@flourish/controls/controls.js

(function (global, factory) {
	typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
	typeof define === 'function' && define.amd ? define(['exports'], factory) :
	(factory((global.controls = global.controls || {})));
}(this, (function (exports) { 'use strict';

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 matcher = function(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(selector) {
      return function() {
        return vendorMatches.call(this, selector);
      };
    };
  }
}

var matcher$1 = matcher;

var filterEvents = {};

var 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 = event; // Events can be reentrant (e.g., focus).
    event = event1;
    try {
      listener.call(this, this.__data__, index, group);
    } finally {
      event = event0;
    }
  };
}

function parseTypenames(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(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;
};

var sourceEvent = function() {
  var current = event, source;
  while (source = current.sourceEvent) current = source;
  return current;
};

var point = 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 d3_mouse = function(node) {
  var event = sourceEvent();
  if (event.changedTouches) event = event.changedTouches[0];
  return point(node, event);
};

function none() {}

var selector = function(selector) {
  return selector == null ? none : 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() {
  return [];
}

var selectorAll = function(selector) {
  return selector == null ? empty : 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(child) { return this._parent.insertBefore(child, this._next); },
  insertBefore: function(child, next) { return this._parent.insertBefore(child, next); },
  querySelector: function(selector) { return this._parent.querySelector(selector); },
  querySelectorAll: function(selector) { return this._parent.querySelectorAll(selector); }
};

var constant = 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(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;

  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(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 defaultView = 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) {
  return arguments.length > 1
      ? this.each((value == null
            ? styleRemove : typeof value === "function"
            ? styleFunction
            : styleConstant)(name, value, priority == null ? "" : priority))
      : styleValue(this.node(), name);
};

function styleValue(node, name) {
  return node.style.getPropertyValue(name)
      || defaultView(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(name) {
    var i = this._names.indexOf(name);
    if (i < 0) {
      this._names.push(name);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  remove: function(name) {
    var i = this._names.indexOf(name);
    if (i >= 0) {
      this._names.splice(i, 1);
      this._node.setAttribute("class", this._names.join(" "));
    }
  },
  contains: function(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() {
  if (this.nextSibling) this.parentNode.appendChild(this);
}

var selection_raise = function() {
  return this.each(raise);
};

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() {
  var parent = this.parentNode;
  if (parent) parent.removeChild(this);
}

var selection_remove = function() {
  return this.each(remove);
};

var selection_datum = function(value) {
  return arguments.length
      ? this.property("__data__", value)
      : this.node().__data__;
};

function dispatchEvent(node, type, params) {
  var window = defaultView(node),
      event = window.CustomEvent;

  if (typeof event === "function") {
    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 d3_select = function(selector) {
  return typeof selector === "string"
      ? new Selection([[document.querySelector(selector)]], [document.documentElement])
      : new Selection([[selector]], root);
};

var slice = Array.prototype.slice;

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

var top = 1;
var right = 2;
var bottom = 3;
var left = 4;
var epsilon = 1e-6;

function translateX(x) {
  return "translate(" + (x + 0.5) + ",0)";
}

function translateY(y) {
  return "translate(0," + (y + 0.5) + ")";
}

function number(scale) {
  return function(d) {
    return +scale(d);
  };
}

function center(scale) {
  var offset = Math.max(0, scale.bandwidth() - 1) / 2; // Adjust for 0.5px offset.
  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,
      k = orient === top || orient === left ? -1 : 1,
      x = orient === left || orient === right ? "x" : "y",
      transform = orient === top || orient === bottom ? translateX : translateY;

  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) : tickFormat,
        spacing = Math.max(tickSizeInner, 0) + tickPadding,
        range = scale.range(),
        range0 = +range[0] + 0.5,
        range1 = +range[range.length - 1] + 0.5,
        position = (scale.bandwidth ? center : number)(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");

    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));

    text = text.merge(tickEnter.append("text")
        .attr("fill", "#000")
        .attr(x, k * spacing)
        .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)
          .attr("transform", function(d) { return isFinite(d = position(d)) ? transform(d) : this.getAttribute("transform"); });

      tickEnter
          .attr("opacity", epsilon)
          .attr("transform", function(d) { var p = this.parentNode.__axis; return transform(p && isFinite(p = p(d)) ? p : position(d)); });
    }

    tickExit.remove();

    path
        .attr("d", orient === left || orient == right
            ? "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(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 ? "start" : orient === left ? "end" : "middle");

    selection
        .each(function() { this.__axis = position; });
  }

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

  axis.ticks = function() {
    return tickArguments = slice.call(arguments), axis;
  };

  axis.tickArguments = function(_) {
    return arguments.length ? (tickArguments = _ == null ? [] : slice.call(_), axis) : tickArguments.slice();
  };

  axis.tickValues = function(_) {
    return arguments.length ? (tickValues = _ == null ? null : slice.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 axisBottom(scale) {
  return axis(bottom, scale);
}

var ascending$1 = 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(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(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$1(f(d), x);
  };
}

var ascendingBisect = bisector(ascending$1);
var bisectRight = ascendingBisect.right;

function pair(a, b) {
  return [a, b];
}

var number$1 = function(x) {
  return x === null ? NaN : +x;
};

var extent = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min,
      max;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = max = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null) {
            if (min > value) min = value;
            if (max < value) max = value;
          }
        }
      }
    }
  }

  return [min, max];
};

var identity$1 = 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 reverse,
      i = -1,
      n,
      ticks,
      step;

