开发环境：flex3.2
如图:

1. <?xml version="1.0" encoding="utf-8"?>
2. <mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
3. <mx:Script>
4. <![CDATA[
5. import mx.controls.*;
6. import mx.core.*;
7. import mx.effects.*;
8. import mx.effects.Move;
9. private var sprite:Sprite=new Sprite();
10. private function onMouseMoveHandleByMyChartCanvas(e : MouseEvent) : void {
11. var cmouseX:Number=myChartCanvas.mouseX;
12. var cmouseY:Number=myChartCanvas.mouseY;
13. var lineWidth:uint=1;
14. var ccolor:uint=0xC0C0C0;
15. sprite.graphics.clear(); //清空绘制的所有线条
16. sprite.graphics.lineStyle(lineWidth,ccolor); //设置线条的宽度和颜色
17. //1.绘制左侧边缘到 鼠标当前点-2像素的线条
18. sprite.graphics.moveTo(cmouseX-2, cmouseY);
19. sprite.graphics.lineTo(0,cmouseY);
20. //2.绘制 鼠标当前点-2像素到顶端的线条
21. sprite.graphics.moveTo(cmouseX, cmouseY-2);
22. sprite.graphics.lineTo(cmouseX,0);
23. //3.绘制 鼠标当前点+2像素到右侧边缘的线条
24. sprite.graphics.moveTo(cmouseX+2, cmouseY);
25. sprite.graphics.lineTo(myChartCanvas.width,cmouseY);
26. //4.绘制 鼠标当前点+2像素到底端边缘的线条
27. sprite.graphics.moveTo(cmouseX, cmouseY+2);
28. sprite.graphics.lineTo(cmouseX,myChartCanvas.height);
29. var uic:UIComponent = new UIComponent();
30. uic.addChild(sprite);
31. myChartCanvas.addChild(uic);
32. }
33. ]]>
34. </mx:Script>
35. <mx:VBox width="100%" height="100%">
36. <mx:Canvas width="100%" height="315" id="myChartCanvas" mouseMove="onMouseMoveHandleByMyChartCanvas(event)" backgroundColor="#006699">
37. <mx:Button click="Alert.show('测试按钮事件不会被覆盖');" label="测试按钮事件不会被覆盖"/>
38. </mx:Canvas>
39. <mx:Button click="Alert.show('ooo');" label="ooo"/>
40. </mx:VBox>
41. </mx:Application>