package gs.easing {
    public class Quart {
        public static function easeIn (t:Number, b:Number, c:Number, d:Number):Number {
            return c*(t/=d)*t*t*t + b;
        }
        public static function easeOut (t:Number, b:Number, c:Number, d:Number):Number {
            return -c * ((t=t/d-1)*t*t*t - 1) + b;
        }
        public static function easeInOut (t:Number, b:Number, c:Number, d:Number):Number {
            if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
            return -c/2 * ((t-=2)*t*t*t - 2) + b;
        }
    }
}