[ActionScript 3.0] AS3动态改变注册点

package
{
    import flash.display.DisplayObject;
    import flash.display.DisplayObjectContainer;
    import flash.display.GradientType;
    import flash.display.Shape;
    import flash.display.Sprite;
    import flash.events.MouseEvent;
    import flash.geom.Matrix;
    import flash.geom.Point;
    import flash.text.TextField;
    import flash.utils.getQualifiedClassName;
    
    /**
     * @author Frost.Yen
     * @E-mail 871979853@qq.com
     * @create 2015-10-12 下午4:28:13
     *
     */
    [SWF(width="800",height="600")]
    public class DynamicRegistration extends Sprite
    {
        private var _obj:Sprite;
        private var _pot:Shape;
        private var _value:Number = 1;
        private var _property:Array = ["width","height","scaleX","scaleY","rotation"];
        private var _currPro:String = "width";
        public function DynamicRegistration()
        {
            initViews();
            initEventListeners();
        }
        private function initViews():void
        {
            var matr:Matrix = new Matrix();
            matr.createGradientBox(480, 100, 0, 0, 0);

            _pot = new Shape();
            _obj = new Sprite();
            _obj.graphics.beginGradientFill(GradientType.LINEAR,[0xFF0000, 0xFF00FF],[1,1],[0,255],matr);
            _obj.graphics.drawRect(0,0,200,150);
            _obj.graphics.endFill();
            _obj.x = (stage.stageWidth - _obj.width )*0.5;
            _obj.y = (stage.stageHeight - _obj.height)*0.5;
            _pot.graphics.beginFill(0,.5);
            _pot.graphics.drawCircle(0,0,5);
            _pot.graphics.endFill();
            _pot.x = _obj.x;
            _pot.y = _obj.y;
            for(var i:int = 0;i<_property.length;i++){
                var pro:TextField = getButton("   "+_property[i]+"   ",this,stage.stageWidth-100,150+30*i,_property[i]);
                pro.addEventListener(MouseEvent.CLICK,onSelectProperty);
            }
            setProState(_currPro);
            this.addChild(_obj);
            this.addChild(_pot);
        }
        private function initEventListeners():void
        {
            _obj.addEventListener(MouseEvent.CLICK,onClick);
        }
        
        private function onClick(e:MouseEvent):void
        {
            _value = _obj[_currPro];
            switch(_currPro){
                case _property[0]:
                case _property[1]:
                    _value+=10;
                    break;
                case _property[2]:
                case _property[3]:
                    _value+=0.2;
                    break;
                case _property[4]:
                    _value+=20;
                    break;
            }
            dynamicRegistration1(_obj,new Point(_obj.mouseX,_obj.mouseY),_currPro,_value);
            _pot.x = mouseX;
            _pot.y = mouseY;
        }
        private function onSelectProperty(e:MouseEvent):void
        {
            _currPro = e.currentTarget.name;
            setProState(_currPro);
        }
        private function setProState(pro:String):void
        {
            for(var i:int = 0;i<_property.length;i++){
                if(_property[i] == pro){
                    (this.getChildByName(_property[i]) as TextField).borderColor = 0x00ffff; 
                }else{
                    (this.getChildByName(_property[i]) as TextField).borderColor = 0x222222;
                }
            }
        }
        private function getButton(text:String,parent:Sprite,x:Number=0,y:Number=0,name:String=null):TextField
        {
            var textButton:TextField = new TextField();
            textButton.autoSize = "left";
            textButton.width = 110;
            textButton.height = 38;
            textButton.selectable = false;
            textButton.border = true;
            textButton.borderColor = 0x222222;
            textButton.background = true;
            textButton.backgroundColor = 0xaaaaaa;
            textButton.htmlText = "<a href='event:#'>"+text+"</a>";
            textButton.x = x;
            textButton.y = y;
            if(name!=null){
                textButton.name = name;
            }
            parent.addChild(textButton);
            return textButton;
        }
        
        /**
         * 动态改变注册点
         * target     改变注册点的对象
         * point     新的注册点
         * pro         需要改变的属性
         * value     新的属性值
         */
        private function dynamicRegistration1(target:DisplayObject,point:Point,pro:String,value:Number):void
        {
            //转换为全局坐标
            var A:Point=target.parent.globalToLocal(target.localToGlobal(point));
            if(pro == "x"||pro == "y"){
                target[pro] = value-point[pro];
            }else{
                target[pro]=value;
                var B:Point = target.parent.globalToLocal(target.localToGlobal(point));
                //把注册点从B点移到A点
                target.x+=A.x-B.x;
                target.y+=A.y-B.y;
            }
        }
    }
    
}