有点空，写下效果练习下。 效果截图： 
[codesyntax lang=”actionscript3”]
package com.shadow
{
import flash.display.Bitmap;
import flash.display.BitmapData;
import flash.display.Sprite;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
import flash.events.Event;
import flash.geom.ColorTransform;
import flash.geom.Matrix;
import flash.geom.Rectangle;
[SWF(width=”800”,height=”600”)]
public class Shadow extends Sprite
{
[Embed(source=”../../../assets/phone.png”)]
private var Phone:Class;
private var bgbmd:BitmapData;
private var phone:Bitmap;
private const WIDTH:int = 800;
private const HEIGHT:int = 600;
private var speedX:int;
private var speedY:int;
public function Shadow()
{
super();
this.addEventListener(Event.ADDED_TO_STAGE,addToStage);
}
protected function addToStage(event:Event):void
{
stage.align = StageAlign.TOP_LEFT;
stage.scaleMode = StageScaleMode.NO_SCALE;
phone = new Phone() as Bitmap;
bgbmd = new BitmapData(WIDTH,HEIGHT);
var bg:Bitmap = new Bitmap(bgbmd);
addChild(bg);
this.speedX = 20;
this.speedY = 10;
this.addEventListener(Event.ENTER_FRAME,loop);
}
protected function loop(event:Event):void
{
phone.x += speedX;
phone.y += speedY;
if(phone.x > WIDTH phone.x < 0) speedX*=-1;
if(phone.y > HEIGHT phone.y < 0) speedY*=-1;
bgbmd.draw(phone,new Matrix(1,0,0,1,phone.x,phone.y));
bgbmd.colorTransform(new Rectangle(0,0,WIDTH,HEIGHT),new ColorTransform(1,1,1,0.8));
}
}
}
[/codesyntax]