/// <reference path="../../Game.ts" />

/**
 *	Phaser - Easing
 *
 *	@desc 		Based heavily on tween.js by sole (https://github.com/sole/tween.js)
 *
 *	@version 	1.0 - 11th January 2013
 *
 *	@author 	Richard Davey, TypeScript conversion and Phaser integration. See Phaser.TweenManager for the full tween.js author list
 */

module Phaser.Easing {

    export class Exponential {

        public static In(k) {

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

        }

        public static Out(k) {

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

        }

        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);

        }

    }

}