| // Copyright 2006 The Closure Library Authors. All Rights Reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS-IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| /** |
| * @fileoverview Easing functions for animations. |
| * |
| * @author arv@google.com (Erik Arvidsson) |
| */ |
| |
| goog.provide('goog.fx.easing'); |
| |
| |
| /** |
| * Ease in - Start slow and speed up. |
| * @param {number} t Input between 0 and 1. |
| * @return {number} Output between 0 and 1. |
| */ |
| goog.fx.easing.easeIn = function(t) { |
| return goog.fx.easing.easeInInternal_(t, 3); |
| }; |
| |
| |
| /** |
| * Ease in with specifiable exponent. |
| * @param {number} t Input between 0 and 1. |
| * @param {number} exp Ease exponent. |
| * @return {number} Output between 0 and 1. |
| * @private |
| */ |
| goog.fx.easing.easeInInternal_ = function(t, exp) { |
| return Math.pow(t, exp); |
| }; |
| |
| |
| /** |
| * Ease out - Start fastest and slows to a stop. |
| * @param {number} t Input between 0 and 1. |
| * @return {number} Output between 0 and 1. |
| */ |
| goog.fx.easing.easeOut = function(t) { |
| return goog.fx.easing.easeOutInternal_(t, 3); |
| }; |
| |
| |
| /** |
| * Ease out with specifiable exponent. |
| * @param {number} t Input between 0 and 1. |
| * @param {number} exp Ease exponent. |
| * @return {number} Output between 0 and 1. |
| * @private |
| */ |
| goog.fx.easing.easeOutInternal_ = function(t, exp) { |
| return 1 - goog.fx.easing.easeInInternal_(1 - t, exp); |
| }; |
| |
| |
| /** |
| * Ease out long - Start fastest and slows to a stop with a long ease. |
| * @param {number} t Input between 0 and 1. |
| * @return {number} Output between 0 and 1. |
| */ |
| goog.fx.easing.easeOutLong = function(t) { |
| return goog.fx.easing.easeOutInternal_(t, 4); |
| }; |
| |
| |
| /** |
| * Ease in and out - Start slow, speed up, then slow down. |
| * @param {number} t Input between 0 and 1. |
| * @return {number} Output between 0 and 1. |
| */ |
| goog.fx.easing.inAndOut = function(t) { |
| return 3 * t * t - 2 * t * t * t; |
| }; |