EasingFunction.js

define([
        '../ThirdParty/Tween',
        './freezeObject'
    ], function(
        Tween,
        freezeObject) {
    'use strict';

    /**
     * Easing functions for use with {@link TweenCollection}.  These function are from
     * {@link https://github.com/sole/tween.js/|Tween.js} and Robert Penner.  See the
     * {@link http://sole.github.io/tween.js/examples/03_graphs.html|Tween.js graphs for each function}.
     *
     * @exports EasingFunction
     */
    var EasingFunction = {
        /**
         * Linear easing.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        LINEAR_NONE : Tween.Easing.Linear.None,

        /**
         * Quadratic in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUADRACTIC_IN : Tween.Easing.Quadratic.In,
        /**
         * Quadratic out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUADRACTIC_OUT : Tween.Easing.Quadratic.Out,
        /**
         * Quadratic in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUADRACTIC_IN_OUT : Tween.Easing.Quadratic.InOut,

        /**
         * Cubic in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CUBIC_IN : Tween.Easing.Cubic.In,
        /**
         * Cubic out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CUBIC_OUT : Tween.Easing.Cubic.Out,
        /**
         * Cubic in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CUBIC_IN_OUT : Tween.Easing.Cubic.InOut,

        /**
         * Quartic in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUARTIC_IN : Tween.Easing.Quartic.In,
        /**
         * Quartic out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUARTIC_OUT : Tween.Easing.Quartic.Out,
        /**
         * Quartic in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUARTIC_IN_OUT : Tween.Easing.Quartic.InOut,

        /**
         * Quintic in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUINTIC_IN : Tween.Easing.Quintic.In,
        /**
         * Quintic out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUINTIC_OUT : Tween.Easing.Quintic.Out,
        /**
         * Quintic in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        QUINTIC_IN_OUT : Tween.Easing.Quintic.InOut,

        /**
         * Sinusoidal in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        SINUSOIDAL_IN : Tween.Easing.Sinusoidal.In,
        /**
         * Sinusoidal out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        SINUSOIDAL_OUT : Tween.Easing.Sinusoidal.Out,
        /**
         * Sinusoidal in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        SINUSOIDAL_IN_OUT : Tween.Easing.Sinusoidal.InOut,

        /**
         * Exponential in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        EXPONENTIAL_IN : Tween.Easing.Exponential.In,
        /**
         * Exponential out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        EXPONENTIAL_OUT : Tween.Easing.Exponential.Out,
        /**
         * Exponential in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        EXPONENTIAL_IN_OUT : Tween.Easing.Exponential.InOut,

        /**
         * Circular in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CIRCULAR_IN : Tween.Easing.Circular.In,
        /**
         * Circular out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CIRCULAR_OUT : Tween.Easing.Circular.Out,
        /**
         * Circular in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        CIRCULAR_IN_OUT : Tween.Easing.Circular.InOut,

        /**
         * Elastic in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        ELASTIC_IN : Tween.Easing.Elastic.In,
        /**
         * Elastic out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        ELASTIC_OUT : Tween.Easing.Elastic.Out,
        /**
         * Elastic in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        ELASTIC_IN_OUT : Tween.Easing.Elastic.InOut,

        /**
         * Back in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BACK_IN : Tween.Easing.Back.In,
        /**
         * Back out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BACK_OUT : Tween.Easing.Back.Out,
        /**
         * Back in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BACK_IN_OUT : Tween.Easing.Back.InOut,

        /**
         * Bounce in.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BOUNCE_IN : Tween.Easing.Bounce.In,
        /**
         * Bounce out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BOUNCE_OUT : Tween.Easing.Bounce.Out,
        /**
         * Bounce in then out.
         *
         * @type {EasingFunction~Callback}
         * @constant
         */
        BOUNCE_IN_OUT : Tween.Easing.Bounce.InOut
    };

    /**
     * Function interface for implementing a custom easing function.
     * @callback EasingFunction~Callback
     * @param {Number} time The time in the range <code>[0, 1]</code>.
     * @returns {Number} The value of the function at the given time.
     *
     * @example
     * function quadraticIn(time) {
     *     return time * time;
     * }
     *
     * @example
     * function quadraticOut(time) {
     *     return time * (2.0 - time);
     * }
     */

    return freezeObject(EasingFunction);
});