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Improve commens and get rid of for loop to in nameToRGBColor().

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This commit is contained in:
Jürg Lehni 2011-03-13 23:00:01 +01:00
parent 1c8c64c473
commit bfd43b27fa
1 changed files with 6 additions and 10 deletions
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16
src/color/Color.js
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@ -23,27 +23,23 @@ var Color = this.Color = Base.extend(new function() {
var color = colorCache[name];
if (color)
return color;
// Use a 1x1 Canvas to draw to with the given name and then
// retrieve the rgb values from. Build a cache for all these
// colors on a per use basis.
// Use a canvas to draw to with the given name and then retrieve the rgb
// values from. Build a cache for all these colors on a per use basis.
if (!colorContext) {
var canvas = CanvasProvider.getCanvas(Size.create(1, 1));
colorContext = canvas.getContext('2d');
colorContext.globalCompositeOperation = 'copy';
}
// Set the fillStyle of the context to the passed name
// and fill the canvas with it. Then retrieve the first pixel:
// Set the fillStyle of the context to the passed name and fill the
// canvas with it, then retrieve the data for the drawn pixel:
colorContext.fillStyle = name;
colorContext.fillRect(0, 0, 1, 1);
var data = colorContext.getImageData(0, 0, 1, 1).data,
rgb = [];
for (var i = 0; i < 3; i++)
rgb[i] = data[i] / 255;
rgb = [data[0] / 255, data[1] / 255, data[2] / 255];
// If the name wasn't found, rgb is [0, 0, 0]
if (rgb.join('') == '000' && name != 'black') {
if (rgb.join('') == '000' && name != 'black')
throw new Error('The named color "' + name
+ '" does not exist.');
}
return (colorCache[name] = RGBColor.read(rgb));
}