如何实现拖动图形时实现旋转功能

我想做一个七巧板拼图的课件，拖拽部分会做，不会让拖拽的图形旋转，想请教高手指点迷津！

附群中朋友提供的解决方法：
移动旋转.rar (5.9 KB, 下载次数: 85)

2012-4-22 10:44 上传

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1. var p:Number = Math.PI / 180;
   
2. var dx:Number;
   
3. var dy:Number;
   
4. var angle:Number;
   
5. 
   
6. var spr:Sprite=addChild(new Sprite())as Sprite;
   
7. spr.x = 275;
   
8. spr.y = 200;
   
9. var rect_mc:MovieClip=spr.addChild(new MovieClip())as MovieClip;
   
10. var circle_mc:MovieClip=spr.addChild(new MovieClip())as MovieClip;
    
11. rect_mc.graphics.beginFill (0xff00ff,1);
    
12. rect_mc.graphics.drawRect (-100,-50,200,100);
    
13. rect_mc.graphics.endFill ();
    
14. circle_mc.graphics.beginFill (0x000000,1);
    
15. circle_mc.graphics.drawCircle (0,0,6);
    
16. circle_mc.graphics.endFill ();
    
17. circle_mc.alpha = 0;
    
18. 
    
19. rect_mc.addEventListener (MouseEvent.MOUSE_OVER,overHandler);
    
20. rect_mc.addEventListener (MouseEvent.MOUSE_OUT,outHandler);
    
21. rect_mc.addEventListener (MouseEvent.MOUSE_DOWN,downHandler);
    
22. 
    
23. 
    
24. function overHandler (e)
    
25. {
    
26. circle_mc.alpha = 1;
    
27. 
    
28. }
    
29. function outHandler (e)
    
30. {
    
31. circle_mc.alpha = 0;
    
32. }
    
33. function downHandler (e)
    
34. {
    
35. spr.startDrag ();
    
36. stage.addEventListener (MouseEvent.MOUSE_UP,upHandler);
    
37. 
    
38. }
    
39. function upHandler (e)
    
40. {
    
41. spr.stopDrag ();
    
42. spr.removeEventListener (MouseEvent.MOUSE_MOVE,sprMove);
    
43. }
    
44. 
    
45. circle_mc.addEventListener (MouseEvent.MOUSE_OVER,circleOver);
    
46. function circleOver (e)
    
47. {
    
48. circle_mc.alpha = 1;
    
49. circle_mc.addEventListener (MouseEvent.MOUSE_DOWN,sprDown);
    
50. }
    
51. function sprDown (e)
    
52. {
    
53. spr.addEventListener (MouseEvent.MOUSE_MOVE,sprMove);
    
54. stage.addEventListener (MouseEvent.MOUSE_UP,upHandler);
    
55. }
    
56. function sprMove (e)
    
57. {
    
58. dx = mouseX - spr.x;
    
59. dy = mouseY - spr.y;
    
60. angle = Math.atan2(dy,dx) / p;
    
61. spr.rotation = angle;
    
62. }

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