  stop = +stop, start = +start, count = +count;
  if (start === stop && count > 0) return [start];
  if (reverse = stop < start) n = start, start = stop, stop = n;
  if ((step = tickIncrement(start, stop, count)) === 0 || !isFinite(step)) return [];

  if (step > 0) {
    start = Math.ceil(start / step);
    stop = Math.floor(stop / step);
    ticks = new Array(n = Math.ceil(stop - start + 1));
    while (++i < n) ticks[i] = (start + i) * step;
  } else {
    start = Math.floor(start * step);
    stop = Math.ceil(stop * step);
    ticks = new Array(n = Math.ceil(start - stop + 1));
    while (++i < n) ticks[i] = (start - i) / step;
  }

  if (reverse) ticks.reverse();

  return ticks;
};

function tickIncrement(start, stop, count) {
  var step = (stop - start) / Math.max(0, count),
      power = Math.floor(Math.log(step) / Math.LN10),
      error = step / Math.pow(10, power);
  return power >= 0
      ? (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1) * Math.pow(10, power)
      : -Math.pow(10, -power) / (error >= e10 ? 10 : error >= e5 ? 5 : error >= e2 ? 2 : 1);
}

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 quantile = function(values, p, valueof) {
  if (valueof == null) valueof = number$1;
  if (!(n = values.length)) return;
  if ((p = +p) <= 0 || n < 2) return +valueof(values[0], 0, values);
  if (p >= 1) return +valueof(values[n - 1], n - 1, values);
  var n,
      i = (n - 1) * p,
      i0 = Math.floor(i),
      value0 = +valueof(values[i0], i0, values),
      value1 = +valueof(values[i0 + 1], i0 + 1, values);
  return value0 + (value1 - value0) * (i - i0);
};

var min = function(values, valueof) {
  var n = values.length,
      i = -1,
      value,
      min;

  if (valueof == null) {
    while (++i < n) { // Find the first comparable value.
      if ((value = values[i]) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = values[i]) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  else {
    while (++i < n) { // Find the first comparable value.
      if ((value = valueof(values[i], i, values)) != null && value >= value) {
        min = value;
        while (++i < n) { // Compare the remaining values.
          if ((value = valueof(values[i], i, values)) != null && min > value) {
            min = value;
          }
        }
      }
    }
  }

  return min;
};

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

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() {
    return this.rgb().displayable();
  },
  toString: function() {
    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(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, extend(Color, {
  brighter: function(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(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() {
    return this;
  },
  displayable: function() {
    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() {
    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(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Hsl(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function() {
    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() {
    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(k) {
    return new Lab(this.l + Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  darker: function(k) {
    return new Lab(this.l - Kn * (k == null ? 1 : k), this.a, this.b, this.opacity);
  },
  rgb: function() {
    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(k) {
    return new Hcl(this.h, this.c, this.l + Kn * (k == null ? 1 : k), this.opacity);
  },
  darker: function(k) {
    return new Hcl(this.h, this.c, this.l - Kn * (k == null ? 1 : k), this.opacity);
  },
  rgb: function() {
    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(k) {
    k = k == null ? brighter : Math.pow(brighter, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  darker: function(k) {
    k = k == null ? darker : Math.pow(darker, k);
    return new Cubehelix(this.h, this.s, this.l * k, this.opacity);
  },
  rgb: function() {
    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(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 constant$2 = function(x) {
  return function() {
    return x;
  };
};

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

function exponential(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$2(isNaN(a) ? b : a);
}

function gamma(y) {
  return (y = +y) === 1 ? nogamma : function(a, b) {
    return b - a ? exponential(a, b, y) : constant$2(isNaN(a) ? b : a);
  };
}

function nogamma(a, b) {
  var d = b - a;
  return d ? linear$1(a, d) : constant$2(isNaN(a) ? b : a);
}

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

  function rgb$$1(start, end) {
    var r = color$$1((start = rgb(start)).r, (end = rgb(end)).r),
        g = color$$1(start.g, end.g),
        b = color$$1(start.b, end.b),
        opacity = nogamma(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);

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] = interpolateValue(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 number$2 = function(a, b) {
  return a = +a, b -= a, function(t) {
    return a + b * t;
  };
};

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

  if (a === null || typeof a !== "object") a = {};
  if (b === null || typeof b !== "object") b = {};

  for (k in b) {
    if (k in a) {
      i[k] = interpolateValue(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 string = 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: number$2(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 interpolateValue = function(a, b) {
  var t = typeof b, c;
  return b == null || t === "boolean" ? constant$2(b)
      : (t === "number" ? number$2
      : t === "string" ? ((c = color(b)) ? (b = c, rgb$1) : string)
      : b instanceof color ? rgb$1
      : b instanceof Date ? date
      : Array.isArray(b) ? array$1
      : typeof b.valueOf !== "function" && typeof b.toString !== "function" || isNaN(b) ? object
      : number$2)(a, b);
};

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

// p0 = [ux0, uy0, w0]
// p1 = [ux1, uy1, w1]

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);
}

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

var array$2 = Array.prototype;

var map$1 = array$2.map;
var slice$2 = array$2.slice;

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

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

var unit = [0, 1];

function deinterpolateLinear(a, b) {
  return (b -= (a = +a))
      ? function(x) { return (x - a) / b; }
      : constant$3(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 = interpolateValue,
      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$1.call(_, number$3), 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();
}

// 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 = 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 formatNumerals = function(numerals) {
  return function(value) {
    return value.replace(/[0-9]/g, function(i) {
      return numerals[+i];
    });
  };
};

