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Only draw if read #18

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Only draw if read #18

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48d5cef
Only draw if ready
jonl-percsolutions-com Jun 7, 2016
4816511
convert return to early, add comments
jonl-percsolutions-com Jun 7, 2016
886ab00
coding style changes.
jonl-percsolutions-com Jun 8, 2016
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8 changes: 6 additions & 2 deletions simpleheat.js
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Original file line number Diff line number Diff line change
Expand Up @@ -96,6 +96,10 @@ simpleheat.prototype = {
},

draw: function (minOpacity) {
//return if width or height invalid
if (!this._width || !this._height) return this;

// colorize the heatmap, using opacity value of each pixel to get the right color from our gradient
if (!this._circle) this.radius(this.defaultRadius);
if (!this._grad) this.gradient(this.defaultGradient);

Expand All @@ -110,10 +114,9 @@ simpleheat.prototype = {
ctx.drawImage(this._circle, p[0] - this._r, p[1] - this._r);
}

// colorize the heatmap, using opacity value of each pixel to get the right color from our gradient
var colored = ctx.getImageData(0, 0, this._width, this._height);
this._colorize(colored.data, this._grad);
ctx.putImageData(colored, 0, 0);
ctx.putImageData(colored, 0, 0);

return this;
},
Expand All @@ -139,4 +142,5 @@ simpleheat.prototype = {
return new this._canvas.constructor();
}
}

};