package
{
        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 @ax-lib-flex-animation-code-01-BitmapCollision-BitmapCollision3 extends Sprite
        {
                private var bmpd1:BitmapData;
                private var bmpd2:BitmapData;
                private var star1:Star;
                private var star2:Star;
                
                public function @ax-lib-flex-animation-code-01-BitmapCollision-BitmapCollision3()
                {
                        stage.align = StageAlign.TOP_LEFT;
                        stage.scaleMode = StageScaleMode.NO_SCALE;
                        
                        // make two stars, add to stage
                        star1 = new Star(50);
                        addChild(star1);
                        
                        star2 = new Star(50);
                        star2.x = 200;
                        star2.y = 200;
                        addChild(star2);
                        
                        // make two bitmaps, not on stage
                        bmpd1 = new BitmapData(stage.stageWidth, stage.stageHeight, true, 0);                        
                        bmpd2 = bmpd1.clone();
                        
                        stage.addEventListener(MouseEvent.MOUSE_MOVE, onMouseMoving);
                }
                
                private function onMouseMoving(event:MouseEvent):void
                {
                        // move star1 to the mouse position
                        star1.x = mouseX;
                        star1.y = mouseY;
                        
                        // clear the bitmaps
                        bmpd1.fillRect(bmpd1.rect, 0);
                        bmpd2.fillRect(bmpd2.rect, 0);
                        
            // draw one star to each bitmap
                        bmpd1.draw(star1, new Matrix(1, 0, 0, 1, star1.x, star1.y));
                        bmpd2.draw(star2, new Matrix(1, 0, 0, 1, star2.x, star2.y));
                        
                        // the hit test itself.
                        if(bmpd1.hitTest(new Point(), 255, bmpd2, new Point(), 255))
                        {
                                star1.filters = [new GlowFilter()];
                                star2.filters = [new GlowFilter()];
                        }
                        else
                        {
                                star1.filters = [];
                                star2.filters = [];
                        }
                }
        }}