Flash 位图九宫格 -- 组件应用

package{    import flash.display.Sprite;    import flash.display.Bitmap;    import flash.display.BitmapData;    import flash.geom.Rectangle;    import flash.geom.Point;    /**     *位图九宫格实现     * @author lxh     *     */        public class BitmapScale9Grid extends Sprite    {        private var source : Bitmap;        private var scaleGridTop : Number;        private var scaleGridBottom : Number;        private var scaleGridLeft : Number;        private var scaleGridRight : Number;                private var leftUp : Bitmap;        private var leftCenter : Bitmap;        private var leftBottom : Bitmap;        private var centerUp : Bitmap;        private var center : Bitmap;        private var centerBottom : Bitmap;        private var rightUp : Bitmap;        private var rightCenter : Bitmap;        private var rightBottom : Bitmap;                private var _width : Number;        private var _height : Number;                private var minWidth : Number;        private var minHeight : Number;                public function BitmapScale9Grid(source:Bitmap,                                         scaleGridTop:Number,                                         scaleGridBottom:Number,                                         scaleGridLeft:Number,                                         scaleGridRight:Number )        {            this.source = source;            this.scaleGridTop = scaleGridTop;            this.scaleGridBottom = scaleGridBottom;            this.scaleGridLeft = scaleGridLeft;            this.scaleGridRight = scaleGridRight;            init();                    }                private function init() : void        {            _width = source.width;            _height = source.height;                        leftUp = getBitmap(0, 0, scaleGridLeft, scaleGridTop);            this.addChild(leftUp);                        leftCenter = getBitmap(0, scaleGridTop, scaleGridLeft, scaleGridBottom - scaleGridTop);            this.addChild(leftCenter);                        leftBottom = getBitmap(0, scaleGridBottom, scaleGridLeft, source.height - scaleGridBottom);            this.addChild(leftBottom);                        centerUp = getBitmap(scaleGridLeft, 0, scaleGridRight - scaleGridLeft, scaleGridTop);            this.addChild(centerUp);                        center = getBitmap(scaleGridLeft, scaleGridTop, scaleGridRight - scaleGridLeft, scaleGridBottom - scaleGridTop);            this.addChild(center);                        centerBottom = getBitmap(scaleGridLeft, scaleGridBottom, scaleGridRight - scaleGridLeft, source.height - scaleGridBottom);            this.addChild(centerBottom);                        rightUp = getBitmap(scaleGridRight, 0, source.width - scaleGridRight, scaleGridTop);            this.addChild(rightUp);                        rightCenter = getBitmap(scaleGridRight, scaleGridTop, source.width - scaleGridRight, scaleGridBottom - scaleGridTop);            this.addChild(rightCenter);                        rightBottom = getBitmap(scaleGridRight, scaleGridBottom, source.width - scaleGridRight, source.height - scaleGridBottom);            this.addChild(rightBottom);                        minWidth = leftUp.width + rightBottom.width;            minHeight = leftBottom.height + rightBottom.height;        }                private function getBitmap(x:Number, y:Number, w:Number, h:Number) : Bitmap        {            var bit:BitmapData = new BitmapData(w, h);            bit.copyPixels(source.bitmapData, new Rectangle(x, y, w, h), new Point(0, 0));            var bitMap:Bitmap = new Bitmap(bit);            bitMap.x = x;            bitMap.y = y;            return bitMap;        }                override public function set width(w : Number) : void        {            if(w < minWidth)            {                w = minWidth;            }            _width = w;            refurbishSize();        }                override public function set height(h : Number) : void        {            if(h < minHeight)            {                h = minHeight;            }            _height = h;            refurbishSize();        }                private function refurbishSize() : void        {            leftCenter.height = _height - leftUp.height - leftBottom.height;            leftBottom.y = _height - leftBottom.height;            centerUp.width = _width - leftUp.width - rightUp.width;            center.width = centerUp.width;            center.height = leftCenter.height;            centerBottom.width = center.width;            centerBottom.y = leftBottom.y;            rightUp.x = _width - rightUp.width;            rightCenter.x = rightUp.x;            rightCenter.height = center.height;            rightBottom.x = rightUp.x;            rightBottom.y = leftBottom.y;        }    }}