jquery-easing.js

jQuery.extend(jQuery.easing, {
    linear: function (t) { return t },
    // accelerating from zero velocity
    easeInQuad: function (t) { return t*t },
    // decelerating to zero velocity
    easeOutQuad: function (t) { return t*(2-t) },
    // acceleration until halfway, then deceleration
    easeInOutQuad: function (t) { return t<.5 ? 2*t*t : -1+(4-2*t)*t },
    // accelerating from zero velocity
    easeInCubic: function (t) { return t*t*t },
    // decelerating to zero velocity
    easeOutCubic: function (t) { return (--t)*t*t+1 },
    // acceleration until halfway, then deceleration
    easeInOutCubic: function (t) { return t<.5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1 },
    // accelerating from zero velocity
    easeInQuart: function (t) { return t*t*t*t },
    // decelerating to zero velocity
    easeOutQuart: function (t) { return 1-(--t)*t*t*t },
    // acceleration until halfway, then deceleration
    easeInOutQuart: function (t) { return t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t },
    // accelerating from zero velocity
    easeInQuint: function (t) { return t*t*t*t*t },
    // decelerating to zero velocity
    easeOutQuint: function (t) { return 1+(--t)*t*t*t*t },
    // acceleration until halfway, then deceleration
    easeInOutQuint: function (t) { return t<.5 ? 16*t*t*t*t*t : 1+16*(--t)*t*t*t*t },
    // bounce-in
    easeInBounce: function (x, t, b, c, d) {
        return c - $.easing.easeOutBounce (x, d-t, 0, c, d) + b;
    },
    // bounce-out
    easeOutBounce: function (x, 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;
        }
    },
    customEase1: function (x, t, b, c, d) {
        return c*(t/=d)*t + b;
    },
    customEase2: function (x, t, b, c, d) {
        if ((t/=d/2) < 1) return c/2*t*t + b;
        return -c/2 * ((--t)*(t-2) -1) + b;
    }
});