1, transform, center) {
    transition$$1.on("start.zoom", function () {
      gesture(this, arguments).start();
    }).on("interrupt.zoom end.zoom", function () {
      gesture(this, arguments).end();
    }).tween("zoom", function () {
      var that = this,
          args = arguments,
          g = gesture(that, args),
          e = extent.apply(that, args),
          p = center || centroid(e),
          w = Math.max(e[1][0] - e[0][0], e[1][1] - e[0][1]),
          a = that.__zoom,
          b = typeof transform === "function" ? transform.apply(that, args) : transform,
          i = interpolate$$1(a.invert(p).concat(w / a.k), b.invert(p).concat(w / b.k));
      return function (t) {
        if (t === 1) t = b; // Avoid rounding error on end.
        else {
            var l = i(t),
                k = w / l[2];t = new Transform(k, p[0] - l[0] * k, p[1] - l[1] * k);
          }
        g.zoom(null, t);
      };
    });
  }

  function gesture(that, args) {
    for (var i = 0, n = gestures.length, g; i < n; ++i) {
      if ((g = gestures[i]).that === that) {
        return g;
      }
    }
    return new Gesture(that, args);
  }

  function Gesture(that, args) {
    this.that = that;
    this.args = args;
    this.index = -1;
    this.active = 0;
    this.extent = extent.apply(that, args);
  }

  Gesture.prototype = {
    start: function start() {
      if (++this.active === 1) {
        this.index = gestures.push(this) - 1;
        this.emit("start");
      }
      return this;
    },
    zoom: function zoom(key, transform) {
      if (this.mouse && key !== "mouse") this.mouse[1] = transform.invert(this.mouse[0]);
      if (this.touch0 && key !== "touch") this.touch0[1] = transform.invert(this.touch0[0]);
      if (this.touch1 && key !== "touch") this.touch1[1] = transform.invert(this.touch1[0]);
      this.that.__zoom = transform;
      this.emit("zoom");
      return this;
    },
    end: function end() {
      if (--this.active === 0) {
        gestures.splice(this.index, 1);
        this.index = -1;
        this.emit("end");
      }
      return this;
    },
    emit: function emit(type) {
      customEvent(new ZoomEvent(zoom, type, this.that.__zoom), listeners.apply, listeners, [type, this.that, this.args]);
    }
  };

  function wheeled() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        t = this.__zoom,
        k = Math.max(k0, Math.min(k1, t.k * Math.pow(2, -exports.event.deltaY * (exports.event.deltaMode ? 120 : 1) / 500))),
        p = mouse(this);

    // If the mouse is in the same location as before, reuse it.
    // If there were recent wheel events, reset the wheel idle timeout.
    if (g.wheel) {
      if (g.mouse[0][0] !== p[0] || g.mouse[0][1] !== p[1]) {
        g.mouse[1] = t.invert(g.mouse[0] = p);
      }
      clearTimeout(g.wheel);
    }

    // If this wheel event won’t trigger a transform change, ignore it.
    else if (t.k === k) return;

      // Otherwise, capture the mouse point and location at the start.
      else {
          g.mouse = [p, t.invert(p)];
          interrupt(this);
          g.start();
        }

    noevent$1();
    g.wheel = setTimeout(wheelidled, wheelDelay);
    g.zoom("mouse", constrain(translate(scale(t, k), g.mouse[0], g.mouse[1]), g.extent));

    function wheelidled() {
      g.wheel = null;
      g.end();
    }
  }

  function mousedowned() {
    if (touchending || !filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        v = select(exports.event.view).on("mousemove.zoom", mousemoved, true).on("mouseup.zoom", mouseupped, true),
        p = mouse(this);

    dragDisable(exports.event.view);
    nopropagation$1();
    g.mouse = [p, this.__zoom.invert(p)];
    interrupt(this);
    g.start();

    function mousemoved() {
      noevent$1();
      g.moved = true;
      g.zoom("mouse", constrain(translate(g.that.__zoom, g.mouse[0] = mouse(g.that), g.mouse[1]), g.extent));
    }

    function mouseupped() {
      v.on("mousemove.zoom mouseup.zoom", null);
      yesdrag(exports.event.view, g.moved);
      noevent$1();
      g.end();
    }
  }

  function dblclicked() {
    if (!filter.apply(this, arguments)) return;
    var t0 = this.__zoom,
        p0 = mouse(this),
        p1 = t0.invert(p0),
        k1 = t0.k * (exports.event.shiftKey ? 0.5 : 2),
        t1 = constrain(translate(scale(t0, k1), p0, p1), extent.apply(this, arguments));

    noevent$1();
    if (duration > 0) select(this).transition().duration(duration).call(schedule, t1, p0);else select(this).call(zoom.transform, t1);
  }

  function touchstarted() {
    if (!filter.apply(this, arguments)) return;
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        n = touches$$1.length,
        i,
        t,
        p;

    nopropagation$1();
    for (i = 0; i < n; ++i) {
      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
      p = [p, this.__zoom.invert(p), t.identifier];
      if (!g.touch0) g.touch0 = p;else if (!g.touch1) g.touch1 = p;
    }

    // If this is a dbltap, reroute to the (optional) dblclick.zoom handler.
    if (touchstarting) {
      touchstarting = clearTimeout(touchstarting);
      if (!g.touch1) {
        g.end();
        p = select(this).on("dblclick.zoom");
        if (p) p.apply(this, arguments);
        return;
      }
    }

    if (exports.event.touches.length === n) {
      touchstarting = setTimeout(function () {
        touchstarting = null;
      }, touchDelay);
      interrupt(this);
      g.start();
    }
  }

  function touchmoved() {
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        n = touches$$1.length,
        i,
        t,
        p,
        l;

    noevent$1();
    if (touchstarting) touchstarting = clearTimeout(touchstarting);
    for (i = 0; i < n; ++i) {
      t = touches$$1[i], p = touch(this, touches$$1, t.identifier);
      if (g.touch0 && g.touch0[2] === t.identifier) g.touch0[0] = p;else if (g.touch1 && g.touch1[2] === t.identifier) g.touch1[0] = p;
    }
    t = g.that.__zoom;
    if (g.touch1) {
      var p0 = g.touch0[0],
          l0 = g.touch0[1],
          p1 = g.touch1[0],
          l1 = g.touch1[1],
          dp = (dp = p1[0] - p0[0]) * dp + (dp = p1[1] - p0[1]) * dp,
          dl = (dl = l1[0] - l0[0]) * dl + (dl = l1[1] - l0[1]) * dl;
      t = scale(t, Math.sqrt(dp / dl));
      p = [(p0[0] + p1[0]) / 2, (p0[1] + p1[1]) / 2];
      l = [(l0[0] + l1[0]) / 2, (l0[1] + l1[1]) / 2];
    } else if (g.touch0) p = g.touch0[0], l = g.touch0[1];else return;
    g.zoom("touch", constrain(translate(t, p, l), g.extent));
  }

  function touchended() {
    var g = gesture(this, arguments),
        touches$$1 = exports.event.changedTouches,
        n = touches$$1.length,
        i,
        t;

    nopropagation$1();
    if (touchending) clearTimeout(touchending);
    touchending = setTimeout(function () {
      touchending = null;
    }, touchDelay);
    for (i = 0; i < n; ++i) {
      t = touches$$1[i];
      if (g.touch0 && g.touch0[2] === t.identifier) delete g.touch0;else if (g.touch1 && g.touch1[2] === t.identifier) delete g.touch1;
    }
    if (g.touch1 && !g.touch0) g.touch0 = g.touch1, delete g.touch1;
    if (!g.touch0) g.end();
  }

  zoom.filter = function (_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$9(!!_), zoom) : filter;
  };

  zoom.extent = function (_) {
    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$9([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), zoom) : extent;
  };

  zoom.scaleExtent = function (_) {
    return arguments.length ? (k0 = +_[0], k1 = +_[1], zoom) : [k0, k1];
  };

  zoom.translateExtent = function (_) {
    return arguments.length ? (x0 = +_[0][0], x1 = +_[1][0], y0 = +_[0][1], y1 = +_[1][1], zoom) : [[x0, y0], [x1, y1]];
  };

  zoom.duration = function (_) {
    return arguments.length ? (duration = +_, zoom) : duration;
  };

  zoom.interpolate = function (_) {
    return arguments.length ? (interpolate$$1 = _, zoom) : interpolate$$1;
  };

  zoom.on = function () {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? zoom : value;
  };

  return zoom;
};

var constant$10 = function (x) {
  return function () {
    return x;
  };
};

var BrushEvent = function (target, type, selection) {
  this.target = target;
  this.type = type;
  this.selection = selection;
};

function nopropagation$2() {
  exports.event.stopImmediatePropagation();
}

var noevent$2 = function () {
  exports.event.preventDefault();
  exports.event.stopImmediatePropagation();
};

var MODE_DRAG = { name: "drag" };
var MODE_SPACE = { name: "space" };
var MODE_HANDLE = { name: "handle" };
var MODE_CENTER = { name: "center" };

var X$1 = {
  name: "x",
  handles: ["e", "w"].map(type),
  input: function input(x, e) {
    return x && [[x[0], e[0][1]], [x[1], e[1][1]]];
  },
  output: function output(xy) {
    return xy && [xy[0][0], xy[1][0]];
  }
};

var Y = {
  name: "y",
  handles: ["n", "s"].map(type),
  input: function input(y, e) {
    return y && [[e[0][0], y[0]], [e[1][0], y[1]]];
  },
  output: function output(xy) {
    return xy && [xy[0][1], xy[1][1]];
  }
};

var XY = {
  name: "xy",
  handles: ["n", "e", "s", "w", "nw", "ne", "se", "sw"].map(type),
  input: function input(xy) {
    return xy;
  },
  output: function output(xy) {
    return xy;
  }
};

var cursors = {
  overlay: "crosshair",
  selection: "move",
  n: "ns-resize",
  e: "ew-resize",
  s: "ns-resize",
  w: "ew-resize",
  nw: "nwse-resize",
  ne: "nesw-resize",
  se: "nwse-resize",
  sw: "nesw-resize"
};

var flipX = {
  e: "w",
  w: "e",
  nw: "ne",
  ne: "nw",
  se: "sw",
  sw: "se"
};

var flipY = {
  n: "s",
  s: "n",
  nw: "sw",
  ne: "se",
  se: "ne",
  sw: "nw"
};

var signsX = {
  overlay: +1,
  selection: +1,
  n: null,
  e: +1,
  s: null,
  w: -1,
  nw: -1,
  ne: +1,
  se: +1,
  sw: -1
};

var signsY = {
  overlay: +1,
  selection: +1,
  n: -1,
  e: null,
  s: +1,
  w: null,
  nw: -1,
  ne: -1,
  se: +1,
  sw: +1
};

function type(t) {
  return { type: t };
}

// Ignore right-click, since that should open the context menu.
function defaultFilter$2() {
  return !exports.event.button;
}

function defaultExtent$1() {
  var svg = this.ownerSVGElement || this;
  return [[0, 0], [svg.width.baseVal.value, svg.height.baseVal.value]];
}

// Like d3.local, but with the name “__brush” rather than auto-generated.
function local$1(node) {
  while (!node.__brush) {
    if (!(node = node.parentNode)) return;
  }return node.__brush;
}

function empty$2(extent) {
  return extent[0][0] === extent[1][0] || extent[0][1] === extent[1][1];
}

function brushSelection(node) {
  var state = node.__brush;
  return state ? state.dim.output(state.selection) : null;
}

function brushX() {
  return brush$1(X$1);
}

function brushY() {
  return brush$1(Y);
}

var brush = function () {
  return brush$1(XY);
};

function brush$1(dim) {
  var extent = defaultExtent$1,
      filter = defaultFilter$2,
      listeners = dispatch(brush, "start", "brush", "end"),
      handleSize = 6,
      touchending;

  function brush(group) {
    var overlay = group.property("__brush", initialize).selectAll(".overlay").data([type("overlay")]);

    overlay.enter().append("rect").attr("class", "overlay").attr("pointer-events", "all").attr("cursor", cursors.overlay).merge(overlay).each(function () {
      var extent = local$1(this).extent;
      select(this).attr("x", extent[0][0]).attr("y", extent[0][1]).attr("width", extent[1][0] - extent[0][0]).attr("height", extent[1][1] - extent[0][1]);
    });

    group.selectAll(".selection").data([type("selection")]).enter().append("rect").attr("class", "selection").attr("cursor", cursors.selection).attr("fill", "#777").attr("fill-opacity", 0.3).attr("stroke", "#fff").attr("shape-rendering", "crispEdges");

    var handle = group.selectAll(".handle").data(dim.handles, function (d) {
      return d.type;
    });

    handle.exit().remove();

    handle.enter().append("rect").attr("class", function (d) {
      return "handle handle--" + d.type;
    }).attr("cursor", function (d) {
      return cursors[d.type];
    });

    group.each(redraw).attr("fill", "none").attr("pointer-events", "all").style("-webkit-tap-highlight-color", "rgba(0,0,0,0)").on("mousedown.brush touchstart.brush", started);
  }

  brush.move = function (group, selection$$1) {
    if (group.selection) {
      group.on("start.brush", function () {
        emitter(this, arguments).beforestart().start();
      }).on("interrupt.brush end.brush", function () {
        emitter(this, arguments).end();
      }).tween("brush", function () {
        var that = this,
            state = that.__brush,
            emit = emitter(that, arguments),
            selection0 = state.selection,
            selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(this, arguments) : selection$$1, state.extent),
            i = interpolate(selection0, selection1);

        function tween(t) {
          state.selection = t === 1 && empty$2(selection1) ? null : i(t);
          redraw.call(that);
          emit.brush();
        }

        return selection0 && selection1 ? tween : tween(1);
      });
    } else {
      group.each(function () {
        var that = this,
            args = arguments,
            state = that.__brush,
            selection1 = dim.input(typeof selection$$1 === "function" ? selection$$1.apply(that, args) : selection$$1, state.extent),
            emit = emitter(that, args).beforestart();

        interrupt(that);
        state.selection = selection1 == null || empty$2(selection1) ? null : selection1;
        redraw.call(that);
        emit.start().brush().end();
      });
    }
  };

  function redraw() {
    var group = select(this),
        selection$$1 = local$1(this).selection;

    if (selection$$1) {
      group.selectAll(".selection").style("display", null).attr("x", selection$$1[0][0]).attr("y", selection$$1[0][1]).attr("width", selection$$1[1][0] - selection$$1[0][0]).attr("height", selection$$1[1][1] - selection$$1[0][1]);

      group.selectAll(".handle").style("display", null).attr("x", function (d) {
        return d.type[d.type.length - 1] === "e" ? selection$$1[1][0] - handleSize / 2 : selection$$1[0][0] - handleSize / 2;
      }).attr("y", function (d) {
        return d.type[0] === "s" ? selection$$1[1][1] - handleSize / 2 : selection$$1[0][1] - handleSize / 2;
      }).attr("width", function (d) {
        return d.type === "n" || d.type === "s" ? selection$$1[1][0] - selection$$1[0][0] + handleSize : handleSize;
      }).attr("height", function (d) {
        return d.type === "e" || d.type === "w" ? selection$$1[1][1] - selection$$1[0][1] + handleSize : handleSize;
      });
    } else {
      group.selectAll(".selection,.handle").style("display", "none").attr("x", null).attr("y", null).attr("width", null).attr("height", null);
    }
  }

  function emitter(that, args) {
    return that.__brush.emitter || new Emitter(that, args);
  }

  function Emitter(that, args) {
    this.that = that;
    this.args = args;
    this.state = that.__brush;
    this.active = 0;
  }

  Emitter.prototype = {
    beforestart: function beforestart() {
      if (++this.active === 1) this.state.emitter = this, this.starting = true;
      return this;
    },
    start: function start() {
      if (this.starting) this.starting = false, this.emit("start");
      return this;
    },
    brush: function brush() {
      this.emit("brush");
      return this;
    },
    end: function end() {
      if (--this.active === 0) delete this.state.emitter, this.emit("end");
      return this;
    },
    emit: function emit(type) {
      customEvent(new BrushEvent(brush, type, dim.output(this.state.selection)), listeners.apply, listeners, [type, this.that, this.args]);
    }
  };

  function started() {
    if (exports.event.touches) {
      if (exports.event.changedTouches.length < exports.event.touches.length) return noevent$2();
    } else if (touchending) return;
    if (!filter.apply(this, arguments)) return;

    var that = this,
        type = exports.event.target.__data__.type,
        mode = (exports.event.metaKey ? type = "overlay" : type) === "selection" ? MODE_DRAG : exports.event.altKey ? MODE_CENTER : MODE_HANDLE,
        signX = dim === Y ? null : signsX[type],
        signY = dim === X$1 ? null : signsY[type],
        state = local$1(that),
        extent = state.extent,
        selection$$1 = state.selection,
        W = extent[0][0],
        w0,
        w1,
        N = extent[0][1],
        n0,
        n1,
        E = extent[1][0],
        e0,
        e1,
        S = extent[1][1],
        s0,
        s1,
        dx,
        dy,
        moving,
        shifting = signX && signY && exports.event.shiftKey,
        lockX,
        lockY,
        point0 = mouse(that),
        point = point0,
        emit = emitter(that, arguments).beforestart();

    if (type === "overlay") {
      state.selection = selection$$1 = [[w0 = dim === Y ? W : point0[0], n0 = dim === X$1 ? N : point0[1]], [e0 = dim === Y ? E : w0, s0 = dim === X$1 ? S : n0]];
    } else {
      w0 = selection$$1[0][0];
      n0 = selection$$1[0][1];
      e0 = selection$$1[1][0];
      s0 = selection$$1[1][1];
    }

    w1 = w0;
    n1 = n0;
    e1 = e0;
    s1 = s0;

    var group = select(that).attr("pointer-events", "none");

    var overlay = group.selectAll(".overlay").attr("cursor", cursors[type]);

    if (exports.event.touches) {
      group.on("touchmove.brush", moved, true).on("touchend.brush touchcancel.brush", ended, true);
    } else {
      var view = select(exports.event.view).on("keydown.brush", keydowned, true).on("keyup.brush", keyupped, true).on("mousemove.brush", moved, true).on("mouseup.brush", ended, true);

      dragDisable(exports.event.view);
    }

    nopropagation$2();
    interrupt(that);
    redraw.call(that);
    emit.start();

    function moved() {
      var point1 = mouse(that);
      if (shifting && !lockX && !lockY) {
        if (Math.abs(point1[0] - point[0]) > Math.abs(point1[1] - point[1])) lockY = true;else lockX = true;
      }
      point = point1;
      moving = true;
      noevent$2();
      move();
    }

    function move() {
      var t;

      dx = point[0] - point0[0];
      dy = point[1] - point0[1];

      switch (mode) {
        case MODE_SPACE:
        case MODE_DRAG:
          {
            if (signX) dx = Math.max(W - w0, Math.min(E - e0, dx)), w1 = w0 + dx, e1 = e0 + dx;
            if (signY) dy = Math.max(N - n0, Math.min(S - s0, dy)), n1 = n0 + dy, s1 = s0 + dy;
            break;
          }
        case MODE_HANDLE:
          {
            if (signX < 0) dx = Math.max(W - w0, Math.min(E - w0, dx)), w1 = w0 + dx, e1 = e0;else if (signX > 0) dx = Math.max(W - e0, Math.min(E - e0, dx)), w1 = w0, e1 = e0 + dx;
            if (signY < 0) dy = Math.max(N - n0, Math.min(S - n0, dy)), n1 = n0 + dy, s1 = s0;else if (signY > 0) dy = Math.max(N - s0, Math.min(S - s0, dy)), n1 = n0, s1 = s0 + dy;
            break;
          }
        case MODE_CENTER:
          {
            if (signX) w1 = Math.max(W, Math.min(E, w0 - dx * signX)), e1 = Math.max(W, Math.min(E, e0 + dx * signX));
            if (signY) n1 = Math.max(N, Math.min(S, n0 - dy * signY)), s1 = Math.max(N, Math.min(S, s0 + dy * signY));
            break;
          }
      }

      if (e1 < w1) {
        signX *= -1;
        t = w0, w0 = e0, e0 = t;
        t = w1, w1 = e1, e1 = t;
        if (type in flipX) overlay.attr("cursor", cursors[type = flipX[type]]);
      }

      if (s1 < n1) {
        signY *= -1;
        t = n0, n0 = s0, s0 = t;
        t = n1, n1 = s1, s1 = t;
        if (type in flipY) overlay.attr("cursor", cursors[type = flipY[type]]);
      }

      if (state.selection) selection$$1 = state.selection; // May be set by brush.move!
      if (lockX) w1 = selection$$1[0][0], e1 = selection$$1[1][0];
      if (lockY) n1 = selection$$1[0][1], s1 = selection$$1[1][1];

      if (selection$$1[0][0] !== w1 || selection$$1[0][1] !== n1 || selection$$1[1][0] !== e1 || selection$$1[1][1] !== s1) {
        state.selection = [[w1, n1], [e1, s1]];
        redraw.call(that);
        emit.brush();
      }
    }

    function ended() {
      nopropagation$2();
      if (exports.event.touches) {
        if (exports.event.touches.length) return;
        if (touchending) clearTimeout(touchending);
        touchending = setTimeout(function () {
          touchending = null;
        }, 500); // Ghost clicks are delayed!
        group.on("touchmove.brush touchend.brush touchcancel.brush", null);
      } else {
        yesdrag(exports.event.view, moving);
        view.on("keydown.brush keyup.brush mousemove.brush mouseup.brush", null);
      }
      group.attr("pointer-events", "all");
      overlay.attr("cursor", cursors.overlay);
      if (state.selection) selection$$1 = state.selection; // May be set by brush.move (on start)!
      if (empty$2(selection$$1)) state.selection = null, redraw.call(that);
      emit.end();
    }

    function keydowned() {
      switch (exports.event.keyCode) {
        case 16:
          {
            // SHIFT
            shifting = signX && signY;
            break;
          }
        case 18:
          {
            // ALT
            if (mode === MODE_HANDLE) {
              if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
              if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
              mode = MODE_CENTER;
              move();
            }
            break;
          }
        case 32:
          {
            // SPACE; takes priority over ALT
            if (mode === MODE_HANDLE || mode === MODE_CENTER) {
              if (signX < 0) e0 = e1 - dx;else if (signX > 0) w0 = w1 - dx;
              if (signY < 0) s0 = s1 - dy;else if (signY > 0) n0 = n1 - dy;
              mode = MODE_SPACE;
              overlay.attr("cursor", cursors.selection);
              move();
            }
            break;
          }
        default:
          return;
      }
      noevent$2();
    }

    function keyupped() {
      switch (exports.event.keyCode) {
        case 16:
          {
            // SHIFT
            if (shifting) {
              lockX = lockY = shifting = false;
              move();
            }
            break;
          }
        case 18:
          {
            // ALT
            if (mode === MODE_CENTER) {
              if (signX < 0) e0 = e1;else if (signX > 0) w0 = w1;
              if (signY < 0) s0 = s1;else if (signY > 0) n0 = n1;
              mode = MODE_HANDLE;
              move();
            }
            break;
          }
        case 32:
          {
            // SPACE
            if (mode === MODE_SPACE) {
              if (exports.event.altKey) {
                if (signX) e0 = e1 - dx * signX, w0 = w1 + dx * signX;
                if (signY) s0 = s1 - dy * signY, n0 = n1 + dy * signY;
                mode = MODE_CENTER;
              } else {
                if (signX < 0) e0 = e1;else if (signX > 0) w0 = w1;
                if (signY < 0) s0 = s1;else if (signY > 0) n0 = n1;
                mode = MODE_HANDLE;
              }
              overlay.attr("cursor", cursors[type]);
              move();
            }
            break;
          }
        default:
          return;
      }
      noevent$2();
    }
  }

  function initialize() {
    var state = this.__brush || { selection: null };
    state.extent = extent.apply(this, arguments);
    state.dim = dim;
    return state;
  }

  brush.extent = function (_) {
    return arguments.length ? (extent = typeof _ === "function" ? _ : constant$10([[+_[0][0], +_[0][1]], [+_[1][0], +_[1][1]]]), brush) : extent;
  };

  brush.filter = function (_) {
    return arguments.length ? (filter = typeof _ === "function" ? _ : constant$10(!!_), brush) : filter;
  };

  brush.handleSize = function (_) {
    return arguments.length ? (handleSize = +_, brush) : handleSize;
  };

  brush.on = function () {
    var value = listeners.on.apply(listeners, arguments);
    return value === listeners ? brush : value;
  };

  return brush;
}

var cos = Math.cos;
var sin = Math.sin;
var pi$3 = Math.PI;
var halfPi$2 = pi$3 / 2;
var tau$3 = pi$3 * 2;
var max$1 = Math.max;

function compareValue(compare) {
  return function (a, b) {
    return compare(a.source.value + a.target.value, b.source.value + b.target.value);
  };
}

var chord = function () {
  var padAngle = 0,
      sortGroups = null,
      sortSubgroups = null,
      sortChords = null;

  function chord(matrix) {
    var n = matrix.length,
        groupSums = [],
        groupIndex = range(n),
        subgroupIndex = [],
        chords = [],
        groups = chords.groups = new Array(n),
        subgroups = new Array(n * n),
        k,
        x,
        x0,
        dx,
        i,
        j;

