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

module Kiwi.Animations.Tweens.Easing {

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

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

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

			return k === 0 ? 0 : Math.pow(1024, k - 1);

		}

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

			return k === 1 ? 1 : 1 - Math.pow(2, -10 * k);

		}

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

			if (k === 0) return 0;
			if (k === 1) return 1;
			if ((k *= 2) < 1) return 0.5 * Math.pow(1024, k - 1);
			return 0.5 * (-Math.pow(2, -10 * (k - 1)) + 2);

		}

	}

}