/*
 * jQuery Easing v1.4.1 - http://gsgd.co.uk/sandbox/jquery/easing/
 * Open source under the BSD License.
 * Copyright © 2008 George McGinley Smith
 * All rights reserved.
 * https://raw.github.com/gdsmith/jquery-easing/master/LICENSE
*/

(function (factory) {
    if (typeof define === "function" && define.amd) {
        define(['jquery'], function ($) {
            return factory($);
        });
    } else if (typeof module === "object" && typeof module.exports === "object") {
        exports = factory(require('jquery'));
    } else {
        factory(jQuery);
    }
})(function ($) {

    // Preserve the original jQuery "swing" easing as "jswing"
    $.easing.jswing = $.easing.swing;

    var pow = Math.pow,
        sqrt = Math.sqrt,
        sin = Math.sin,
        cos = Math.cos,
        PI = Math.PI,
        c1 = 1.70158,
        c2 = c1 * 1.525,
        c3 = c1 + 1,
        c4 = (2 * PI) / 3,
        c5 = (2 * PI) / 4.5;

    // x is the fraction of animation progress, in the range 0..1
    function bounceOut(x) {
        var n1 = 7.5625,
            d1 = 2.75;
        if (x < 1 / d1) {
            return n1 * x * x;
        } else if (x < 2 / d1) {
            return n1 * (x -= (1.5 / d1)) * x + 0.75;
        } else if (x < 2.5 / d1) {
            return n1 * (x -= (2.25 / d1)) * x + 0.9375;
        } else {
            return n1 * (x -= (2.625 / d1)) * x + 0.984375;
        }
    }

    $.extend($.easing,
        {
            def: 'easeOutQuad',
            swing: function (x) {
                return $.easing[$.easing.def](x);
            },
            easeInQuad: function (x) {
                return x * x;
            },
            easeOutQuad: function (x) {
                return 1 - (1 - x) * (1 - x);
            },
            easeInOutQuad: function (x) {
                return x < 0.5 ?
                    2 * x * x :
                    1 - pow(-2 * x + 2, 2) / 2;
            },
            easeInCubic: function (x) {
                return x * x * x;
            },
            easeOutCubic: function (x) {
                return 1 - pow(1 - x, 3);
            },
            easeInOutCubic: function (x) {
                return x < 0.5 ?
                    4 * x * x * x :
                    1 - pow(-2 * x + 2, 3) / 2;
            },
            easeInQuart: function (x) {
                return x * x * x * x;
            },
            easeOutQuart: function (x) {
                return 1 - pow(1 - x, 4);
            },
            easeInOutQuart: function (x) {
                return x < 0.5 ?
                    8 * x * x * x * x :
                    1 - pow(-2 * x + 2, 4) / 2;
            },
            easeInQuint: function (x) {
                return x * x * x * x * x;
            },
            easeOutQuint: function (x) {
                return 1 - pow(1 - x, 5);
            },
            easeInOutQuint: function (x) {
                return x < 0.5 ?
                    16 * x * x * x * x * x :
                    1 - pow(-2 * x + 2, 5) / 2;
            },
            easeInSine: function (x) {
                return 1 - cos(x * PI / 2);
            },
            easeOutSine: function (x) {
                return sin(x * PI / 2);
            },
            easeInOutSine: function (x) {
                return -(cos(PI * x) - 1) / 2;
            },
            easeInExpo: function (x) {
                return x === 0 ? 0 : pow(2, 10 * x - 10);
            },
            easeOutExpo: function (x) {
                return x === 1 ? 1 : 1 - pow(2, -10 * x);
            },
            easeInOutExpo: function (x) {
                return x === 0 ? 0 : x === 1 ? 1 : x < 0.5 ?
                    pow(2, 20 * x - 10) / 2 :
                    (2 - pow(2, -20 * x + 10)) / 2;
            },
            easeInCirc: function (x) {
                return 1 - sqrt(1 - pow(x, 2));
            },
            easeOutCirc: function (x) {
                return sqrt(1 - pow(x - 1, 2));
            },
            easeInOutCirc: function (x) {
                return x < 0.5 ?
                    (1 - sqrt(1 - pow(2 * x, 2))) / 2 :
                    (sqrt(1 - pow(-2 * x + 2, 2)) + 1) / 2;
            },
            easeInElastic: function (x) {
                return x === 0 ? 0 : x === 1 ? 1 :
                    -pow(2, 10 * x - 10) * sin((x * 10 - 10.75) * c4);
            },
            easeOutElastic: function (x) {
                return x === 0 ? 0 : x === 1 ? 1 :
                    pow(2, -10 * x) * sin((x * 10 - 0.75) * c4) + 1;
            },
            easeInOutElastic: function (x) {
                return x === 0 ? 0 : x === 1 ? 1 : x < 0.5 ?
                    -(pow(2, 20 * x - 10) * sin((20 * x - 11.125) * c5)) / 2 :
                    pow(2, -20 * x + 10) * sin((20 * x - 11.125) * c5) / 2 + 1;
            },
            easeInBack: function (x) {
                return c3 * x * x * x - c1 * x * x;
            },
            easeOutBack: function (x) {
                return 1 + c3 * pow(x - 1, 3) + c1 * pow(x - 1, 2);
            },
            easeInOutBack: function (x) {
                return x < 0.5 ?
                    (pow(2 * x, 2) * ((c2 + 1) * 2 * x - c2)) / 2 :
                    (pow(2 * x - 2, 2) * ((c2 + 1) * (x * 2 - 2) + c2) + 2) / 2;
            },
            easeInBounce: function (x) {
                return 1 - bounceOut(1 - x);
            },
            easeOutBounce: bounceOut,
            easeInOutBounce: function (x) {
                return x < 0.5 ?
                    (1 - bounceOut(1 - 2 * x)) / 2 :
                    (1 + bounceOut(2 * x - 1)) / 2;
            }
        });

});