角度转向-鼠标跟随

1，构建精灵

 

package 
{
    import flash.display.Sprite;
    public class Arrow extends Sprite
    {
        public function Arrow()
        {
            init();
        }
        public function init():void
        {
            graphics.lineStyle(1,0,1);
            graphics.beginFill(0xffff00);
            graphics.moveTo(-50,-25);
            graphics.lineTo(0,-25);
            graphics.lineTo(0,-50);
            graphics.lineTo(50,0);
            graphics.lineTo(0,50);
            graphics.lineTo(0,25);
            graphics.lineTo(-50,25);
            graphics.lineTo(-50,-25);
            graphics.endFill();
        }
    }
}

 

2，跟随动画

 

package 
{
    import flash.events.Event;
    import flash.display.Sprite;

    public class FollowMouse extends Sprite
    {
        private var myArrow:Arrow;
        public function FollowMouse ()
        {
            Init ();
        }
        private function Init ():void
        {
            myArrow=new Arrow()  ;
            addChild (myArrow);

            myArrow.scaleX=0.5;
            myArrow.scaleY=0.3;
            myArrow.x=stage.stageWidth / 2;
            myArrow.y=stage.stageHeight / 2;

            myArrow.addEventListener (Event.ENTER_FRAME,Active);
        }
        private function Active (e:Event):void
        {
            var vx:Number=0;
            var vy:Number=0;
            var ax:Number=(mouseX - myArrow.x)/5;
            var ay:Number=(mouseY - myArrow.y)/5;
            vx+= ax;
            vy+= ay;
            myArrow.x+= vx;
            myArrow.y+= vy;
            
            var angle:Number=Math.atan2(ay,ax);
            myArrow.rotation=angle*180/Math.PI;
        }
    }
}