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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.
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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 * Math.cos(t / d * (Math.PI / 2)) + c + b;
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- },
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-
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- /**
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- * Calculates a senoidal 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 * Math.sin(t / d * (Math.PI / 2)) + b;
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- },
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-
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- /**
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- * Calculates a senoidal 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)
|
|
|
|
- {
|
|
|
|
- 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;
|
|
|
|
- },
|
|
|
|
-
|
|
|
|
- /**
|
|
|
|
- * Calculates a bounce 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)
|
|
|
|
- {
|
|
|
|
- if ((t /= d) < (1 / 2.75))
|
|
|
|
- return c * (7.5625 * t * t) + b;
|
|
|
|
- else if (t < (2 / 2.75))
|
|
|
|
- return c * (7.5625 * (t -= (1.5 / 2.75)) * t + .75) + b;
|
|
|
|
- else if (t < (2.5 / 2.75))
|
|
|
|
- return c * (7.5625 * (t -= (2.25 / 2.75)) * t + .9375) + b;
|
|
|
|
- else
|
|
|
|
- return c * (7.5625 * (t -= (2.625 / 2.75)) * t + .984375) + b;
|
|
|
|
- },
|
|
|
|
-
|
|
|
|
- /**
|
|
|
|
- * Calculates a bounce 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) return Easings.Bounce.easeIn(t * 2, 0, c, d) * .5 + b;
|
|
|
|
- return Easings.Bounce.easeOut(t * 2 - d, 0, c, d) * .5 + c * .5 + b;
|
|
|
|
- }
|
|
|
|
- },
|
|
|
|
-}
|
|
|