[ActionScript 3.0] 创建倒影

 1 package 

 2 {

 3     import flash.display.Bitmap;

 4     import flash.display.BitmapData;

 5     import flash.display.DisplayObject;

 6     import flash.display.GradientType;

 7     import flash.display.Loader;

 8     import flash.display.Shape;

 9     import flash.display.Sprite;

10     import flash.events.Event;

11     import flash.geom.Matrix;

12     import flash.geom.Point;

13     import flash.net.URLRequest;

14 

15     /**

16       * ...

17       * @author Frost.Yen

18       */

19     [SWF(width=800, height=1000, backgroundColor=0x000000, frameRate=30)]

20     public class Reflection extends Sprite

21     {

22         private var ldr:Loader=new Loader();

23         private var pic:Sprite=new Sprite();

24         public function Reflection()

25         {

26             ldr.load(new URLRequest("http://hiphotos.baidu.com/frostyen/pic/item/7e49d8b53f6b48ffd9335aa2.jpg"));

27             ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onImageLoaded);

28         }

29 

30         private function onImageLoaded(e:Event):void

31         {

32             this.addChild(pic);

33             pic.addChild(ldr);

34             pic.x = 200;

35             pic.y = 10;

36             ldr.scaleX = ldr.scaleY = .5;

37             createRef(pic,5,0);

38         }

39         /**

40            *

41            * @param obj  需创建倒影的对象

42            * @param distance  对象与倒影的距离

43            * @param offset  倒影的偏移量

44            */

45         private function createRef(obj:DisplayObject,distance:Number=5,offset:Number=0):void

46         {

47             // 倒置

48             var bd:BitmapData = new BitmapData(obj.width,obj.height,true);

49             var mtx:Matrix = new Matrix();

50             mtx.d = -1;

51             mtx.ty = bd.height;

52             bd.draw(obj, mtx);

53 

54             // 添加倒影渐变

55             var _width:int = bd.width;

56             var _height:int = bd.height;

57 

58             mtx.createGradientBox(_width, _height, 0.5 * Math.PI,0,offset );

59             var shape:Shape = new Shape();

60             shape.graphics.beginGradientFill(GradientType.LINEAR, [0,0,0], [0.6,0.1, 0], [0,200, 255], mtx);

61             shape.graphics.drawRect(0, 0, _width, _height);

62             shape.graphics.endFill();

63             var mask_bd:BitmapData = new BitmapData(_width,_height,true,0);

64             mask_bd.draw(shape);

65             // 生成最终效果

66             bd.copyPixels(bd, bd.rect, new Point(0, 0), mask_bd, new Point(0, 0), false);

67             // 将倒影放置于对象下方

68             var ref:Bitmap = new Bitmap(bd);

69             ref.y = obj.height + obj.y + distance;

70             ref.x = obj.x;

71             obj.parent.addChild(ref);

72         }

73     }

74 

75 }