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

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

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

formatSpecifier.prototype = FormatSpecifier.prototype; // instanceof

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

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

var formatLocale = function(locale) {
  var group = locale.grouping && locale.thousands ? formatGroup(locale.grouping, locale.thousands) : identity$3,
      currency = locale.currency,
      decimal = locale.decimal,
      numerals = locale.numerals ? formatNumerals(locale.numerals) : identity$3,
      percent = locale.percent || "%";

  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) ? percent : "";

    // 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;

        // Perform the initial formatting.
        var valueNegative = value < 0;
        value = formatType(Math.abs(value), precision);

        // If a negative value rounds to zero during formatting, treat as positive.
        if (valueNegative && +value === 0) valueNegative = false;

        // 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 "<": value = valuePrefix + value + valueSuffix + padding; break;
        case "=": value = valuePrefix + padding + value + valueSuffix; break;
        case "^": value = padding.slice(0, length = padding.length >> 1) + valuePrefix + value + valueSuffix + padding.slice(length); break;
        default: value = padding + valuePrefix + value + valueSuffix; break;
      }

      return numerals(value);
    }

    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(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;
var format;
var formatPrefix;

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

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

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

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

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

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 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 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) {
    if (count == null) count = 10;

    var d = domain(),
        i0 = 0,
        i1 = d.length - 1,
        start = d[i0],
        stop = d[i1],
        step;

    if (stop < start) {
      step = start, start = stop, stop = step;
      step = i0, i0 = i1, i1 = step;
    }

    step = tickIncrement(start, stop, count);

    if (step > 0) {
      start = Math.floor(start / step) * step;
      stop = Math.ceil(stop / step) * step;
      step = tickIncrement(start, stop, count);
    } else if (step < 0) {
      start = Math.ceil(start * step) / step;
      stop = Math.floor(stop * step) / step;
      step = tickIncrement(start, stop, count);
    }

    if (step > 0) {
      d[i0] = Math.floor(start / step) * step;
      d[i1] = Math.ceil(stop / step) * step;
      domain(d);
    } else if (step < 0) {
      d[i0] = Math.ceil(start * step) / step;
      d[i1] = Math.floor(stop * step) / step;
      domain(d);
    }

    return scale;
  };

  return scale;
}

function linear() {
  var scale = continuous(deinterpolateLinear, number$2);

  scale.copy = function() {
    return copy(scale, linear());
  };

  return linearish(scale);
}

// We’re importing from an individual file rather than the top level of the d3-scale
// module to work around a tree-shaking issue that otherwise causes a lot of irrelevant
// d3-scale code to be pulled into the “full” build. See issues:
//
// https://github.com/rollup/rollup/issues/305
// https://github.com/rollup/rollup/issues/1208
//
// There are some associated shenanigans in rollup.config.js to accommodate this.
//
// If and when rollup manages to avoid this problem, we can revert back to the
// straightforward approach.
var VERSION = "1.3.1";

function Slider(selector$$1) {
	this.container = d3_select(selector$$1);

	this._width = null;
	this._height = null;

	this._handleRadius = 15;
	this._channelHeight = 5;
	this._channelRadius = null;

	this._handleFill = "black";
	this._channelFill = "#eee";

	this._margin = { top: null, left: null, right: null };

	this._domain = [0,1];
	this._value = null;
	this._snap = false;

	this._scale = null;
	this._axis = false;
	this._ticks = null;
	this._tickFormat = null;
	this._tickSize = null;

	this._label = null;
	this._labelSize = 18;

	this._startLabel = null;
	this._startLabelBelow = false;

	this._endLabel = null;
	this._endLabelBelow = false;

	this._startEndLabelSize = 16;

	this.handlers = { "change": [] };
}

// Create accessor methods for all the _parameters defined by the constructor
function accessor(k) {
	if (k.length > 0 && k.charAt(0) == "_") {
		Slider.prototype[k.substr(1)] = function(v) {
			if (typeof v == "undefined") return this[k];
			this[k] = v;
			return this;
		};
	}
}
var s = new Slider();
for (var k in s) {
	accessor(k);
}

// Special accessor function for margin
Slider.prototype.margin = function Slider_margin(options) {
	if (!options) return this._margin;
	for (k in options) {
		if (k in this._margin) this._margin[k] = options[k];
		else throw "Slider.margin: unrecognised option " + k;
	}
	return this;
};

// Attach event handlers
Slider.prototype.on = function Slider_on(event$$1, handler) {
	if (!(event$$1 in this.handlers)) throw "Slider.on: No such event: " + event$$1;
	this.handlers[event$$1].push(handler);
	return this;
};

// Fire event
Slider.prototype.fire = function Slider_fire(event$$1, d) {
	if (!(event$$1 in this.handlers)) throw "Slider.fire: No such event: " + event$$1;
	var handlers = this.handlers[event$$1];
	for (var i = 0; i < handlers.length; i++) {
		handlers[i].call(this, d);
	}
	return this;
};

// Binary search
function closestValue(sorted_list, value, a, b) {
	if (typeof a === "undefined") a = 0;
	if (typeof b === "undefined") b = sorted_list.length;

	if (b-a == 0) return value;
	if (b-a == 1) return sorted_list[a];
	if (b-a == 2) {
		var d1 = Math.abs(sorted_list[a] - value),
		    d2 = Math.abs(sorted_list[a+1] - value);
		if (d1 <= d2) return sorted_list[a];
		else return sorted_list[a+1];
	}

	var mid = a + Math.floor((b-a) / 2),
	    mid_v = sorted_list[mid];
	    pre = mid - 1,
	    pre_v = sorted_list[pre];
	if (pre_v <= value && value <= mid_v) {
		return (Math.abs(pre_v - value) <= Math.abs(mid_v - value)) ? pre_v : mid_v;
	}
	if (mid_v <= value) return closestValue(sorted_list, value, mid, b);
	else return closestValue(sorted_list, value, a, mid);
}

function snapTo(specification, value) {
	if (typeof specification == "boolean") {
		return specification ? Math.round(value) : value;
	}
	// Otherwise assume “specification” is a sorted array
	return closestValue(specification, value);
}

