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				|  |  | -/************************************************************************
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				|  |  | - * Easings.js
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				|  |  | - ************************************************************************
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				|  |  | - * Copyright (c) 2021 Pedro Tonini Rosenberg Schneider.
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				|  |  | - *
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				|  |  | - * This file is part of Pandora.
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				|  |  | - *
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				|  |  | - * Pandora is free software: you can redistribute it and/or modify
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				|  |  | - * it under the terms of the GNU General Public License as published by
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				|  |  | - * the Free Software Foundation, either version 3 of the License, or
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				|  |  | - * (at your option) any later version.
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				|  |  | - *
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				|  |  | - * Pandora is distributed in the hope that it will be useful,
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				|  |  | - * but WITHOUT ANY WARRANTY; without even the implied warranty of
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				|  |  | - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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				|  |  | - * GNU General Public License for more details.
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				|  |  | - *     
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				|  |  | - * You should have received a copy of the GNU General Public License     
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				|  |  | - * along with Pandora.  If not, see <https://www.gnu.org/licenses/>.
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				|  |  | - *************************************************************************/
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				|  |  | -
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				|  |  | -/**
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				|  |  | - *
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				|  |  | - * Derived from Robert Penner's easing equations: http://robertpenner.com/easing/
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				|  |  | - * The original copyright notice is as follows:
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				|  |  | - * 
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				|  |  | - * TERMS OF USE - EASING EQUATIONS
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				|  |  | - * 
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				|  |  | - * Open source under the BSD License.
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				|  |  | - * 
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				|  |  | - * Copyright © 2001 Robert Penner
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				|  |  | - * All rights reserved.
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				|  |  | - * 
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				|  |  | - * Redistribution and use in source and binary forms, with or without modification,
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				|  |  | - * are permitted provided that the following conditions are met:
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				|  |  | - * 
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				|  |  | - * Redistributions of source code must retain the above copyright notice, this list of
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				|  |  | - * conditions and the following disclaimer.
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				|  |  | - * Redistributions in binary form must reproduce the above copyright notice, this list
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				|  |  | - * of conditions and the following disclaimer in the documentation and/or other materials
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				|  |  | - * provided with the distribution.
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				|  |  | - * 
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				|  |  | - * Neither the name of the author nor the names of contributors may be used to endorse
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				|  |  | - * or promote products derived from this software without specific prior written permission.
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				|  |  | - * 
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				|  |  | - * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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				|  |  | - * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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				|  |  | - * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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				|  |  | - * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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				|  |  | - * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
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				|  |  | - * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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				|  |  | - * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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				|  |  | - * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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				|  |  | - * OF THE POSSIBILITY OF SUCH DAMAGE.
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				|  |  | - *
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				|  |  | - */
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				|  |  | -
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				|  |  | -/**
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				|  |  | - * This {@code Easings} singleton provides an interface for the engine to utilize
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				|  |  | - * various easing equations. Used mostly on the Tween GameObject. User can access this
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				|  |  | - * API, but it is not recomended; try using tweens instead.
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				|  |  | - * 
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				|  |  | - * @author Pedro Schneider
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				|  |  | - * 
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				|  |  | - * @namespace
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				|  |  | - */
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				|  |  | -const Easings = {
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				|  |  | -    // * See https://easings.net/ for more details on each type of easing.
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate linear easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Linear:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a linear easing.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        ease: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return b + (c * t / d);
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate quadratic easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Quad:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a quadratic ease-in.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeIn: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * (t /= d) * t + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quadratic ease-out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return -c * (t /= d) * (t - 2) + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quadratic ease-in and out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeInOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * t * t + b;
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				|  |  | -            return -c / 2 * ((--t) * (t - 2) - 1) + b;
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate cubic easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Cubic:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a cubic ease-in.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeIn: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * (t /= d) * t * t + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a cubic ease-out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * ((t = t / d - 1) * t * t + 1) + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a cubic ease-in and out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeInOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * t * t * t + b;
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				|  |  | -            return c / 2 * ((t -= 2) * t * t + 2) + b;
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate quartic easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Quart:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a quartic ease-in.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeIn: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * (t /= d) * t * t * t + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quartic ease-out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return -c * ((t = t / d - 1) * t * t * t - 1) + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quartic ease-in and out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeInOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * t * t * t * t + b;
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				|  |  | -            return -c / 2 * ((t -= 2) * t * t * t - 2) + b;
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate quintic easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Quint:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a quintic ease-in.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeIn: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * (t /= d) * t * t * t * t + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quintic ease-out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            return c * ((t = t / d - 1) * t * t * t * t + 1) + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a quintic ease-in and out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeInOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * t * t * t * t * t + b;
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				|  |  | -            return c / 2 * ((t -= 2) * t * t * t * t + 2) + b;
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -
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				|  |  | -    /**
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				|  |  | -     * Namespace to separate senoidal easing equations.
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				|  |  | -     * 
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				|  |  | -     * @namespace
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				|  |  | -     */
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				|  |  | -    Sine:
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				|  |  | -    {
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				|  |  | -        /**
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				|  |  | -         * Calculates a senoidal ease-in;
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return -c * Math.cos(t / d * (Math.PI / 2)) + c + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a senoidal ease-out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return c * Math.sin(t / d * (Math.PI / 2)) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a senoidal ease-in and out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeInOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return -c / 2 * (Math.cos(Math.PI * t / d) - 1) + b;
 | 
	
