Actionscript:
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// add a BitmapData object to the stage in one line:
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addChild(new Bitmap(new BitmapData(200,200,false,0x00000)));
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// draw a radial gradient
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for (var i:int = 0; i<200; i++) for (var j:int = 0; j<200; j++)
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Bitmap(getChildAt(0)).bitmapData.setPixel( i, j, 100 + 100 * Math.sin(Math.sqrt(Math.pow(i - 100, 2)+Math.pow(j - 100, 2)) * 40 * Math.PI/180) <<16 );
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/*
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WARNING: This code was written for fun. Use at your own risk.
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*/
Next I'll post a readable version, just wanted to see how compact I could get this...
This was inspired by all the pixel bender stuff that I've seen. I did the same thing with setVector() - will post about setVector() in the future.