[AS3]as3画笔实例实现橡皮擦功能源代码

[AS3]as3画笔实例实现橡皮擦功能源代码

    //主容器
    var main:Sprite = new Sprite();
    main.mouseEnabled = false;
    addChild(main)
    //临时容器(所有操作都将先画在临时容器里,再进行"画"或"擦")
    var mc:Sprite = new Sprite()
    main.addChild(mc)
    //保存最终画出来的内容的bitmapdata
    var content:BitmapData = new BitmapData(550,400,true,0x00FFFFFF);
    //把content显示出来
    var show:Bitmap = new Bitmap(content)
    main.addChildAt(show,0) 

    //默认选中画笔
    var action:Number = 0
    txt.text = "当前选中:画笔" 

    mc_move.addEventListener(MouseEvent.MOUSE_DOWN,startDraw)
    a.addEventListener(MouseEvent.CLICK,changeAction)
    b.addEventListener(MouseEvent.CLICK,changeAction)
    function changeAction(e:MouseEvent):void
    {
        if(e.target.name == "a")
        {
            action = 0
            txt.text = "当前选中:画笔"
            mc.visible = true
        }else
        {
            action = 1
            txt.text = "当前选中:橡皮"
            mc.visible = false
        }
    }
    function startDraw(e:MouseEvent):void
    {
        mc.graphics.lineStyle(20,cp.selectedColor);
        mc.graphics.moveTo(mouseX,mouseY);
        mc_move.addEventListener(MouseEvent.MOUSE_MOVE,drawing);
        stage.addEventListener(MouseEvent.MOUSE_UP,stopDraw);
    }
    function stopDraw(e:MouseEvent):void
    {
        if(action!=1)content.draw(mc,new Matrix(),new ColorTransform(),BlendMode.NORMAL,new Rectangle(0,0,550,400))
        mc.graphics.clear()
        mc_move.removeEventListener(MouseEvent.MOUSE_MOVE,drawing);
        stage.removeEventListener(MouseEvent.MOUSE_UP,stopDraw);
    }
    function drawing(e:MouseEvent):void
    {
        mc.graphics.lineTo(mouseX,mouseY)
        if(action==1)content.draw(mc,new Matrix(),new ColorTransform(),BlendMode.ERASE)
        e.updateAfterEvent()
    }

[AS3]as3画笔实例实现橡皮擦功能源代码