// Draw or update the slider
Slider.prototype.draw = function Slider_draw() {
	var that = this;

	var cw = this._width,
	    ch = this._height;

	var container_node = this.container.node();

	// If the width and height have not been specified, use
	// the client size of the container element.
	if (!cw) {
		var r = container_node.getBoundingClientRect();
		// If there isn’t a bounding client rect, e.g. because
		// the container is display: none;, then do nothing.
		if (!r || r.width == 0) return this;

		cw = r.width;
		ch = r.height;
	}

	var channel_r = this._channelRadius == null ? this._channelHeight/2 : this._channelRadius,
	    left_margin = (this._margin.left == null ? Math.max(this._handleRadius, channel_r) : this._margin.left),
	    right_margin = (this._margin.right == null ? Math.max(this._handleRadius, channel_r) : this._margin.right),
	    top_margin = this._margin.top == null ? Math.max(this._handleRadius, this._channelHeight/2) : this._margin.top,
	    w = cw - left_margin - right_margin, // Inner width of the slider channel (excluding endcaps)
	    channel_w = w + 2*channel_r, // Width of the slider channel (including endcaps)
	    label_h = this._labelSize * 1.5;

	if (this._label != null && this._margin.top == null) top_margin += label_h;

	var slider;
	if (container_node.namespaceURI == "http://www.w3.org/2000/svg") {
		slider = this.container;
	}
	else {
		slider = this.container.selectAll("svg").data([{ width: cw, height: ch }]);
		slider.exit().remove();
		slider = slider.enter().append("svg").merge(slider);
		slider.attr("width", function(d) { return d.width; })
			.attr("height", function(d) { return d.height; });
	}

	var g = slider.selectAll("g.slider-container").data([{left: left_margin, top: top_margin, id: this._id}]);
	g.exit().remove();
	g = g.enter().append("g").attr("class", "slider-container").merge(g);
	g.attr("transform", function(d) {
			return "translate(" + d.left + "," + d.top + ")";
		})
		.attr("id", function(d) { return d.id; });

	this.scale = (this._scale ? this._scale() : linear()).domain(this._domain).range([0, w]);

	if (this._value == null || this._value < this._domain[0]) this._value = this._domain[0];
	else if (this._value > this._domain[1]) this._value = this._domain[1];

	if (this._snap) this._value = snapTo(this._snap, this._value);

	var axes_data = [];
	if (this._axis) {
		var axis;
		if (typeof this._axis != "boolean") {
			axis = this._axis(this.scale);
		}
		else {
			axis = axisBottom().scale(this.scale).tickPadding(6);
		}

		if (this._ticks) axis.ticks(this._ticks);
		if (this._tickFormat) axis.tickFormat(this._tickFormat);
		if (this._tickSize) axis.tickSize(this._tickSize);
		else axis.tickSize(Math.max(5, this._handleRadius - this._channelHeight - 2));
		axes_data.push(axis);
	}

	var axes = g.selectAll(".slider-axis");
	var axes_enter = axes.data(axes_data).enter();
	axes_enter.append("g").attr("class", "slider-axis")
		.attr("transform", "translate(" + 0 + "," + this._channelHeight/2 + ")")
		.each(function(axis) { axis(d3_select(this)); });
	axes_enter.select(".domain").attr("fill", "none");
	axes_enter.selectAll(".tick line").attr("stroke", "black");
	axes_enter.exit().remove();

	var channel, handle;
	channel = g.selectAll(".slider-channel")
		.data([{ width: channel_w, height: this._channelHeight, channel_r: channel_r }]);
	channel.exit().remove();

	channel = channel.enter().append("rect").attr("class", "slider-channel")
		.attr("fill", this._channelFill)
		.attr("cursor", "pointer")
		.on("click", function() {
			var slider_x = Math.max(0, Math.min(w, d3_mouse(this)[0]));
			that._value = that.scale.invert(slider_x);
			if (that._snap) that._value = snapTo(that._snap, that._value);
			handle.attr("cx", that.scale(that._value));
			that.fire("change", that._value);
		})
		.merge(channel);

	channel.attr("width", function(d) { return d.width; })
		.attr("height", function(d) { return d.height; })
		.attr("y", function(d) { return -d.height/2; })
		.attr("x", function(d){ return -d.channel_r; })
		.attr("rx", function(d) { return d.channel_r; });

	var drag_dx_origin, drag_x_origin;
	function handleMousedown(event$$1) {
		document.addEventListener("mouseup", handleMouseup, false);
		document.addEventListener("mousemove", handleMousemove, false);
		drag_dx_origin = event$$1.clientX;
		drag_x_origin = that.scale(that._value);
	}

	function handleMouseup() {
		document.removeEventListener("mouseup", handleMouseup, false);
		document.removeEventListener("mousemove", handleMousemove, false);
	}

	function handleMousemove(event$$1) {
		drag(event$$1.clientX - drag_dx_origin);
	}

	function handleTouchstart(event$$1) {
		if (event$$1.touches.length != 1) return;
		document.addEventListener("touchend", handleTouchend, false);
		document.addEventListener("touchmove", handleTouchmove, false);
		drag_dx_origin = event$$1.touches[0].clientX;
		drag_x_origin = that.scale(that._value);
	}