    // Compute the sum.
    k = 0, i = -1;while (++i < n) {
      x = 0, j = -1;while (++j < n) {
        x += matrix[i][j];
      }
      groupSums.push(x);
      subgroupIndex.push(range(n));
      k += x;
    }

    // Sort groups…
    if (sortGroups) groupIndex.sort(function (a, b) {
      return sortGroups(groupSums[a], groupSums[b]);
    });

    // Sort subgroups…
    if (sortSubgroups) subgroupIndex.forEach(function (d, i) {
      d.sort(function (a, b) {
        return sortSubgroups(matrix[i][a], matrix[i][b]);
      });
    });

    // Convert the sum to scaling factor for [0, 2pi].
    // TODO Allow start and end angle to be specified?
    // TODO Allow padding to be specified as percentage?
    k = max$1(0, tau$3 - padAngle * n) / k;
    dx = k ? padAngle : tau$3 / n;

    // Compute the start and end angle for each group and subgroup.
    // Note: Opera has a bug reordering object literal properties!
    x = 0, i = -1;while (++i < n) {
      x0 = x, j = -1;while (++j < n) {
        var di = groupIndex[i],
            dj = subgroupIndex[di][j],
            v = matrix[di][dj],
            a0 = x,
            a1 = x += v * k;
        subgroups[dj * n + di] = {
          index: di,
          subindex: dj,
          startAngle: a0,
          endAngle: a1,
          value: v
        };
      }
      groups[di] = {
        index: di,
        startAngle: x0,
        endAngle: x,
        value: groupSums[di]
      };
      x += dx;
    }

    // Generate chords for each (non-empty) subgroup-subgroup link.
    i = -1;while (++i < n) {
      j = i - 1;while (++j < n) {
        var source = subgroups[j * n + i],
            target = subgroups[i * n + j];
        if (source.value || target.value) {
          chords.push(source.value < target.value ? { source: target, target: source } : { source: source, target: target });
        }
      }
    }

    return sortChords ? chords.sort(sortChords) : chords;
  }

  chord.padAngle = function (_) {
    return arguments.length ? (padAngle = max$1(0, _), chord) : padAngle;
  };

  chord.sortGroups = function (_) {
    return arguments.length ? (sortGroups = _, chord) : sortGroups;
  };

  chord.sortSubgroups = function (_) {
    return arguments.length ? (sortSubgroups = _, chord) : sortSubgroups;
  };

  chord.sortChords = function (_) {
    return arguments.length ? (_ == null ? sortChords = null : (sortChords = compareValue(_))._ = _, chord) : sortChords && sortChords._;
  };

  return chord;
};

var slice$4 = Array.prototype.slice;

var constant$11 = function (x) {
  return function () {
    return x;
  };
};

function defaultSource(d) {
  return d.source;
}

function defaultTarget(d) {
  return d.target;
}

function defaultRadius$1(d) {
  return d.radius;
}

function defaultStartAngle(d) {
  return d.startAngle;
}

function defaultEndAngle(d) {
  return d.endAngle;
}

var ribbon = function () {
  var source = defaultSource,
      target = defaultTarget,
      radius = defaultRadius$1,
      startAngle = defaultStartAngle,
      endAngle = defaultEndAngle,
      context = null;

  function ribbon() {
    var buffer,
        argv = slice$4.call(arguments),
        s = source.apply(this, argv),
        t = target.apply(this, argv),
        sr = +radius.apply(this, (argv[0] = s, argv)),
        sa0 = startAngle.apply(this, argv) - halfPi$2,
        sa1 = endAngle.apply(this, argv) - halfPi$2,
        sx0 = sr * cos(sa0),
        sy0 = sr * sin(sa0),
        tr = +radius.apply(this, (argv[0] = t, argv)),
        ta0 = startAngle.apply(this, argv) - halfPi$2,
        ta1 = endAngle.apply(this, argv) - halfPi$2;

    if (!context) context = buffer = path();

    context.moveTo(sx0, sy0);
    context.arc(0, 0, sr, sa0, sa1);
    if (sa0 !== ta0 || sa1 !== ta1) {
      // TODO sr !== tr?
      context.quadraticCurveTo(0, 0, tr * cos(ta0), tr * sin(ta0));
      context.arc(0, 0, tr, ta0, ta1);
    }
    context.quadraticCurveTo(0, 0, sx0, sy0);
    context.closePath();

    if (buffer) return context = null, buffer + "" || null;
  }

  ribbon.radius = function (_) {
    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$11(+_), ribbon) : radius;
  };

  ribbon.startAngle = function (_) {
    return arguments.length ? (startAngle = typeof _ === "function" ? _ : constant$11(+_), ribbon) : startAngle;
  };

  ribbon.endAngle = function (_) {
    return arguments.length ? (endAngle = typeof _ === "function" ? _ : constant$11(+_), ribbon) : endAngle;
  };

  ribbon.source = function (_) {
    return arguments.length ? (source = _, ribbon) : source;
  };

  ribbon.target = function (_) {
    return arguments.length ? (target = _, ribbon) : target;
  };

  ribbon.context = function (_) {
    return arguments.length ? (context = _ == null ? null : _, ribbon) : context;
  };

  return ribbon;
};

// Adds floating point numbers with twice the normal precision.
// Reference: J. R. Shewchuk, Adaptive Precision Floating-Point Arithmetic and
// Fast Robust Geometric Predicates, Discrete & Computational Geometry 18(3)
// 305–363 (1997).
// Code adapted from GeographicLib by Charles F. F. Karney,
// http://geographiclib.sourceforge.net/

var adder = function () {
  return new Adder();
};

function Adder() {
  this.reset();
}

Adder.prototype = {
  constructor: Adder,
  reset: function reset() {
    this.s = // rounded value
    this.t = 0; // exact error
  },
  add: function add(y) {
    _add(temp, y, this.t);
    _add(this, temp.s, this.s);
    if (this.s) this.t += temp.t;else this.s = temp.t;
  },
  valueOf: function valueOf() {
    return this.s;
  }
};

var temp = new Adder();

function _add(adder, a, b) {
  var x = adder.s = a + b,
      bv = x - a,
      av = x - bv;
  adder.t = a - av + (b - bv);
}

var epsilon$4 = 1e-6;
var epsilon2$2 = 1e-12;
var pi$4 = Math.PI;
var halfPi$3 = pi$4 / 2;
var quarterPi = pi$4 / 4;
var tau$4 = pi$4 * 2;

var degrees$1 = 180 / pi$4;
var radians = pi$4 / 180;

var abs = Math.abs;
var atan = Math.atan;
var atan2 = Math.atan2;
var cos$1 = Math.cos;
var ceil$1 = Math.ceil;
var exp = Math.exp;

var log$1 = Math.log;
var pow$1 = Math.pow;
var sin$1 = Math.sin;
var sign$1 = Math.sign || function (x) {
  return x > 0 ? 1 : x < 0 ? -1 : 0;
};
var sqrt$1 = Math.sqrt;
var tan = Math.tan;

function acos(x) {
  return x > 1 ? 0 : x < -1 ? pi$4 : Math.acos(x);
}

function asin$1(x) {
  return x > 1 ? halfPi$3 : x < -1 ? -halfPi$3 : Math.asin(x);
}

function haversin(x) {
  return (x = sin$1(x / 2)) * x;
}

function noop$2() {}

function streamGeometry(geometry, stream) {
  if (geometry && streamGeometryType.hasOwnProperty(geometry.type)) {
    streamGeometryType[geometry.type](geometry, stream);
  }
}

var streamObjectType = {
  Feature: function Feature(feature, stream) {
    streamGeometry(feature.geometry, stream);
  },
  FeatureCollection: function FeatureCollection(object, stream) {
    var features = object.features,
        i = -1,
        n = features.length;
    while (++i < n) {
      streamGeometry(features[i].geometry, stream);
    }
  }
};

var streamGeometryType = {
  Sphere: function Sphere(object, stream) {
    stream.sphere();
  },
  Point: function Point(object, stream) {
    object = object.coordinates;
    stream.point(object[0], object[1], object[2]);
  },
  MultiPoint: function MultiPoint(object, stream) {
    var coordinates = object.coordinates,
        i = -1,
        n = coordinates.length;
    while (++i < n) {
      object = coordinates[i], stream.point(object[0], object[1], object[2]);
    }
  },
  LineString: function LineString(object, stream) {
    streamLine(object.coordinates, stream, 0);
  },
  MultiLineString: function MultiLineString(object, stream) {
    var coordinates = object.coordinates,
        i = -1,
        n = coordinates.length;
    while (++i < n) {
      streamLine(coordinates[i], stream, 0);
    }
  },
  Polygon: function Polygon(object, stream) {
    streamPolygon(object.coordinates, stream);
  },
  MultiPolygon: function MultiPolygon(object, stream) {
    var coordinates = object.coordinates,
        i = -1,
        n = coordinates.length;
    while (++i < n) {
      streamPolygon(coordinates[i], stream);
    }
  },
  GeometryCollection: function GeometryCollection(object, stream) {
    var geometries = object.geometries,
        i = -1,
        n = geometries.length;
    while (++i < n) {
      streamGeometry(geometries[i], stream);
    }
  }
};

function streamLine(coordinates, stream, closed) {
  var i = -1,
      n = coordinates.length - closed,
      coordinate;
  stream.lineStart();
  while (++i < n) {
    coordinate = coordinates[i], stream.point(coordinate[0], coordinate[1], coordinate[2]);
  }stream.lineEnd();
}

function streamPolygon(coordinates, stream) {
  var i = -1,
      n = coordinates.length;
  stream.polygonStart();
  while (++i < n) {
    streamLine(coordinates[i], stream, 1);
  }stream.polygonEnd();
}

var geoStream = function (object, stream) {
  if (object && streamObjectType.hasOwnProperty(object.type)) {
    streamObjectType[object.type](object, stream);
  } else {
    streamGeometry(object, stream);
  }
};

var areaRingSum = adder();

var areaSum = adder();
var lambda00;
var phi00;
var lambda0;
var cosPhi0;
var sinPhi0;

var areaStream = {
  point: noop$2,
  lineStart: noop$2,
  lineEnd: noop$2,
  polygonStart: function polygonStart() {
    areaRingSum.reset();
    areaStream.lineStart = areaRingStart;
    areaStream.lineEnd = areaRingEnd;
  },
  polygonEnd: function polygonEnd() {
    var areaRing = +areaRingSum;
    areaSum.add(areaRing < 0 ? tau$4 + areaRing : areaRing);
    this.lineStart = this.lineEnd = this.point = noop$2;
  },
  sphere: function sphere() {
    areaSum.add(tau$4);
  }
};

function areaRingStart() {
  areaStream.point = areaPointFirst;
}

function areaRingEnd() {
  areaPoint(lambda00, phi00);
}

function areaPointFirst(lambda, phi) {
  areaStream.point = areaPoint;
  lambda00 = lambda, phi00 = phi;
  lambda *= radians, phi *= radians;
  lambda0 = lambda, cosPhi0 = cos$1(phi = phi / 2 + quarterPi), sinPhi0 = sin$1(phi);
}

function areaPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  phi = phi / 2 + quarterPi; // half the angular distance from south pole

  // Spherical excess E for a spherical triangle with vertices: south pole,
  // previous point, current point.  Uses a formula derived from Cagnoli’s
  // theorem.  See Todhunter, Spherical Trig. (1871), Sec. 103, Eq. (2).
  var dLambda = lambda - lambda0,
      sdLambda = dLambda >= 0 ? 1 : -1,
      adLambda = sdLambda * dLambda,
      cosPhi = cos$1(phi),
      sinPhi = sin$1(phi),
      k = sinPhi0 * sinPhi,
      u = cosPhi0 * cosPhi + k * cos$1(adLambda),
      v = k * sdLambda * sin$1(adLambda);
  areaRingSum.add(atan2(v, u));

  // Advance the previous points.
  lambda0 = lambda, cosPhi0 = cosPhi, sinPhi0 = sinPhi;
}

var area$2 = function (object) {
  areaSum.reset();
  geoStream(object, areaStream);
  return areaSum * 2;
};

function spherical(cartesian) {
  return [atan2(cartesian[1], cartesian[0]), asin$1(cartesian[2])];
}

function cartesian(spherical) {
  var lambda = spherical[0],
      phi = spherical[1],
      cosPhi = cos$1(phi);
  return [cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi)];
}

function cartesianDot(a, b) {
  return a[0] * b[0] + a[1] * b[1] + a[2] * b[2];
}

function cartesianCross(a, b) {
  return [a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]];
}

// TODO return a
function cartesianAddInPlace(a, b) {
  a[0] += b[0], a[1] += b[1], a[2] += b[2];
}

function cartesianScale(vector, k) {
  return [vector[0] * k, vector[1] * k, vector[2] * k];
}

// TODO return d
function cartesianNormalizeInPlace(d) {
  var l = sqrt$1(d[0] * d[0] + d[1] * d[1] + d[2] * d[2]);
  d[0] /= l, d[1] /= l, d[2] /= l;
}

var lambda0$1;
var phi0;
var lambda1;
var phi1;
var lambda2;
var lambda00$1;
var phi00$1;
var p0;
var deltaSum = adder();
var ranges;
var range$1;

var boundsStream = {
  point: boundsPoint,
  lineStart: boundsLineStart,
  lineEnd: boundsLineEnd,
  polygonStart: function polygonStart() {
    boundsStream.point = boundsRingPoint;
    boundsStream.lineStart = boundsRingStart;
    boundsStream.lineEnd = boundsRingEnd;
    deltaSum.reset();
    areaStream.polygonStart();
  },
  polygonEnd: function polygonEnd() {
    areaStream.polygonEnd();
    boundsStream.point = boundsPoint;
    boundsStream.lineStart = boundsLineStart;
    boundsStream.lineEnd = boundsLineEnd;
    if (areaRingSum < 0) lambda0$1 = -(lambda1 = 180), phi0 = -(phi1 = 90);else if (deltaSum > epsilon$4) phi1 = 90;else if (deltaSum < -epsilon$4) phi0 = -90;
    range$1[0] = lambda0$1, range$1[1] = lambda1;
  }
};

function boundsPoint(lambda, phi) {
  ranges.push(range$1 = [lambda0$1 = lambda, lambda1 = lambda]);
  if (phi < phi0) phi0 = phi;
  if (phi > phi1) phi1 = phi;
}

function linePoint(lambda, phi) {
  var p = cartesian([lambda * radians, phi * radians]);
  if (p0) {
    var normal = cartesianCross(p0, p),
        equatorial = [normal[1], -normal[0], 0],
        inflection = cartesianCross(equatorial, normal);
    cartesianNormalizeInPlace(inflection);
    inflection = spherical(inflection);
    var delta = lambda - lambda2,
        sign$$1 = delta > 0 ? 1 : -1,
        lambdai = inflection[0] * degrees$1 * sign$$1,
        phii,
        antimeridian = abs(delta) > 180;
    if (antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
      phii = inflection[1] * degrees$1;
      if (phii > phi1) phi1 = phii;
    } else if (lambdai = (lambdai + 360) % 360 - 180, antimeridian ^ (sign$$1 * lambda2 < lambdai && lambdai < sign$$1 * lambda)) {
      phii = -inflection[1] * degrees$1;
      if (phii < phi0) phi0 = phii;
    } else {
      if (phi < phi0) phi0 = phi;
      if (phi > phi1) phi1 = phi;
    }
    if (antimeridian) {
      if (lambda < lambda2) {
        if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
      } else {
        if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
      }
    } else {
      if (lambda1 >= lambda0$1) {
        if (lambda < lambda0$1) lambda0$1 = lambda;
        if (lambda > lambda1) lambda1 = lambda;
      } else {
        if (lambda > lambda2) {
          if (angle(lambda0$1, lambda) > angle(lambda0$1, lambda1)) lambda1 = lambda;
        } else {
          if (angle(lambda, lambda1) > angle(lambda0$1, lambda1)) lambda0$1 = lambda;
        }
      }
    }
  } else {
    boundsPoint(lambda, phi);
  }
  p0 = p, lambda2 = lambda;
}

function boundsLineStart() {
  boundsStream.point = linePoint;
}

function boundsLineEnd() {
  range$1[0] = lambda0$1, range$1[1] = lambda1;
  boundsStream.point = boundsPoint;
  p0 = null;
}

function boundsRingPoint(lambda, phi) {
  if (p0) {
    var delta = lambda - lambda2;
    deltaSum.add(abs(delta) > 180 ? delta + (delta > 0 ? 360 : -360) : delta);
  } else {
    lambda00$1 = lambda, phi00$1 = phi;
  }
  areaStream.point(lambda, phi);
  linePoint(lambda, phi);
}

function boundsRingStart() {
  areaStream.lineStart();
}

function boundsRingEnd() {
  boundsRingPoint(lambda00$1, phi00$1);
  areaStream.lineEnd();
  if (abs(deltaSum) > epsilon$4) lambda0$1 = -(lambda1 = 180);
  range$1[0] = lambda0$1, range$1[1] = lambda1;
  p0 = null;
}

// Finds the left-right distance between two longitudes.
// This is almost the same as (lambda1 - lambda0 + 360°) % 360°, except that we want
// the distance between ±180° to be 360°.
function angle(lambda0, lambda1) {
  return (lambda1 -= lambda0) < 0 ? lambda1 + 360 : lambda1;
}

function rangeCompare(a, b) {
  return a[0] - b[0];
}

function rangeContains(range, x) {
  return range[0] <= range[1] ? range[0] <= x && x <= range[1] : x < range[0] || range[1] < x;
}

var bounds = function (feature) {
  var i, n, a, b, merged, deltaMax, delta;

  phi1 = lambda1 = -(lambda0$1 = phi0 = Infinity);
  ranges = [];
  geoStream(feature, boundsStream);

  // First, sort ranges by their minimum longitudes.
  if (n = ranges.length) {
    ranges.sort(rangeCompare);

    // Then, merge any ranges that overlap.
    for (i = 1, a = ranges[0], merged = [a]; i < n; ++i) {
      b = ranges[i];
      if (rangeContains(a, b[0]) || rangeContains(a, b[1])) {
        if (angle(a[0], b[1]) > angle(a[0], a[1])) a[1] = b[1];
        if (angle(b[0], a[1]) > angle(a[0], a[1])) a[0] = b[0];
      } else {
        merged.push(a = b);
      }
    }

    // Finally, find the largest gap between the merged ranges.
    // The final bounding box will be the inverse of this gap.
    for (deltaMax = -Infinity, n = merged.length - 1, i = 0, a = merged[n]; i <= n; a = b, ++i) {
      b = merged[i];
      if ((delta = angle(a[1], b[0])) > deltaMax) deltaMax = delta, lambda0$1 = b[0], lambda1 = a[1];
    }
  }

  ranges = range$1 = null;

  return lambda0$1 === Infinity || phi0 === Infinity ? [[NaN, NaN], [NaN, NaN]] : [[lambda0$1, phi0], [lambda1, phi1]];
};

var W0;
var W1;
var X0;
var Y0;
var Z0;
var X1;
var Y1;
var Z1;
var X2;
var Y2;
var Z2;
var lambda00$2;
var phi00$2;
var x0;
var y0;
var z0; // previous point

var centroidStream = {
  sphere: noop$2,
  point: centroidPoint,
  lineStart: centroidLineStart,
  lineEnd: centroidLineEnd,
  polygonStart: function polygonStart() {
    centroidStream.lineStart = centroidRingStart;
    centroidStream.lineEnd = centroidRingEnd;
  },
  polygonEnd: function polygonEnd() {
    centroidStream.lineStart = centroidLineStart;
    centroidStream.lineEnd = centroidLineEnd;
  }
};

// Arithmetic mean of Cartesian vectors.
function centroidPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi);
  centroidPointCartesian(cosPhi * cos$1(lambda), cosPhi * sin$1(lambda), sin$1(phi));
}

function centroidPointCartesian(x, y, z) {
  ++W0;
  X0 += (x - X0) / W0;
  Y0 += (y - Y0) / W0;
  Z0 += (z - Z0) / W0;
}

function centroidLineStart() {
  centroidStream.point = centroidLinePointFirst;
}

function centroidLinePointFirst(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi);
  x0 = cosPhi * cos$1(lambda);
  y0 = cosPhi * sin$1(lambda);
  z0 = sin$1(phi);
  centroidStream.point = centroidLinePoint;
  centroidPointCartesian(x0, y0, z0);
}

function centroidLinePoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi),
      x = cosPhi * cos$1(lambda),
      y = cosPhi * sin$1(lambda),
      z = sin$1(phi),
      w = atan2(sqrt$1((w = y0 * z - z0 * y) * w + (w = z0 * x - x0 * z) * w + (w = x0 * y - y0 * x) * w), x0 * x + y0 * y + z0 * z);
  W1 += w;
  X1 += w * (x0 + (x0 = x));
  Y1 += w * (y0 + (y0 = y));
  Z1 += w * (z0 + (z0 = z));
  centroidPointCartesian(x0, y0, z0);
}

function centroidLineEnd() {
  centroidStream.point = centroidPoint;
}

// See J. E. Brock, The Inertia Tensor for a Spherical Triangle,
// J. Applied Mechanics 42, 239 (1975).
function centroidRingStart() {
  centroidStream.point = centroidRingPointFirst;
}

function centroidRingEnd() {
  centroidRingPoint(lambda00$2, phi00$2);
  centroidStream.point = centroidPoint;
}

function centroidRingPointFirst(lambda, phi) {
  lambda00$2 = lambda, phi00$2 = phi;
  lambda *= radians, phi *= radians;
  centroidStream.point = centroidRingPoint;
  var cosPhi = cos$1(phi);
  x0 = cosPhi * cos$1(lambda);
  y0 = cosPhi * sin$1(lambda);
  z0 = sin$1(phi);
  centroidPointCartesian(x0, y0, z0);
}

function centroidRingPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var cosPhi = cos$1(phi),
      x = cosPhi * cos$1(lambda),
      y = cosPhi * sin$1(lambda),
      z = sin$1(phi),
      cx = y0 * z - z0 * y,
      cy = z0 * x - x0 * z,
      cz = x0 * y - y0 * x,
      m = sqrt$1(cx * cx + cy * cy + cz * cz),
      u = x0 * x + y0 * y + z0 * z,
      v = m && -acos(u) / m,
      // area weight
  w = atan2(m, u); // line weight
  X2 += v * cx;
  Y2 += v * cy;
  Z2 += v * cz;
  W1 += w;
  X1 += w * (x0 + (x0 = x));
  Y1 += w * (y0 + (y0 = y));
  Z1 += w * (z0 + (z0 = z));
  centroidPointCartesian(x0, y0, z0);
}

var centroid$1 = function (object) {
  W0 = W1 = X0 = Y0 = Z0 = X1 = Y1 = Z1 = X2 = Y2 = Z2 = 0;
  geoStream(object, centroidStream);

  var x = X2,
      y = Y2,
      z = Z2,
      m = x * x + y * y + z * z;

