/**
*   
* @module Tweens
* @submodule Easing 
* 
*/


module Kiwi.Animations.Tweens.Easing {

	/**
	*
	* @class Quartic
	* @namespace Kiwi.Animations.Tweens.Easing
	*
	*/
	export class Quartic {

		/**
		* The type of object that this is.
		* @method objType
		* @return {String} "Quartic"
		* @public
		*/
		public objType() {
			return "Quartic";
		}

		/** 
		* 
		* @method In
		* @param k {Any}
		* @return {String}
		* @static
		* @public
		*/
		public static In(k) {

			return k * k * k * k;

		}

		/** 
		* 
		* @method Out
		* @param k {Any}
		* @return {String}
		* @static
		* @public
		*/
		public static Out(k) {

			return 1 - (--k * k * k * k);

		}

		/** 
		* 
		* @method InOut
		* @param k {Any}
		* @return {String}
		* @static
		* @public
		*/
		public static InOut(k) {

			if ((k *= 2) < 1) return 0.5 * k * k * k * k;
			return -0.5 * ((k -= 2) * k * k * k - 2);

		}

	}

}