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some suggestions #30

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4 changes: 4 additions & 0 deletions simpleheat.js
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Expand Up @@ -111,6 +111,10 @@ simpleheat.prototype = {
}

// colorize the heatmap, using opacity value of each pixel to get the right color from our gradient
//some time,the canvas's width and height may be zero
if(this._width==0||this._height==0){
this.resize();
}
var colored = ctx.getImageData(0, 0, this._width, this._height);
this._colorize(colored.data, this._grad);
ctx.putImageData(colored, 0, 0);
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