  // If the area-weighted ccentroid is undefined, fall back to length-weighted ccentroid.
  if (m < epsilon2$2) {
    x = X1, y = Y1, z = Z1;
    // If the feature has zero length, fall back to arithmetic mean of point vectors.
    if (W1 < epsilon$4) x = X0, y = Y0, z = Z0;
    m = x * x + y * y + z * z;
    // If the feature still has an undefined ccentroid, then return.
    if (m < epsilon2$2) return [NaN, NaN];
  }

  return [atan2(y, x) * degrees$1, asin$1(z / sqrt$1(m)) * degrees$1];
};

var constant$12 = function (x) {
  return function () {
    return x;
  };
};

var compose = function (a, b) {

  function compose(x, y) {
    return x = a(x, y), b(x[0], x[1]);
  }

  if (a.invert && b.invert) compose.invert = function (x, y) {
    return x = b.invert(x, y), x && a.invert(x[0], x[1]);
  };

  return compose;
};

function rotationIdentity(lambda, phi) {
  return [lambda > pi$4 ? lambda - tau$4 : lambda < -pi$4 ? lambda + tau$4 : lambda, phi];
}

rotationIdentity.invert = rotationIdentity;

function rotateRadians(deltaLambda, deltaPhi, deltaGamma) {
  return (deltaLambda %= tau$4) ? deltaPhi || deltaGamma ? compose(rotationLambda(deltaLambda), rotationPhiGamma(deltaPhi, deltaGamma)) : rotationLambda(deltaLambda) : deltaPhi || deltaGamma ? rotationPhiGamma(deltaPhi, deltaGamma) : rotationIdentity;
}

function forwardRotationLambda(deltaLambda) {
  return function (lambda, phi) {
    return lambda += deltaLambda, [lambda > pi$4 ? lambda - tau$4 : lambda < -pi$4 ? lambda + tau$4 : lambda, phi];
  };
}

function rotationLambda(deltaLambda) {
  var rotation = forwardRotationLambda(deltaLambda);
  rotation.invert = forwardRotationLambda(-deltaLambda);
  return rotation;
}

function rotationPhiGamma(deltaPhi, deltaGamma) {
  var cosDeltaPhi = cos$1(deltaPhi),
      sinDeltaPhi = sin$1(deltaPhi),
      cosDeltaGamma = cos$1(deltaGamma),
      sinDeltaGamma = sin$1(deltaGamma);

  function rotation(lambda, phi) {
    var cosPhi = cos$1(phi),
        x = cos$1(lambda) * cosPhi,
        y = sin$1(lambda) * cosPhi,
        z = sin$1(phi),
        k = z * cosDeltaPhi + x * sinDeltaPhi;
    return [atan2(y * cosDeltaGamma - k * sinDeltaGamma, x * cosDeltaPhi - z * sinDeltaPhi), asin$1(k * cosDeltaGamma + y * sinDeltaGamma)];
  }

  rotation.invert = function (lambda, phi) {
    var cosPhi = cos$1(phi),
        x = cos$1(lambda) * cosPhi,
        y = sin$1(lambda) * cosPhi,
        z = sin$1(phi),
        k = z * cosDeltaGamma - y * sinDeltaGamma;
    return [atan2(y * cosDeltaGamma + z * sinDeltaGamma, x * cosDeltaPhi + k * sinDeltaPhi), asin$1(k * cosDeltaPhi - x * sinDeltaPhi)];
  };

  return rotation;
}

var rotation = function (rotate) {
  rotate = rotateRadians(rotate[0] * radians, rotate[1] * radians, rotate.length > 2 ? rotate[2] * radians : 0);

  function forward(coordinates) {
    coordinates = rotate(coordinates[0] * radians, coordinates[1] * radians);
    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
  }

  forward.invert = function (coordinates) {
    coordinates = rotate.invert(coordinates[0] * radians, coordinates[1] * radians);
    return coordinates[0] *= degrees$1, coordinates[1] *= degrees$1, coordinates;
  };

  return forward;
};

// Generates a circle centered at [0°, 0°], with a given radius and precision.
function circleStream(stream, radius, delta, direction, t0, t1) {
  if (!delta) return;
  var cosRadius = cos$1(radius),
      sinRadius = sin$1(radius),
      step = direction * delta;
  if (t0 == null) {
    t0 = radius + direction * tau$4;
    t1 = radius - step / 2;
  } else {
    t0 = circleRadius(cosRadius, t0);
    t1 = circleRadius(cosRadius, t1);
    if (direction > 0 ? t0 < t1 : t0 > t1) t0 += direction * tau$4;
  }
  for (var point, t = t0; direction > 0 ? t > t1 : t < t1; t -= step) {
    point = spherical([cosRadius, -sinRadius * cos$1(t), -sinRadius * sin$1(t)]);
    stream.point(point[0], point[1]);
  }
}

// Returns the signed angle of a cartesian point relative to [cosRadius, 0, 0].
function circleRadius(cosRadius, point) {
  point = cartesian(point), point[0] -= cosRadius;
  cartesianNormalizeInPlace(point);
  var radius = acos(-point[1]);
  return ((-point[2] < 0 ? -radius : radius) + tau$4 - epsilon$4) % tau$4;
}

var circle$1 = function () {
  var center = constant$12([0, 0]),
      radius = constant$12(90),
      precision = constant$12(6),
      ring,
      rotate,
      stream = { point: point };

  function point(x, y) {
    ring.push(x = rotate(x, y));
    x[0] *= degrees$1, x[1] *= degrees$1;
  }

  function circle() {
    var c = center.apply(this, arguments),
        r = radius.apply(this, arguments) * radians,
        p = precision.apply(this, arguments) * radians;
    ring = [];
    rotate = rotateRadians(-c[0] * radians, -c[1] * radians, 0).invert;
    circleStream(stream, r, p, 1);
    c = { type: "Polygon", coordinates: [ring] };
    ring = rotate = null;
    return c;
  }

  circle.center = function (_) {
    return arguments.length ? (center = typeof _ === "function" ? _ : constant$12([+_[0], +_[1]]), circle) : center;
  };

  circle.radius = function (_) {
    return arguments.length ? (radius = typeof _ === "function" ? _ : constant$12(+_), circle) : radius;
  };

  circle.precision = function (_) {
    return arguments.length ? (precision = typeof _ === "function" ? _ : constant$12(+_), circle) : precision;
  };

  return circle;
};

var clipBuffer = function () {
  var lines = [],
      line;
  return {
    point: function point(x, y) {
      line.push([x, y]);
    },
    lineStart: function lineStart() {
      lines.push(line = []);
    },
    lineEnd: noop$2,
    rejoin: function rejoin() {
      if (lines.length > 1) lines.push(lines.pop().concat(lines.shift()));
    },
    result: function result() {
      var result = lines;
      lines = [];
      line = null;
      return result;
    }
  };
};

var clipLine = function (a, b, x0, y0, x1, y1) {
  var ax = a[0],
      ay = a[1],
      bx = b[0],
      by = b[1],
      t0 = 0,
      t1 = 1,
      dx = bx - ax,
      dy = by - ay,
      r;

  r = x0 - ax;
  if (!dx && r > 0) return;
  r /= dx;
  if (dx < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dx > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = x1 - ax;
  if (!dx && r < 0) return;
  r /= dx;
  if (dx < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dx > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  r = y0 - ay;
  if (!dy && r > 0) return;
  r /= dy;
  if (dy < 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  } else if (dy > 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  }

  r = y1 - ay;
  if (!dy && r < 0) return;
  r /= dy;
  if (dy < 0) {
    if (r > t1) return;
    if (r > t0) t0 = r;
  } else if (dy > 0) {
    if (r < t0) return;
    if (r < t1) t1 = r;
  }

  if (t0 > 0) a[0] = ax + t0 * dx, a[1] = ay + t0 * dy;
  if (t1 < 1) b[0] = ax + t1 * dx, b[1] = ay + t1 * dy;
  return true;
};

var pointEqual = function (a, b) {
  return abs(a[0] - b[0]) < epsilon$4 && abs(a[1] - b[1]) < epsilon$4;
};

function Intersection(point, points, other, entry) {
  this.x = point;
  this.z = points;
  this.o = other; // another intersection
  this.e = entry; // is an entry?
  this.v = false; // visited
  this.n = this.p = null; // next & previous
}

// A generalized polygon clipping algorithm: given a polygon that has been cut
// into its visible line segments, and rejoins the segments by interpolating
// along the clip edge.
var clipPolygon = function (segments, compareIntersection, startInside, interpolate, stream) {
  var subject = [],
      clip = [],
      i,
      n;

  segments.forEach(function (segment) {
    if ((n = segment.length - 1) <= 0) return;
    var n,
        p0 = segment[0],
        p1 = segment[n],
        x;

    // If the first and last points of a segment are coincident, then treat as a
    // closed ring. TODO if all rings are closed, then the winding order of the
    // exterior ring should be checked.
    if (pointEqual(p0, p1)) {
      stream.lineStart();
      for (i = 0; i < n; ++i) {
        stream.point((p0 = segment[i])[0], p0[1]);
      }stream.lineEnd();
      return;
    }

    subject.push(x = new Intersection(p0, segment, null, true));
    clip.push(x.o = new Intersection(p0, null, x, false));
    subject.push(x = new Intersection(p1, segment, null, false));
    clip.push(x.o = new Intersection(p1, null, x, true));
  });

  if (!subject.length) return;

  clip.sort(compareIntersection);
  link(subject);
  link(clip);

  for (i = 0, n = clip.length; i < n; ++i) {
    clip[i].e = startInside = !startInside;
  }

  var start = subject[0],
      points,
      point;

  while (1) {
    // Find first unvisited intersection.
    var current = start,
        isSubject = true;
    while (current.v) {
      if ((current = current.n) === start) return;
    }points = current.z;
    stream.lineStart();
    do {
      current.v = current.o.v = true;
      if (current.e) {
        if (isSubject) {
          for (i = 0, n = points.length; i < n; ++i) {
            stream.point((point = points[i])[0], point[1]);
          }
        } else {
          interpolate(current.x, current.n.x, 1, stream);
        }
        current = current.n;
      } else {
        if (isSubject) {
          points = current.p.z;
          for (i = points.length - 1; i >= 0; --i) {
            stream.point((point = points[i])[0], point[1]);
          }
        } else {
          interpolate(current.x, current.p.x, -1, stream);
        }
        current = current.p;
      }
      current = current.o;
      points = current.z;
      isSubject = !isSubject;
    } while (!current.v);
    stream.lineEnd();
  }
};

function link(array) {
  if (!(n = array.length)) return;
  var n,
      i = 0,
      a = array[0],
      b;
  while (++i < n) {
    a.n = b = array[i];
    b.p = a;
    a = b;
  }
  a.n = b = array[0];
  b.p = a;
}

var clipMax = 1e9;
var clipMin = -clipMax;

// TODO Use d3-polygon’s polygonContains here for the ring check?
// TODO Eliminate duplicate buffering in clipBuffer and polygon.push?

function clipExtent$1(x0, y0, x1, y1) {

  function visible(x, y) {
    return x0 <= x && x <= x1 && y0 <= y && y <= y1;
  }

  function interpolate(from, to, direction, stream) {
    var a = 0,
        a1 = 0;
    if (from == null || (a = corner(from, direction)) !== (a1 = corner(to, direction)) || comparePoint(from, to) < 0 ^ direction > 0) {
      do {
        stream.point(a === 0 || a === 3 ? x0 : x1, a > 1 ? y1 : y0);
      } while ((a = (a + direction + 4) % 4) !== a1);
    } else {
      stream.point(to[0], to[1]);
    }
  }

  function corner(p, direction) {
    return abs(p[0] - x0) < epsilon$4 ? direction > 0 ? 0 : 3 : abs(p[0] - x1) < epsilon$4 ? direction > 0 ? 2 : 1 : abs(p[1] - y0) < epsilon$4 ? direction > 0 ? 1 : 0 : direction > 0 ? 3 : 2; // abs(p[1] - y1) < epsilon
  }

  function compareIntersection(a, b) {
    return comparePoint(a.x, b.x);
  }

  function comparePoint(a, b) {
    var ca = corner(a, 1),
        cb = corner(b, 1);
    return ca !== cb ? ca - cb : ca === 0 ? b[1] - a[1] : ca === 1 ? a[0] - b[0] : ca === 2 ? a[1] - b[1] : b[0] - a[0];
  }

  return function (stream) {
    var activeStream = stream,
        bufferStream = clipBuffer(),
        segments,
        polygon,
        ring,
        x__,
        y__,
        v__,
        // first point
    x_,
        y_,
        v_,
        // previous point
    first,
        clean;

    var clipStream = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: polygonStart,
      polygonEnd: polygonEnd
    };

    function point(x, y) {
      if (visible(x, y)) activeStream.point(x, y);
    }

    function polygonInside() {
      var winding = 0;

      for (var i = 0, n = polygon.length; i < n; ++i) {
        for (var ring = polygon[i], j = 1, m = ring.length, point = ring[0], a0, a1, b0 = point[0], b1 = point[1]; j < m; ++j) {
          a0 = b0, a1 = b1, point = ring[j], b0 = point[0], b1 = point[1];
          if (a1 <= y1) {
            if (b1 > y1 && (b0 - a0) * (y1 - a1) > (b1 - a1) * (x0 - a0)) ++winding;
          } else {
            if (b1 <= y1 && (b0 - a0) * (y1 - a1) < (b1 - a1) * (x0 - a0)) --winding;
          }
        }
      }

      return winding;
    }

    // Buffer geometry within a polygon and then clip it en masse.
    function polygonStart() {
      activeStream = bufferStream, segments = [], polygon = [], clean = true;
    }

    function polygonEnd() {
      var startInside = polygonInside(),
          cleanInside = clean && startInside,
          visible = (segments = merge(segments)).length;
      if (cleanInside || visible) {
        stream.polygonStart();
        if (cleanInside) {
          stream.lineStart();
          interpolate(null, null, 1, stream);
          stream.lineEnd();
        }
        if (visible) {
          clipPolygon(segments, compareIntersection, startInside, interpolate, stream);
        }
        stream.polygonEnd();
      }
      activeStream = stream, segments = polygon = ring = null;
    }

    function lineStart() {
      clipStream.point = linePoint;
      if (polygon) polygon.push(ring = []);
      first = true;
      v_ = false;
      x_ = y_ = NaN;
    }

    // TODO rather than special-case polygons, simply handle them separately.
    // Ideally, coincident intersection points should be jittered to avoid
    // clipping issues.
    function lineEnd() {
      if (segments) {
        linePoint(x__, y__);
        if (v__ && v_) bufferStream.rejoin();
        segments.push(bufferStream.result());
      }
      clipStream.point = point;
      if (v_) activeStream.lineEnd();
    }

    function linePoint(x, y) {
      var v = visible(x, y);
      if (polygon) ring.push([x, y]);
      if (first) {
        x__ = x, y__ = y, v__ = v;
        first = false;
        if (v) {
          activeStream.lineStart();
          activeStream.point(x, y);
        }
      } else {
        if (v && v_) activeStream.point(x, y);else {
          var a = [x_ = Math.max(clipMin, Math.min(clipMax, x_)), y_ = Math.max(clipMin, Math.min(clipMax, y_))],
              b = [x = Math.max(clipMin, Math.min(clipMax, x)), y = Math.max(clipMin, Math.min(clipMax, y))];
          if (clipLine(a, b, x0, y0, x1, y1)) {
            if (!v_) {
              activeStream.lineStart();
              activeStream.point(a[0], a[1]);
            }
            activeStream.point(b[0], b[1]);
            if (!v) activeStream.lineEnd();
            clean = false;
          } else if (v) {
            activeStream.lineStart();
            activeStream.point(x, y);
            clean = false;
          }
        }
      }
      x_ = x, y_ = y, v_ = v;
    }

    return clipStream;
  };
}

var extent$2 = function () {
  var x0 = 0,
      y0 = 0,
      x1 = 960,
      y1 = 500,
      cache,
      cacheStream,
      clip;

  return clip = {
    stream: function stream(_stream) {
      return cache && cacheStream === _stream ? cache : cache = clipExtent$1(x0, y0, x1, y1)(cacheStream = _stream);
    },
    extent: function extent(_) {
      return arguments.length ? (x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1], cache = cacheStream = null, clip) : [[x0, y0], [x1, y1]];
    }
  };
};

var lengthSum = adder();
var lambda0$2;
var sinPhi0$1;
var cosPhi0$1;

var lengthStream = {
  sphere: noop$2,
  point: noop$2,
  lineStart: lengthLineStart,
  lineEnd: noop$2,
  polygonStart: noop$2,
  polygonEnd: noop$2
};

function lengthLineStart() {
  lengthStream.point = lengthPointFirst;
  lengthStream.lineEnd = lengthLineEnd;
}

function lengthLineEnd() {
  lengthStream.point = lengthStream.lineEnd = noop$2;
}

function lengthPointFirst(lambda, phi) {
  lambda *= radians, phi *= radians;
  lambda0$2 = lambda, sinPhi0$1 = sin$1(phi), cosPhi0$1 = cos$1(phi);
  lengthStream.point = lengthPoint;
}

function lengthPoint(lambda, phi) {
  lambda *= radians, phi *= radians;
  var sinPhi = sin$1(phi),
      cosPhi = cos$1(phi),
      delta = abs(lambda - lambda0$2),
      cosDelta = cos$1(delta),
      sinDelta = sin$1(delta),
      x = cosPhi * sinDelta,
      y = cosPhi0$1 * sinPhi - sinPhi0$1 * cosPhi * cosDelta,
      z = sinPhi0$1 * sinPhi + cosPhi0$1 * cosPhi * cosDelta;
  lengthSum.add(atan2(sqrt$1(x * x + y * y), z));
  lambda0$2 = lambda, sinPhi0$1 = sinPhi, cosPhi0$1 = cosPhi;
}

var length$2 = function (object) {
  lengthSum.reset();
  geoStream(object, lengthStream);
  return +lengthSum;
};

var coordinates = [null, null];
var object$2 = { type: "LineString", coordinates: coordinates };

var distance = function (a, b) {
  coordinates[0] = a;
  coordinates[1] = b;
  return length$2(object$2);
};

function graticuleX(y0, y1, dy) {
  var y = range(y0, y1 - epsilon$4, dy).concat(y1);
  return function (x) {
    return y.map(function (y) {
      return [x, y];
    });
  };
}

function graticuleY(x0, x1, dx) {
  var x = range(x0, x1 - epsilon$4, dx).concat(x1);
  return function (y) {
    return x.map(function (x) {
      return [x, y];
    });
  };
}

function graticule() {
  var x1,
      x0,
      X1,
      X0,
      y1,
      y0,
      Y1,
      Y0,
      dx = 10,
      dy = dx,
      DX = 90,
      DY = 360,
      x,
      y,
      X,
      Y,
      precision = 2.5;

  function graticule() {
    return { type: "MultiLineString", coordinates: lines() };
  }

  function lines() {
    return range(ceil$1(X0 / DX) * DX, X1, DX).map(X).concat(range(ceil$1(Y0 / DY) * DY, Y1, DY).map(Y)).concat(range(ceil$1(x0 / dx) * dx, x1, dx).filter(function (x) {
      return abs(x % DX) > epsilon$4;
    }).map(x)).concat(range(ceil$1(y0 / dy) * dy, y1, dy).filter(function (y) {
      return abs(y % DY) > epsilon$4;
    }).map(y));
  }

  graticule.lines = function () {
    return lines().map(function (coordinates) {
      return { type: "LineString", coordinates: coordinates };
    });
  };

  graticule.outline = function () {
    return {
      type: "Polygon",
      coordinates: [X(X0).concat(Y(Y1).slice(1), X(X1).reverse().slice(1), Y(Y0).reverse().slice(1))]
    };
  };

  graticule.extent = function (_) {
    if (!arguments.length) return graticule.extentMinor();
    return graticule.extentMajor(_).extentMinor(_);
  };

  graticule.extentMajor = function (_) {
    if (!arguments.length) return [[X0, Y0], [X1, Y1]];
    X0 = +_[0][0], X1 = +_[1][0];
    Y0 = +_[0][1], Y1 = +_[1][1];
    if (X0 > X1) _ = X0, X0 = X1, X1 = _;
    if (Y0 > Y1) _ = Y0, Y0 = Y1, Y1 = _;
    return graticule.precision(precision);
  };

  graticule.extentMinor = function (_) {
    if (!arguments.length) return [[x0, y0], [x1, y1]];
    x0 = +_[0][0], x1 = +_[1][0];
    y0 = +_[0][1], y1 = +_[1][1];
    if (x0 > x1) _ = x0, x0 = x1, x1 = _;
    if (y0 > y1) _ = y0, y0 = y1, y1 = _;
    return graticule.precision(precision);
  };

  graticule.step = function (_) {
    if (!arguments.length) return graticule.stepMinor();
    return graticule.stepMajor(_).stepMinor(_);
  };

  graticule.stepMajor = function (_) {
    if (!arguments.length) return [DX, DY];
    DX = +_[0], DY = +_[1];
    return graticule;
  };

  graticule.stepMinor = function (_) {
    if (!arguments.length) return [dx, dy];
    dx = +_[0], dy = +_[1];
    return graticule;
  };

  graticule.precision = function (_) {
    if (!arguments.length) return precision;
    precision = +_;
    x = graticuleX(y0, y1, 90);
    y = graticuleY(x0, x1, precision);
    X = graticuleX(Y0, Y1, 90);
    Y = graticuleY(X0, X1, precision);
    return graticule;
  };

  return graticule.extentMajor([[-180, -90 + epsilon$4], [180, 90 - epsilon$4]]).extentMinor([[-180, -80 - epsilon$4], [180, 80 + epsilon$4]]);
}

function graticule10() {
  return graticule()();
}

var interpolate$2 = function (a, b) {
  var x0 = a[0] * radians,
      y0 = a[1] * radians,
      x1 = b[0] * radians,
      y1 = b[1] * radians,
      cy0 = cos$1(y0),
      sy0 = sin$1(y0),
      cy1 = cos$1(y1),
      sy1 = sin$1(y1),
      kx0 = cy0 * cos$1(x0),
      ky0 = cy0 * sin$1(x0),
      kx1 = cy1 * cos$1(x1),
      ky1 = cy1 * sin$1(x1),
      d = 2 * asin$1(sqrt$1(haversin(y1 - y0) + cy0 * cy1 * haversin(x1 - x0))),
      k = sin$1(d);

  var interpolate = d ? function (t) {
    var B = sin$1(t *= d) / k,
        A = sin$1(d - t) / k,
        x = A * kx0 + B * kx1,
        y = A * ky0 + B * ky1,
        z = A * sy0 + B * sy1;
    return [atan2(y, x) * degrees$1, atan2(z, sqrt$1(x * x + y * y)) * degrees$1];
  } : function () {
    return [x0 * degrees$1, y0 * degrees$1];
  };

  interpolate.distance = d;

  return interpolate;
};

var identity$7 = function (x) {
  return x;
};

var areaSum$1 = adder();
var areaRingSum$1 = adder();
var x00;
var y00;
var x0$1;
var y0$1;

var areaStream$1 = {
  point: noop$2,
  lineStart: noop$2,
  lineEnd: noop$2,
  polygonStart: function polygonStart() {
    areaStream$1.lineStart = areaRingStart$1;
    areaStream$1.lineEnd = areaRingEnd$1;
  },
  polygonEnd: function polygonEnd() {
    areaStream$1.lineStart = areaStream$1.lineEnd = areaStream$1.point = noop$2;
    areaSum$1.add(abs(areaRingSum$1));
    areaRingSum$1.reset();
  },
  result: function result() {
    var area = areaSum$1 / 2;
    areaSum$1.reset();
    return area;
  }
};

function areaRingStart$1() {
  areaStream$1.point = areaPointFirst$1;
}

function areaPointFirst$1(x, y) {
  areaStream$1.point = areaPoint$1;
  x00 = x0$1 = x, y00 = y0$1 = y;
}

function areaPoint$1(x, y) {
  areaRingSum$1.add(y0$1 * x - x0$1 * y);
  x0$1 = x, y0$1 = y;
}

function areaRingEnd$1() {
  areaPoint$1(x00, y00);
}

var x0$2 = Infinity;
var y0$2 = x0$2;
var x1 = -x0$2;
var y1 = x1;

var boundsStream$1 = {
  point: boundsPoint$1,
  lineStart: noop$2,
  lineEnd: noop$2,
  polygonStart: noop$2,
  polygonEnd: noop$2,
  result: function result() {
    var bounds = [[x0$2, y0$2], [x1, y1]];
    x1 = y1 = -(y0$2 = x0$2 = Infinity);
    return bounds;
  }
};

function boundsPoint$1(x, y) {
  if (x < x0$2) x0$2 = x;
  if (x > x1) x1 = x;
  if (y < y0$2) y0$2 = y;
  if (y > y1) y1 = y;
}

// TODO Enforce positive area for exterior, negative area for interior?

var X0$1 = 0;
var Y0$1 = 0;
var Z0$1 = 0;
var X1$1 = 0;
var Y1$1 = 0;
var Z1$1 = 0;
var X2$1 = 0;
var Y2$1 = 0;
var Z2$1 = 0;
var x00$1;
var y00$1;
var x0$3;
var y0$3;

var centroidStream$1 = {
  point: centroidPoint$1,
  lineStart: centroidLineStart$1,
  lineEnd: centroidLineEnd$1,
  polygonStart: function polygonStart() {
    centroidStream$1.lineStart = centroidRingStart$1;
    centroidStream$1.lineEnd = centroidRingEnd$1;
  },
  polygonEnd: function polygonEnd() {
    centroidStream$1.point = centroidPoint$1;
    centroidStream$1.lineStart = centroidLineStart$1;
    centroidStream$1.lineEnd = centroidLineEnd$1;
  },
  result: function result() {
    var centroid = Z2$1 ? [X2$1 / Z2$1, Y2$1 / Z2$1] : Z1$1 ? [X1$1 / Z1$1, Y1$1 / Z1$1] : Z0$1 ? [X0$1 / Z0$1, Y0$1 / Z0$1] : [NaN, NaN];
    X0$1 = Y0$1 = Z0$1 = X1$1 = Y1$1 = Z1$1 = X2$1 = Y2$1 = Z2$1 = 0;
    return centroid;
  }
};

function centroidPoint$1(x, y) {
  X0$1 += x;
  Y0$1 += y;
  ++Z0$1;
}

function centroidLineStart$1() {
  centroidStream$1.point = centroidPointFirstLine;
}

function centroidPointFirstLine(x, y) {
  centroidStream$1.point = centroidPointLine;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function centroidPointLine(x, y) {
  var dx = x - x0$3,
      dy = y - y0$3,
      z = sqrt$1(dx * dx + dy * dy);
  X1$1 += z * (x0$3 + x) / 2;
  Y1$1 += z * (y0$3 + y) / 2;
  Z1$1 += z;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function centroidLineEnd$1() {
  centroidStream$1.point = centroidPoint$1;
}

function centroidRingStart$1() {
  centroidStream$1.point = centroidPointFirstRing;
}

function centroidRingEnd$1() {
  centroidPointRing(x00$1, y00$1);
}

function centroidPointFirstRing(x, y) {
  centroidStream$1.point = centroidPointRing;
  centroidPoint$1(x00$1 = x0$3 = x, y00$1 = y0$3 = y);
}

function centroidPointRing(x, y) {
  var dx = x - x0$3,
      dy = y - y0$3,
      z = sqrt$1(dx * dx + dy * dy);

