颜色变换

var bmd: BitmapData = new BitmapData(80,
	30,
	false,
	0xFF0000);

var cTransform: ColorTransform = new ColorTransform();
cTransform.alphaMultiplier = 0.8; //设置透明度因子为0.8
var rect: Rectangle = new Rectangle(0,
	0,
	40,
	30); //定义左半边矩形区域
bmd.colorTransform(rect,
	cTransform); //对rect区域应用colorTransform

var bm: Bitmap = new Bitmap(bmd);
addChild(bm);

bm.x = stage.stageWidth / 2 -
	bm.width / 2;
bm.y = stage.stageHeight / 2 -
	bm.height / 2;