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Viewing file:     equations.js (25.79 KB)      -rw-r--r--

/* -*- mode: C; c-basic-offset: 4; indent-tabs-mode: nil; -*- */
/* Copyright 2008 litl, LLC. All Rights Reserved. */
/**
 * Equations
 * Main equations for the Tweener class
 *
 * @author              Zeh Fernando, Nate Chatellier
 * @version             1.0.2
 */

/*
 Disclaimer for Robert Penner's Easing Equations license:

 TERMS OF USE - EASING EQUATIONS

 Open source under the BSD License.

 Copyright © 2001 Robert Penner
 All rights reserved.

 Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
 * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
 * Neither the name of the author nor the names of contributors may be used to endorse or promote products derived from this software without specific prior written permission.

 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
//log("Loading equations.js");

// ==================================================================================================================================
// TWEENING EQUATIONS functions -----------------------------------------------------------------------------------------------------
// (the original equations are Robert Penner's work as mentioned on the disclaimer)

/**
 * Easing equation function for a simple linear tweening, with no easing.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeNone (t, b, c, d, p_params) {
    return c*t/d + b;
}

/* Useful alias */
function linear (t, b, c ,d, p_params) {
    return easeNone (t, b, c, d, p_params);
}

/**
 * Easing equation function for a quadratic (t^2) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInQuad (t, b, c, d, p_params) {
    return c*(t/=d)*t + b;
}

/**
 * Easing equation function for a quadratic (t^2) easing out: decelerating to zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutQuad (t, b, c, d, p_params) {
    return -c *(t/=d)*(t-2) + b;
}

/**
 * Easing equation function for a quadratic (t^2) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutQuad (t, b, c, d, p_params) {
    if ((t/=d/2) < 1) return c/2*t*t + b;
    return -c/2 * ((--t)*(t-2) - 1) + b;
}

/**
 * Easing equation function for a quadratic (t^2) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInQuad (t, b, c, d, p_params) {
    if (t < d/2) return easeOutQuad (t*2, b, c/2, d, p_params);
    return easeInQuad((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a cubic (t^3) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInCubic (t, b, c, d, p_params) {
    return c*(t/=d)*t*t + b;
}

/**
 * Easing equation function for a cubic (t^3) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutCubic (t, b, c, d, p_params) {
    return c*((t=t/d-1)*t*t + 1) + b;
}

/**
 * Easing equation function for a cubic (t^3) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutCubic (t, b, c, d, p_params) {
    if ((t/=d/2) < 1) return c/2*t*t*t + b;
    return c/2*((t-=2)*t*t + 2) + b;
}

/**
 * Easing equation function for a cubic (t^3) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInCubic (t, b, c, d, p_params) {
    if (t < d/2) return easeOutCubic (t*2, b, c/2, d, p_params);
    return easeInCubic((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a quartic (t^4) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInQuart (t, b, c, d, p_params) {
    return c*(t/=d)*t*t*t + b;
}

/**
 * Easing equation function for a quartic (t^4) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutQuart (t, b, c, d, p_params) {
    return -c * ((t=t/d-1)*t*t*t - 1) + b;
}

/**
 * Easing equation function for a quartic (t^4) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutQuart (t, b, c, d, p_params) {
    if ((t/=d/2) < 1) return c/2*t*t*t*t + b;
    return -c/2 * ((t-=2)*t*t*t - 2) + b;
}

/**
 * Easing equation function for a quartic (t^4) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInQuart (t, b, c, d, p_params) {
    if (t < d/2) return easeOutQuart (t*2, b, c/2, d, p_params);
    return easeInQuart((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a quintic (t^5) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInQuint (t, b, c, d, p_params) {
    return c*(t/=d)*t*t*t*t + b;
}

/**
 * Easing equation function for a quintic (t^5) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutQuint (t, b, c, d, p_params) {
    return c*((t=t/d-1)*t*t*t*t + 1) + b;
}

/**
 * Easing equation function for a quintic (t^5) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutQuint (t, b, c, d, p_params) {
    if ((t/=d/2) < 1) return c/2*t*t*t*t*t + b;
    return c/2*((t-=2)*t*t*t*t + 2) + b;
}

/**
 * Easing equation function for a quintic (t^5) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInQuint (t, b, c, d, p_params) {
    if (t < d/2) return easeOutQuint (t*2, b, c/2, d, p_params);
    return easeInQuint((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a sinusoidal (sin(t)) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInSine (t, b, c, d, p_params) {
    return -c * Math.cos(t/d * (Math.PI/2)) + c + b;
}

/**
 * Easing equation function for a sinusoidal (sin(t)) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutSine (t, b, c, d, p_params) {
    return c * Math.sin(t/d * (Math.PI/2)) + b;
}

/**
 * Easing equation function for a sinusoidal (sin(t)) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutSine (t, b, c, d, p_params) {
    return -c/2 * (Math.cos(Math.PI*t/d) - 1) + b;
}

/**
 * Easing equation function for a sinusoidal (sin(t)) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInSine (t, b, c, d, p_params) {
    if (t < d/2) return easeOutSine (t*2, b, c/2, d, p_params);
    return easeInSine((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for an exponential (2^t) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInExpo (t, b, c, d, p_params) {
    return (t<=0) ? b : c * Math.pow(2, 10 * (t/d - 1)) + b;
}

/**
 * Easing equation function for an exponential (2^t) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutExpo (t, b, c, d, p_params) {
    return (t>=d) ? b+c : c * (-Math.pow(2, -10 * t/d) + 1) + b;
}

