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| /*
* L.Polyline is used to display polylines on a map.
*/
L.Polyline = L.Path.extend({
initialize: function (latlngs, options) {
L.Path.prototype.initialize.call(this, options);
this._latlngs = this._convertLatLngs(latlngs);
},
options: {
// how much to simplify the polyline on each zoom level
// more = better performance and smoother look, less = more accurate
smoothFactor: 1.0,
noClip: false
},
projectLatlngs: function () {
this._originalPoints = [];
for (var i = 0, len = this._latlngs.length; i < len; i++) {
this._originalPoints[i] = this._map.latLngToLayerPoint(this._latlngs[i]);
}
},
getPathString: function () {
for (var i = 0, len = this._parts.length, str = ''; i < len; i++) {
str += this._getPathPartStr(this._parts[i]);
}
return str;
},
getLatLngs: function () {
return this._latlngs;
},
setLatLngs: function (latlngs) {
this._latlngs = this._convertLatLngs(latlngs);
return this.redraw();
},
addLatLng: function (latlng) {
this._latlngs.push(L.latLng(latlng));
return this.redraw();
},
spliceLatLngs: function () { // (Number index, Number howMany)
var removed = [].splice.apply(this._latlngs, arguments);
this._convertLatLngs(this._latlngs, true);
this.redraw();
return removed;
},
closestLayerPoint: function (p) {
var minDistance = Infinity, parts = this._parts, p1, p2, minPoint = null;
for (var j = 0, jLen = parts.length; j < jLen; j++) {
var points = parts[j];
for (var i = 1, len = points.length; i < len; i++) {
p1 = points[i - 1];
p2 = points[i];
var sqDist = L.LineUtil._sqClosestPointOnSegment(p, p1, p2, true);
if (sqDist < minDistance) {
minDistance = sqDist;
minPoint = L.LineUtil._sqClosestPointOnSegment(p, p1, p2);
}
}
}
if (minPoint) {
minPoint.distance = Math.sqrt(minDistance);
}
return minPoint;
},
getBounds: function () {
var bounds = new L.LatLngBounds(),
latLngs = this.getLatLngs(),
i, len;
for (i = 0, len = latLngs.length; i < len; i++) {
bounds.extend(latLngs[i]);
}
return bounds;
},
_convertLatLngs: function (latlngs, overwrite) {
var i, len, target = overwrite ? latlngs : [];
for (i = 0, len = latlngs.length; i < len; i++) {
Iif (L.Util.isArray(latlngs[i]) && typeof latlngs[i][0] !== 'number') {
return;
}
target[i] = L.latLng(latlngs[i]);
}
return target;
},
_initEvents: function () {
L.Path.prototype._initEvents.call(this);
},
_getPathPartStr: function (points) {
var round = L.Path.VML;
for (var j = 0, len2 = points.length, str = '', p; j < len2; j++) {
p = points[j];
Iif (round) {
p._round();
}
str += (j ? 'L' : 'M') + p.x + ' ' + p.y;
}
return str;
},
_clipPoints: function () {
var points = this._originalPoints,
len = points.length,
i, k, segment;
Eif (this.options.noClip) {
this._parts = [points];
return;
}
this._parts = [];
var parts = this._parts,
vp = this._map._pathViewport,
lu = L.LineUtil;
for (i = 0, k = 0; i < len - 1; i++) {
segment = lu.clipSegment(points[i], points[i + 1], vp, i);
if (!segment) {
continue;
}
parts[k] = parts[k] || [];
parts[k].push(segment[0]);
// if segment goes out of screen, or it's the last one, it's the end of the line part
if ((segment[1] !== points[i + 1]) || (i === len - 2)) {
parts[k].push(segment[1]);
k++;
}
}
},
// simplify each clipped part of the polyline
_simplifyPoints: function () {
var parts = this._parts,
lu = L.LineUtil;
for (var i = 0, len = parts.length; i < len; i++) {
parts[i] = lu.simplify(parts[i], this.options.smoothFactor);
}
},
_updatePath: function () {
Iif (!this._map) { return; }
this._clipPoints();
this._simplifyPoints();
L.Path.prototype._updatePath.call(this);
}
});
L.polyline = function (latlngs, options) {
return new L.Polyline(latlngs, options);
};
|