flash on 2010-11-10

/**
 * Copyright geko ( http://wonderfl.net/user/geko )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/i9RG
 */

package {
    import flash.display.Sprite;
    public class Ball extends Sprite {
        private var ax:Number = 0;
        private var ay:Number = 0;
        
        public function Ball(color:uint = 0x000000, alpha:Number = 1, radius:Number = 20) {
            graphics.beginFill(color, alpha);
            graphics.drawCircle(0, 0, radius);
            graphics.endFill();
        }
        
        public function move(_x:Number = 0, _y:Number = 0):void{
            x = _x;
            y = _y;
        }
        
        public function translate(_x:Number = 0, _y:Number = 0):void{
            x += _x;
            y += _y;
        }
        
        public function spring(_x:Number = 0, _y:Number = 0):void{
            ax += _x;
            ay += _y;
            ax *= 0.9;
            ay *= 0.9;
            x += ax;
            y += ay;
        }
    }
}