[ActionScript 3.0] 通过BitmapData将对象保存成jpg图片

此方法需要用到JPGEncoder.as和BitString.as这两个类，是将BitmapData对象转换成ByteArray，然后通过FileStream把此ByteArray写入到文件保存成jpg图片,因为用到File相关类，故需要用air播放器发布flash，在此提供两个下载JPGEncoder.as和BitString.as类的地址，

CSDN：http://download.csdn.net/source/3205224

Adobe官方的CoreLib下载: http://code.google.com/p/as3corelib/ 使用其中的:com.adobe.images.JPEGEncoder

以下是一个简单例子，SaveToJPEG .as 类 可直接作为文档类

 

 1 package 

 2 {

 3     import JPEGEncoder.JPGEncoder;

 4     import flash.display.Bitmap;

 5     import flash.display.BitmapData;

 6     import flash.display.Loader;

 7     import flash.display.MovieClip;

 8     import flash.display.Sprite;

 9     import flash.events.Event;

10     import flash.events.MouseEvent;

11     import flash.filesystem.File;

12     import flash.filesystem.FileMode;

13     import flash.filesystem.FileStream;

14     import flash.geom.Rectangle;

15     import flash.net.URLRequest;

16     import flash.text.TextField;

17     import flash.text.TextFieldAutoSize;

18     import flash.utils.ByteArray;

19 

20     /**

21       * ...

22       * @author Frost.Yen

23       */

24     public class SaveToJPEG extends Sprite

25     {

26         var ldr:Loader = new Loader();

27         var rect:Rectangle;

28         var bytearr:ByteArray;

29         public function SaveToJPEG():void

30         {

31             init();

32         }

33 

34         private function init():void

35         {

36             var btnMC:MovieClip = new MovieClip();

37             btnMC.graphics.beginFill(0xcccccc);

38             btnMC.graphics.drawRoundRect(0, 0, 100, 40, 10, 10);

39             btnMC.graphics.endFill();

40             btnMC.x = 630;

41             btnMC.y = 50;

42             btnMC.buttonMode = true;

43             btnMC.addEventListener(MouseEvent.CLICK, onClick);

44             this.addChild(btnMC);

45 

46             var txt:TextField = new TextField();

47             txt.autoSize = TextFieldAutoSize.LEFT;

48             txt.selectable = false;

49             txt.mouseEnabled = false;

50             txt.text = "点击保存此图片";

51             txt.x = (btnMC.width - txt.width) / 2;

52             txt.y = (btnMC.height - txt.height) / 2;

53             btnMC.addChild(txt);

54 

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

56             ldr.contentLoaderInfo.addEventListener(Event.COMPLETE, onComplete);

57         }

58 

59         private function onClick(e:MouseEvent):void

60         {

61             if (bytearr != null)

62             {

63                 var file:File = new File();

64                 file.browseForDirectory("保存");

65                 file.addEventListener(Event.SELECT, onSelectPath);

66             }

67         }

68 

69         private function onSelectPath(e:Event):void

70         {

71             var file:File = (e.target as File).resolvePath("松竹梅副本.jpg");

72             var filestream:FileStream = new FileStream();

73             filestream.open(file, FileMode.WRITE);

74             filestream.writeBytes(bytearr);

75         }

76 

77         private function onComplete(e:Event):void

78         {

79             this.addChild(ldr);

80             rect = ldr.getRect(ldr);

81 

82             var bmpd:BitmapData = new BitmapData(rect.width,rect.height);

83             bmpd.draw(ldr);

84             var jpg:JPGEncoder = new JPGEncoder();

85             bytearr = jpg.encode(bmpd) as ByteArray;

86         }

87     }

88 }