  X1$1 += z * (x0$3 + x) / 2;
  Y1$1 += z * (y0$3 + y) / 2;
  Z1$1 += z;

  z = y0$3 * x - x0$3 * y;
  X2$1 += z * (x0$3 + x);
  Y2$1 += z * (y0$3 + y);
  Z2$1 += z * 3;
  centroidPoint$1(x0$3 = x, y0$3 = y);
}

function PathContext(context) {
  this._context = context;
}

PathContext.prototype = {
  _radius: 4.5,
  pointRadius: function pointRadius(_) {
    return this._radius = _, this;
  },
  polygonStart: function polygonStart() {
    this._line = 0;
  },
  polygonEnd: function polygonEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line === 0) this._context.closePath();
    this._point = NaN;
  },
  point: function point(x, y) {
    switch (this._point) {
      case 0:
        {
          this._context.moveTo(x, y);
          this._point = 1;
          break;
        }
      case 1:
        {
          this._context.lineTo(x, y);
          break;
        }
      default:
        {
          this._context.moveTo(x + this._radius, y);
          this._context.arc(x, y, this._radius, 0, tau$4);
          break;
        }
    }
  },
  result: noop$2
};

function PathString() {
  this._string = [];
}

PathString.prototype = {
  _circle: circle$2(4.5),
  pointRadius: function pointRadius(_) {
    return this._circle = circle$2(_), this;
  },
  polygonStart: function polygonStart() {
    this._line = 0;
  },
  polygonEnd: function polygonEnd() {
    this._line = NaN;
  },
  lineStart: function lineStart() {
    this._point = 0;
  },
  lineEnd: function lineEnd() {
    if (this._line === 0) this._string.push("Z");
    this._point = NaN;
  },
  point: function point(x, y) {
    switch (this._point) {
      case 0:
        {
          this._string.push("M", x, ",", y);
          this._point = 1;
          break;
        }
      case 1:
        {
          this._string.push("L", x, ",", y);
          break;
        }
      default:
        {
          this._string.push("M", x, ",", y, this._circle);
          break;
        }
    }
  },
  result: function result() {
    if (this._string.length) {
      var result = this._string.join("");
      this._string = [];
      return result;
    }
  }
};

function circle$2(radius) {
  return "m0," + radius + "a" + radius + "," + radius + " 0 1,1 0," + -2 * radius + "a" + radius + "," + radius + " 0 1,1 0," + 2 * radius + "z";
}

var index$2 = function (projection, context) {
  var pointRadius = 4.5,
      projectionStream,
      contextStream;

  function path(object) {
    if (object) {
      if (typeof pointRadius === "function") contextStream.pointRadius(+pointRadius.apply(this, arguments));
      geoStream(object, projectionStream(contextStream));
    }
    return contextStream.result();
  }

  path.area = function (object) {
    geoStream(object, projectionStream(areaStream$1));
    return areaStream$1.result();
  };

  path.bounds = function (object) {
    geoStream(object, projectionStream(boundsStream$1));
    return boundsStream$1.result();
  };

  path.centroid = function (object) {
    geoStream(object, projectionStream(centroidStream$1));
    return centroidStream$1.result();
  };

  path.projection = function (_) {
    return arguments.length ? (projectionStream = _ == null ? (projection = null, identity$7) : (projection = _).stream, path) : projection;
  };

  path.context = function (_) {
    if (!arguments.length) return context;
    contextStream = _ == null ? (context = null, new PathString()) : new PathContext(context = _);
    if (typeof pointRadius !== "function") contextStream.pointRadius(pointRadius);
    return path;
  };

  path.pointRadius = function (_) {
    if (!arguments.length) return pointRadius;
    pointRadius = typeof _ === "function" ? _ : (contextStream.pointRadius(+_), +_);
    return path;
  };

  return path.projection(projection).context(context);
};

var sum$2 = adder();

var polygonContains = function (polygon, point) {
  var lambda = point[0],
      phi = point[1],
      normal = [sin$1(lambda), -cos$1(lambda), 0],
      angle = 0,
      winding = 0;

  sum$2.reset();

  for (var i = 0, n = polygon.length; i < n; ++i) {
    if (!(m = (ring = polygon[i]).length)) continue;
    var ring,
        m,
        point0 = ring[m - 1],
        lambda0 = point0[0],
        phi0 = point0[1] / 2 + quarterPi,
        sinPhi0 = sin$1(phi0),
        cosPhi0 = cos$1(phi0);

    for (var j = 0; j < m; ++j, lambda0 = lambda1, sinPhi0 = sinPhi1, cosPhi0 = cosPhi1, point0 = point1) {
      var point1 = ring[j],
          lambda1 = point1[0],
          phi1 = point1[1] / 2 + quarterPi,
          sinPhi1 = sin$1(phi1),
          cosPhi1 = cos$1(phi1),
          delta = lambda1 - lambda0,
          sign$$1 = delta >= 0 ? 1 : -1,
          absDelta = sign$$1 * delta,
          antimeridian = absDelta > pi$4,
          k = sinPhi0 * sinPhi1;

      sum$2.add(atan2(k * sign$$1 * sin$1(absDelta), cosPhi0 * cosPhi1 + k * cos$1(absDelta)));
      angle += antimeridian ? delta + sign$$1 * tau$4 : delta;

      // Are the longitudes either side of the point’s meridian (lambda),
      // and are the latitudes smaller than the parallel (phi)?
      if (antimeridian ^ lambda0 >= lambda ^ lambda1 >= lambda) {
        var arc = cartesianCross(cartesian(point0), cartesian(point1));
        cartesianNormalizeInPlace(arc);
        var intersection = cartesianCross(normal, arc);
        cartesianNormalizeInPlace(intersection);
        var phiArc = (antimeridian ^ delta >= 0 ? -1 : 1) * asin$1(intersection[2]);
        if (phi > phiArc || phi === phiArc && (arc[0] || arc[1])) {
          winding += antimeridian ^ delta >= 0 ? 1 : -1;
        }
      }
    }
  }

  // First, determine whether the South pole is inside or outside:
  //
  // It is inside if:
  // * the polygon winds around it in a clockwise direction.
  // * the polygon does not (cumulatively) wind around it, but has a negative
  //   (counter-clockwise) area.
  //
  // Second, count the (signed) number of times a segment crosses a lambda
  // from the point to the South pole.  If it is zero, then the point is the
  // same side as the South pole.

  return (angle < -epsilon$4 || angle < epsilon$4 && sum$2 < -epsilon$4) ^ winding & 1;
};

var clip = function (pointVisible, clipLine, interpolate, start) {
  return function (rotate, sink) {
    var line = clipLine(sink),
        rotatedStart = rotate.invert(start[0], start[1]),
        ringBuffer = clipBuffer(),
        ringSink = clipLine(ringBuffer),
        polygonStarted = false,
        polygon,
        segments,
        ring;

    var clip = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: function polygonStart() {
        clip.point = pointRing;
        clip.lineStart = ringStart;
        clip.lineEnd = ringEnd;
        segments = [];
        polygon = [];
      },
      polygonEnd: function polygonEnd() {
        clip.point = point;
        clip.lineStart = lineStart;
        clip.lineEnd = lineEnd;
        segments = merge(segments);
        var startInside = polygonContains(polygon, rotatedStart);
        if (segments.length) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          clipPolygon(segments, compareIntersection, startInside, interpolate, sink);
        } else if (startInside) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          sink.lineStart();
          interpolate(null, null, 1, sink);
          sink.lineEnd();
        }
        if (polygonStarted) sink.polygonEnd(), polygonStarted = false;
        segments = polygon = null;
      },
      sphere: function sphere() {
        sink.polygonStart();
        sink.lineStart();
        interpolate(null, null, 1, sink);
        sink.lineEnd();
        sink.polygonEnd();
      }
    };

    function point(lambda, phi) {
      var point = rotate(lambda, phi);
      if (pointVisible(lambda = point[0], phi = point[1])) sink.point(lambda, phi);
    }

    function pointLine(lambda, phi) {
      var point = rotate(lambda, phi);
      line.point(point[0], point[1]);
    }

    function lineStart() {
      clip.point = pointLine;
      line.lineStart();
    }

    function lineEnd() {
      clip.point = point;
      line.lineEnd();
    }

    function pointRing(lambda, phi) {
      ring.push([lambda, phi]);
      var point = rotate(lambda, phi);
      ringSink.point(point[0], point[1]);
    }

    function ringStart() {
      ringSink.lineStart();
      ring = [];
    }

    function ringEnd() {
      pointRing(ring[0][0], ring[0][1]);
      ringSink.lineEnd();

      var clean = ringSink.clean(),
          ringSegments = ringBuffer.result(),
          i,
          n = ringSegments.length,
          m,
          segment,
          point;

      ring.pop();
      polygon.push(ring);
      ring = null;

      if (!n) return;

      // No intersections.
      if (clean & 1) {
        segment = ringSegments[0];
        if ((m = segment.length - 1) > 0) {
          if (!polygonStarted) sink.polygonStart(), polygonStarted = true;
          sink.lineStart();
          for (i = 0; i < m; ++i) {
            sink.point((point = segment[i])[0], point[1]);
          }sink.lineEnd();
        }
        return;
      }

      // Rejoin connected segments.
      // TODO reuse ringBuffer.rejoin()?
      if (n > 1 && clean & 2) ringSegments.push(ringSegments.pop().concat(ringSegments.shift()));

      segments.push(ringSegments.filter(validSegment));
    }

    return clip;
  };
};

function validSegment(segment) {
  return segment.length > 1;
}

// Intersections are sorted along the clip edge. For both antimeridian cutting
// and circle clipping, the same comparison is used.
function compareIntersection(a, b) {
  return ((a = a.x)[0] < 0 ? a[1] - halfPi$3 - epsilon$4 : halfPi$3 - a[1]) - ((b = b.x)[0] < 0 ? b[1] - halfPi$3 - epsilon$4 : halfPi$3 - b[1]);
}

var clipAntimeridian = clip(function () {
  return true;
}, clipAntimeridianLine, clipAntimeridianInterpolate, [-pi$4, -halfPi$3]);

// Takes a line and cuts into visible segments. Return values: 0 - there were
// intersections or the line was empty; 1 - no intersections; 2 - there were
// intersections, and the first and last segments should be rejoined.
function clipAntimeridianLine(stream) {
  var lambda0 = NaN,
      phi0 = NaN,
      sign0 = NaN,
      _clean; // no intersections

  return {
    lineStart: function lineStart() {
      stream.lineStart();
      _clean = 1;
    },
    point: function point(lambda1, phi1) {
      var sign1 = lambda1 > 0 ? pi$4 : -pi$4,
          delta = abs(lambda1 - lambda0);
      if (abs(delta - pi$4) < epsilon$4) {
        // line crosses a pole
        stream.point(lambda0, phi0 = (phi0 + phi1) / 2 > 0 ? halfPi$3 : -halfPi$3);
        stream.point(sign0, phi0);
        stream.lineEnd();
        stream.lineStart();
        stream.point(sign1, phi0);
        stream.point(lambda1, phi0);
        _clean = 0;
      } else if (sign0 !== sign1 && delta >= pi$4) {
        // line crosses antimeridian
        if (abs(lambda0 - sign0) < epsilon$4) lambda0 -= sign0 * epsilon$4; // handle degeneracies
        if (abs(lambda1 - sign1) < epsilon$4) lambda1 -= sign1 * epsilon$4;
        phi0 = clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1);
        stream.point(sign0, phi0);
        stream.lineEnd();
        stream.lineStart();
        stream.point(sign1, phi0);
        _clean = 0;
      }
      stream.point(lambda0 = lambda1, phi0 = phi1);
      sign0 = sign1;
    },
    lineEnd: function lineEnd() {
      stream.lineEnd();
      lambda0 = phi0 = NaN;
    },
    clean: function clean() {
      return 2 - _clean; // if intersections, rejoin first and last segments
    }
  };
}

function clipAntimeridianIntersect(lambda0, phi0, lambda1, phi1) {
  var cosPhi0,
      cosPhi1,
      sinLambda0Lambda1 = sin$1(lambda0 - lambda1);
  return abs(sinLambda0Lambda1) > epsilon$4 ? atan((sin$1(phi0) * (cosPhi1 = cos$1(phi1)) * sin$1(lambda1) - sin$1(phi1) * (cosPhi0 = cos$1(phi0)) * sin$1(lambda0)) / (cosPhi0 * cosPhi1 * sinLambda0Lambda1)) : (phi0 + phi1) / 2;
}

function clipAntimeridianInterpolate(from, to, direction, stream) {
  var phi;
  if (from == null) {
    phi = direction * halfPi$3;
    stream.point(-pi$4, phi);
    stream.point(0, phi);
    stream.point(pi$4, phi);
    stream.point(pi$4, 0);
    stream.point(pi$4, -phi);
    stream.point(0, -phi);
    stream.point(-pi$4, -phi);
    stream.point(-pi$4, 0);
    stream.point(-pi$4, phi);
  } else if (abs(from[0] - to[0]) > epsilon$4) {
    var lambda = from[0] < to[0] ? pi$4 : -pi$4;
    phi = direction * lambda / 2;
    stream.point(-lambda, phi);
    stream.point(0, phi);
    stream.point(lambda, phi);
  } else {
    stream.point(to[0], to[1]);
  }
}

var clipCircle = function (radius, delta) {
  var cr = cos$1(radius),
      smallRadius = cr > 0,
      notHemisphere = abs(cr) > epsilon$4; // TODO optimise for this common case

  function interpolate(from, to, direction, stream) {
    circleStream(stream, radius, delta, direction, from, to);
  }

  function visible(lambda, phi) {
    return cos$1(lambda) * cos$1(phi) > cr;
  }

  // Takes a line and cuts into visible segments. Return values used for polygon
  // clipping: 0 - there were intersections or the line was empty; 1 - no
  // intersections 2 - there were intersections, and the first and last segments
  // should be rejoined.
  function clipLine(stream) {
    var point0, // previous point
    c0, // code for previous point
    v0, // visibility of previous point
    v00, // visibility of first point
    _clean; // no intersections
    return {
      lineStart: function lineStart() {
        v00 = v0 = false;
        _clean = 1;
      },
      point: function point(lambda, phi) {
        var point1 = [lambda, phi],
            point2,
            v = visible(lambda, phi),
            c = smallRadius ? v ? 0 : code(lambda, phi) : v ? code(lambda + (lambda < 0 ? pi$4 : -pi$4), phi) : 0;
        if (!point0 && (v00 = v0 = v)) stream.lineStart();
        // Handle degeneracies.
        // TODO ignore if not clipping polygons.
        if (v !== v0) {
          point2 = intersect(point0, point1);
          if (pointEqual(point0, point2) || pointEqual(point1, point2)) {
            point1[0] += epsilon$4;
            point1[1] += epsilon$4;
            v = visible(point1[0], point1[1]);
          }
        }
        if (v !== v0) {
          _clean = 0;
          if (v) {
            // outside going in
            stream.lineStart();
            point2 = intersect(point1, point0);
            stream.point(point2[0], point2[1]);
          } else {
            // inside going out
            point2 = intersect(point0, point1);
            stream.point(point2[0], point2[1]);
            stream.lineEnd();
          }
          point0 = point2;
        } else if (notHemisphere && point0 && smallRadius ^ v) {
          var t;
          // If the codes for two points are different, or are both zero,
          // and there this segment intersects with the small circle.
          if (!(c & c0) && (t = intersect(point1, point0, true))) {
            _clean = 0;
            if (smallRadius) {
              stream.lineStart();
              stream.point(t[0][0], t[0][1]);
              stream.point(t[1][0], t[1][1]);
              stream.lineEnd();
            } else {
              stream.point(t[1][0], t[1][1]);
              stream.lineEnd();
              stream.lineStart();
              stream.point(t[0][0], t[0][1]);
            }
          }
        }
        if (v && (!point0 || !pointEqual(point0, point1))) {
          stream.point(point1[0], point1[1]);
        }
        point0 = point1, v0 = v, c0 = c;
      },
      lineEnd: function lineEnd() {
        if (v0) stream.lineEnd();
        point0 = null;
      },
      // Rejoin first and last segments if there were intersections and the first
      // and last points were visible.
      clean: function clean() {
        return _clean | (v00 && v0) << 1;
      }
    };
  }

  // Intersects the great circle between a and b with the clip circle.
  function intersect(a, b, two) {
    var pa = cartesian(a),
        pb = cartesian(b);

    // We have two planes, n1.p = d1 and n2.p = d2.
    // Find intersection line p(t) = c1 n1 + c2 n2 + t (n1 ⨯ n2).
    var n1 = [1, 0, 0],
        // normal
    n2 = cartesianCross(pa, pb),
        n2n2 = cartesianDot(n2, n2),
        n1n2 = n2[0],
        // cartesianDot(n1, n2),
    determinant = n2n2 - n1n2 * n1n2;

    // Two polar points.
    if (!determinant) return !two && a;

    var c1 = cr * n2n2 / determinant,
        c2 = -cr * n1n2 / determinant,
        n1xn2 = cartesianCross(n1, n2),
        A = cartesianScale(n1, c1),
        B = cartesianScale(n2, c2);
    cartesianAddInPlace(A, B);

    // Solve |p(t)|^2 = 1.
    var u = n1xn2,
        w = cartesianDot(A, u),
        uu = cartesianDot(u, u),
        t2 = w * w - uu * (cartesianDot(A, A) - 1);

    if (t2 < 0) return;

    var t = sqrt$1(t2),
        q = cartesianScale(u, (-w - t) / uu);
    cartesianAddInPlace(q, A);
    q = spherical(q);

    if (!two) return q;

    // Two intersection points.
    var lambda0 = a[0],
        lambda1 = b[0],
        phi0 = a[1],
        phi1 = b[1],
        z;

    if (lambda1 < lambda0) z = lambda0, lambda0 = lambda1, lambda1 = z;

    var delta = lambda1 - lambda0,
        polar = abs(delta - pi$4) < epsilon$4,
        meridian = polar || delta < epsilon$4;

    if (!polar && phi1 < phi0) z = phi0, phi0 = phi1, phi1 = z;

    // Check that the first point is between a and b.
    if (meridian ? polar ? phi0 + phi1 > 0 ^ q[1] < (abs(q[0] - lambda0) < epsilon$4 ? phi0 : phi1) : phi0 <= q[1] && q[1] <= phi1 : delta > pi$4 ^ (lambda0 <= q[0] && q[0] <= lambda1)) {
      var q1 = cartesianScale(u, (-w + t) / uu);
      cartesianAddInPlace(q1, A);
      return [q, spherical(q1)];
    }
  }

  // Generates a 4-bit vector representing the location of a point relative to
  // the small circle's bounding box.
  function code(lambda, phi) {
    var r = smallRadius ? radius : pi$4 - radius,
        code = 0;
    if (lambda < -r) code |= 1; // left
    else if (lambda > r) code |= 2; // right
    if (phi < -r) code |= 4; // below
    else if (phi > r) code |= 8; // above
    return code;
  }

  return clip(visible, clipLine, interpolate, smallRadius ? [0, -radius] : [-pi$4, radius - pi$4]);
};

var transform$1 = function (methods) {
  return {
    stream: transformer(methods)
  };
};

function transformer(methods) {
  return function (stream) {
    var s = new TransformStream();
    for (var key in methods) {
      s[key] = methods[key];
    }s.stream = stream;
    return s;
  };
}

function TransformStream() {}

TransformStream.prototype = {
  constructor: TransformStream,
  point: function point(x, y) {
    this.stream.point(x, y);
  },
  sphere: function sphere() {
    this.stream.sphere();
  },
  lineStart: function lineStart() {
    this.stream.lineStart();
  },
  lineEnd: function lineEnd() {
    this.stream.lineEnd();
  },
  polygonStart: function polygonStart() {
    this.stream.polygonStart();
  },
  polygonEnd: function polygonEnd() {
    this.stream.polygonEnd();
  }
};

function fitExtent$1(projection, extent, object) {
    var w = extent[1][0] - extent[0][0],
        h = extent[1][1] - extent[0][1],
        clip = projection.clipExtent && projection.clipExtent();

    projection.scale(150).translate([0, 0]);

    if (clip != null) projection.clipExtent(null);

    geoStream(object, projection.stream(boundsStream$1));

    var b = boundsStream$1.result(),
        k = Math.min(w / (b[1][0] - b[0][0]), h / (b[1][1] - b[0][1])),
        x = +extent[0][0] + (w - k * (b[1][0] + b[0][0])) / 2,
        y = +extent[0][1] + (h - k * (b[1][1] + b[0][1])) / 2;

    if (clip != null) projection.clipExtent(clip);

    return projection.scale(k * 150).translate([x, y]);
}

function fitSize$1(projection, size, object) {
    return fitExtent$1(projection, [[0, 0], size], object);
}

var maxDepth = 16;
var cosMinDistance = cos$1(30 * radians); // cos(minimum angular distance)

var resample = function (project, delta2) {
  return +delta2 ? resample$1(project, delta2) : resampleNone(project);
};

function resampleNone(project) {
  return transformer({
    point: function point(x, y) {
      x = project(x, y);
      this.stream.point(x[0], x[1]);
    }
  });
}

function resample$1(project, delta2) {

  function resampleLineTo(x0, y0, lambda0, a0, b0, c0, x1, y1, lambda1, a1, b1, c1, depth, stream) {
    var dx = x1 - x0,
        dy = y1 - y0,
        d2 = dx * dx + dy * dy;
    if (d2 > 4 * delta2 && depth--) {
      var a = a0 + a1,
          b = b0 + b1,
          c = c0 + c1,
          m = sqrt$1(a * a + b * b + c * c),
          phi2 = asin$1(c /= m),
          lambda2 = abs(abs(c) - 1) < epsilon$4 || abs(lambda0 - lambda1) < epsilon$4 ? (lambda0 + lambda1) / 2 : atan2(b, a),
          p = project(lambda2, phi2),
          x2 = p[0],
          y2 = p[1],
          dx2 = x2 - x0,
          dy2 = y2 - y0,
          dz = dy * dx2 - dx * dy2;
      if (dz * dz / d2 > delta2 // perpendicular projected distance
      || abs((dx * dx2 + dy * dy2) / d2 - 0.5) > 0.3 // midpoint close to an end
      || a0 * a1 + b0 * b1 + c0 * c1 < cosMinDistance) {
        // angular distance
        resampleLineTo(x0, y0, lambda0, a0, b0, c0, x2, y2, lambda2, a /= m, b /= m, c, depth, stream);
        stream.point(x2, y2);
        resampleLineTo(x2, y2, lambda2, a, b, c, x1, y1, lambda1, a1, b1, c1, depth, stream);
      }
    }
  }
  return function (stream) {
    var lambda00, x00, y00, a00, b00, c00, // first point
    lambda0, x0, y0, a0, b0, c0; // previous point

    var resampleStream = {
      point: point,
      lineStart: lineStart,
      lineEnd: lineEnd,
      polygonStart: function polygonStart() {
        stream.polygonStart();resampleStream.lineStart = ringStart;
      },
      polygonEnd: function polygonEnd() {
        stream.polygonEnd();resampleStream.lineStart = lineStart;
      }
    };

    function point(x, y) {
      x = project(x, y);
      stream.point(x[0], x[1]);
    }

    function lineStart() {
      x0 = NaN;
      resampleStream.point = linePoint;
      stream.lineStart();
    }

    function linePoint(lambda, phi) {
      var c = cartesian([lambda, phi]),
          p = project(lambda, phi);
      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x0 = p[0], y0 = p[1], lambda0 = lambda, a0 = c[0], b0 = c[1], c0 = c[2], maxDepth, stream);
      stream.point(x0, y0);
    }

    function lineEnd() {
      resampleStream.point = point;
      stream.lineEnd();
    }

