6 lines
2.2 KiB
JavaScript
6 lines
2.2 KiB
JavaScript
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/*
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* MIT Copyright 2016 Ursudio <info@ursudio.com>
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* http://www.ursudio.com/
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* Please attribute Ursudio in any production associated with this JavaScript plugin.
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*/
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L.WebGLHeatMap=L.Renderer.extend({version:"0.2.2",options:{size:3e4,units:"m",opacity:1,gradientTexture:!1,alphaRange:1,padding:0},_initContainer:function(){var t=this._container=L.DomUtil.create("canvas","leaflet-zoom-animated"),i=this.options;t.id="webgl-leaflet-"+L.Util.stamp(this),t.style.opacity=i.opacity,t.style.position="absolute";try{this.gl=window.createWebGLHeatmap({canvas:t,gradientTexture:i.gradientTexture,alphaRange:[0,i.alphaRange]})}catch(t){console.error(t),this.gl={clear:function(){},update:function(){},multiply:function(){},addPoint:function(){},display:function(){},adjustSize:function(){}}}this._container=t},onAdd:function(){this.size=this.options.size,L.Renderer.prototype.onAdd.call(this),this.resize()},getEvents:function(){var t=L.Renderer.prototype.getEvents.call(this);return L.Util.extend(t,{resize:this.resize,move:L.Util.throttle(this._update,49,this)}),t},resize:function(){var t=this._container,i=this._map.getSize();t.width=i.x,t.height=i.y,this.gl.adjustSize(),this.draw()},reposition:function(){var t=this._map._getMapPanePos().multiplyBy(-1);L.DomUtil.setPosition(this._container,t)},_update:function(){L.Renderer.prototype._update.call(this),this.draw()},draw:function(){var t=this._map,i=this.gl,e=this.data,a=e.length,n=Math.floor,s=this["_scale"+this.options.units].bind(this),o=this._multiply;if(t){if(i.clear(),this.reposition(),a){for(var r=0;r<a;r++){var l=e[r],h=L.latLng(l),u=t.latLngToContainerPoint(h);i.addPoint(n(u.x),n(u.y),s(h),l[2])}i.update(),o&&(i.multiply(o),i.update())}i.display()}},_scalem:function(t){var i=this._map,e=this.size/40075017*360/Math.cos(Math.PI/180*t.lat),a=new L.LatLng(t.lat,t.lng-e),n=i.latLngToLayerPoint(t),s=i.latLngToLayerPoint(a);return Math.max(Math.round(n.x-s.x),1)},_scalepx:function(){return this.size},data:[],addDataPoint:function(t,i,e){this.data.push([t,i,e/100])},setData:function(t){this.data=t,this._multiply=null,this.draw()},clear:function(){this.setData([])},multiply:function(t){this._multiply=t,this.draw()}}),L.webGLHeatmap=function(t){return new L.WebGLHeatMap(t)};
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