[转]Reflection倒影应用一例

最近在做3DWall,需要倒影的效果..以前是用Mask来做的..效果很低..
网上参考了一下别人的代码..整理了成一个函数..
调用的时候直接使用getReflection(target)返回一个bitmapData对象
也可以使用getReflection(target,100)来指定倒影高度...

private function getReflection(target:DisplayObject,height:Number = -1):BitmapData
{ 
	if(height<0)height = target.height
	var bit:BitmapData = new BitmapData(target.width,height,true,0); 
	bit.draw(target,new Matrix(1,0,0,-1,0,target.height)); 
	
	
        //渐变拷贝
	var mtx:Matrix = new Matrix(); 
	mtx.createGradientBox(target.width,height,0.5 * Math.PI); 
	var shape:Shape = new Shape(); 
	shape.graphics.beginGradientFill(GradientType.LINEAR,[0,0],[0.5,0],[0,255],mtx) 
	shape.graphics.drawRect(0,0,target.width,height); 
	shape.graphics.endFill();
		
	var alpha:BitmapData = new BitmapData(target.width,height,true,0); 
	alpha.draw(shape); 
	bit.copyPixels(bit,bit.rect,new Point(0,0),alpha,new Point(0,0),false); 
	return bit.clone()
}

应用一例

var reflection:Bitmap = new Bitmap(getReflection(target,100)); 
reflection.x = target.x; 
reflection.y = target.y + target.height; 

addChild(reflection);