    function ringStart() {
      lineStart();
      resampleStream.point = ringPoint;
      resampleStream.lineEnd = ringEnd;
    }

    function ringPoint(lambda, phi) {
      linePoint(lambda00 = lambda, phi), x00 = x0, y00 = y0, a00 = a0, b00 = b0, c00 = c0;
      resampleStream.point = linePoint;
    }

    function ringEnd() {
      resampleLineTo(x0, y0, lambda0, a0, b0, c0, x00, y00, lambda00, a00, b00, c00, maxDepth, stream);
      resampleStream.lineEnd = lineEnd;
      lineEnd();
    }

    return resampleStream;
  };
}

var transformRadians = transformer({
  point: function point(x, y) {
    this.stream.point(x * radians, y * radians);
  }
});

function projection(project) {
  return projectionMutator(function () {
    return project;
  })();
}

function projectionMutator(projectAt) {
  var project,
      k = 150,
      // scale
  x = 480,
      y = 250,
      // translate
  dx,
      dy,
      lambda = 0,
      phi = 0,
      // center
  deltaLambda = 0,
      deltaPhi = 0,
      deltaGamma = 0,
      rotate,
      projectRotate,
      // rotate
  theta = null,
      preclip = clipAntimeridian,
      // clip angle
  x0 = null,
      y0,
      x1,
      y1,
      postclip = identity$7,
      // clip extent
  delta2 = 0.5,
      projectResample = resample(projectTransform, delta2),
      // precision
  cache,
      cacheStream;

  function projection(point) {
    point = projectRotate(point[0] * radians, point[1] * radians);
    return [point[0] * k + dx, dy - point[1] * k];
  }

  function invert(point) {
    point = projectRotate.invert((point[0] - dx) / k, (dy - point[1]) / k);
    return point && [point[0] * degrees$1, point[1] * degrees$1];
  }

  function projectTransform(x, y) {
    return x = project(x, y), [x[0] * k + dx, dy - x[1] * k];
  }

  projection.stream = function (stream) {
    return cache && cacheStream === stream ? cache : cache = transformRadians(preclip(rotate, projectResample(postclip(cacheStream = stream))));
  };

  projection.clipAngle = function (_) {
    return arguments.length ? (preclip = +_ ? clipCircle(theta = _ * radians, 6 * radians) : (theta = null, clipAntimeridian), reset()) : theta * degrees$1;
  };

  projection.clipExtent = function (_) {
    return arguments.length ? (postclip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$7) : clipExtent$1(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
  };

  projection.scale = function (_) {
    return arguments.length ? (k = +_, recenter()) : k;
  };

  projection.translate = function (_) {
    return arguments.length ? (x = +_[0], y = +_[1], recenter()) : [x, y];
  };

  projection.center = function (_) {
    return arguments.length ? (lambda = _[0] % 360 * radians, phi = _[1] % 360 * radians, recenter()) : [lambda * degrees$1, phi * degrees$1];
  };

  projection.rotate = function (_) {
    return arguments.length ? (deltaLambda = _[0] % 360 * radians, deltaPhi = _[1] % 360 * radians, deltaGamma = _.length > 2 ? _[2] % 360 * radians : 0, recenter()) : [deltaLambda * degrees$1, deltaPhi * degrees$1, deltaGamma * degrees$1];
  };

  projection.precision = function (_) {
    return arguments.length ? (projectResample = resample(projectTransform, delta2 = _ * _), reset()) : sqrt$1(delta2);
  };

  projection.fitExtent = function (extent, object) {
    return fitExtent$1(projection, extent, object);
  };

  projection.fitSize = function (size, object) {
    return fitSize$1(projection, size, object);
  };

  function recenter() {
    projectRotate = compose(rotate = rotateRadians(deltaLambda, deltaPhi, deltaGamma), project);
    var center = project(lambda, phi);
    dx = x - center[0] * k;
    dy = y + center[1] * k;
    return reset();
  }

  function reset() {
    cache = cacheStream = null;
    return projection;
  }

  return function () {
    project = projectAt.apply(this, arguments);
    projection.invert = project.invert && invert;
    return recenter();
  };
}

function conicProjection(projectAt) {
  var phi0 = 0,
      phi1 = pi$4 / 3,
      m = projectionMutator(projectAt),
      p = m(phi0, phi1);

  p.parallels = function (_) {
    return arguments.length ? m(phi0 = _[0] * radians, phi1 = _[1] * radians) : [phi0 * degrees$1, phi1 * degrees$1];
  };

  return p;
}

function cylindricalEqualAreaRaw(phi0) {
  var cosPhi0 = cos$1(phi0);

  function forward(lambda, phi) {
    return [lambda * cosPhi0, sin$1(phi) / cosPhi0];
  }

  forward.invert = function (x, y) {
    return [x / cosPhi0, asin$1(y * cosPhi0)];
  };

  return forward;
}

function conicEqualAreaRaw(y0, y1) {
  var sy0 = sin$1(y0),
      n = (sy0 + sin$1(y1)) / 2;

  // Are the parallels symmetrical around the Equator?
  if (abs(n) < epsilon$4) return cylindricalEqualAreaRaw(y0);

  var c = 1 + sy0 * (2 * n - sy0),
      r0 = sqrt$1(c) / n;

  function project(x, y) {
    var r = sqrt$1(c - 2 * n * sin$1(y)) / n;
    return [r * sin$1(x *= n), r0 - r * cos$1(x)];
  }

  project.invert = function (x, y) {
    var r0y = r0 - y;
    return [atan2(x, abs(r0y)) / n * sign$1(r0y), asin$1((c - (x * x + r0y * r0y) * n * n) / (2 * n))];
  };

  return project;
}

var conicEqualArea = function () {
  return conicProjection(conicEqualAreaRaw).scale(155.424).center([0, 33.6442]);
};

var albers = function () {
    return conicEqualArea().parallels([29.5, 45.5]).scale(1070).translate([480, 250]).rotate([96, 0]).center([-0.6, 38.7]);
};

// The projections must have mutually exclusive clip regions on the sphere,
// as this will avoid emitting interleaving lines and polygons.
function multiplex(streams) {
  var n = streams.length;
  return {
    point: function point(x, y) {
      var i = -1;while (++i < n) {
        streams[i].point(x, y);
      }
    },
    sphere: function sphere() {
      var i = -1;while (++i < n) {
        streams[i].sphere();
      }
    },
    lineStart: function lineStart() {
      var i = -1;while (++i < n) {
        streams[i].lineStart();
      }
    },
    lineEnd: function lineEnd() {
      var i = -1;while (++i < n) {
        streams[i].lineEnd();
      }
    },
    polygonStart: function polygonStart() {
      var i = -1;while (++i < n) {
        streams[i].polygonStart();
      }
    },
    polygonEnd: function polygonEnd() {
      var i = -1;while (++i < n) {
        streams[i].polygonEnd();
      }
    }
  };
}

// A composite projection for the United States, configured by default for
// 960×500. The projection also works quite well at 960×600 if you change the
// scale to 1285 and adjust the translate accordingly. The set of standard
// parallels for each region comes from USGS, which is published here:
// http://egsc.usgs.gov/isb/pubs/MapProjections/projections.html#albers
var albersUsa = function () {
  var cache,
      cacheStream,
      lower48 = albers(),
      lower48Point,
      alaska = conicEqualArea().rotate([154, 0]).center([-2, 58.5]).parallels([55, 65]),
      alaskaPoint,
      // EPSG:3338
  hawaii = conicEqualArea().rotate([157, 0]).center([-3, 19.9]).parallels([8, 18]),
      hawaiiPoint,
      // ESRI:102007
  _point,
      pointStream = { point: function point(x, y) {
      _point = [x, y];
    } };

  function albersUsa(coordinates) {
    var x = coordinates[0],
        y = coordinates[1];
    return _point = null, (lower48Point.point(x, y), _point) || (alaskaPoint.point(x, y), _point) || (hawaiiPoint.point(x, y), _point);
  }

  albersUsa.invert = function (coordinates) {
    var k = lower48.scale(),
        t = lower48.translate(),
        x = (coordinates[0] - t[0]) / k,
        y = (coordinates[1] - t[1]) / k;
    return (y >= 0.120 && y < 0.234 && x >= -0.425 && x < -0.214 ? alaska : y >= 0.166 && y < 0.234 && x >= -0.214 && x < -0.115 ? hawaii : lower48).invert(coordinates);
  };

  albersUsa.stream = function (stream) {
    return cache && cacheStream === stream ? cache : cache = multiplex([lower48.stream(cacheStream = stream), alaska.stream(stream), hawaii.stream(stream)]);
  };

  albersUsa.precision = function (_) {
    if (!arguments.length) return lower48.precision();
    lower48.precision(_), alaska.precision(_), hawaii.precision(_);
    return reset();
  };

  albersUsa.scale = function (_) {
    if (!arguments.length) return lower48.scale();
    lower48.scale(_), alaska.scale(_ * 0.35), hawaii.scale(_);
    return albersUsa.translate(lower48.translate());
  };

  albersUsa.translate = function (_) {
    if (!arguments.length) return lower48.translate();
    var k = lower48.scale(),
        x = +_[0],
        y = +_[1];

    lower48Point = lower48.translate(_).clipExtent([[x - 0.455 * k, y - 0.238 * k], [x + 0.455 * k, y + 0.238 * k]]).stream(pointStream);

    alaskaPoint = alaska.translate([x - 0.307 * k, y + 0.201 * k]).clipExtent([[x - 0.425 * k + epsilon$4, y + 0.120 * k + epsilon$4], [x - 0.214 * k - epsilon$4, y + 0.234 * k - epsilon$4]]).stream(pointStream);

    hawaiiPoint = hawaii.translate([x - 0.205 * k, y + 0.212 * k]).clipExtent([[x - 0.214 * k + epsilon$4, y + 0.166 * k + epsilon$4], [x - 0.115 * k - epsilon$4, y + 0.234 * k - epsilon$4]]).stream(pointStream);

    return reset();
  };

  albersUsa.fitExtent = function (extent, object) {
    return fitExtent$1(albersUsa, extent, object);
  };

  albersUsa.fitSize = function (size, object) {
    return fitSize$1(albersUsa, size, object);
  };

  function reset() {
    cache = cacheStream = null;
    return albersUsa;
  }

  return albersUsa.scale(1070);
};

function azimuthalRaw(scale) {
  return function (x, y) {
    var cx = cos$1(x),
        cy = cos$1(y),
        k = scale(cx * cy);
    return [k * cy * sin$1(x), k * sin$1(y)];
  };
}

function azimuthalInvert(angle) {
  return function (x, y) {
    var z = sqrt$1(x * x + y * y),
        c = angle(z),
        sc = sin$1(c),
        cc = cos$1(c);
    return [atan2(x * sc, z * cc), asin$1(z && y * sc / z)];
  };
}

var azimuthalEqualAreaRaw = azimuthalRaw(function (cxcy) {
  return sqrt$1(2 / (1 + cxcy));
});

azimuthalEqualAreaRaw.invert = azimuthalInvert(function (z) {
  return 2 * asin$1(z / 2);
});

var azimuthalEqualArea = function () {
  return projection(azimuthalEqualAreaRaw).scale(124.75).clipAngle(180 - 1e-3);
};

var azimuthalEquidistantRaw = azimuthalRaw(function (c) {
  return (c = acos(c)) && c / sin$1(c);
});

azimuthalEquidistantRaw.invert = azimuthalInvert(function (z) {
  return z;
});

var azimuthalEquidistant = function () {
  return projection(azimuthalEquidistantRaw).scale(79.4188).clipAngle(180 - 1e-3);
};

function mercatorRaw(lambda, phi) {
  return [lambda, log$1(tan((halfPi$3 + phi) / 2))];
}

mercatorRaw.invert = function (x, y) {
  return [x, 2 * atan(exp(y)) - halfPi$3];
};

var mercator = function () {
  return mercatorProjection(mercatorRaw).scale(961 / tau$4);
};

function mercatorProjection(project) {
  var m = projection(project),
      scale = m.scale,
      translate = m.translate,
      clipExtent = m.clipExtent,
      clipAuto;

  m.scale = function (_) {
    return arguments.length ? (scale(_), clipAuto && m.clipExtent(null), m) : scale();
  };

  m.translate = function (_) {
    return arguments.length ? (translate(_), clipAuto && m.clipExtent(null), m) : translate();
  };

  m.clipExtent = function (_) {
    if (!arguments.length) return clipAuto ? null : clipExtent();
    if (clipAuto = _ == null) {
      var k = pi$4 * scale(),
          t = translate();
      _ = [[t[0] - k, t[1] - k], [t[0] + k, t[1] + k]];
    }
    clipExtent(_);
    return m;
  };

  return m.clipExtent(null);
}

function tany(y) {
  return tan((halfPi$3 + y) / 2);
}

function conicConformalRaw(y0, y1) {
  var cy0 = cos$1(y0),
      n = y0 === y1 ? sin$1(y0) : log$1(cy0 / cos$1(y1)) / log$1(tany(y1) / tany(y0)),
      f = cy0 * pow$1(tany(y0), n) / n;

  if (!n) return mercatorRaw;

  function project(x, y) {
    if (f > 0) {
      if (y < -halfPi$3 + epsilon$4) y = -halfPi$3 + epsilon$4;
    } else {
      if (y > halfPi$3 - epsilon$4) y = halfPi$3 - epsilon$4;
    }
    var r = f / pow$1(tany(y), n);
    return [r * sin$1(n * x), f - r * cos$1(n * x)];
  }

  project.invert = function (x, y) {
    var fy = f - y,
        r = sign$1(n) * sqrt$1(x * x + fy * fy);
    return [atan2(x, abs(fy)) / n * sign$1(fy), 2 * atan(pow$1(f / r, 1 / n)) - halfPi$3];
  };

  return project;
}

var conicConformal = function () {
  return conicProjection(conicConformalRaw).scale(109.5).parallels([30, 30]);
};

function equirectangularRaw(lambda, phi) {
  return [lambda, phi];
}

equirectangularRaw.invert = equirectangularRaw;

var equirectangular = function () {
  return projection(equirectangularRaw).scale(152.63);
};

function conicEquidistantRaw(y0, y1) {
  var cy0 = cos$1(y0),
      n = y0 === y1 ? sin$1(y0) : (cy0 - cos$1(y1)) / (y1 - y0),
      g = cy0 / n + y0;

  if (abs(n) < epsilon$4) return equirectangularRaw;

  function project(x, y) {
    var gy = g - y,
        nx = n * x;
    return [gy * sin$1(nx), g - gy * cos$1(nx)];
  }

  project.invert = function (x, y) {
    var gy = g - y;
    return [atan2(x, abs(gy)) / n * sign$1(gy), g - sign$1(n) * sqrt$1(x * x + gy * gy)];
  };

  return project;
}

var conicEquidistant = function () {
  return conicProjection(conicEquidistantRaw).scale(131.154).center([0, 13.9389]);
};

function gnomonicRaw(x, y) {
  var cy = cos$1(y),
      k = cos$1(x) * cy;
  return [cy * sin$1(x) / k, sin$1(y) / k];
}

gnomonicRaw.invert = azimuthalInvert(atan);

var gnomonic = function () {
  return projection(gnomonicRaw).scale(144.049).clipAngle(60);
};

function scaleTranslate(kx, ky, tx, ty) {
  return kx === 1 && ky === 1 && tx === 0 && ty === 0 ? identity$7 : transformer({
    point: function point(x, y) {
      this.stream.point(x * kx + tx, y * ky + ty);
    }
  });
}

var identity$8 = function () {
  var k = 1,
      tx = 0,
      ty = 0,
      sx = 1,
      sy = 1,
      transform = identity$7,
      // scale, translate and reflect
  x0 = null,
      y0,
      x1,
      y1,
      clip = identity$7,
      // clip extent
  cache,
      cacheStream,
      projection;

  function reset() {
    cache = cacheStream = null;
    return projection;
  }

  return projection = {
    stream: function stream(_stream) {
      return cache && cacheStream === _stream ? cache : cache = transform(clip(cacheStream = _stream));
    },
    clipExtent: function clipExtent(_) {
      return arguments.length ? (clip = _ == null ? (x0 = y0 = x1 = y1 = null, identity$7) : clipExtent$1(x0 = +_[0][0], y0 = +_[0][1], x1 = +_[1][0], y1 = +_[1][1]), reset()) : x0 == null ? null : [[x0, y0], [x1, y1]];
    },
    scale: function scale(_) {
      return arguments.length ? (transform = scaleTranslate((k = +_) * sx, k * sy, tx, ty), reset()) : k;
    },
    translate: function translate(_) {
      return arguments.length ? (transform = scaleTranslate(k * sx, k * sy, tx = +_[0], ty = +_[1]), reset()) : [tx, ty];
    },
    reflectX: function reflectX(_) {
      return arguments.length ? (transform = scaleTranslate(k * (sx = _ ? -1 : 1), k * sy, tx, ty), reset()) : sx < 0;
    },
    reflectY: function reflectY(_) {
      return arguments.length ? (transform = scaleTranslate(k * sx, k * (sy = _ ? -1 : 1), tx, ty), reset()) : sy < 0;
    },
    fitExtent: function fitExtent(extent, object) {
      return fitExtent$1(projection, extent, object);
    },
    fitSize: function fitSize(size, object) {
      return fitSize$1(projection, size, object);
    }
  };
};

function orthographicRaw(x, y) {
  return [cos$1(y) * sin$1(x), sin$1(y)];
}

orthographicRaw.invert = azimuthalInvert(asin$1);

var orthographic = function () {
  return projection(orthographicRaw).scale(249.5).clipAngle(90 + epsilon$4);
};

function stereographicRaw(x, y) {
  var cy = cos$1(y),
      k = 1 + cos$1(x) * cy;
  return [cy * sin$1(x) / k, sin$1(y) / k];
}

stereographicRaw.invert = azimuthalInvert(function (z) {
  return 2 * atan(z);
});

var stereographic = function () {
  return projection(stereographicRaw).scale(250).clipAngle(142);
};

function transverseMercatorRaw(lambda, phi) {
  return [log$1(tan((halfPi$3 + phi) / 2)), -lambda];
}

transverseMercatorRaw.invert = function (x, y) {
  return [-y, 2 * atan(exp(x)) - halfPi$3];
};

var transverseMercator = function () {
  var m = mercatorProjection(transverseMercatorRaw),
      center = m.center,
      rotate = m.rotate;

  m.center = function (_) {
    return arguments.length ? center([-_[1], _[0]]) : (_ = center(), [_[1], -_[0]]);
  };

  m.rotate = function (_) {
    return arguments.length ? rotate([_[0], _[1], _.length > 2 ? _[2] + 90 : 90]) : (_ = rotate(), [_[0], _[1], _[2] - 90]);
  };

  return rotate([0, 0, 90]).scale(159.155);
};

var ostring = Object.prototype.toString;
var inBrowser = typeof window !== 'undefined' && ostring.call(window) !== '[object Object]';

var logger = inBrowser ? window.console : require('console');

// From https://github.com/sindresorhus/object-assign
// The MIT License (MIT)
//
// Copyright (c) Sindre Sorhus <sindresorhus@gmail.com> (sindresorhus.com)
var hasOwnProperty = Object.prototype.hasOwnProperty;
var propIsEnumerable = Object.prototype.propertyIsEnumerable;

var assign = assign$1();

function toObject(val) {
	if (val === null || val === undefined) {
		throw new TypeError('Object.assign cannot be called with null or undefined');
	}

	return Object(val);
}

function shouldUseNative() {
	try {
		if (!Object.assign) {
			return false;
		}

		// Detect buggy property enumeration order in older V8 versions.

		// https://bugs.chromium.org/p/v8/issues/detail?id=4118
		var test1 = new String('abc'); // eslint-disable-line no-new-wrappers
		test1[5] = 'de';
		if (Object.getOwnPropertyNames(test1)[0] === '5') {
			return false;
		}

		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
		var test2 = {};
		for (var i = 0; i < 10; i++) {
			test2['_' + String.fromCharCode(i)] = i;
		}
		var order2 = Object.getOwnPropertyNames(test2).map(function (n) {
			return test2[n];
		});
		if (order2.join('') !== '0123456789') {
			return false;
		}

		// https://bugs.chromium.org/p/v8/issues/detail?id=3056
		var test3 = {};
		'abcdefghijklmnopqrst'.split('').forEach(function (letter) {
			test3[letter] = letter;
		});
		if (Object.keys(Object.assign({}, test3)).join('') !== 'abcdefghijklmnopqrst') {
			return false;
		}

		return true;
	} catch (err) {
		// We don't expect any of the above to throw, but better to be safe.
		return false;
	}
}

function assign$1() {
	return shouldUseNative() ? Object.assign : function (target) {
		var from;
		var to = toObject(target);
		var symbols;

		for (var s = 1; s < arguments.length; s++) {
			from = Object(arguments[s]);

			for (var key in from) {
				if (hasOwnProperty.call(from, key)) {
					to[key] = from[key];
				}
			}

			if (Object.getOwnPropertySymbols) {
				symbols = Object.getOwnPropertySymbols(from);
				for (var i = 0; i < symbols.length; i++) {
					if (propIsEnumerable.call(from, symbols[i])) {
						to[symbols[i]] = from[symbols[i]];
					}
				}
			}
		}

		return to;
	};
}

// Simulate a WeekMap for now

function isObject(value) {
    return ostring.call(value) === '[object Object]';
}

function isString(value) {
    return ostring.call(value) === '[object String]';
}

function isFunction(value) {
    return ostring.call(value) === '[object Function]';
}

function isArray(value) {
    return ostring.call(value) === '[object Array]';
}





function isPromise(value) {
    return ostring.call(value) === '[object Promise]';
}

var pop$1 = function (obj, prop) {
    var value = void 0;
    if (isObject(obj)) {
        value = obj[prop];
        delete obj[prop];
        return value;
    } else if (isArray(obj)) {
        var index = +prop;
        if (index === index) return obj.splice(index, 1)[0];
        value = obj[prop];
        delete obj[prop];
        return value;
    }
};

var prefix$1 = "$";

function Map$1() {
    this._array = [];
}

Map$1.prototype = map$4.prototype = {
    constructor: Map$1,

    size: function size() {
        return this._array.length;
    },
    get: function get(key) {
        return this[prefix$1 + key];
    },
    set: function set(key, value) {
        if (!this.has(key)) this._array.push(key);
        this[prefix$1 + key] = value;
        return this;
    },
    has: function has(key) {
        return prefix$1 + key in this;
    },
    clear: function clear() {
        var self = this;
        this.each(function (_, property) {
            delete self[prefix$1 + property];
        });
        this._array.splice(0);
    },
    keys: function keys() {
        var entries = [];
        this.each(function (_, key) {
            entries.push(key);
        });
        return entries;
    },
    values: function values() {
        var entries = [];
        this.each(function (v) {
            entries.push(v);
        });
        return entries;
    },
    each: function each(callback) {
        var a = this._array,
            key;
        for (var i = 0; i < a.length; ++i) {
            key = a[i];
            callback(this.get(key), key, i);
        }
    }
};

function map$4(object, f) {
    var map = new Map$1();

    // Copy constructor.
    if (object instanceof Map$1) object.each(function (value, key) {
        map.set(key, value);
    });

    // Index array by numeric index or specified key function.
    else if (Array.isArray(object)) {
            var i = -1,
                n = object.length,
                o;
            if (f == null) while (++i < n) {
                map.set(i, object[i]);
            } else while (++i < n) {
                map.set(f(o = object[i], i, object), o);
            }
        }

        // Convert object to map.
        else if (object) for (var key in object) {
                map.set(key, object[key]);
            }return map;
}

// Code originally from https://github.com/soney/jsep
// Copyright (c) 2013 Stephen Oney, http://jsep.from.so/

