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heatmap-googlemaps.js
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heatmap-googlemaps.js
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function HeatMapOverlayView(map, options){
options = options || {};
this.setMap(map);
this.heatmap = null;
this.step = options.step || 1;
this.degree = options.degree || HeatMap.LINEAR;
this.opacity = options.opacity || 0.6;
this.colorscheme = options.colorscheme || null;
this.data = [];
}
HeatMapOverlayView.prototype = new google.maps.OverlayView();
HeatMapOverlayView.prototype.onAdd = function(){
var container = document.createElement("div");
container.style.cssText = "position:absolute;top:0;left:0;border:0";
container.style.width = "100%";
container.style.height = "100%";
var canvas = document.createElement("canvas");
canvas.style.width = this.map.getDiv().style.width;
canvas.style.height = this.map.getDiv().style.height;
canvas.width = parseInt(canvas.style.width);
canvas.height = parseInt(canvas.style.height);
canvas.style.opacity = this.opacity;
container.appendChild(canvas);
this.heatmap = new HeatMap(canvas);
var panes = this.getPanes();
panes.overlayLayer.appendChild(container);
}
HeatMapOverlayView.prototype.pushData = function(lat, lon, value) {
this.data.push({"lon":lon, "lat":lat, "v":value});
}
HeatMapOverlayView.prototype.draw = function() {
this.heatmap.clear();
if (this.data.length > 0) {
var proj = this.getProjection();
for (var i=0, l=this.data.length; i<l; i++) {
latlon = new google.maps.LatLng(this.data[i].lat, this.data[i].lon);
localXY = proj.fromLatLngToDivPixel(latlon);
this.heatmap.push(
Math.floor(localXY.x),
Math.floor(localXY.y),
this.data[i].v);
}
this.heatmap.render(this.step, this.degree, this.colorscheme);
}
}