	function handleTouchend() {
		document.removeEventListener("touchend", handleTouchend, false);
		document.removeEventListener("touchmove", handleTouchmove, false);
	}

	function handleTouchmove(event$$1) {
		if (event$$1.touches.length != 1) return;
		drag(event$$1.touches[0].clientX - drag_dx_origin);
	}

	function drag(dx) {
		var new_x = drag_x_origin + dx;
		var slider_x = Math.max(0, Math.min(w, new_x));
		var new_value = that.scale.invert(slider_x);
		if (that._snap) new_value = snapTo(that._snap, new_value);
		handle.attr("cx", that.scale(new_value));
		if (new_value != that._value) {
			that._value = new_value;
			that.fire("change", that._value);
		}
	}

	handle = g.selectAll(".slider-handle").data([{ v: this._value, x: this.scale(this._value) }]);
	handle = handle.enter().append("circle").attr("class", "slider-handle")
		.attr("cursor", "col-resize")
		.merge(handle);

	handle.attr("cx", function(d) { return d.x; })
		.attr("r", this._handleRadius)
		.attr("fill", this._handleFill)
		.on("mousedown", function() {
			event.preventDefault();
			handleMousedown(event);
		})
		.on("touchstart", function() {
			event.preventDefault();
			handleTouchstart(event);
		});

	var label_data = [];
	if (this._label) {
		label_data.push({
			label: this._label, x: w/2, y: -label_h, font_size: this._labelSize
		});
	}
	var label = g.selectAll(".slider-label").data(label_data);
	label.exit().remove();
	label = label.enter()
		.append("text").attr("class", "slider-label")
		.attr("text-anchor", "middle")
		.attr("cursor", "default")
		.merge(label);

	label
		.text(function(d) { return d.label; })
		.attr("x", function(d) { return d.x; })
		.attr("y", function(d) { return d.y; })
		.attr("font-size", this._labelSize);

	var end_label_data = [];
	if (this._startLabel) {
		end_label_data.push({
			label: this._startLabel,
				x: this._startLabelBelow ? 0 : -(channel_r + 5 + Math.max(0, this._handleRadius - channel_r)),
				y: this._startLabelBelow ? (channel_r + 15) : this._startEndLabelSize/1.75 - channel_r/2,
				anchor: this._startLabelBelow ? "middle" : "end",
				font_size: this._startEndLabelSize
		});
	}
	if (this._endLabel) {
		end_label_data.push({
			label: this._endLabel,
				x: this._endLabelBelow ? w : w + (channel_r + Math.max(0, this._handleRadius - channel_r) + 5),
				y: this._startLabelBelow ? (channel_r + 15) : this._startEndLabelSize/1.75 - channel_r/2,
				anchor: this._endLabelBelow ? "middle" : "start",
				font_size: this._startEndLabelSize
		});
	}

	var end_labels = g.selectAll(".slider-end-labels").data(end_label_data);
	end_labels.exit().remove();
	end_labels = end_labels.enter().append("text").attr("class", "slider-end-labels")
		.attr("pointer-events", "none")
		.merge(end_labels);
	end_labels
		.text(function(d) { return d.label; })
		.attr("font-size", function(d) { return d.font_size; })
		.attr("x", function(d) { return d.x; })
		.attr("y", function(d) { return d.y; })
		.attr("text-anchor", function(d) { return d.anchor; });

	return this;
};

Slider.prototype.update = Slider.prototype.draw;

function Flourish_slider(selector$$1) {
	return new Slider(selector$$1);
}
Flourish_slider.version = VERSION;

var css_string = ".controls-container,.controls-container *{box-sizing:border-box}.btn-group .btn,.dropdown .current{overflow:hidden;text-overflow:ellipsis;height:100%;white-space:nowrap}.btn-group .btn,.dropdown .current,.dropdown .list .list-item{white-space:nowrap}.slider,.slider-play{pointer-events:all;vertical-align:bottom}.btn{display:inline-block;cursor:pointer}.btn:hover{opacity:.5}.btn.selected,.btn.selected:hover{color:#fff;cursor:default;opacity:1;background-image:linear-gradient(transparent,rgba(0,0,0,.05) 40%,rgba(0,0,0,.1))}.btn-group{background:#fff;border-radius:3px;display:table;border:1px solid rgba(0,0,0,.5);box-shadow:2px 2px 5px rgba(0,0,0,.5);pointer-events:all;width:100%;table-layout:fixed}.btn-group .btn{font-size:.9em;border-left:1px solid rgba(0,0,0,.5);padding:2px 8px;color:#000;font-weight:400;display:table-cell;text-align:center}.btn-group .btn:hover{background:#dedede;opacity:.8}.btn-group .btn:first-child{border:none}.btn-group .btn.selected,.btn-group .btn.selected:hover{opacity:1;background:#888;color:#fff}.dropdown{pointer-events:all;display:inline-table;color:#000;font-weight:400;font-size:16px;position:relative}.dropdown .heading{margin-bottom:.4em;font-weight:300}.dropdown .main{background:#fff;padding:4px 40px 4px 8px;cursor:pointer;position:relative;border:1px solid #000}.dropdown .list,.dropdown .symbol{position:absolute;border:1px solid #000}.dropdown .current{flex:1 1 auto;width:100%;display:inline-block}.dropdown .symbol{width:30px;height:100%;right:0;top:0;background:50% 40% no-repeat #000;background-size:80%;display:inline-block}.dropdown .list{top:100%;left:-1px;min-width:calc(100% + 2px);background:rgba(255,255,255,1);padding:.2em .4em;text-align:left;display:none;line-height:1.4em;max-height:160px;overflow-y:scroll;color:#000}.dropdown .list .list-item:hover{opacity:.5;cursor:pointer}.dropdown.open .list{display:block;z-index:1}.dropdown .list .list-item.selected,.dropdown .list .list-item.selected:hover{color:#57c1fc;cursor:default;opacity:1}.dropdown .list .list-item.header,.dropdown .list .list-item.header:hover{font-size:.66em;letter-spacing:1px;text-transform:uppercase;color:#888;opacity:1;cursor:default;font-weight:300;margin-top:.5em}.dropdown .list .list-item.header:first-child{margin-top:0}.controls-container .dropdown{margin:0 0 1.5em}.controls-container .dropdown .heading{color:#fff}.slider-holder{margin-bottom:25px}.slider-play{width:2em;height:2em;background-repeat:no-repeat;background-size:100% 100%;cursor:pointer;display:none}.slider,.slider-holder.animatable .slider-play{display:inline-block}.slider-play:hover{opacity:.7}.slider{height:64px;width:100%;bottom:0}.slider-holder.animatable .slider{width:calc(100% - 37px)}.slider-holder.playing .slider{pointer-events:none}.slider circle{fill:#57c1fc}.slider .tick line{stroke:#fff}.slider text{fill:#fff}.slider .slider-label{font-size:17px}.slider .slider-end-labels{font-size:14px}.nav-buttons{margin-bottom:20px}";