// This is the full set of types that any JSEP node can be.
// Store them here to save space when minified
var code = {
    COMPOUND: 'Compound',
    IDENTIFIER: 'Identifier',
    MEMBER_EXP: 'MemberExpression',
    LITERAL: 'Literal',
    THIS_EXP: 'ThisExpression',
    CALL_EXP: 'CallExpression',
    UNARY_EXP: 'UnaryExpression',
    BINARY_EXP: 'BinaryExpression',
    LOGICAL_EXP: 'LogicalExpression',
    CONDITIONAL_EXP: 'ConditionalExpression',
    ARRAY_EXP: 'ArrayExpression'
};

var PERIOD_CODE = 46;
var COMMA_CODE = 44;
var SQUOTE_CODE = 39;
var DQUOTE_CODE = 34;
var OPAREN_CODE = 40;
var CPAREN_CODE = 41;
var OBRACK_CODE = 91;
var CBRACK_CODE = 93;
var QUMARK_CODE = 63;
var SEMCOL_CODE = 59;
var COLON_CODE = 58;
var throwError = function throwError(message, index) {
    var error = new Error(message + ' at character ' + index);
    error.index = index;
    error.description = message;
    throw error;
};
var t = true;
var unary_ops = { '-': t, '!': t, '~': t, '+': t };
var binary_ops = {
    '||': 1, '&&': 2, '|': 3, '^': 4, '&': 5,
    '==': 6, '!=': 6, '===': 6, '!==': 6,
    '<': 7, '>': 7, '<=': 7, '>=': 7,
    '<<': 8, '>>': 8, '>>>': 8,
    '+': 9, '-': 9,
    '*': 10, '/': 10, '%': 10
};
var getMaxKeyLen = function getMaxKeyLen(obj) {
    var max_len = 0,
        len;
    for (var key in obj) {
        if ((len = key.length) > max_len && obj.hasOwnProperty(key)) {
            max_len = len;
        }
    }
    return max_len;
};
var max_unop_len = getMaxKeyLen(unary_ops);
var max_binop_len = getMaxKeyLen(binary_ops);
var literals = {
    'true': true,
    'false': false,
    'null': null
};
var this_str = 'this';
var binaryPrecedence = function binaryPrecedence(op_val) {
    return binary_ops[op_val] || 0;
};
var createBinaryExpression = function createBinaryExpression(operator, left, right) {
    var type = operator === '||' || operator === '&&' ? code.LOGICAL_EXP : code.BINARY_EXP;
    return {
        type: type,
        operator: operator,
        left: left,
        right: right
    };
};
var isDecimalDigit = function isDecimalDigit(ch) {
    return ch >= 48 && ch <= 57; // 0...9
};
var isIdentifierStart = function isIdentifierStart(ch) {
    return ch === 36 || ch === 95 || // `$` and `_`
    ch >= 65 && ch <= 90 || // A...Z
    ch >= 97 && ch <= 122 || // a...z
    ch >= 128 && !binary_ops[String.fromCharCode(ch)]; // any non-ASCII that is not an operator
};
var isIdentifierPart = function isIdentifierPart(ch) {
    return ch === 36 || ch === 95 || // `$` and `_`
    ch >= 65 && ch <= 90 || // A...Z
    ch >= 97 && ch <= 122 || // a...z
    ch >= 48 && ch <= 57 || // 0...9
    ch >= 128 && !binary_ops[String.fromCharCode(ch)]; // any non-ASCII that is not an operator
};
var jsep = function jsep(expr) {
    // `index` stores the character number we are currently at while `length` is a constant
    // All of the gobbles below will modify `index` as we move along
    var index = 0,
        charAtFunc = expr.charAt,
        charCodeAtFunc = expr.charCodeAt,
        exprI = function exprI(i) {
        return charAtFunc.call(expr, i);
    },
        exprICode = function exprICode(i) {
        return charCodeAtFunc.call(expr, i);
    },
        length = expr.length,


    // Push `index` up to the next non-space character
    gobbleSpaces = function gobbleSpaces() {
        var ch = exprICode(index);
        // space or tab
        while (ch === 32 || ch === 9) {
            ch = exprICode(++index);
        }
    },


    // The main parsing function. Much of this code is dedicated to ternary expressions
    gobbleExpression = function gobbleExpression() {
        var test = gobbleBinaryExpression(),
            consequent,
            alternate;
        gobbleSpaces();
        if (exprICode(index) === QUMARK_CODE) {
            // Ternary expression: test ? consequent : alternate
            index++;
            consequent = gobbleExpression();
            if (!consequent) {
                throwError('Expected expression', index);
            }
            gobbleSpaces();
            if (exprICode(index) === COLON_CODE) {
                index++;
                alternate = gobbleExpression();
                if (!alternate) {
                    throwError('Expected expression', index);
                }
                return {
                    type: code.CONDITIONAL_EXP,
                    test: test,
                    consequent: consequent,
                    alternate: alternate
                };
            } else {
                throwError('Expected :', index);
            }
        } else {
            return test;
        }
    },


    // Search for the operation portion of the string (e.g. `+`, `===`)
    // Start by taking the longest possible binary operations (3 characters: `===`, `!==`, `>>>`)
    // and move down from 3 to 2 to 1 character until a matching binary operation is found
    // then, return that binary operation
    gobbleBinaryOp = function gobbleBinaryOp() {
        gobbleSpaces();
        var to_check = expr.substr(index, max_binop_len),
            tc_len = to_check.length;
        while (tc_len > 0) {
            if (binary_ops.hasOwnProperty(to_check)) {
                index += tc_len;
                return to_check;
            }
            to_check = to_check.substr(0, --tc_len);
        }
        return false;
    },


    // This function is responsible for gobbling an individual expression,
    // e.g. `1`, `1+2`, `a+(b*2)-Math.sqrt(2)`
    gobbleBinaryExpression = function gobbleBinaryExpression() {
        var node, biop, prec, stack, biop_info, left, right, i;

        // First, try to get the leftmost thing
        // Then, check to see if there's a binary operator operating on that leftmost thing
        left = gobbleToken();
        biop = gobbleBinaryOp();

        // If there wasn't a binary operator, just return the leftmost node
        if (!biop) {
            return left;
        }

        // Otherwise, we need to start a stack to properly place the binary operations in their
        // precedence structure
        biop_info = { value: biop, prec: binaryPrecedence(biop) };

        right = gobbleToken();
        if (!right) {
            throwError("Expected expression after " + biop, index);
        }
        stack = [left, biop_info, right];

        // Properly deal with precedence using [recursive descent](http://www.engr.mun.ca/~theo/Misc/exp_parsing.htm)
        while (biop = gobbleBinaryOp()) {
            prec = binaryPrecedence(biop);

            if (prec === 0) {
                break;
            }
            biop_info = { value: biop, prec: prec };

            // Reduce: make a binary expression from the three topmost entries.
            while (stack.length > 2 && prec <= stack[stack.length - 2].prec) {
                right = stack.pop();
                biop = stack.pop().value;
                left = stack.pop();
                node = createBinaryExpression(biop, left, right);
                stack.push(node);
            }

            node = gobbleToken();
            if (!node) {
                throwError("Expected expression after " + biop, index);
            }
            stack.push(biop_info, node);
        }

        i = stack.length - 1;
        node = stack[i];
        while (i > 1) {
            node = createBinaryExpression(stack[i - 1].value, stack[i - 2], node);
            i -= 2;
        }
        return node;
    },


    // An individual part of a binary expression:
    // e.g. `foo.bar(baz)`, `1`, `"abc"`, `(a % 2)` (because it's in parenthesis)
    gobbleToken = function gobbleToken() {
        var ch, to_check, tc_len;

        gobbleSpaces();
        ch = exprICode(index);

        if (isDecimalDigit(ch) || ch === PERIOD_CODE) {
            // Char code 46 is a dot `.` which can start off a numeric literal
            return gobbleNumericLiteral();
        } else if (ch === SQUOTE_CODE || ch === DQUOTE_CODE) {
            // Single or double quotes
            return gobbleStringLiteral();
        } else if (isIdentifierStart(ch) || ch === OPAREN_CODE) {
            // open parenthesis
            // `foo`, `bar.baz`
            return gobbleVariable();
        } else if (ch === OBRACK_CODE) {
            return gobbleArray();
        } else {
            to_check = expr.substr(index, max_unop_len);
            tc_len = to_check.length;
            while (tc_len > 0) {
                if (unary_ops.hasOwnProperty(to_check)) {
                    index += tc_len;
                    return {
                        type: code.UNARY_EXP,
                        operator: to_check,
                        argument: gobbleToken(),
                        prefix: true
                    };
                }
                to_check = to_check.substr(0, --tc_len);
            }

            return false;
        }
    },

    // Parse simple numeric literals: `12`, `3.4`, `.5`. Do this by using a string to
    // keep track of everything in the numeric literal and then calling `parseFloat` on that string
    gobbleNumericLiteral = function gobbleNumericLiteral() {
        var number = '',
            ch,
            chCode;
        while (isDecimalDigit(exprICode(index))) {
            number += exprI(index++);
        }

        if (exprICode(index) === PERIOD_CODE) {
            // can start with a decimal marker
            number += exprI(index++);

            while (isDecimalDigit(exprICode(index))) {
                number += exprI(index++);
            }
        }

        ch = exprI(index);
        if (ch === 'e' || ch === 'E') {
            // exponent marker
            number += exprI(index++);
            ch = exprI(index);
            if (ch === '+' || ch === '-') {
                // exponent sign
                number += exprI(index++);
            }
            while (isDecimalDigit(exprICode(index))) {
                //exponent itself
                number += exprI(index++);
            }
            if (!isDecimalDigit(exprICode(index - 1))) {
                throwError('Expected exponent (' + number + exprI(index) + ')', index);
            }
        }

        chCode = exprICode(index);
        // Check to make sure this isn't a variable name that start with a number (123abc)
        if (isIdentifierStart(chCode)) {
            throwError('Variable names cannot start with a number (' + number + exprI(index) + ')', index);
        } else if (chCode === PERIOD_CODE) {
            throwError('Unexpected period', index);
        }

        return {
            type: code.LITERAL,
            value: parseFloat(number),
            raw: number
        };
    },


    // Parses a string literal, staring with single or double quotes with basic support for escape codes
    // e.g. `"hello world"`, `'this is\nJSEP'`
    gobbleStringLiteral = function gobbleStringLiteral() {
        var str = '',
            quote = exprI(index++),
            closed = false,
            ch;

        while (index < length) {
            ch = exprI(index++);
            if (ch === quote) {
                closed = true;
                break;
            } else if (ch === '\\') {
                // Check for all of the common escape codes
                ch = exprI(index++);
                switch (ch) {
                    case 'n':
                        str += '\n';break;
                    case 'r':
                        str += '\r';break;
                    case 't':
                        str += '\t';break;
                    case 'b':
                        str += '\b';break;
                    case 'f':
                        str += '\f';break;
                    case 'v':
                        str += '\x0B';break;
                    default:
                        str += '\\' + ch;
                }
            } else {
                str += ch;
            }
        }

        if (!closed) {
            throwError('Unclosed quote after "' + str + '"', index);
        }

        return {
            type: code.LITERAL,
            value: str,
            raw: quote + str + quote
        };
    },


    // Gobbles only identifiers
    // e.g.: `foo`, `_value`, `$x1`
    // Also, this function checks if that identifier is a literal:
    // (e.g. `true`, `false`, `null`) or `this`
    gobbleIdentifier = function gobbleIdentifier() {
        var ch = exprICode(index),
            start = index,
            identifier;

        if (isIdentifierStart(ch)) {
            index++;
        } else {
            throwError('Unexpected ' + exprI(index), index);
        }

        while (index < length) {
            ch = exprICode(index);
            if (isIdentifierPart(ch)) {
                index++;
            } else {
                break;
            }
        }
        identifier = expr.slice(start, index);

        if (literals.hasOwnProperty(identifier)) {
            return {
                type: code.LITERAL,
                value: literals[identifier],
                raw: identifier
            };
        } else if (identifier === this_str) {
            return { type: code.THIS_EXP };
        } else {
            return {
                type: code.IDENTIFIER,
                name: identifier
            };
        }
    },


    // Gobbles a list of arguments within the context of a function call
    // or array literal. This function also assumes that the opening character
    // `(` or `[` has already been gobbled, and gobbles expressions and commas
    // until the terminator character `)` or `]` is encountered.
    // e.g. `foo(bar, baz)`, `my_func()`, or `[bar, baz]`
    gobbleArguments = function gobbleArguments(termination) {
        var ch_i,
            args = [],
            node,
            closed = false;
        while (index < length) {
            gobbleSpaces();
            ch_i = exprICode(index);
            if (ch_i === termination) {
                // done parsing
                closed = true;
                index++;
                break;
            } else if (ch_i === COMMA_CODE) {
                // between expressions
                index++;
            } else {
                node = gobbleExpression();
                if (!node || node.type === code.COMPOUND) {
                    throwError('Expected comma', index);
                }
                args.push(node);
            }
        }
        if (!closed) {
            throwError('Expected ' + String.fromCharCode(termination), index);
        }
        return args;
    },


    // Gobble a non-literal variable name. This variable name may include properties
    // e.g. `foo`, `bar.baz`, `foo['bar'].baz`
    // It also gobbles function calls:
    // e.g. `Math.acos(obj.angle)`
    gobbleVariable = function gobbleVariable() {
        var ch_i, node;
        ch_i = exprICode(index);

        if (ch_i === OPAREN_CODE) {
            node = gobbleGroup();
        } else {
            node = gobbleIdentifier();
        }
        gobbleSpaces();
        ch_i = exprICode(index);
        while (ch_i === PERIOD_CODE || ch_i === OBRACK_CODE || ch_i === OPAREN_CODE) {
            index++;
            if (ch_i === PERIOD_CODE) {
                gobbleSpaces();
                node = {
                    type: code.MEMBER_EXP,
                    computed: false,
                    object: node,
                    property: gobbleIdentifier()
                };
            } else if (ch_i === OBRACK_CODE) {
                node = {
                    type: code.MEMBER_EXP,
                    computed: true,
                    object: node,
                    property: gobbleExpression()
                };
                gobbleSpaces();
                ch_i = exprICode(index);
                if (ch_i !== CBRACK_CODE) {
                    throwError('Unclosed [', index);
                }
                index++;
            } else if (ch_i === OPAREN_CODE) {
                // A function call is being made; gobble all the arguments
                node = {
                    type: code.CALL_EXP,
                    'arguments': gobbleArguments(CPAREN_CODE),
                    callee: node
                };
            }
            gobbleSpaces();
            ch_i = exprICode(index);
        }
        return node;
    },


    // Responsible for parsing a group of things within parentheses `()`
    // This function assumes that it needs to gobble the opening parenthesis
    // and then tries to gobble everything within that parenthesis, assuming
    // that the next thing it should see is the close parenthesis. If not,
    // then the expression probably doesn't have a `)`
    gobbleGroup = function gobbleGroup() {
        index++;
        var node = gobbleExpression();
        gobbleSpaces();
        if (exprICode(index) === CPAREN_CODE) {
            index++;
            return node;
        } else {
            throwError('Unclosed (', index);
        }
    },


    // Responsible for parsing Array literals `[1, 2, 3]`
    // This function assumes that it needs to gobble the opening bracket
    // and then tries to gobble the expressions as arguments.
    gobbleArray = function gobbleArray() {
        index++;
        return {
            type: code.ARRAY_EXP,
            elements: gobbleArguments(CBRACK_CODE)
        };
    },
        nodes = [],
        ch_i,
        node;

    while (index < length) {
        ch_i = exprICode(index);

        // Expressions can be separated by semicolons, commas, or just inferred without any
        // separators
        if (ch_i === SEMCOL_CODE || ch_i === COMMA_CODE) {
            index++; // ignore separators
        } else {
            // Try to gobble each expression individually
            if (node = gobbleExpression()) {
                nodes.push(node);
                // If we weren't able to find a binary expression and are out of room, then
                // the expression passed in probably has too much
            } else if (index < length) {
                throwError('Unexpected "' + exprI(index) + '"', index);
            }
        }
    }

    // If there's only one expression just try returning the expression
    if (nodes.length === 1) {
        return nodes[0];
    } else {
        return {
            type: code.COMPOUND,
            body: nodes
        };
    }
};

/**
 * @method jsep.addUnaryOp
 * @param {string} op_name The name of the unary op to add
 * @return jsep
 */
jsep.addUnaryOp = function (op_name) {
    max_unop_len = Math.max(op_name.length, max_unop_len);
    unary_ops[op_name] = t;return this;
};

/**
 * @method jsep.addBinaryOp
 * @param {string} op_name The name of the binary op to add
 * @param {number} precedence The precedence of the binary op (can be a float)
 * @return jsep
 */
jsep.addBinaryOp = function (op_name, precedence) {
    max_binop_len = Math.max(op_name.length, max_binop_len);
    binary_ops[op_name] = precedence;
    return this;
};

/**
 * @method jsep.addLiteral
 * @param {string} literal_name The name of the literal to add
 * @param {*} literal_value The value of the literal
 * @return jsep
 */
jsep.addLiteral = function (literal_name, literal_value) {
    literals[literal_name] = literal_value;
    return this;
};

/**
 * @method jsep.removeUnaryOp
 * @param {string} op_name The name of the unary op to remove
 * @return jsep
 */
jsep.removeUnaryOp = function (op_name) {
    delete unary_ops[op_name];
    if (op_name.length === max_unop_len) {
        max_unop_len = getMaxKeyLen(unary_ops);
    }
    return this;
};

/**
 * @method jsep.removeBinaryOp
 * @param {string} op_name The name of the binary op to remove
 * @return jsep
 */
jsep.removeBinaryOp = function (op_name) {
    delete binary_ops[op_name];
    if (op_name.length === max_binop_len) {
        max_binop_len = getMaxKeyLen(binary_ops);
    }
    return this;
};

/**
 * @method jsep.removeLiteral
 * @param {string} literal_name The name of the literal to remove
 * @return jsep
 */
jsep.removeLiteral = function (literal_name) {
    delete literals[literal_name];
    return this;
};

function evaluate(self, expr) {

    switch (expr.type) {
        case code.IDENTIFIER:
            return self[expr.name];
        case code.LITERAL:
            return expr.value;
        case code.ARRAY_EXP:
            return expr.elements.map(function (elem) {
                return evaluate(self, elem);
            });
        case code.LOGICAL_EXP:
        case code.BINARY_EXP:
            return binaryExp(expr.operator, evaluate(self, expr.left), evaluate(self, expr.right));
        case code.CALL_EXP:
            return callExpression(self, expr.callee, expr.arguments);
        case code.MEMBER_EXP:
            return evaluate(evaluate(self, expr.object), expr.property);
        case code.CONDITIONAL_EXP:
            return evaluate(self, expr.test) ? evaluate(self, expr.consequent) : evaluate(self, expr.alternate);
        case code.UNARY_EXP:
            return unaryExp(expr.operator, evaluate(self, expr.argument));
    }
}

function identifiers$1(expr, all) {
    if (arguments.length === 1) all = set$1();
    switch (expr.type) {
        case code.IDENTIFIER:
            all.add(expr.name);break;
        case code.ARRAY_EXP:
            expr.elements.forEach(function (elem) {
                identifiers$1(elem, all);
            });break;
        case code.BINARY_EXP:
            identifiers$1(expr.left, all);identifiers$1(expr.right, all);break;
        case code.CALL_EXP:
            identifiers$1(expr.arguments, all);break;
        case code.MEMBER_EXP:
            identifiers$1(expr.object, all);break;
        case code.CONDITIONAL_EXP:
            identifiers$1(expr.test, all);identifiers$1(expr.consequent, all);evaluate(expr.alternate, all);break;
    }
    return all;
}

function callExpression(self, callee, args) {
    var func;

    args = args.map(function (arg) {
        return evaluate(self, arg);
    });

    if (callee.type !== code.IDENTIFIER) {
        self = evaluate(self, callee.object);
        callee = callee.property;
    }

    func = self[callee.name];
    return func.apply(self, args);
}

function unaryExp(op, arg) {
    if (!unaryFunctions[op]) unaryFunctions[op] = new Function("arg", 'return ' + op + ' arg');
    return unaryFunctions[op](arg);
}

function binaryExp(op, a, b) {
    if (!binaryFunctions[op]) binaryFunctions[op] = new Function("a", "b", 'return a ' + op + ' b');
    return binaryFunctions[op](a, b);
}

var unaryFunctions = {};
var binaryFunctions = {};

var providers = {
    logger: logger,
    fetch: fetch()
};

function fetch() {
    if (inBrowser) return window.fetch;
}

var prefix$2 = '[d3-view]';

var warn = function (msg) {
    providers.logger.warn(prefix$2 + ' ' + msg);
};

// tiny javascript expression parser
var proto$2 = {

    eval: function _eval(model) {
        return evaluate(model, this.parsed);
    },

    safeEval: function safeEval(model) {
        try {
            return evaluate(model, this.parsed);
        } catch (msg) {
            warn('Could not evaluate <<' + this.expr + '>> expression: ' + msg);
        }
    },

    identifiers: function identifiers() {
        return identifiers$1(this.parsed).values();
    }
};

function Expression(expr) {
    this.codes = code;
    this.expr = expr;
    this.parsed = jsep(expr);
}

Expression.prototype = proto$2;

var viewExpression = function (expr) {
    try {
        return new Expression(expr);
    } catch (msg) {
        warn('Could not parse <<' + expr + '>> expression: ' + msg);
    }
};

var UID = 0;

// Add a unique identifier to an object
var uid = function (o) {
    var uid = ++UID;

    Object.defineProperty(o, 'uid', {
        get: function get() {
            return uid;
        }
    });

    return o;
};

var sel = function (o) {

    Object.defineProperty(o, 'sel', {
        get: function get() {
            return select(this.el);
        }
    });

    return o;
};

//
// Directive Prototype
//
// Directives are special attributes with the d3- prefix.
// Directive attribute values are expected to be binding expressions.
// A directive’s job is to reactively apply special behavior to the DOM
// when the value of its expression changes.
//
// A directive can implement one or more of the directive methods:
//
//  * create
//  * mount
//  * refresh
//  * destroy
//
var prototype = {
    priority: 1,

    // hooks
    create: function create(expression) {
        return expression;
    },

    mount: function mount(model) {
        return model;
    },

    refresh: function refresh() {},

    destroy: function destroy() {},

    removeAttribute: function removeAttribute() {
        this.el.removeAttribute(this.name);
    },

    // Execute directive
    execute: function execute(model) {
        var _this = this;

        // No binding expression - nothing to do
        if (!this.expression) return;
        this.removeAttribute();

        model = this.mount(model);
        // No model returned - abort execution
        if (!model) return;

        var dir = this,
            sel$$1 = this.sel,
            refresh = function refresh() {
            try {
                dir.refresh(model, dir.expression.eval(model));
            } catch (msg) {
                warn('Error while refreshing "' + dir.name + '" directive: ' + msg);
            }
        };

        // Bind expression identifiers with model
        this.identifiers = this.expression.identifiers().map(function (id) {
            var event = id + '.' + dir.uid;
            model.$on(event, refresh);
            return id;
        });

        sel$$1.on('remove.' + dir.uid, function () {
            _this.identifiers.forEach(function (id) {
                model.$off(id + '.' + dir.uid);
            });
            dir.destroy(model);
        });

        refresh();
    }
};

// Directive constructor
var createDirective = function (obj) {

    function Directive(el, attr, arg) {
        this.el = el;
        this.name = attr.name;
        this.arg = arg;
        var expr = sel(uid(this)).create(attr.value);
        if (expr) this.expression = viewExpression(expr);
    }

    Directive.prototype = assign({}, prototype, obj);

    function directive(el, attr, arg) {
        return new Directive(el, attr, arg);
    }

    directive.prototype = Directive.prototype;
    return directive;
};

selection.prototype.model = model$1;

var asModel = function (model, initials) {
    var events = map$1();

    // event handler for any change in the model
    events.set('', dispatch('change'));

    Object.defineProperty(uid(model), '$events', {
        get: function get() {
            return events;
        }
    });
    model._Child = null;
    model.$update(initials);
};



function model$1(value) {
    return arguments.length ? this.property("__model__", value) : this.node().__model__;
}

//  $get method for an Model
//
//  attribute is a dotted string
var $get = function (attribute) {

    var bits = attribute.split('.'),
        key = bits.splice(0, 1),
        model = getModel(this, key);

    if (!(key in model)) return;

    var value = model[key];

    while (value && bits.length) {
        value = value[bits.splice(0, 1)];
    }return value;
};

function getModel(model, key) {

    while (!(key in model) && model.$parent) {
        model = model.$parent;
    }return model;
}

var debounce = function (callback) {
    var queued = false;
    return function () {
        if (!queued) {
            var args = Array.prototype.slice.call(arguments);
            queued = true;
            timeout$1(function () {
                queued = false;
                callback.apply(undefined, args);
            });
        }
    };
};

//  $set a reactive attribute for a Model
//
//  Set the value of a dotted attribute in the model or its parents
//  If the attribute is not already reactive make it as such.
//
var $set = function (key, value) {
    // property not reactive - make it as such
    if (!this.$events.get(key)) reactive(this, key, value);else this[key] = value;
};

function reactive(model, key, value) {
    var events = model.$events,
        oldValue,
        lazy;

    events.set(key, dispatch('change'));

    Object.defineProperty(model, key, property());

    // the event is fired at the next tick of the event loop
    // Cannot use the () => notation here otherwise arguments are incorrect
    var trigger = debounce(function () {
        oldValue = arguments[0];
        events.get(key).call('change', model, value, oldValue);
        // trigger model change event only when not a lazy property
        if (!lazy) events.get('').call('change', model, key);
    });

    // Trigger the callback once for initialization
    trigger();

    function update(newValue) {
        if (lazy) newValue = lazy.get.call(model);
        if (newValue === value) return;
        // trigger lazy callbacks
        trigger(value);
        // update the value
        value = newValue;
    }

    function property() {
        var prop = {
            get: function get() {
                return value;
            }
        };

        if (isFunction(value)) value = { get: value };

