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

module Kiwi.Animations.Tweens.Easing {

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

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

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

			return 1 - Math.cos(k * Math.PI / 2);

		}

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

			return Math.sin(k * Math.PI / 2);

		}

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

			return 0.5 * (1 - Math.cos(Math.PI * k));

		}

	}

}