// https://stackoverflow.com/a/21626701
function makeBackgroundString(svg_string) {
	return "url('data:image/svg+xml;base64," + window.btoa(svg_string) + "')";
}

var chevron_body = '<svg width="100%" height="100%" viewBox="0 0 50 50" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:1.41421;"><path d="M43.33,22.133l-17.362,17.339c-0.297,0.296 -0.648,0.445 -1.053,0.445c-0.406,0 -0.757,-0.149 -1.053,-0.445l-17.362,-17.339c-0.297,-0.296 -0.445,-0.651 -0.445,-1.064c0,-0.414 0.148,-0.769 0.445,-1.065l3.884,-3.861c0.296,-0.296 0.647,-0.444 1.053,-0.444c0.406,0 0.757,0.148 1.053,0.444l12.425,12.425l12.425,-12.425c0.296,-0.296 0.647,-0.444 1.053,-0.444c0.405,0 0.756,0.148 1.053,0.444l3.884,3.861c0.296,0.296 0.444,0.651 0.444,1.065c0,0.413 -0.148,0.768 -0.444,1.064Z" style="fill:#fff;fill-rule:nonzero;"/></svg>';

var play_body = '<svg width="100%" height="100%" viewBox="0 0 50 50" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:1.41421;"><g transform="matrix(1,0,0,1,3.95878,18.1658)"><path d="M36.961,7.001L5.836,24.298C5.477,24.501 5.168,24.525 4.91,24.369C4.652,24.212 4.524,23.931 4.524,23.525L4.524,-10.975C4.524,-11.381 4.652,-11.663 4.91,-11.819C5.168,-11.975 5.477,-11.952 5.836,-11.749L36.961,5.548C37.32,5.751 37.5,5.994 37.5,6.275C37.5,6.556 37.32,6.798 36.961,7.001Z" style="fill:white;fill-rule:nonzero;"/></g></svg>';

var pause_body = '<svg width="100%" height="100%" viewBox="0 0 50 50" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve" style="fill-rule:evenodd;clip-rule:evenodd;stroke-linejoin:round;stroke-miterlimit:1.41421;"><path d="M40.867,7.941l0,33c0,0.406 -0.128,0.757 -0.386,1.054c-0.257,0.297 -0.562,0.446 -0.914,0.446l-10.401,0c-0.352,0 -0.657,-0.149 -0.914,-0.446c-0.258,-0.297 -0.386,-0.648 -0.386,-1.054l0,-33c0,-0.407 0.128,-0.758 0.386,-1.055c0.257,-0.297 0.562,-0.445 0.914,-0.445l10.401,0c0.352,0 0.657,0.148 0.914,0.445c0.258,0.297 0.386,0.648 0.386,1.055ZM22.665,7.941l0,33c0,0.406 -0.129,0.757 -0.386,1.054c-0.257,0.297 -0.562,0.446 -0.914,0.446l-10.402,0c-0.352,0 -0.657,-0.149 -0.914,-0.446c-0.257,-0.297 -0.386,-0.648 -0.386,-1.054l0,-33c0,-0.407 0.129,-0.758 0.386,-1.055c0.257,-0.297 0.562,-0.445 0.914,-0.445l10.402,0c0.352,0 0.657,0.148 0.914,0.445c0.257,0.297 0.386,0.648 0.386,1.055Z" style="fill:#fff;fill-rule:nonzero;"/></svg>';

var chevron_string = makeBackgroundString(chevron_body);
var play_string = makeBackgroundString(play_body);
var pause_string = makeBackgroundString(pause_body);

(function injectCSS(css) {
  if (typeof document === 'undefined') return;
  css = css;
  var head = document.head || document.getElementsByTagName('head')[0];
  var style$$1 = document.createElement('style');
  style$$1.type = 'text/css';
  head.appendChild(style$$1);
  
  if (style$$1.styleSheet){
    style$$1.styleSheet.cssText = css;
  } else {
    style$$1.appendChild(document.createTextNode(css));
  }
  return;
})(css_string);

var control_types = ["default", "buttons", "dropdown", "slider", "none"];


function createControlsGroup(container_selector) {
	var output_obj = {};
	var options, visible_control, current_index, current_value, width, is_animatable;
	
	var props = {
		"control_type": "default",
		width: 300,
		"step_time": 2,
		"loop_time": 1.5,
		"handle_colour": "#73bef7"
	};
	
