[AS3]as3版更为精确的不规则图形碰撞检测写法示例

[AS3]as3版更为精确的不规则图形碰撞检测写法示例

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 = []; 
            } 
        } 
    } 
}