Flex4中垂直渐变填充矩形

var g:Graphics = this.graphics;g.clear();g.lineStyle(1, 0x000000);g.drawRect( 0, 0, unscaledWidth-1, unscaledHeight-1 );var fillType:String = GradientType.LINEAR;var colors:Array = [0x717171, 0xC0C0C0,0x717171];var alphas:Array = [1, 1,1];var ratios:Array = [0x32, 0x89, 0xFF];var matr:Matrix = new Matrix();matr.createGradientBox(unscaledWidth-3, unscaledHeight-3, Math.PI / 2, 0, 0);var spreadMethod:String = SpreadMethod.PAD;this.graphics.beginGradientFill(fillType, colors, alphas, ratios, matr, spreadMethod);  g.drawRect( 1, 1, unscaledWidth-3, unscaledHeight-3 );g.endFill();

渐变效果: