【AS3代码】精确到点的不规则图形碰撞检测

package
{
    import com.ui.Star;
    
    import flash.display.Bitmap;
    import flash.display.BitmapData;
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.MouseEvent;
    import flash.filters.GlowFilter;
    import flash.geom.Matrix;
    import flash.geom.Point;
    
    public class Main extends Sprite
    {
        private var bmpd1:BitmapData;
        private var bmp1:Bitmap;
        private var bmpd2:BitmapData;
        private var bmp2:Bitmap;
        
        public function Main():void
        {            
            init();
        }
        private function init():void
        {
            stage.align = StageAlign.TOP_LEFT;
            stage.scaleMode = StageScaleMode.NO_SCALE;
            
            var star:Star = new Star(50);
            
            bmpd1 = new BitmapData(100,100,true,0);
            bmpd1.draw(star, new Matrix(1,0,0,1,50,50));
            bmp1 = new Bitmap(bmpd1);
            bmp1.x = 200;
            bmp1.y = 200;
            this.addChild(bmp1);
            
            bmpd2 = new BitmapData(100,100,true,0);
            bmpd2.draw(star, new Matrix(1,0,0,1,50,50));
            bmp2 = new Bitmap(bmpd2);
            this.addChild(bmp2);
            
            stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMoving);
        }
        private function onMouseMoving(event:MouseEvent):void
        {
            bmp2.x = mouseX - 50;
            bmp2.y = mouseY - 50;
            
            if(bmpd1.hitTest(new Point(bmp1.x, bmp1.y), 255, bmpd2, new Point(bmp2.x, bmp2.y), 255))
            {
                bmp1.filters = [new GlowFilter()];
                bmp2.filters = [new GlowFilter()];
            }
            else
            {
                bmp1.filters = [];
                bmp2.filters = [];
            }
        }
    }
}