Rotation with trig

by terravilor 28 Sep 2011

Embed

/**
 * Copyright terravilor ( http://wonderfl.net/user/terravilor )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/xVhO
 */

package {
    import flash.events.Event;
    import flash.display.Sprite;
    public class FlashTest extends Sprite {
        private var arrow:Arrow;
        
        public function FlashTest() {
            arrow = new Arrow();
            arrow.x = (stage.stageWidth / 2);
            arrow.y = (stage.stageHeight / 2);
            addChild(arrow);
            
            addEventListener(Event.ENTER_FRAME, onEnterFrame);
        }
        
        protected function onEnterFrame(event:Event):void {
            var dy:Number = mouseY - arrow.y;
            var dx:Number = mouseX - arrow.x;
            var radians:Number = Math.atan2(dy, dx);
            //var radians:Number = Math.atan(dy / dx); <- vai dar errado pelo fato do flash não entender o quadrante do mouse
            var degrees:Number = radians * 180 / Math.PI;
            
            arrow.rotation = degrees;
        }
    }
}


//arrow
import flash.display.Sprite;
class Arrow extends Sprite {
    public function Arrow() {
        init();
    }
    
    public function init():void {
        graphics.lineStyle(1,0,1);
        graphics.beginFill(0xff0000);
        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();
    }


}