sku-pg/support/closure-library/closure/goog/fx/easing.js

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// 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.
 *
 */

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 t * t * t;
};


/**
 * 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 1 - Math.pow(1 - t, 3);
};


/**
 * 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;
};