flex 画图,操作图形例子，（图表，曲线，都可用此思路）
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<?xml version="1.0" encoding="utf-8"?><mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" applicationComplete="init()"><mx:Style>ToolTip{background-color:#FFCCFF;font-size:12px;}</mx:Style><mx:Script><![CDATA[// 这个是画一个简单的图形并能清除他import mx.controls.ToolTip;import mx.printing.FlexPrintJob;import printView;import mx.core.UIComponent;import mx.controls.Alert;private var _sperite:Sprite; private var _sperite2:Sprite; private var tt:ToolTip = new ToolTip();private function init(){_sperite = new Sprite();//建立影片精灵 _sperite2 = new Sprite();//建立影片精灵 var uicomponent:UIComponent = new UIComponent();uicomponent.addChild(_sperite);uicomponent.addChild(_sperite2);box.addChild(uicomponent);doDraw();}function doDraw():void{tt.text="加饭要吃饱呀";tt.width = 120;tt.height = 120;tt.x = 616;tt.y = 42;tt.visible = false;button1.addChild(tt);_sperite.graphics.lineStyle(1,0xA8A8A8,1);_sperite.graphics.moveTo(0,0);_sperite.graphics.lineTo(100,100);_sperite2.graphics.lineStyle(1,0xFFCC99,1);_sperite2.graphics.beginFill(0xFFCC99,1);_sperite2.graphics.drawCircle(50,50,20);_sperite2.graphics.endFill();_sperite2.addChild(tt); _sperite2.addEventListener(MouseEvent.MOUSE_OVER,showTip);_sperite2.addEventListener(MouseEvent.MOUSE_OUT,hideTip);}function showTip(event:MouseEvent){tt.visible = true;tt.x = event.localX;tt.y = event.localY;this.graphics.beginFill(0x6699FF,1);this.graphics.endFill();}function hideTip(event:MouseEvent){tt.visible = false;}function doClean():void{_sperite2.graphics.clear();}]]></mx:Script><mx:Button x="616" y="42" label="清除" id="button1" click="doClean()"/><mx:Canvas id="canvas" x="10" y="42" height="400" width="500" backgroundColor="#FFFFCC" ><mx:Canvas id="box" x="0" y="0" ></mx:Canvas></mx:Canvas><mx:Label x="147" y="16" text="这个是画一个简单的图形并能清除他" fontSize="12"/></mx:Application>