	Object.keys(props).forEach(function(key) {
		// Convert from snake case properties to camel case methods
		var methodName = key.replace(/_\w/g, function(substr) { return substr.charAt(1).toUpperCase(); });
		output_obj[methodName] = function(val){
			if (val === undefined) return props[key];
			props[key] = val;
			return output_obj;
		};
	} );

	props.control_type = "default";

	output_obj.controlType = function(control_type) {
		if (control_type === undefined) return props.control_type;
		props.control_type = control_types.indexOf(control_type) !== -1 ? control_type : "default";
		return output_obj;
	};

	props.index = 0;

	output_obj.index = function(index) {
		if (index === undefined) return props.index;
		if (!Number.isFinite(index)) throw TypeError("index must be a number greater than or equal to 0.")
		if (index < 0) throw RangeError("index must be greater than or equal to 0.")
		props.index = Math.floor(index);
		return output_obj;
	};
	
	props.options = [];
	
	output_obj.options = function(opts) {
		if (opts === undefined) return props.options.slice();
		props.options = Object.freeze(opts.slice());
		return output_obj
	};

	Object.defineProperty(props, "value", {
  	get: function() { return props.options[props.index]; },
		set: function() { console.warn("Nothing changed: props.value is read only"); }
	} );

	output_obj.value = function(value){
		if (value === undefined) return props.value;
		var index = props.options.indexOf(value);
		if(index !== -1) props.index = index;
		else console.warn("Nothing changed: value not in options list");
		return output_obj;
	};

	props.changeHandlers = [];

	output_obj.on = function(event$$1, callback){
		if(event$$1 === "change") props.changeHandlers.push(callback.bind(output_obj));
		return this;
	};

	function onChangeCallbacks() {
		var value = props.value;
		var index = props.index;
		props.changeHandlers.forEach(function(func) {
			func(value, index);
		});
	}

	
	// Grab container
	var container = d3_select(container_selector).classed("controls-container", true);
	
	// Add top-level divs to DOM
	var heading = container.append("div").attr("class", "heading");
	var dropdown = container.append("div").attr("class", "dropdown");
	var slider_holder = container.append("div").attr("class", "slider-holder animatable");
	var button_nav = container.append("div").attr("class", "nav-buttons");
	
	// Add dropdown elements to DOM
	var dropdown_main = dropdown.append("div").attr("class", "main");
	var dropdown_current = dropdown_main.append("span").attr("class", "current");
	
	dropdown_main.append("span").attr("class", "symbol").style("background-image", chevron_string);
	var dropdown_list = dropdown.append("div").attr("class", "list");
	
	// Add slider elements to DOM
	var slider_play_button = slider_holder.append("div").attr("class", "slider-play").style("background-image", play_string);
	slider_holder.append("div").attr("class","slider");
	
	// Add button group to DOM
	var button_group = button_nav.append("div").attr("class", "btn-group");
	
	var showDropdownList = function(){
		dropdown.classed("open", true);
	};
	
	var hideDropdownList = function(){
		dropdown.classed("open", false);
	};
	
	var toggleDropdownList = function(){
		dropdown.classed("open", !dropdown.classed("open"));
	};
	
	var dropdown_node = dropdown.node(); 
	document.querySelector("body").addEventListener('click', function(event$$1) {
		if (!dropdown.classed("open")) return; // If already closed, nothing to close
		var el = event$$1.target;
		var parent = el.parentElement;
		while ( parent ) {
			if (el === dropdown_node) return; // We've clicked the dropdown, don't close it here
			el = parent;
			parent = el.parentElement;
		}
		hideDropdownList(); //Clicked somewhere else, hide the dropdown
	}, false);	
	
	dropdown_main.on("click", function() {
		toggleDropdownList();
	} );
	
	var updateDropdown = function() {
		dropdown_list.text("")
			.selectAll(".list-item")
			.data(options)
			.enter()
			.append("div")
			.attr("class", "list-item")
			.text(function(d) { return d; })
			.on("click", function(d, i) {
				hideDropdownList();
				if (d3_select(this).classed("selected")) return;
				props.index = i;
				updateCurrentValue();
				onChangeCallbacks();
			});
	};
	

	var slider = Flourish_slider(container_selector + " .slider-holder .slider")
			.handleRadius(12)
			.channelHeight(24)
			.snap(true)
			.margin({ left: 60, right: 60, top: 50 });
	
	var sliderplayer;

	var stopSliderPlayer = function() {
		if (!sliderplayer) return;
		clearInterval(sliderplayer);
		sliderplayer = undefined;
		slider_holder.classed("playing", false);
		slider_play_button.style("background-image", play_string);
	};

	var setSliderPlayerMove = function(next_index) {
		if (next_index === 0 && !props.loop_time) {
			stopSliderPlayer();
			return;
		}

		var next_time_step = 1000 * Math.abs(props.step_time) * (next_index ? 1 : props.loop_time);

		sliderplayer = setTimeout(function() {
			var index = props.step_time>0 ? next_index : options.length-(1+next_index);
			slider.value(index).update();
			props.index = index;
			onChangeCallbacks();
			var ni = (next_index+1)%options.length;
			setSliderPlayerMove(ni);
		}, next_time_step);
	};

