AS3复制图形镜像

在做开发的时候遇到了图形镜像的问题，感觉这个不难但是写起来应该是挺麻烦的。不过看了网上的一篇文章以后发现其实解决的方法是很多的。

 1 var container:Sprite = new Sprite();
 2 var brush:Sprite = new Sprite();
 3 //设置镜像中心点的位置set mirror center
 4 brush.x = 600/2;
 5 brush.y = 400/2;
 6 container.addChild ( brush );
 7 addChild ( container );
 8 
 9 var canDraw:Boolean = false;
10 var pen:Graphics = brush.graphics;
11 
12 //复制镜像部分 copy mirror
13 var mirrorBmd:BitmapData = new BitmapData(600,400,true,0x00ffffff );
14 var mirrorImage:Bitmap = new Bitmap( mirrorBmd );
15 addChild ( mirrorImage );
16 //镜像的数量
17 var mirrorNum = 8;
18 //镜像生成函数
19 function showMirrorImage () {
20     var angle = 360 / mirrorNum;
21     mirrorBmd.draw ( container );
22     for (var i:int = 1; i < mirrorNum; i++) {
23         brush.rotation = angle * i;
24         mirrorBmd.draw ( container );
25     }
26     brush.rotation = 0;
27 }
28 
29 stage.addEventListener ( MouseEvent.MOUSE_DOWN, beginPaint );
30 stage.addEventListener ( MouseEvent.MOUSE_MOVE, onPaint );
31 stage.addEventListener ( MouseEvent.MOUSE_UP, endPaint );
32 function beginPaint (_evt:MouseEvent ) {
33     canDraw = true;
34     pen.lineStyle (1, 0x006699, 0.75, true, "normal", CapsStyle.ROUND, JointStyle.ROUND, 0.5);
35     pen.moveTo (brush.mouseX, brush.mouseY);
36 }
37 function onPaint ( evt:MouseEvent ) {
38     if ( canDraw ) {
39         pen.lineTo ( brush.mouseX, brush.mouseY );
40         showMirrorImage ();
41     }
42 }
43 function endPaint ( evt:MouseEvent ) {
44     if ( canDraw ) {
45         pen.lineTo ( brush.mouseX, brush.mouseY );
46         pen.clear ();
47         canDraw = false;
48     }
49 }