		
			
				|  |  | -        }
 | 
	
		
			
				|  |  | -    },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -    /**
 | 
	
		
			
				|  |  | -     * Namespace to separate exponential easing equations.
 | 
	
		
			
				|  |  | -     * 
 | 
	
		
			
				|  |  | -     * @namespace
 | 
	
		
			
				|  |  | -     */
 | 
	
		
			
				|  |  | -    Expo:
 | 
	
		
			
				|  |  | -    {
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an exponential ease-in.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return (t == 0) ? b : c * Math.pow(2, 10 * (t / d - 1)) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an exponential ease-out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return (t == d) ? b + c : c * (-Math.pow(2, -10 * t / d) + 1) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an exponential ease-in and out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeInOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            if (t == 0) return b;
 | 
	
		
			
				|  |  | -            if (t == d) return b + c;
 | 
	
		
			
				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * Math.pow(2, 10 * (t - 1)) + b;
 | 
	
		
			
				|  |  | -            return c / 2 * (-Math.pow(2, -10 * --t) + 2) + b;
 | 
	
		
			
				|  |  | -        }
 | 
	
		
			
				|  |  | -    },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -    /**
 | 
	
		
			
				|  |  | -     * Namespace to separate circular easing equations.
 | 
	
		
			
				|  |  | -     * 
 | 
	
		
			
				|  |  | -     * @namespace
 | 
	
		
			
				|  |  | -     */
 | 
	
		
			
				|  |  | -    Circ:
 | 
	
		
			
				|  |  | -    {
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a circular ease-in.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return -c * (Math.sqrt(1 - (t /= d) * t) - 1) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a circular ease-out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return c * Math.sqrt(1 - (t = t / d - 1) * t) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a circular ease-in and out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeInOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            if ((t /= d / 2) < 1) return -c / 2 * (Math.sqrt(1 - t * t) - 1) + b;
 | 
	
		
			
				|  |  | -            return c / 2 * (Math.sqrt(1 - (t -= 2) * t) + 1) + b;
 | 
	
		
			
				|  |  | -        }
 | 
	
		
			
				|  |  | -    },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -    /**
 | 
	
		
			
				|  |  | -     * Namespace to separate elastic easing equations.
 | 
	
		
			
				|  |  | -     * 
 | 
	
		
			
				|  |  | -     * @namespace
 | 
	
		
			
				|  |  | -     */
 | 
	
		
			
				|  |  | -    Elastic:
 | 
	
		
			
				|  |  | -    {
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an elastic ease-in.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            var p = 0;
 | 
	
		
			
				|  |  | -            var a = c;
 | 
	
		
			
				|  |  | -            if (t == 0) return b;
 | 
	
		
			
				|  |  | -            if ((t /= d) == 1) return b + c;
 | 
	
		
			
				|  |  | -            if (!p) p = d * .3;
 | 
	
		
			
				|  |  | -            if (a < Math.abs(c))
 | 
	
		
			
				|  |  | -            {
 | 
	
		
			
				|  |  | -                a = c;
 | 
	
		
			
				|  |  | -                var s = p / 4;
 | 
	
		
			
				|  |  | -            }
 | 
	
		
			
				|  |  | -            else var s = p / (2 * Math.PI) * Math.asin(c / a);
 | 
	
		
			
				|  |  | -            return -(a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an elastic ease-out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            var p = 0;
 | 
	
		
			
				|  |  | -            var a = c;
 | 
	
		
			
				|  |  | -            if (t == 0) return b;
 | 
	
		
			
				|  |  | -            if ((t /= d) == 1) return b + c;
 | 
	
		
			
				|  |  | -            if (!p) p = d * .3;
 | 
	
		
			
				|  |  | -            if (a < Math.abs(c))
 | 
	
		
			
				|  |  | -            {
 | 
	
		
			
				|  |  | -                a = c;
 | 
	
		
			
				|  |  | -                var s = p / 4;
 | 
	
		
			
				|  |  | -            }
 | 
	
		
			
				|  |  | -            else var s = p / (2 * Math.PI) * Math.asin(c / a);
 | 
	
		
			
				|  |  | -            return a * Math.pow(2, -10 * t) * Math.sin((t * d - s) * (2 * Math.PI) / p) + c + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates an elastic ease-in and out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeInOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            var p = 0;
 | 
	