	var startSliderPlayer = function() {
		if (!options || options.length < 2) return;
		var final_index = options.length - 1;
		var val = slider.value();
		var step_time = props.step_time;
		slider_holder.classed("playing", true);
		slider_play_button.style("background-image", pause_string);
		if (step_time > 0 && val === final_index) {
			val = 0;
			slider.value(val).update();
			props.index = val;
			onChangeCallbacks();
		}
		else if (step_time < 0 && val === 0) {
			val = final_index;
			slider.value(val).update();
			props.index = val;
			onChangeCallbacks();
		}
		var effective_index = step_time>0 ? val : options.length-(1+val);
		setSliderPlayerMove(effective_index + 1);
	};

	slider_play_button.on("click", function() {
		if (slider_holder.classed("playing")) stopSliderPlayer();
		else if (props.step_time) startSliderPlayer();
	});

	var updateSlider = function() {
		slider.domain([0, options.length - 1])
			.startLabel(options[0])
			.endLabel(options[options.length - 1])
			.label(props.value)
			.value(options.indexOf(props.value))
			.on("change", function(index) {
				if (index === props.index) return;
				props.index = index;
				updateCurrentValue();
				onChangeCallbacks();
			})
			.update();
	};


	var buttons;

	var updateButtons = function() {
			buttons = button_group.text("").selectAll(".btn")
				.data(options)
				.enter()
				.append("div")
				.attr("class", "btn")
				.classed("selected", function(d,i) { return i === current_index; } )
				.text(function(d) { return d; })
				.attr("title", function(d) { return d; })
				.on("click", function(d, i) {
					if (i === props.index) return;
					props.index = i;
					updateCurrentValue();
					onChangeCallbacks();
				});
	};


	var changeVisibleControl = function(control) {
		//if (control !== undefined && control === visible_control) return;
		visible_control = control;
		dropdown.style("display", visible_control==="dropdown" ? "inline-table" : "none");
		slider_holder.style("display", visible_control==="slider" ? "inline-block" : "none");
		button_nav.style("display", visible_control==="buttons" ? "inline-block" : "none");
		if (visible_control !== "dropdown") hideDropdownList();
		if (visible_control === "slider") {
			updateSlider(); //In case the width was changed while the slider was playing
		} else {
			stopSliderPlayer(); //In case the slider was playing when the visible control was changed
		}
	};

	var updateControlOptions = function() {
		var opts = props.options;
		var num_options = opts.length;
		if (num_options < 2) {
			//If here we have only 1 (or 0!??) option in the new options list 
			props.index = 0;
			changeVisibleControl("none");
			return false;
		}
		if (options && opts.length===options.length && opts.every(function(op, i) { return op===options[i]; })) {
			// If here we have multiple options that haven't changes since last update call.
			return true;
		}
		options = opts.slice();
		if (props.index > num_options - 1) props.index = num_options - 1;
		updateDropdown();
		updateSlider();
		updateButtons();
		return true;
	};

	var updateControlWidth = function() {
		if (width === props.width) return;
		width = props.width;
		var width_px = width + "px";
		dropdown.style("width", width_px);
		slider_holder.style("width", width_px);
		if (visible_control === "slider") slider.update(); //Doesn't update properly if slider is display: none
		button_nav.style("width", width_px);
	};

	var updateControlAnimation = function() {
		if (is_animatable === !!props.step_time) {
			if (is_animatable) slider_play_button.style("transform", props.step_time>0 ? null : "rotate(180deg)");
			return;
		}
		is_animatable = !is_animatable;
		if (!is_animatable) {
			stopSliderPlayer();
			slider_holder.classed("animatable", false);
			slider.update();
		} 
		else {
			slider_holder.classed("animatable", true);
			slider.update();
			slider_play_button.style("transform", props.step_time>0 ? null : "rotate(180deg)");
		}
	};

	var updateControlVisibility = function() {
		if (options.length < 2) {
			changeVisibleControl("none");
			return;
		}
		if (props.control_type !== "default") {
			changeVisibleControl(props.control_type);
		} 
		else { // When not in list we try and fit buttons then fallback to dropdown
			changeVisibleControl("buttons"); // Must make visible or buttons_fit always true!
			var buttons_fit = buttons.nodes().every(function(el) {
				return el.offsetWidth >= el.scrollWidth; // https://stackoverflow.com/a/36723850
			});
			if (!buttons_fit) changeVisibleControl("dropdown");
		}
	};

	var updateCurrentValue = function() {
		if (current_index === props.index && current_value === props.value) return;
		current_index = props.index;
		current_value = props.value;
		dropdown_current.text(current_value).attr("title", current_value);
		updateSlider();
		buttons.each(function(d,i) { d3_select(this).classed("selected", i===current_index); });
	};

	var updateSliderHandleColour = function() {
		slider_holder.select("circle").style("fill", props.handle_colour);
	};
	
	var updateControls = function() {
		output_obj;
		var multiple_options = updateControlOptions();
		if (!multiple_options) return;
		updateControlWidth();
		updateControlAnimation();
		updateControlVisibility();
		updateCurrentValue();
		updateSliderHandleColour();
	};

	output_obj.showDropdownList = function() { showDropdownList(); return this; };
	output_obj.hideDropdownList = function() { hideDropdownList(); return this; };
	output_obj.toggleDropdownList = function() { toggleDropdownList(); return this; };
	output_obj.update = function() { updateControls(); return this; };

	return output_obj;

}

exports.createControlsGroup = createControlsGroup;

Object.defineProperty(exports, '__esModule', { value: true });

})));