as3翻牌动画
----------------------------------------------------
主要利用了rotationY属性来进行处理，Pseudocode：
1: import com.greensock.*;
2: import com.greensock.easing.*;
3:
4: //startValues for the card back
5: flipper.back.rotationY = -90;
6: flipper.back.alpha=0;
7:
8: //speed of 90 degrees of flip
9: var flipSpeed:Number = .5;
10:
11: //create TimelineMax instance
12: var tl:TimelineMax = new TimelineMax({paused:true});
13:
14: //flip the front 90 degrees
15: tl.append(TweenMax.to(flipper.front, flipSpeed, {rotationY:90, visible:false, ease:Linear.easeNone}))
16:
17: //set the back to alpha of 0 as soon as front finishes
18: tl.append(TweenMax.to(flipper.back, 0, {alpha:1, immediateRender:false}))
19:
20: //flip the back 90 degrees
21: tl.append(TweenMax.to(flipper.back, flipSpeed, {rotationY:0, ease:Linear.easeNone}))
22:
23: //basic button code
24: flip1_mc.addEventListener(MouseEvent.CLICK, flip1);
25:
26: function flip1(e:MouseEvent){
27: // play to the beginning of the timeline
28: tl.tweenTo(0);
29: }
30:
31: flip2_mc.addEventListener(MouseEvent.CLICK, flip2);
32: function flip2(e:MouseEvent){
33: // play to the end of the timeline
34: tl.tweenTo(tl.duration);
35: }
参考链接：Easy Breezy 3D Card Flip Effect with Flash, AS3 and Our Good Buddy TimelineMax
本示例下载链接：flipper_new_cs4.zip (需flash cs4+ 才能打开)
