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/*
* L.Path is a base class for rendering vector paths on a map. It's inherited by Polyline, Circle, etc.
*/
L.Path = L.Class.extend({
includes: [L.Mixin.Events],
statics: (function() {
var svgns = 'http://www.w3.org/2000/svg',
ce = 'createElementNS';
return {
SVG_NS: svgns,
SVG: !!(document[ce] && document[ce](svgns, 'svg').createSVGRect),
// how much to extend the clip area around the map view
// (relative to its size, e.g. 0.5 is half the screen in each direction)
CLIP_PADDING: 0.5
};
})(),
options: {
stroke: true,
color: '#0033ff',
weight: 5,
opacity: 0.5,
fill: false,
fillColor: null, //same as color by default
fillOpacity: 0.2,
clickable: true,
updateOnMoveEnd: false
},
initialize: function(options) {
L.Util.setOptions(this, options);
},
onAdd: function(map) {
this._map = map;
this._initElements();
this._initEvents();
this.projectLatlngs();
this._updatePath();
map.on('viewreset', this.projectLatlngs, this);
this._updateTrigger = this.options.updateOnMoveEnd ? 'moveend' : 'viewreset';
map.on(this._updateTrigger, this._updatePath, this);
},
onRemove: function(map) {
map._pathRoot.removeChild(this._container);
map.off('viewreset', this._projectLatlngs, this);
map.off(this._updateTrigger, this._updatePath, this);
},
projectLatlngs: function() {
// do all projection stuff here
},
getPathString: function() {
// form path string here
},
setStyle: function(style) {
L.Util.setOptions(this, style);
if (this._path) {
this._updateStyle();
}
},
_initElements: function() {
this._initRoot();
this._initPath();
this._initStyle();
},
_initRoot: function() {
if (!this._map._pathRoot) {
this._map._pathRoot = this._createElement('svg');
this._map._panes.overlayPane.appendChild(this._map._pathRoot);
this._map.on('moveend', this._updateSvgViewport, this);
this._updateSvgViewport();
}
},
_updateSvgViewport: function() {
this._updateViewport();
var vp = this._map._pathViewport,
min = vp.min,
max = vp.max,
width = max.x - min.x,
height = max.y - min.y,
root = this._map._pathRoot,
pane = this._map._panes.overlayPane;
// Hack to make flicker on drag end on mobile webkit less irritating
// Unfortunately I haven't found a good workaround for this yet
if (L.Browser.mobileWebkit) { pane.removeChild(root); }
L.DomUtil.setPosition(root, min);
root.setAttribute('width', width);
root.setAttribute('height', height);
root.setAttribute('viewBox', [min.x, min.y, width, height].join(' '));
if (L.Browser.mobileWebkit) { pane.appendChild(root); }
},
_updateViewport: function() {
var p = L.Path.CLIP_PADDING,
size = this._map.getSize(),
//TODO this._map._getMapPanePos()
panePos = L.DomUtil.getPosition(this._map._mapPane),
min = panePos.multiplyBy(-1).subtract(size.multiplyBy(p)),
max = min.add(size.multiplyBy(1 + p * 2));
this._map._pathViewport = new L.Bounds(min, max);
},
_initPath: function() {
this._container = this._createElement('g');
this._path = this._createElement('path');
this._container.appendChild(this._path);
this._map._pathRoot.appendChild(this._container);
},
_initStyle: function() {
if (this.options.stroke) {
this._path.setAttribute('stroke-linejoin', 'round');
this._path.setAttribute('stroke-linecap', 'round');
}
if (this.options.fill) {
this._path.setAttribute('fill-rule', 'evenodd');
} else {
this._path.setAttribute('fill', 'none');
}
this._updateStyle();
},
_updateStyle: function() {
if (this.options.stroke) {
this._path.setAttribute('stroke', this.options.color);
this._path.setAttribute('stroke-opacity', this.options.opacity);
this._path.setAttribute('stroke-width', this.options.weight);
}
if (this.options.fill) {
this._path.setAttribute('fill', this.options.fillColor || this.options.color);
this._path.setAttribute('fill-opacity', this.options.fillOpacity);
}
},
_updatePath: function() {
var str = this.getPathString();
if (!str) {
// fix webkit empty string parsing bug
str = 'M0 0';
}
this._path.setAttribute('d', str);
},
_createElement: function(name) {
return document.createElementNS(L.Path.SVG_NS, name);
},
// TODO remove duplication with L.Map
_initEvents: function() {
if (this.options.clickable) {
if (!L.Path.VML) {
this._path.setAttribute('class', 'leaflet-clickable');
}
L.DomEvent.addListener(this._container, 'click', this._onMouseClick, this);
var events = ['dblclick', 'mousedown', 'mouseover', 'mouseout'];
for (var i = 0; i < events.length; i++) {
L.DomEvent.addListener(this._container, events[i], this._fireMouseEvent, this);
}
}
},
_onMouseClick: function(e) {
if (this._map.dragging && this._map.dragging.moved()) { return; }
this._fireMouseEvent(e);
},
_fireMouseEvent: function(e) {
if (!this.hasEventListeners(e.type)) { return; }
this.fire(e.type, {
latlng: this._map.mouseEventToLatLng(e),
layerPoint: this._map.mouseEventToLayerPoint(e)
});
L.DomEvent.stopPropagation(e);
},
_redraw: function() {
this.projectLatlngs();
this._updatePath();
}
});
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