[ActionScript 3.0] 利用ColorTransform实现对象（图片）的曝光过渡效果

 1 package
 2 {
 3     import com.tweener.transitions.Tweener;
 4     import flash.display.Loader;
 5     import flash.display.SimpleButton;
 6     import flash.display.Sprite;
 7     import flash.events.Event;
 8     import flash.events.MouseEvent;
 9     import flash.geom.ColorTransform;
10     import flash.net.URLRequest;
11     /**
12      * ...
13      * @author FrostYen
14      */
15  
16     public class ColorTransformExample extends Sprite
17     {
18         private var ldr:Loader = new Loader();
19         private var sp:Sprite = new Sprite();
20         private var btn:Sprite = new Sprite();
21         private var colorTransform:ColorTransform = new ColorTransform(1, 1, 1, 1, 255, 255, 255, 0);
22         private var frame:int=15;//相当于影片剪辑动画的帧数
23         public function ColorTransformExample() {
24             ldr.load(new URLRequest("image/farewell-to-fall.jpg"));
25             sp.transform.colorTransform = colorTransform;
26             btn.graphics.beginFill(0x666666);
27             btn.graphics.drawRect(0, 0, 100, 50);
28             btn.graphics.endFill();
29             btn.buttonMode = true;
30             btn.x = 700;
31             btn.y = 100;
32             this.addChild(btn);
33             this.addChild(sp);
34             sp.addChild(ldr);
35             stage.frameRate = 36;//帧频
36    
37             ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onImageLoaded);
38             btn.addEventListener(MouseEvent.CLICK, onClick);
39         }
40   
41         private function onClick(e:MouseEvent):void
42         {
43             addEventListener(Event.ENTER_FRAME, onEnter);
44         }
45   
46         private function onEnter(e:Event):void
47         {
48             if (colorTransform.redOffset > 0) {
49                 colorTransform.redOffset -= 255/frame;
50                 colorTransform.greenOffset -= 255/frame;
51                 colorTransform.blueOffset -= 255/frame;
52                 sp.transform.colorTransform = colorTransform;
53             }else {
54                 colorTransform = new ColorTransform(1, 1, 1, 1, 255, 255, 255, 0);
55                 removeEventListener(Event.ENTER_FRAME, onEnter);
56             }
57         }
58   
59         private function onImageLoaded(e:Event):void
60         {
61    
62         }
63     }
64 }