as绘制渐变颜色皮肤

这段代码画了一个球型
var myMatrix:Matrix = new Matrix();
//             trace(myMatrix.toString());          // (a=1, b=0, c=0, d=1, tx=0, ty=0)
//             
//             myMatrix.createGradientBox(200, 200, 0, 50, 50);
//             trace(myMatrix.toString());          // (a=0.1220703125, b=0, c=0, d=0.1220703125, tx=150, ty=150)
//             
//             var colors:Array = [0xFF0000, 0x0000FF];
//             var alphas:Array = [100, 100];
//             var ratios:Array = [0, 0xFF];
//             
//             this.graphics.beginGradientFill(GradientType.RADIAL, colors, alphas, ratios, myMatrix);
//             
//             this.graphics.drawRect(0, 0, 300, 300);
//             this.graphics.endFill();

 

 var myMatrix:Matrix = new Matrix();
             trace(myMatrix.toString());          // (a=1, b=0, c=0, d=1, tx=0, ty=0)
             var rad:Number = 90 * Math.PI/180;

             myMatrix.createGradientBox(200, 200, rad, 50, 50);
             trace(myMatrix.toString());          // (a=0.1220703125, b=0, c=0, d=0.1220703125, tx=150, ty=150)
             
             //var colors:Array = [0xFF0000, 0x0000FF];
             var colors:Array = [0x444444, 0xFFFFFF];
             var alphas:Array = [100, 100];
             var ratios:Array = [0, 0xFF];
             
             this.graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, myMatrix);
             this.graphics.drawRect(0, 0, 300, 100);