		
			
				|  |  | -            var a = c;
 | 
	
		
			
				|  |  | -            if (t == 0) return b;
 | 
	
		
			
				|  |  | -            if ((t /= d / 2) == 2) return b + c;
 | 
	
		
			
				|  |  | -            if (!p) p = d * (.3 * 1.5);
 | 
	
		
			
				|  |  | -            if (a < Math.abs(c))
 | 
	
		
			
				|  |  | -            {
 | 
	
		
			
				|  |  | -                a = c;
 | 
	
		
			
				|  |  | -                var s = p / 4;
 | 
	
		
			
				|  |  | -            }
 | 
	
		
			
				|  |  | -            else var s = p / (2 * Math.PI) * Math.asin(c / a);
 | 
	
		
			
				|  |  | -            if (t < 1) return -.5 * (a * Math.pow(2, 10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p)) + b;
 | 
	
		
			
				|  |  | -            return a * Math.pow(2, -10 * (t -= 1)) * Math.sin((t * d - s) * (2 * Math.PI) / p) * .5 + c + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -    },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -    /**
 | 
	
		
			
				|  |  | -     * Namespace to separate back easing equations.
 | 
	
		
			
				|  |  | -     * 
 | 
	
		
			
				|  |  | -     * @namespace
 | 
	
		
			
				|  |  | -     */
 | 
	
		
			
				|  |  | -    Back:
 | 
	
		
			
				|  |  | -    {
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a back ease-in.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            return c * (t /= d) * t * ((s + 1) * t - s) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a back ease-out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a back ease-in and out.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeInOut: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            var s = 1.70158;
 | 
	
		
			
				|  |  | -            if ((t /= d / 2) < 1) return c / 2 * (t * t * (((s *= (1.525)) + 1) * t - s)) + b;
 | 
	
		
			
				|  |  | -            return c / 2 * ((t -= 2) * t * (((s *= (1.525)) + 1) * t + s) + 2) + b;
 | 
	
		
			
				|  |  | -        }
 | 
	
		
			
				|  |  | -    },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -    /**
 | 
	
		
			
				|  |  | -     * Namespace to separate bounce easing equations.
 | 
	
		
			
				|  |  | -     * 
 | 
	
		
			
				|  |  | -     * @namespace
 | 
	
		
			
				|  |  | -     */
 | 
	
		
			
				|  |  | -    Bounce:
 | 
	
		
			
				|  |  | -    {
 | 
	
		
			
				|  |  | -        /**
 | 
	
		
			
				|  |  | -         * Calculates a bounce ease-in.
 | 
	
		
			
				|  |  | -         * 
 | 
	
		
			
				|  |  | -         * @param {number} t    current time of the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} b    beginning value of the esasing process.
 | 
	
		
			
				|  |  | -         * @param {number} c    change in vlaue during the easing process.
 | 
	
		
			
				|  |  | -         * @param {number} d    total duration of the easing process.
 | 
	
		
			
				|  |  | -         *  
 | 
	
		
			
				|  |  | -         * @returns {number}    current value in the easing process.
 | 
	
		
			
				|  |  | -         */
 | 
	
		
			
				|  |  | -        easeIn: function(t, b, c, d)
 | 
	
		
			
				|  |  | -        {
 | 
	
		
			
				|  |  | -            return c - Easings.Bounce.easeOut(d - t, 0, c, d) + b;
 | 
	
		
			
				|  |  | -        },
 | 
	
		
			
				|  |  | -
 | 
	
		
			
				|  |  | -        /**
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				|  |  | -         * Calculates a bounce ease-out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if ((t /= d) < (1 / 2.75))
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				|  |  | -                return c * (7.5625 * t * t) + b;
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				|  |  | -            else if (t < (2 / 2.75))
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				|  |  | -                return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
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				|  |  | -            else if (t < (2.5 / 2.75))
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				|  |  | -                return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
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				|  |  | -            else
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				|  |  | -                return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
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				|  |  | -        },
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				|  |  | -
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				|  |  | -        /**
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				|  |  | -         * Calculates a bounce ease-in and out.
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				|  |  | -         * 
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				|  |  | -         * @param {number} t    current time of the easing process.
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				|  |  | -         * @param {number} b    beginning value of the esasing process.
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				|  |  | -         * @param {number} c    change in vlaue during the easing process.
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				|  |  | -         * @param {number} d    total duration of the easing process.
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				|  |  | -         *  
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				|  |  | -         * @returns {number}    current value in the easing process.
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				|  |  | -         */
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				|  |  | -        easeInOut: function(t, b, c, d)
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				|  |  | -        {
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				|  |  | -            if (t < d / 2) return Easings.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
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				|  |  | -            return Easings.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
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				|  |  | -        }
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				|  |  | -    },
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				|  |  | -}
 |