Radial gradient fill example

/**
 * Copyright John_Blackburne ( http://wonderfl.net/user/John_Blackburne )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/guKK
 */

package {
    import flash.display.GradientType;
    import flash.display.Sprite;
    import flash.display.Graphics;
    import flash.display.SpreadMethod;
    import flash.geom.Matrix;
    public class FlashTest extends Sprite {
        
        public function FlashTest() {
            // write as3 code here..
            var fX:Number, fY:Number, fR:Number, iRing:int, fSize:Number;
            var mat:Matrix;
            var g:Graphics = graphics;
            
            fSize = 60;
            
            mat = new Matrix();
            
            for (iRing = 0; iRing < 20; iRing++) {
                fX = fSize + Math.random() * (stage.stageWidth - 2 * fSize);
                fY = fSize + Math.random() * (stage.stageHeight - 2 * fSize);
                fR = 0.5 * fSize * (1 + Math.random());
        	mat.createGradientBox(2 * fR, 2 * fR, 0, fX - fR, fY - fR);
        	g.beginGradientFill(GradientType.RADIAL,
		    [0xd0d000, 0x6060ff], [1, 1], [0x20, 0xff],
         	    mat, SpreadMethod.PAD);

                g.drawCircle(fX, fY, fR);
            }
        }
    }
}