14 lines
5.2 KiB
JavaScript
14 lines
5.2 KiB
JavaScript
/*
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Retrieved from https://leaflet.github.io/Leaflet.heat/dist/leaflet-heat.js
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Includes patch to fix weights issue (https://github.com/Leaflet/Leaflet.heat/pull/78)
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*/
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/*
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(c) 2014, Vladimir Agafonkin
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simpleheat, a tiny JavaScript library for drawing heatmaps with Canvas
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https://github.com/mourner/simpleheat
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*/!function(){"use strict";function i(t){return this instanceof i?(this._canvas=t="string"==typeof t?document.getElementById(t):t,this._ctx=t.getContext("2d"),this._width=t.width,this._height=t.height,this._max=1,void this.clear()):new i(t)}i.prototype={defaultRadius:25,defaultGradient:{.4:"blue",.6:"cyan",.7:"lime",.8:"yellow",1:"red"},data:function(t,i){return this._data=t,this},max:function(t){return this._max=t,this},add:function(t){return this._data.push(t),this},clear:function(){return this._data=[],this},radius:function(t,i){i=i||15;var a=this._circle=document.createElement("canvas"),s=a.getContext("2d"),e=this._r=t+i;return a.width=a.height=2*e,s.shadowOffsetX=s.shadowOffsetY=200,s.shadowBlur=i,s.shadowColor="black",s.beginPath(),s.arc(e-200,e-200,t,0,2*Math.PI,!0),s.closePath(),s.fill(),this},gradient:function(t){var i=document.createElement("canvas"),a=i.getContext("2d"),s=a.createLinearGradient(0,0,0,256);for(var e in i.width=1,i.height=256,t)s.addColorStop(e,t[e]);return a.fillStyle=s,a.fillRect(0,0,1,256),this._grad=a.getImageData(0,0,1,256).data,this},draw:function(t){this._circle||this.radius(this.defaultRadius),this._grad||this.gradient(this.defaultGradient);var i=this._ctx;i.clearRect(0,0,this._width,this._height);for(var a,s=0,e=this._data.length;s<e;s++)a=this._data[s],i.globalAlpha=Math.max(a[2]/this._max,t||.05),i.drawImage(this._circle,a[0]-this._r,a[1]-this._r);var n=i.getImageData(0,0,this._width,this._height);return this._colorize(n.data,this._grad),i.putImageData(n,0,0),this},_colorize:function(t,i){for(var a,s=3,e=t.length;s<e;s+=4)(a=4*t[s])&&(t[s-3]=i[a],t[s-2]=i[1+a],t[s-1]=i[2+a])}},window.simpleheat=i}(),/*
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(c) 2014, Vladimir Agafonkin
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Leaflet.heat, a tiny and fast heatmap plugin for Leaflet.
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https://github.com/Leaflet/Leaflet.heat
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*/L.HeatLayer=(L.Layer?L.Layer:L.Class).extend({initialize:function(t,i){this._latlngs=t,L.setOptions(this,i)},setLatLngs:function(t){return this._latlngs=t,this.redraw()},addLatLng:function(t){return this._latlngs.push(t),this.redraw()},setOptions:function(t){return L.setOptions(this,t),this._heat&&this._updateOptions(),this.redraw()},redraw:function(){return this._heat&&!this._frame&&this._map&&!this._map._animating&&(this._frame=L.Util.requestAnimFrame(this._redraw,this)),this},onAdd:function(t){this._map=t,this._canvas||this._initCanvas(),this.options.pane?this.getPane().appendChild(this._canvas):t._panes.overlayPane.appendChild(this._canvas),t.on("moveend",this._reset,this),t.options.zoomAnimation&&L.Browser.any3d&&t.on("zoomanim",this._animateZoom,this),this._reset()},onRemove:function(t){this.options.pane?this.getPane().removeChild(this._canvas):t.getPanes().overlayPane.removeChild(this._canvas),t.off("moveend",this._reset,this),t.options.zoomAnimation&&t.off("zoomanim",this._animateZoom,this)},addTo:function(t){return t.addLayer(this),this},_initCanvas:function(){var t=this._canvas=L.DomUtil.create("canvas","leaflet-heatmap-layer leaflet-layer"),i=L.DomUtil.testProp(["transformOrigin","WebkitTransformOrigin","msTransformOrigin"]);t.style[i]="50% 50%";var a=this._map.getSize();t.width=a.x,t.height=a.y;var s=this._map.options.zoomAnimation&&L.Browser.any3d;L.DomUtil.addClass(t,"leaflet-zoom-"+(s?"animated":"hide")),this._heat=simpleheat(t),this._updateOptions()},_updateOptions:function(){this._heat.radius(this.options.radius||this._heat.defaultRadius,this.options.blur),this.options.gradient&&this._heat.gradient(this.options.gradient)},_reset:function(){var t=this._map.containerPointToLayerPoint([0,0]);L.DomUtil.setPosition(this._canvas,t);var i=this._map.getSize();this._heat._width!==i.x&&(this._canvas.width=this._heat._width=i.x),this._heat._height!==i.y&&(this._canvas.height=this._heat._height=i.y),this._redraw()},_redraw:function(){if(this._map){var t,i,a,s,e,n,h,o,r=[],_=this._heat._r,d=this._map.getSize(),l=new L.Bounds(L.point([-_,-_]),d.add([_,_])),m=_/2,c=[],u=this._map._getMapPanePos(),f=u.x%m,g=u.y%m;for(this._max=1,t=0,i=this._latlngs.length;t<i;t++){a=this._map.latLngToContainerPoint(this._latlngs[t]),e=Math.floor((a.x-f)/m)+2,n=Math.floor((a.y-g)/m)+2;var p=void 0!==this._latlngs[t].alt?this._latlngs[t].alt:void 0!==this._latlngs[t][2]?+this._latlngs[t][2]:1;c[n]=c[n]||[],(s=c[n][e])?(s[0]=(s[0]*s[2]+a.x*p)/(s[2]+p),s[1]=(s[1]*s[2]+a.y*p)/(s[2]+p),s[2]+=p):(s=c[n][e]=[a.x,a.y,p]).p=a,s[2]>this._max&&(this._max=s[2])}for(this._heat.max(this._max),t=0,i=c.length;t<i;t++)if(c[t])for(h=0,o=c[t].length;h<o;h++)(s=c[t][h])&&l.contains(s.p)&&r.push([Math.round(s[0]),Math.round(s[1]),Math.min(s[2],this._max)]);this._heat.data(r).draw(this.options.minOpacity),this._frame=null}},_animateZoom:function(t){var i=this._map.getZoomScale(t.zoom),a=this._map._getCenterOffset(t.center)._multiplyBy(-i).subtract(this._map._getMapPanePos());L.DomUtil.setTransform?L.DomUtil.setTransform(this._canvas,a,i):this._canvas.style[L.DomUtil.TRANSFORM]=L.DomUtil.getTranslateString(a)+" scale("+i+")"}}),L.heatLayer=function(t,i){return new L.HeatLayer(t,i)};
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