        // calculated attribute
        if (isObject(value) && isFunction(value.get)) {
            lazy = value;
            value = lazy.get.call(model);

            if (lazy.reactOn) lazy.reactOn.forEach(function (name) {
                model.$on(name + '.' + key, update);
            });else model.$on('.' + key, update);

            if (isFunction(lazy.set)) prop.set = lazy.set;
        } else prop.set = update;

        return prop;
    }
}

// Add change callback to a model reactive attribute
var $on = function (name, callback) {

    // When no name is provided, whait for changes on this model - no its parents
    if (arguments.length === 1 && isFunction(name)) {
        callback = name;
        name = '';
    }

    var bits = name.split('.'),
        key = bits[0],
        event = getEvent(this, key);

    if (!event) return warn('Cannot bind to "' + key + '" - no such reactive property');

    // event from a parent model, add model uid to distinguish it from other child callbacks
    if (!this.$events.get(name)) bits.push(this.uid);

    bits[0] = 'change';
    return event.on(bits.join('.'), callback);
};

function getEvent(model, name) {
    var event = model.$events.get(name);
    if (!event && model.parent) return getEvent(model.parent, name);
    return event;
}

// Update a model with reactive model data
var $update = function (data) {
    if (data) for (var key in data) {
        if (key.substring(0, 1) === '$') {
            if (this.constructor.prototype[key]) warn('Cannot set attribute method ' + key + ', it is protected');else this[key] = data[key];
        } else this.$set(key, data[key]);
    }
    return this;
};

// create a child model
var $child = function (initials) {
    if (!this._Child) this._Child = createChildConstructor(this);

    var parent = this,
        child = new this._Child(initials);

    Object.defineProperty(child, 'parent', {
        get: function get() {
            return parent;
        }
    });

    return child;
};

function createChildConstructor(model) {

    function Child(initials) {
        asModel(this, initials);
    }

    Child.prototype = model;
    return Child;
}

function setbase(key, value) {
    if (!this.$events.has(key) && this.$parent) return setbase.call(this.$parent, key, value);
    this.$set(key, value);
}

//
//  Model class
//
//  The model is at the core of d3-view reactive data component
function Model(initials) {
    asModel(this, initials);
}

function model(initials) {
    return new Model(initials);
}

model.prototype = Model.prototype;

// Public API methods
Model.prototype.$on = $on;
Model.prototype.$update = $update;
Model.prototype.$get = $get;
Model.prototype.$set = $set;
Model.prototype.$child = $child;
Model.prototype.$new = $new;
Model.prototype.$setbase = setbase;

function $new(initials) {

    var parent = this,
        child = model(initials);

    Object.defineProperty(child, 'parent', {
        get: function get() {
            return parent;
        }
    });

    return child;
}

// Model factory function
var createModel = function (directives, data, parent) {
    // model directive
    var dir = directives.pop('model');

    // For loop directive not permitted in the root view
    if (directives.get('for') && !parent) {
        warn('Cannot have a "d3-for" directive in the root view element');
        directives.pop('for');
    }

    if (!parent) {
        if (dir) warn('Cannot have a d3-model directive in the root element');
        return model(data);
    }

    // Execute model directive
    if (dir) {
        dir.execute(parent);
        var model$$1 = dir.sel.model();
        if (model$$1) model$$1.$update(data);
        return model$$1;
    } else if (data) return parent.$child(data);else return parent;
};

// No value, it has its own directive
var attributes = ['name', 'class', 'disabled', 'readonly', 'required'];

selection.prototype.directives = directives;

function directives(value) {
    return arguments.length ? this.property("__directives__", value) : this.node().__directives__;
}

var getdirs = function (element, directives) {
    var sel = select(element),
        dirs = sel.directives();
    if (dirs) return dirs;
    dirs = new Directives();
    sel.directives(dirs);

    if (!directives) return dirs;

    for (var i = 0; i < element.attributes.length; ++i) {
        var attr = element.attributes[i],
            bits = attr.name.split('-'),
            arg = bits[2],
            dirName = bits[0] === 'd3' ? bits[1] : null;

        if (dirName) {
            if (!arg && attributes.indexOf(dirName) > -1) {
                arg = dirName;
                dirName = 'attr';
            }
            var directive = directives.get(dirName);
            if (directive) dirs.add(dirName, directive(element, attr, arg));else warn(element.tagName + ' cannot find directive "' + dirName + '". Did you forget to register it?');
        }
        dirs.attrs[attr.name] = attr.value;
    }
    return dirs.sorted();
};

// Directives container
function Directives() {
    this.attrs = {};
    this._dirs = {};
    this._all = [];
}

Directives.prototype = {
    size: function size() {
        return this._all.length;
    },

    get: function get(name) {
        return this._dirs[name];
    },

    pop: function pop(name) {
        var dir = this._dirs[name];
        if (dir) {
            delete this._dirs[name];
            dir.removeAttribute();
            var index = this._all.indexOf(dir);
            if (index > -1) this._all.splice(index, 1);
        }
        return dir;
    },

    add: function add(name, dir) {
        this._dirs[name] = dir;
        this._all.push(dir);
    },

    sorted: function sorted() {
        this._all.sort(function (d) {
            return -d.priority;
        });
        return this;
    },

    forEach: function forEach(callback) {
        this._all.forEach(callback);
    }
};

// Mount a model into an element
function mount$1(model, el) {
    var sel = select(el),
        directives = sel.directives();

    // directives not available, this is a mount from
    // a directive/loop and requires a new model
    if (!directives) {
        directives = getdirs(el, model.$vm ? model.$vm.directives : null);
        model = createModel(directives, null, model);
    }

    // Loop directive is special
    var loop = directives.pop('for');

    if (loop) {
        loop.execute(model);
        return true; // Important - skip mounting a component
    } else {
        if (!sel.model()) sel.model(model);
        mountChildren(sel, directives);
    }
}

function mountChildren(sel, directives) {
    var model = sel.model(),
        vm = model.$vm;

    sel.selectAll(function () {
        return this.children;
    }).each(function () {
        var component = vm ? vm.components.get(this.tagName.toLowerCase()) : null;

        if (component) component({ parent: vm }).mount(this);else {
            // vanilla element
            mount$1(model, this);
            var child = select(this);
            // cleanup model if not needed
            if (child.model() === model) child.model(null);
        }
    });

    // Execute directives
    if (directives.size()) {
        directives.forEach(function (d) {
            d.execute(model);
        });
    } else
        // no directives - remove property
        sel.directives(null);
}

//
//  d3-model directive
//  ===================
//
//  Create a new model on the element based on data from parent models
//  This is a special directive and the first to be mounted
var model$2 = {

    mount: function mount(model) {
        var expr = this.expression;
        if (expr.parsed.type !== expr.codes.IDENTIFIER) return warn('d3-model expression support identifiers only, got "' + expr.parsed.type + '": ' + this.expression);
        var newModel = model.$child(expr.eval(model));
        this.sel.model(newModel);
        model.$setbase(this.expression.expr, newModel);
    }

};

var properties = ['disabled', 'readonly', 'required'];

//
//  d3-attr:<attr> directive
//  ==============================
//
//  Create a one-way binding between a model and a HTML element attribute
var attr = {

    create: function create(expression) {
        if (!this.arg) return warn('Cannot bind to empty attribute. Specify :<attr-name>');
        return expression;
    },

    refresh: function refresh(model, value) {
        if (this.arg === 'class') return this.refreshClass(value);
        if (isArray(value)) return warn('Cannot apply array to attribute ' + this.arg);
        if (properties.indexOf(this.arg) > -1) this.sel.property(this.arg, value || null);else this.sel.attr(this.arg, value);
    },

    refreshClass: function refreshClass(value) {
        var sel = this.sel;

        if (!isArray(value)) value = [value];

        if (this.oldValue) this.oldValue.forEach(function (entry) {
            if (entry) sel.classed(entry, false);
        });

        this.oldValue = value.map(function (entry) {
            var exist = true;
            if (isArray(entry)) {
                exist = entry[1];
                entry = entry[0];
            }
            if (entry) sel.classed(entry, exist);
            return entry;
        });
    }

};

//
//  d3-html
//  =============
//  attach html or text to the innerHtml property
//
//  Usage:
//      <div id="foo" d3-html="output"></div>
var html = {

    refresh: function refresh(model, html) {
        if (isString(html)) this.sel.html(html);
    }
};

var base = {

    on: function on(model, attrName) {
        var refresh = refreshFunction(this, model, attrName);

        // DOM => model binding
        select(this.el).on('input', refresh).on('change', refresh);
    }
};

function createTag(proto) {

    function Tag(el) {
        this.el = el;
    }

    Tag.prototype = assign({}, base, proto);

    function tag(el) {
        var t = new Tag(el);

        Object.defineProperty(t, 'value', {
            get: function get() {
                return select(t.el).property('value');
            },
            set: function set(v) {
                select(t.el).property('value', v);
            }
        });

        return t;
    }

    tag.prototype = Tag.prototype;

    return tag;
}

function refreshFunction(dom, model, attrName) {

    return debounce(function () {
        model.$set(attrName, dom.value);
    });
}

var input$1 = createTag();

var textarea = createTag();

var tags = {
    input: input$1,
    textarea: textarea
};

//
//  d3-value directive
//  ===================
//
//  Two-way data binding for HTML elements supporting the value property
var value$1 = {

    create: function create(expression) {
        var type = this.sel.attr('type'),
            tag = this.el.tagName.toLowerCase(),
            Tag = tags[type] || tags[tag];

        if (!Tag) return warn('Cannot apply d3-value directive to ' + tag);
        this.tag = new Tag(this.el);
        return expression;
    },

    mount: function mount(model) {
        var expr = this.expression;
        // TODO: relax this constraint
        if (expr.parsed.type !== expr.codes.IDENTIFIER) return warn('d3-value expression support identifiers only, got "' + expr.parsed.type + '": ' + this.expression);
        var attrName = this.expression.expr;
        //
        // Create the model reactive attribute
        model.$set(attrName, this.tag.value);

        this.tag.on(model, attrName);
        return model;
    },

    refresh: function refresh(model, value) {
        this.tag.value = value;
    },

    destroy: function destroy() {
        this.tag.off();
    }
};

//
//  d3-show
//  =============
//  Show or hide an element
//
var show = {

    mount: function mount(model) {
        this.block = this.sel.style('display') ? 'block' : null;
        return model;
    },

    refresh: function refresh(model, value) {
        if (value) this.sel.style('display', this.block);else this.sel.style('display', 'none');
    }
};

//
//  d3-on directive
var on$1 = {

    mount: function mount(model) {
        var event = this.arg || 'click',
            expr = this.expression;

        // DOM event => model binding
        this.sel.on(event + '.' + this.uid, function () {
            expr.eval(model);
        });
    }
};

//
//  d3-transition
//  =============
var transition$1 = {

    refresh: function refresh(model) {
        transition(model);
    }
};

//
//  d3-for directive
//  ======================
//
//  Repeat a element over an array of items and establish
//  a one way binding between the array and the Dom
var d3For = {

    create: function create(expression) {
        var bits = [];
        expression.trim().split(' ').forEach(function (v) {
            v ? bits.push(v) : null;
        });
        if (bits.length !== 3 || bits[1] != 'in') return warn('d3-for directive requires "item in expression" template');
        this.itemName = bits[0];
        this.itemClass = 'for' + this.uid;
        return bits[2];
    },

    mount: function mount$1(model) {
        this.creator = this.el;
        this.el = this.creator.parentNode;
        // remove the creator from the DOM
        select(this.creator).remove();
        return model;
    },

    refresh: function refresh(model, items) {
        if (!isArray(items)) return;

        var creator$$1 = this.creator,
            selector$$1 = creator$$1.tagName + '.' + this.itemClass,
            itemName = this.itemName,
            entries = this.sel.selectAll(selector$$1).data(items);

        entries.enter().append(function () {
            return creator$$1.cloneNode(true);
        }).classed(this.itemClass, true).each(function (d, index) {
            var x = { index: index };
            x[itemName] = d;
            mount$1(model.$child(x), this);
        });

        entries.exit().remove();
    }
};

//
//  d3-if
//  =============
//
//  Remove an element if the condition is not satisfied
//
var d3If = {

    refresh: function refresh(model, value) {
        if (value) this.sel.style('display', null);else this.sel.style('display', 'none');
    }
};

var directives$1 = {
    model: model$2,
    attr: attr,
    html: html,
    value: value$1,
    show: show,
    on: on$1,
    transition: transition$1,
    'for': d3For,
    'if': d3If
};

var asSelect = function (el) {
    if (el && !isFunction(el.size)) return select(el);
    return el;
};

var maybeJson = function (value) {
    if (isString(value)) {
        try {
            return JSON.parse(value);
        } catch (msg) {
            return value;
        }
    }
    return value;
};

// require handlebar
function compile$1(text) {
    var handlebars = inBrowser ? window.handlebars : require('handlebars');
    if (handlebars) return handlebars.compile(text);
    warn('compile function requires handlebars');
}

function html$1(source, context) {
    if (isString(source)) {
        if (context) {
            var s = compile$1(source);
            if (!s) return source;
        } else return source;
    }
    return source(context);
}

function htmlElement(source, context) {
    var el = select(document.createElement('div'));
    el.html(html$1(source, context));
    var children = el.node().children;
    if (children.length !== 1) warn('HtmlElement function should return one root element only, got ' + children.length);
    return children[0];
}

// Core Directives
var coreDirectives = extendDirectives(map$1(), directives$1);

// prototype for both views and components
var proto$1 = {
    isd3: true,
    providers: providers,
    htmlElement: htmlElement,
    // same as export
    viewElement: htmlElement,

    init: function init() {},

    mounted: function mounted$1() {},

    createElement: function createElement(tag) {
        return select(document.createElement(tag));
    },

    responseError: function responseError(response) {
        var self$$1 = this;
        response.json().then(function (data) {
            self$$1.error(data, response);
        });
    },
    error: function error(data) {
        data.level = 'error';
        this.message(data);
    },
    message: function message(data) {
        var self$$1 = this;
        this.root.events.call('message', self$$1, data);
    },


    // Shortcut for fetch function in providers
    fetch: function fetch(url, options) {
        var fetch = providers.fetch;
        return arguments.length == 1 ? fetch(url) : fetch(url, options);
    }
};

//
// prototype for views
var protoView = assign({}, proto$1, {

    use: function use(plugin) {
        if (isObject(plugin)) plugin.install(this);else plugin(this);
        return this;
    },

    addComponent: function addComponent(name, obj) {
        if (this.isMounted) return warn('already mounted, cannot add component');
        var component = createComponent(obj, protoComponent);
        this.components.set(name, component);
        return component;
    },

    addDirective: function addDirective(name, obj) {
        if (this.isMounted) return warn('already mounted, cannot add directive');
        var directive = createDirective(obj);
        this.directives.set(name, directive);
        return directive;
    },

    mount: function mount(el) {
        if (mounted$1(this)) warn('already mounted');else {
            el = element$2(el);
            if (el) {
                var parent = this.parent ? this.parent.model : null;
                this.model = createModel(getdirs(el, this.directives), this.model, parent);
                asView(this, el);
            }
        }
        return this;
    }
});

//
// prototype for components
var protoComponent = assign({}, proto$1, {

    render: function render() {},

    mount: function mount(el) {
        if (mounted$1(this)) warn('already mounted');else {
            var parent = this.parent ? this.parent.model : null,
                directives = getdirs(el, this.directives),
                model = createModel(directives, this.model, parent);
            //
            this.model = model;
            //
            // When a for d3-for loop is active we abort mounting this component
            // The component will be mounted as many times the the for loop requires
            if (mount$1(this.model, el)) return;

            var data = select(el).datum() || {};

            if (isArray(this.props)) {
                var key, value;
                this.props.forEach(function (prop) {
                    key = directives.attrs[prop];
                    if (model[key]) value = model[key];else value = maybeJson(key);
                    data[prop] = value;
                });
            }
            //
            // create the new element from the render function
            var newEl = this.render(data, directives.attrs);
            if (isPromise(newEl)) {
                var self$$1 = this;
                newEl.then(function (element) {
                    compile$$1(self$$1, el, element);
                });
            } else compile$$1(this, el, newEl);
        }
        return this;
    }
});

// factory of View and Component constructors
function createComponent(o, prototype) {
    prototype = prototype || protoView;
    if (isFunction(o)) o = { render: o };

    var obj = assign({}, o),
        classComponents = extendComponents(map$1(), pop$1(obj, 'components')),
        classDirectives = extendDirectives(map$1(), pop$1(obj, 'directives')),
        model = pop$1(obj, 'model'),
        props = pop$1(obj, 'props');

    function Component(options) {
        var parent = pop$1(options, 'parent'),
            components = map$1(parent ? parent.components : null),
            directives = map$1(parent ? parent.directives : coreDirectives),
            events = dispatch('message');

        classComponents.each(function (comp, key) {
            components.set(key, comp);
        });
        classDirectives.each(function (comp, key) {
            directives.set(key, comp);
        });
        extendComponents(components, pop$1(options, 'components'));
        extendDirectives(directives, pop$1(options, 'directives'));

        Object.defineProperties(this, {
            components: {
                get: function get() {
                    return components;
                }
            },
            directives: {
                get: function get() {
                    return directives;
                }
            },
            parent: {
                get: function get() {
                    return parent;
                }
            },
            root: {
                get: function get() {
                    return parent ? parent.root : this;
                }
            },
            props: {
                get: function get() {
                    return props;
                }
            },
            uid: {
                get: function get() {
                    return this.model.uid;
                }
            },
            events: {
                get: function get() {
                    return events;
                }
            }
        });
        this.model = assign({}, model, pop$1(options, 'model'));
        this.init(options);
    }

    Component.prototype = assign({}, prototype, obj);

    function component(options) {
        return new Component(options);
    }

    component.prototype = Component.prototype;

    return component;
}

function extendComponents(container, components) {
    map$1(components).each(function (obj, key) {
        container.set(key, createComponent(obj, protoComponent));
    });
    return container;
}

function extendDirectives(container, directives) {
    map$1(directives).each(function (obj, key) {
        container.set(key, createDirective(obj));
    });
    return container;
}

function asView(vm, element) {
    var model = vm.model;

    Object.defineProperty(sel(vm), 'el', {
        get: function get() {
            return element;
        }
    });

    Object.defineProperty(model, '$vm', {
        get: function get() {
            return vm;
        }
    });

    // Apply model to element
    select(element).model(model);

    mount$1(model, element);
    //
    // mounted hook
    timeout$1(function () {
        vm.mounted();
    });
}

function element$2(el) {
    if (!el) return warn('element not defined, pass an identifier or an HTMLElement object');
    var d3el = isFunction(el.node) ? el : select(el),
        element = d3el.node();
    if (!element) warn('could not find ' + el + ' element');else return element;
}

function mounted$1(view) {
    var mounted = view.isMounted;
    if (!mounted) Object.defineProperty(view, 'isMounted', {
        get: function get() {
            return true;
        }
    });
    return mounted;
}

function compile$$1(vm, el, element) {
    if (!element) return warn('render function must return a single HTML node. It returned nothing!');
    element = asSelect(element);
    if (element.size() !== 1) warn('render function must return a single HTML node');
    element = element.node();
    //
    // Insert before the component element
    el.parentNode.insertBefore(element, el);
    // remove the component element
    select(el).remove();
    //
    // Mount
    asView(vm, element);
}

// the view constructor
var index$3 = createComponent();

// Add callback to execute when the DOM is ready
var dom = function (callback) {
    readyCallbacks.push(callback);
    if (document.readyState !== 'complete') {
        document.addEventListener('DOMContentLoaded', _completed);
        // A fallback to window.onload, that will always work
        window.addEventListener('load', _completed);
    } else domReady();
};

var readyCallbacks = [];

function _completed() {
    document.removeEventListener('DOMContentLoaded', _completed);
    window.removeEventListener('load', _completed);
    domReady();
}

function domReady() {
    var callback = void 0;
    while (readyCallbacks.length) {
        callback = readyCallbacks.shift();
        timeout$1(callback);
    }
}

var providers$1 = {
    logger: logger
};

var prefix$3 = '[d3-form]';

var warn$1 = function (msg) {
    providers$1.logger.warn(prefix$3 + ' ' + msg);
};

var modelDataKeys = ['labelSrOnly', 'layout'];

var componentsFromType = {
    'text': 'input',
    'password': 'input',
    'number': 'input'
};

// return A promise which execute a callback at the next event Loop cycle
function nextTick(callback) {
    var self$$1 = this;
    return new Promise(function (resolve) {
        resolve();
    }).then(function () {
        return callback.call(self$$1);
    });
}

function formComponent(child) {
    var type = child.type || 'text';
    return componentsFromType[type] || type;
}

function addChildren(sel) {
    var children = this.data.children;
    if (children) {
        if (!isArray(children)) {
            warn$1('children should be an array of fields, for ' + (typeof children === 'undefined' ? 'undefined' : _typeof(children)));
            return sel;
        }
        sel.selectAll('.d3form').data(children).enter().append(formChild).classed('d3form', true);
    }
    return sel;
}

function modelData(data) {
    if (!data) data = {};
    this.data = data;
    var model = this.model;
    modelDataKeys.forEach(function (key) {
        if (key in data) model.$set(key, data[key]);
    });
    return data;
}

function formChild(child) {
    var component = formComponent(child);
    if (!component) {
        warn$1('Could not find form component ' + child.type);
        component = 'input';
        child.type = 'hidden';
    }
    return document.createElement('d3' + component);
}

//
// Fieldset element
var fieldset = {

    render: function render(data) {
        var el = this.createElement('fieldset');
        modelData.call(this, data);
        return addChildren.call(this, el);
    }

};

var formElement = {
    wrap: function wrap(sel) {
        var field = this,
            theme = getTheme(field),
            wrappers = theme ? theme[sel.attr('type')] || theme[sel.node().tagName.toLowerCase()] : null;
        if (!wrappers || !theme.wrappers) return sel;

        var wrapped = sel,
            wrap;

        wrappers.forEach(function (wrapper) {
            wrap = theme.wrappers[wrapper];
            if (wrap) wrapped = wrap.call(field, wrapped, sel);else warn$1('Could not find form field wrapper ' + wrapper);
        });

        return wrapped;
    },
    wrapTemplate: function wrapTemplate(sel, template) {
        var div = document.createElement('div'),
            outer = select(div).html(template),
            slot = outer.select('slot');

        if (!slot.size()) {
            warn$1('template does not provide a slot element');
            return sel;
        }
        var target = select(slot.node().parentNode);
        sel.nodes().forEach(function (node) {
            target.insert(function () {
                return node;
            }, 'slot');
        });
        slot.remove();
        return selectAll(div.children);
    }
};

// A mixin for all form field components
var field = assign({

    model: {
        error: '',
        isDirty: false,
        showError: {
            reactOn: ['error', 'isDirty', 'formSubmitted'],
            get: function get() {
                if (this.error) return this.isDirty || this.formSubmitted;
                return false;
            }
        }
    },

    mounted: function mounted() {
        this.model.$on('value', function () {
            this.isDirty = true;
        });
    },
    inputData: function inputData(data) {
        data = modelData.call(this, data);
        if (!data.name) warn$1('Input field without a name');
        data.placeholder = data.placeholder || data.label || data.name;
        data.id = data.id || 'd3f' + this.uid;
        this.model.inputs[data.name] = this.model;
        return data;
    }
}, formElement);

function getTheme(component) {
    var theme = component.formTheme;
    if (!theme && component.parent) return getTheme(component.parent);else return theme;
}

var required$1 = {
    set: function set(el, data) {
        var value = data.required;
        if (isString(value)) el.attr('d3-required', value);else el.property('required', value || null);
    },
    validate: function validate(el, value) {
        if (el.property('required')) {
            if (!value) return 'required';
        } else if (value === '') return true;
    }
};

var minlength = {
    set: function set(el, data) {
        var value = data.minlength;
        if (isString(value)) el.attr('d3-attr-minlength', value);else if (value !== undefined) el.attr('minlength', value);
    },
    validate: function validate(el, value) {
        var l = +el.attr('minlength');
        if (l === l && l > 0 && value.length < l) return 'too short - ' + l + ' characters or more expected';
    }
};

var maxlength = {
    set: function set(el, data) {
        var value = data.maxlength;
        if (isString(value)) el.attr('d3-attr-maxlength', value);else if (value !== undefined) el.attr('maxlength', value);
    },
    validate: function validate(el, value) {
        var l = +el.attr('maxlength');
        if (l === l && l > 0 && value.length > l) return 'too long - ' + l + ' characters or less expected';
    }
};

var min$1 = {
    set: function set(el, data) {
        var value = data.min;
        if (isString(value)) el.attr('d3-attr-min', value);else if (value !== undefined) el.attr('min', value);
    },
    validate: function validate(el, value) {
        var r = range$2(el);
        if (r && +value < r[0]) return 'must be greater or equal ' + r[0];
    }
};

var max$2 = {
    set: function set(el, data) {
        var value = data.max;
        if (isString(value)) el.attr('d3-attr-max', value);else if (value !== undefined) el.attr('max', value);
    },
    validate: function validate(el, value) {
        var r = range$2(el);
        if (r && +value > r[1]) return 'must be less or equal ' + r[1];
    }
};

var validators = {
    get: function get(model, custom) {
        var validators = this.all.slice(0);
        if (isObject(custom)) for (var key in custom) {
            validators.push(customValidator(key, custom[key]));
        }return validators;
    },
    set: function set(vm, el) {
        vm.model.validators.forEach(function (validator) {
            validator.set(el, vm.data);
        });

        vm.model.$on(this.validate);
    },
    validate: function validate(property) {
        if (property !== 'value') return;

        var vm = this.$vm,
            validators = this.validators,
            el = vm.sel.attr('id') === vm.data.id ? vm.sel : vm.sel.select('#' + vm.data.id),
            value = this.value,
            validator,
            msg;

        for (var i = 0; i < validators.length; ++i) {
            validator = validators[i];
            msg = validator.validate(el, value);
            if (msg) {
                if (msg === true) msg = '';
                break;
            }
        }

        this.error = msg || '';
    },


    all: [required$1, minlength, maxlength, min$1, max$2]
};

function range$2(el) {
    var l0 = el.attr('min'),
        l1 = el.attr('max');
    l0 = l0 === null ? -Infinity : +l0;
    l1 = l1 === null ? Infinity : +l1;
    return [l0, l1];
}

function customValidator(key, method) {

    return {
        set: function set(el, data) {
            var value = data[key];
            if (!value) return;
        },
        validate: function validate(el, value) {
            return method(el, value);
        }
    };
}

