Flex 画线的方法

 public var lines1 :flash.display.Sprite = new Sprite (); //

lines1.graphics.lineStyle(2,0x0099ff,1);//设置颜色 粗细

lines1.graphics.moveTo(uFrom.x+uFrom.width/2,uFrom.y+uFrom.height/2); //从某个坐标开始

lines1.graphics.lineTo(uTo.x+uTo.width/2,uTo.y+uTo.height/2); //画到某个坐标

//因为addChild方法 不能识别 非继承mc.core.UIComponent的控件  所以先声明一个组件 把控件放进去然后在放进界面中

var comp: UIComponent = new UIComponent();

comp.addChild(lines);

addChild(comp);

再flex 3 IDE Flex Builder 3 beta 3下编译通过

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" borderColor="#FFFFFF" >   
    <mx:Script>
        <![CDATA[
            import mx.effects.Move;
            import mx.controls.*;
            import mx.core.*;
            import mx.effects.*;
            public var lines :Sprite =  new Sprite ();
            public var lines1 :flash.display.Sprite =  new Sprite ();
            

            
            public function TestPaint():void
            {
                //Alert.show("Hello World!");
                lines.graphics.lineStyle(2,0x0099ff,1);
                DrawLine(lines,lbl,btn1);
                DrawLine(lines,lbl,btn2);
                DrawLine(lines,lbl,btn3);
                   var comp: UIComponent = new UIComponent();
                   comp.addChild(lines);
                   addChild(comp);
            }
            
            public function DrawLine(lines:Sprite,uFrom:UIComponent,uTo:UIComponent):void
            {
                lines.graphics.moveTo(uFrom.x+uFrom.width/2,uFrom.y+uFrom.height/2);
                lines.graphics.lineTo(uTo.x+uTo.width/2,uTo.y+uTo.height/2);
            }
            
            
            public function btn1_mouseOver(event:Event):void
            {
                lines1.graphics.lineStyle(2,0xd43dd6,1);
                DrawLine(lines1,btn1,btn2);
                DrawLine(lines1,btn1,lbl);
                   var comp: UIComponent = new UIComponent();
                   comp.addChild(lines1);
                   addChild(comp);
            }
            public function btn1_mouseOut(event:Event):void
            {
                lines1.graphics.clear();
                DrawLine(lines,lbl,btn1);
            }
            
            
            public function Testmove():void
            {
                var move:Move = new Move();
                if(btn2.x!=lbl.x)
                {
                    move.target=btn2;
                    move.end();
                    move.xTo=lbl.x;
                    move.yTo=lbl.y;
                    move.play(); 
                }
                else
                {
                    
                    move.target=btn2;
                    move.end();
                    move.xTo=340;
                    move.yTo=104;
                    move.play(); 
                }
            }
        ]]>
    </mx:Script>
    <mx:Button x="176" y="34" label="btn1" id="btn1" mouseOver="btn1_mouseOver(event)" mouseOut="btn1_mouseOut(event)"/>
    <mx:Button x="340" y="104" label="btn4" id="btn2"/>
    <mx:Button x="53" y="167" label="btn3" id="btn3"/>
    <mx:Button x="131" y="373" label="Paint" click="TestPaint()"/>
    <mx:Label x="176" y="169" text="LblMiddle" width="71" height="20" id="lbl"/>
    <mx:Button x="303" y="324" label="Move" click="Testmove()"/>
    
</mx:Application>