关键点：知道如何画线就行了，代码不复杂，直接看吧（从同事一本书上抄的）
01 var drawing:Boolean;
02
03 Mouse.hide(); //隐藏默认的光标
04
05 stage.addEventListener(MouseEvent.MOUSE_MOVE,Stage_MouseMove);
06 stage.addEventListener(MouseEvent.MOUSE_DOWN,Stage_MouseDown);
07 stage.addEventListener(MouseEvent.MOUSE_UP,Stage_MouseUp);
08 stage.addEventListener(KeyboardEvent.KEY_DOWN,Stage_KeyDown);
09
10 function Stage_MouseDown(e:MouseEvent):void {
11 this.graphics.moveTo(this.mouseX,this.mouseY);//设置划线的起点
12 this.graphics.lineStyle(3,0x99cc00,100);//设置笔触大小及颜色
13 drawing=true;
14 }
15
16
17 function Stage_MouseMove(e:MouseEvent):void {
18 //铅笔鼠标跟随
19 pen1.x=this.mouseX;
20 pen1.y=this.mouseY;
21
22 if (drawing) {
23 this.graphics.lineTo(this.mouseX,this.mouseY);//关键代码就在这里
24 }
25 e.updateAfterEvent();
26 }
27
28 function Stage_MouseUp(e:MouseEvent):void {
29 drawing=false;
30 }
31
32 function Stage_KeyDown(e:KeyboardEvent):void {
33 if (e.keyCode==Keyboard.DELETE) { //注意这里：虽然代码只写了Delete键，但实际测试中发现如果按Ctrl + Delete组合键，也能触发
34 this.graphics.clear();
35 }
36 }
做为对比，大家也可以参看:silverlight：手写板/涂鸦/墨迹/InkPresenter示例程序