//
// Input element
var input$2 = assign({

    render: function render(data) {
        data = this.inputData(data);
        var el = this.createElement('input').attr('id', data.id).attr('type', data.type || 'text').attr('name', data.name).attr('d3-value', 'value').attr('placeholder', data.placeholder);

        validators.set(this, el);
        return this.wrap(el);
    }
}, field);

//
// Textarea element
var textarea$1 = assign({

    render: function render(data) {
        data = this.inputData(data);
        var el = this.createElement('textarea').attr('id', data.id).attr('name', data.name).attr('placeholder', data.placeholder).attr('d3-value', 'value').attr('d3-validate', 'validators');

        validators.set(this, el);
        return this.wrap(el);
    }

}, field);

//
// Select element
var select$1 = assign({}, field, {

    model: assign({
        options: [],
        $optionLabel: optionLabel,
        $optionValue: optionValue
    }, field.model),

    render: function render(data) {
        data = this.inputData(data);
        var el = this.createElement('select').attr('id', data.id).attr('name', data.name).attr('d3-value', 'value').attr('placeholder', data.placeholder);

        this.model.options = data.options;

        el.append('option').attr('d3-for', 'option in options').attr('d3-html', '$optionLabel()').attr('d3-attr-value', '$optionValue()');

        validators.set(this, el);
        return this.wrap(el);
    }
});

function optionValue() {
    if (isArray(this.option)) return this.option[0];
    return this.option;
}

function optionLabel() {
    if (isArray(this.option)) return this.option[1] || this.option[0];
    return this.option;
}

//
// Submit element
var submit = assign({

    render: function render(data) {
        data = modelData.call(this, data);
        data.type = data.type || 'submit';
        this.model.$set('error', false);
        if (!isString(data.disabled)) {
            this.model.$set('disabled', data.disabled || null);
            data.disabled = 'disabled';
        }
        if (!data.click) data.click = '$vm.click()';

        var el = this.createElement('button').attr('type', data.type).attr('name', data.name).attr('d3-attr-disabled', data.disabled).attr('d3-on-click', data.click).html(data.label || 'submit');

        return this.wrap(el);
    },

    click: function click() {
        this.model.form.actions.submit.call(this, exports.event);
    }
}, formElement);

// Form Responses
var responses = {
    "default": defaultResponse,
    redirect: redirect
};

function defaultResponse(response) {
    var data = response.json();
    this.message(data);
}

function redirect() {
    window.location.href = this.data.redirectTo || '/';
}

// Form Actions
var actions = {
    submit: submit$1
};

function submit$1(e) {
    var form = this && this.model ? this.model.form : null;

    if (!form) {
        warn$1('form not available, cannot submit');
        return;
    }

    if (e) {
        e.preventDefault();
        e.stopPropagation();
    }

    var fetch = providers$1.fetch,
        ct = (form.data.enctype || '').split(';')[0],
        action = form.data.action,
        url = isObject(action) ? action.url : action,
        data = form.inputData(),
        options = {};

    if (!fetch) {
        warn$1('fetch provider not available, cannot submit');
        return;
    }

    if (!url) {
        warn$1('No url, cannot submit');
        return;
    }

    if (ct === 'application/json') {
        options.headers = {
            'Content-Type': form.data.enctype
        };
        options.body = JSON.stringify(data);
    } else {
        options.body = new FormData();
        for (var key in data) {
            options.body.set(key, data[key]);
        }
    }

    // Flag the form as submitted
    form.setSubmit();
    options.method = form.method || 'post';
    fetch(url, options).then(success, failure);

    function success(response) {
        form.setSubmitDone();
        form.response(response);
    }

    function failure() {
        form.setSubmitDone();
    }
}

// Main form component
var form = {

    // make sure a new model is created for this component
    props: ['json'],

    model: {
        formSubmitted: false,
        formPending: false
    },

    components: {
        'd3fieldset': fieldset,
        'd3input': input$2,
        'd3textarea': textarea$1,
        'd3select': select$1,
        'd3submit': submit
    },

    render: function render(data) {
        var model = this.model,
            form = this.createElement('form').attr('novalidate', ''),
            self$$1 = this;
        //
        model.inputs = {};
        model.form = this;
        //
        var json = data['json'];
        if (isString(json)) {
            var fetch = providers$1.fetch;
            return fetch(json, { method: 'GET' }).then(function (response) {
                if (response.status === 200) return response.json().then(build);else warn$1('Could not load form from ' + json + ': status ' + response.status);
            });
        } else return build(json);

        function build(formData) {
            modelData.call(self$$1, formData);
            //
            // Form validations
            model.validators = validators.get(model, data.validators);
            //
            // Form actions
            self$$1.actions = {};
            for (var key in actions) {
                var action = self$$1.data[key];
                if (isString(action)) action = self$$1.model.$get(action);
                self$$1.actions[key] = action || actions[key];
            }
            addChildren.call(self$$1, form);
            return form;
        }
    },

    inputData: function inputData() {
        var inputs = this.model.inputs,
            data = {},
            value;
        for (var key in inputs) {
            value = inputs[key].value;
            if (value !== undefined) data[key] = value;
        }

        return data;
    },

    setSubmit: function setSubmit() {
        var _this = this;

        this.model.formSubmitted = true;
        this.model.formPending = true;
        return nextTick.call(this, function () {
            return _this.isValid();
        });
    },

    setSubmitDone: function setSubmitDone() {
        this.model.formPending = false;
    },

    isValid: function isValid() {
        var inp;
        for (var key in this.model.inputs) {
            inp = this.model.inputs[key];
            if (inp.error) return false;
        }
        return true;
    },
    inputError: function inputError(error) {
        var input = this.model.inputs[error.name];
        if (!input) {
            warn$1('Unknown input, cannot set input error');
            this.error(error);
        }
    },
    response: function response(_response) {
        if (!_response) return;
        var handler;

        if (_response.status) {
            if (_response.status < 300) {
                if (this.data.resultHandler) {
                    handler = responses[this.data.resultHandler];
                    if (!handler) warn$1('Could not find ' + this.data.resultHandler + ' result handler');else handler.call(this, _response);
                } else {
                    responses.default.call(this, _response);
                }
            } else this.responseError(_response);
        } else if (_response.error) {
            this.error(_response.error);
        } else if (isArray(_response.errors)) {
            var self$$1 = this;
            _response.errors.forEach(function (error) {
                self$$1.inputError(error);
            });
        } else {
            if (this.data.resultHandler) {
                handler = responses[this.data.resultHandler];
                if (!handler) warn$1('Could not find ' + this.data.resultHandler + ' result handler');else handler.call(this, _response);
            } else {
                responses.default.call(this, _response);
            }
        }
    }
};

// Forms plugin
var index$4 = {

    install: function install(view) {
        view.addComponent('d3form', form);
        for (var key in view.providers) {
            providers$1[key] = view.providers[key];
        }
    },

    actions: actions,

    responses: responses
};

var label = function (el) {
    return this.wrapTemplate(el, labelTpl(this.data));
};

function labelTpl(data) {
    var label = data.label || data.name;

    return "<label for=" + data.id + " class=\"control-label\" d3-class=\"[required, labelSrOnly ? 'sr-only' : null]\">" + label + "</label>\n<slot></slot>";
}

var groupTpl = '<div class="form-group" d3-class=\'showError ? "has-danger" : null\'>\n<slot></slot>\n<p d3-if="showError" class="text-danger error-block" d3-html="error"></p>\n</div>';

var formGroup = function (el, formEl) {
    formEl.classed('form-control', true).attr('d3-class', 'showError ? "form-control-danger" : null');
    return this.wrapTemplate(el, groupTpl);
};

var inputGroup = function (el, formEl) {
    var ig = this.data['group'];
    if (!ig) return el;
    var gid = 'g' + formEl.attr('id');
    formEl.attr('aria-describedby', gid);
    return this.wrapTemplate(el, groupTpl$1(gid, ig));
};

function groupTpl$1(gid, group) {
    return '<div class="input-group" :class="bootstrapStatus()">\n<span class="input-group-addon" id="' + gid + '">' + group + '</span>\n<slot></slot>\n</div>';
}

var groupTpl$2 = '<div class="form-group">\n<slot></slot>\n</div>';

var submit$2 = function (el, formEl) {
    var theme = this.data.theme || 'primary';
    formEl.classed('btn', true).classed('btn-' + theme, true);
    return this.wrapTemplate(el, groupTpl$2);
};

var bootstrap = {

    input: ['inputGroup', 'label', 'formGroup'],
    textarea: ['label', 'formGroup'],
    select: ['label', 'formGroup'],
    submit: ['submit'],
    wrappers: {
        label: label,
        formGroup: formGroup,
        inputGroup: inputGroup,
        submit: submit$2
    }
};

// Bootstrap theme
var index$5 = {

    install: function install(view) {
        var d3form = view.components.get('d3form');
        if (d3form) d3form.prototype.formTheme = bootstrap;
    }
};

var version$1 = "0.1.9";

var version$2 = "0.1.3";

exports.version = version$2;
exports.bisect = bisectRight;
exports.bisectRight = bisectRight;
exports.bisectLeft = bisectLeft;
exports.ascending = ascending;
exports.bisector = bisector;
exports.descending = descending;
exports.deviation = deviation;
exports.extent = extent$1;
exports.histogram = histogram;
exports.thresholdFreedmanDiaconis = freedmanDiaconis;
exports.thresholdScott = scott;
exports.thresholdSturges = sturges;
exports.max = max;
exports.mean = mean;
exports.median = median;
exports.merge = merge;
exports.min = min;
exports.pairs = pairs;
exports.permute = permute;
exports.quantile = threshold;
exports.range = range;
exports.scan = scan;
exports.shuffle = shuffle;
exports.sum = sum;
exports.ticks = ticks;
exports.tickStep = tickStep;
exports.transpose = transpose;
exports.variance = variance;
exports.zip = zip;
exports.nest = nest;
exports.set = set$1;
exports.map = map$1;
exports.keys = keys$1;
exports.values = values$1;
exports.entries = entries$1;
exports.randomUniform = uniform;
exports.randomNormal = normal;
exports.randomLogNormal = logNormal;
exports.randomBates = bates;
exports.randomIrwinHall = irwinHall;
exports.randomExponential = exponential;
exports.easeLinear = linear;
exports.easeQuad = quadInOut;
exports.easeQuadIn = quadIn;
exports.easeQuadOut = quadOut;
exports.easeQuadInOut = quadInOut;
exports.easeCubic = cubicInOut;
exports.easeCubicIn = cubicIn;
exports.easeCubicOut = cubicOut;
exports.easeCubicInOut = cubicInOut;
exports.easePoly = polyInOut;
exports.easePolyIn = polyIn;
exports.easePolyOut = polyOut;
exports.easePolyInOut = polyInOut;
exports.easeSin = sinInOut;
exports.easeSinIn = sinIn;
exports.easeSinOut = sinOut;
exports.easeSinInOut = sinInOut;
exports.easeExp = expInOut;
exports.easeExpIn = expIn;
exports.easeExpOut = expOut;
exports.easeExpInOut = expInOut;
exports.easeCircle = circleInOut;
exports.easeCircleIn = circleIn;
exports.easeCircleOut = circleOut;
exports.easeCircleInOut = circleInOut;
exports.easeBounce = bounceOut;
exports.easeBounceIn = bounceIn;
exports.easeBounceOut = bounceOut;
exports.easeBounceInOut = bounceInOut;
exports.easeBack = backInOut;
exports.easeBackIn = backIn;
exports.easeBackOut = backOut;
exports.easeBackInOut = backInOut;
exports.easeElastic = elasticOut;
exports.easeElasticIn = elasticIn;
exports.easeElasticOut = elasticOut;
exports.easeElasticInOut = elasticInOut;
exports.polygonArea = area;
exports.polygonCentroid = centroid;
exports.polygonHull = hull;
exports.polygonContains = contains$1;
exports.polygonLength = length$1;
exports.path = path;
exports.quadtree = quadtree;
exports.arc = arc$1;
exports.area = area$1;
exports.line = line;
exports.pie = pie;
exports.radialArea = radialArea;
exports.radialLine = radialLine$1;
exports.symbol = symbol;
exports.symbols = symbols;
exports.symbolCircle = circle;
exports.symbolCross = cross$1;
exports.symbolDiamond = diamond;
exports.symbolSquare = square;
exports.symbolStar = star;
exports.symbolTriangle = triangle;
exports.symbolWye = wye;
exports.curveBasisClosed = basisClosed;
exports.curveBasisOpen = basisOpen;
exports.curveBasis = basis;
exports.curveBundle = bundle;
exports.curveCardinalClosed = cardinalClosed;
exports.curveCardinalOpen = cardinalOpen;
exports.curveCardinal = cardinal;
exports.curveCatmullRomClosed = catmullRomClosed;
exports.curveCatmullRomOpen = catmullRomOpen;
exports.curveCatmullRom = catmullRom;
exports.curveLinearClosed = linearClosed;
exports.curveLinear = curveLinear;
exports.curveMonotoneX = monotoneX;
exports.curveMonotoneY = monotoneY;
exports.curveNatural = natural;
exports.curveStep = step;
exports.curveStepAfter = stepAfter;
exports.curveStepBefore = stepBefore;
exports.stack = stack;
exports.stackOffsetExpand = expand;
exports.stackOffsetNone = none;
exports.stackOffsetSilhouette = silhouette;
exports.stackOffsetWiggle = wiggle;
exports.stackOrderAscending = ascending$1;
exports.stackOrderDescending = descending$2;
exports.stackOrderInsideOut = insideOut;
exports.stackOrderNone = none$1;
exports.stackOrderReverse = reverse;
exports.color = color;
exports.rgb = rgb$1;
exports.hsl = hsl;
exports.lab = lab;
exports.hcl = hcl;
exports.cubehelix = cubehelix;
exports.interpolate = interpolate;
exports.interpolateArray = array$1;
exports.interpolateBasis = basis$2;
exports.interpolateBasisClosed = basisClosed$1;
exports.interpolateDate = date;
exports.interpolateNumber = interpolateNumber;
exports.interpolateObject = object$1;
exports.interpolateRound = interpolateRound;
exports.interpolateString = interpolateString;
exports.interpolateTransformCss = interpolateTransformCss;
exports.interpolateTransformSvg = interpolateTransformSvg;
exports.interpolateZoom = interpolateZoom;
exports.interpolateRgb = interpolateRgb;
exports.interpolateRgbBasis = rgbBasis;
exports.interpolateRgbBasisClosed = rgbBasisClosed;
exports.interpolateHsl = hsl$2;
exports.interpolateHslLong = hslLong;
exports.interpolateLab = lab$1;
exports.interpolateHcl = hcl$2;
exports.interpolateHclLong = hclLong;
exports.interpolateCubehelix = cubehelix$2;
exports.interpolateCubehelixLong = cubehelixLong;
exports.quantize = quantize;
exports.dispatch = dispatch;
exports.dsvFormat = dsv;
exports.csvParse = csvParse;
exports.csvParseRows = csvParseRows;
exports.csvFormat = csvFormat;
exports.csvFormatRows = csvFormatRows;
exports.tsvParse = tsvParse;
exports.tsvParseRows = tsvParseRows;
exports.tsvFormat = tsvFormat;
exports.tsvFormatRows = tsvFormatRows;
exports.now = now;
exports.timer = timer;
exports.timerFlush = timerFlush;
exports.timeout = timeout$1;
exports.interval = interval$1;
exports.timeInterval = newInterval;
exports.timeMillisecond = millisecond;
exports.timeMilliseconds = milliseconds;
exports.utcMillisecond = millisecond;
exports.utcMilliseconds = milliseconds;
exports.timeSecond = second;
exports.timeSeconds = seconds;
exports.utcSecond = second;
exports.utcSeconds = seconds;
exports.timeMinute = minute;
exports.timeMinutes = minutes;
exports.timeHour = hour;
exports.timeHours = hours;
exports.timeDay = day;
exports.timeDays = days;
exports.timeWeek = sunday;
exports.timeWeeks = sundays;
exports.timeSunday = sunday;
exports.timeSundays = sundays;
exports.timeMonday = monday;
exports.timeMondays = mondays;
exports.timeTuesday = tuesday;
exports.timeTuesdays = tuesdays;
exports.timeWednesday = wednesday;
exports.timeWednesdays = wednesdays;
exports.timeThursday = thursday;
exports.timeThursdays = thursdays;
exports.timeFriday = friday;
exports.timeFridays = fridays;
exports.timeSaturday = saturday;
exports.timeSaturdays = saturdays;
exports.timeMonth = month;
exports.timeMonths = months;
exports.timeYear = year;
exports.timeYears = years;
exports.utcMinute = utcMinute;
exports.utcMinutes = utcMinutes;
exports.utcHour = utcHour;
exports.utcHours = utcHours;
exports.utcDay = utcDay;
exports.utcDays = utcDays;
exports.utcWeek = utcSunday;
exports.utcWeeks = utcSundays;
exports.utcSunday = utcSunday;
exports.utcSundays = utcSundays;
exports.utcMonday = utcMonday;
exports.utcMondays = utcMondays;
exports.utcTuesday = utcTuesday;
exports.utcTuesdays = utcTuesdays;
exports.utcWednesday = utcWednesday;
exports.utcWednesdays = utcWednesdays;
exports.utcThursday = utcThursday;
exports.utcThursdays = utcThursdays;
exports.utcFriday = utcFriday;
exports.utcFridays = utcFridays;
exports.utcSaturday = utcSaturday;
exports.utcSaturdays = utcSaturdays;
exports.utcMonth = utcMonth;
exports.utcMonths = utcMonths;
exports.utcYear = utcYear;
exports.utcYears = utcYears;
exports.formatDefaultLocale = defaultLocale;
exports.formatLocale = formatLocale;
exports.formatSpecifier = formatSpecifier;
exports.precisionFixed = precisionFixed;
exports.precisionPrefix = precisionPrefix;
exports.precisionRound = precisionRound;
exports.timeFormatDefaultLocale = defaultLocale$1;
exports.timeFormatLocale = formatLocale$1;
exports.isoFormat = formatIso;
exports.isoParse = parseIso;
exports.scaleBand = band;
exports.scalePoint = point$1;
exports.scaleIdentity = identity$4;
exports.scaleLinear = linear$2;
exports.scaleLog = log;
exports.scaleOrdinal = ordinal;
exports.scaleImplicit = implicit;
exports.scalePow = pow;
exports.scaleSqrt = sqrt;
exports.scaleQuantile = quantile$$1;
exports.scaleQuantize = quantize$1;
exports.scaleThreshold = threshold$1;
exports.scaleTime = time;
exports.scaleUtc = utcTime;
exports.schemeCategory10 = category10;
exports.schemeCategory20b = category20b;
exports.schemeCategory20c = category20c;
exports.schemeCategory20 = category20;
exports.interpolateCubehelixDefault = cubehelix$3;
exports.interpolateRainbow = rainbow$1;
exports.interpolateWarm = warm;
exports.interpolateCool = cool;
exports.interpolateViridis = viridis;
exports.interpolateMagma = magma;
exports.interpolateInferno = inferno;
exports.interpolatePlasma = plasma;
exports.scaleSequential = sequential;
exports.creator = creator;
exports.local = local;
exports.matcher = matcher$1;
exports.mouse = mouse;
exports.namespace = namespace;
exports.namespaces = namespaces;
exports.select = select;
exports.selectAll = selectAll;
exports.selection = selection;
exports.selector = selector;
exports.selectorAll = selectorAll;
exports.touch = touch;
exports.touches = touches;
exports.window = window$1;
exports.customEvent = customEvent;
exports.transition = transition;
exports.active = active;
exports.interrupt = interrupt;
exports.axisTop = axisTop;
exports.axisRight = axisRight;
exports.axisBottom = axisBottom;
exports.axisLeft = axisLeft;
exports.cluster = cluster;
exports.hierarchy = hierarchy;
exports.pack = index;
exports.packSiblings = siblings;
exports.packEnclose = enclose;
exports.partition = partition;
exports.stratify = stratify;
exports.tree = tree;
exports.treemap = index$1;
exports.treemapBinary = binary;
exports.treemapDice = treemapDice;
exports.treemapSlice = treemapSlice;
exports.treemapSliceDice = sliceDice;
exports.treemapSquarify = squarify;
exports.treemapResquarify = resquarify;
exports.drag = drag;
exports.dragDisable = dragDisable;
exports.dragEnable = yesdrag;
exports.voronoi = voronoi;
exports.zoom = zoom;
exports.zoomTransform = transform;
exports.zoomIdentity = identity$6;
exports.brush = brush;
exports.brushX = brushX;
exports.brushY = brushY;
exports.brushSelection = brushSelection;
exports.chord = chord;
exports.ribbon = ribbon;
exports.geoArea = area$2;
exports.geoBounds = bounds;
exports.geoCentroid = centroid$1;
exports.geoCircle = circle$1;
exports.geoClipExtent = extent$2;
exports.geoDistance = distance;
exports.geoGraticule = graticule;
exports.geoGraticule10 = graticule10;
exports.geoInterpolate = interpolate$2;
exports.geoLength = length$2;
exports.geoPath = index$2;
exports.geoAlbers = albers;
exports.geoAlbersUsa = albersUsa;
exports.geoAzimuthalEqualArea = azimuthalEqualArea;
exports.geoAzimuthalEqualAreaRaw = azimuthalEqualAreaRaw;
exports.geoAzimuthalEquidistant = azimuthalEquidistant;
exports.geoAzimuthalEquidistantRaw = azimuthalEquidistantRaw;
exports.geoConicConformal = conicConformal;
exports.geoConicConformalRaw = conicConformalRaw;
exports.geoConicEqualArea = conicEqualArea;
exports.geoConicEqualAreaRaw = conicEqualAreaRaw;
exports.geoConicEquidistant = conicEquidistant;
exports.geoConicEquidistantRaw = conicEquidistantRaw;
exports.geoEquirectangular = equirectangular;
exports.geoEquirectangularRaw = equirectangularRaw;
exports.geoGnomonic = gnomonic;
exports.geoGnomonicRaw = gnomonicRaw;
exports.geoIdentity = identity$8;
exports.geoProjection = projection;
exports.geoProjectionMutator = projectionMutator;
exports.geoMercator = mercator;
exports.geoMercatorRaw = mercatorRaw;
exports.geoOrthographic = orthographic;
exports.geoOrthographicRaw = orthographicRaw;
exports.geoStereographic = stereographic;
exports.geoStereographicRaw = stereographicRaw;
exports.geoTransverseMercator = transverseMercator;
exports.geoTransverseMercatorRaw = transverseMercatorRaw;
exports.geoRotation = rotation;
exports.geoStream = geoStream;
exports.geoTransform = transform$1;
exports.view = index$3;
exports.viewModel = model;
exports.viewExpression = viewExpression;
exports.viewReady = dom;
exports.viewProviders = providers;
exports.viewWarn = warn;
exports.viewForms = index$4;
exports.viewBootstrapForms = index$5;
exports.viewVersion = version$1;
exports.viewElement = htmlElement;
exports.viewTemplate = compile$1;
exports.viewHtml = html$1;

Object.defineProperty(exports, '__esModule', { value: true });

})));