as3实现翻牌效果

代码如下：
注意，元件Card10必须对称，且中心放置在注册点上(代码来源于flash游戏编程大学)：

/* This code is from "ActionScript 3.0 Game Programming University" by Gary Rosenzweig
Copyright 2007
http://flashgameu.com
See the book or site for more information */

package {
	import flash.display.*;
	import flash.events.*;
	
	public dynamic class Card10 extends MovieClip {
		private var flipStep:uint;
		private var isFlipping:Boolean = false;
		private var flipToFrame:uint;
		
		// begin the flip, remember which frame to jump to
		public function startFlip(flipToWhichFrame:uint) {
			isFlipping = true;
			flipStep = 10;
			flipToFrame = flipToWhichFrame;
			this.addEventListener(Event.ENTER_FRAME, flip);
		}
		
		// take 10 steps to flip
		public function flip(event:Event) {
			flipStep--; // next step
			
			if (flipStep > 5) { // first half of flip
				this.scaleX = .20*(flipStep-6);
			} else { // second half of flip
				this.scaleX = .20*(5-flipStep);
			}
			
			// when it is the middle of the flip, go to new frame
			if (flipStep == 5) {
				gotoAndStop(flipToFrame);
			}
			
			// at the end of the flip, stop the animation
			if (flipStep == 0) {
				this.removeEventListener(Event.ENTER_FRAME, flip);
			}
		}
	}
}