/**
 * Easing equation function for an exponential (2^t) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutExpo (t, b, c, d, p_params) {
    if (t<=0) return b;
    if (t>=d) return b+c;
    if ((t/=d/2) < 1) return c/2 * Math.pow(2, 10 * (t - 1)) + b;
    return c/2 * (-Math.pow(2, -10 * --t) + 2) + b;
}

/**
 * Easing equation function for an exponential (2^t) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInExpo (t, b, c, d, p_params) {
    if (t < d/2) return easeOutExpo (t*2, b, c/2, d, p_params);
    return easeInExpo((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a circular (sqrt(1-t^2)) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInCirc (t, b, c, d, p_params) {
    return -c * (Math.sqrt(1 - (t/=d)*t) - 1) + b;
}

/**
 * Easing equation function for a circular (sqrt(1-t^2)) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutCirc (t, b, c, d, p_params) {
    return c * Math.sqrt(1 - (t=t/d-1)*t) + b;
}

/**
 * Easing equation function for a circular (sqrt(1-t^2)) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutCirc (t, b, c, d, p_params) {
    if ((t/=d/2) < 1) return -c/2 * (Math.sqrt(1 - t*t) - 1) + b;
    return c/2 * (Math.sqrt(1 - (t-=2)*t) + 1) + b;
}

/**
 * Easing equation function for a circular (sqrt(1-t^2)) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInCirc (t, b, c, d, p_params) {
    if (t < d/2) return easeOutCirc (t*2, b, c/2, d, p_params);
    return easeInCirc((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for an elastic (exponentially decaying sine wave) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param a             Amplitude.
 * @param p             Period.
 * @return              The correct value.
 */
function easeInElastic (t, b, c, d, p_params) {
    if (t<=0) return b;
    if ((t/=d)>=1) return b+c;
    var p = !Boolean(p_params) || isNaN(p_params.period) ? d*.3 : p_params.period;
    var s;
    var a = !Boolean(p_params) || isNaN(p_params.amplitude) ? 0 : p_params.amplitude;
    if (!Boolean(a) || a < Math.abs(c)) {
        a = c;
        s = p/4;
    } else {
        s = p/(2*Math.PI) * Math.asin (c/a);
    }
    return -(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
}

/**
 * Easing equation function for an elastic (exponentially decaying sine wave) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param a             Amplitude.
 * @param p             Period.
 * @return              The correct value.
 */
function easeOutElastic (t, b, c, d, p_params) {
    if (t<=0) return b;
    if ((t/=d)>=1) return b+c;
    var p = !Boolean(p_params) || isNaN(p_params.period) ? d*.3 : p_params.period;
    var s;
    var a = !Boolean(p_params) || isNaN(p_params.amplitude) ? 0 : p_params.amplitude;
    if (!Boolean(a) || a < Math.abs(c)) {
        a = c;
        s = p/4;
    } else {
        s = p/(2*Math.PI) * Math.asin (c/a);
    }
    return (a*Math.pow(2,-10*t) * Math.sin( (t*d-s)*(2*Math.PI)/p ) + c + b);
}

/**
 * Easing equation function for an elastic (exponentially decaying sine wave) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param a             Amplitude.
 * @param p             Period.
 * @return              The correct value.
 */
function easeInOutElastic (t, b, c, d, p_params) {
    if (t<=0) return b;
    if ((t/=d/2)>=2) return b+c;
    var p = !Boolean(p_params) || isNaN(p_params.period) ? d*(.3*1.5) : p_params.period;
    var s;
    var a = !Boolean(p_params) || isNaN(p_params.amplitude) ? 0 : p_params.amplitude;
    if (!Boolean(a) || a < Math.abs(c)) {
        a = c;
        s = p/4;
    } else {
        s = p/(2*Math.PI) * Math.asin (c/a);
    }
    if (t < 1) return -.5*(a*Math.pow(2,10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )) + b;
    return a*Math.pow(2,-10*(t-=1)) * Math.sin( (t*d-s)*(2*Math.PI)/p )*.5 + c + b;
}

/**
 * Easing equation function for an elastic (exponentially decaying sine wave) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param a             Amplitude.
 * @param p             Period.
 * @return              The correct value.
 */
function easeOutInElastic (t, b, c, d, p_params) {
    if (t < d/2) return easeOutElastic (t*2, b, c/2, d, p_params);
    return easeInElastic((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param s             Overshoot ammount: higher s means greater overshoot (0 produces cubic easing with no overshoot, and the default value of 1.70158 produces an overshoot of 10 percent).
 * @return              The correct value.
 */
function easeInBack (t, b, c, d, p_params) {
    var s = !Boolean(p_params) || isNaN(p_params.overshoot) ? 1.70158 : p_params.overshoot;
    return c*(t/=d)*t*((s+1)*t - s) + b;
}

/**
 * Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param s             Overshoot ammount: higher s means greater overshoot (0 produces cubic easing with no overshoot, and the default value of 1.70158 produces an overshoot of 10 percent).
 * @return              The correct value.
 */
function easeOutBack (t, b, c, d, p_params) {
    var s = !Boolean(p_params) || isNaN(p_params.overshoot) ? 1.70158 : p_params.overshoot;
    return c*((t=t/d-1)*t*((s+1)*t + s) + 1) + b;
}

/**
 * Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param s             Overshoot ammount: higher s means greater overshoot (0 produces cubic easing with no overshoot, and the default value of 1.70158 produces an overshoot of 10 percent).
 * @return              The correct value.
 */
function easeInOutBack (t, b, c, d, p_params) {
    var s = !Boolean(p_params) || isNaN(p_params.overshoot) ? 1.70158 : p_params.overshoot;
    if ((t/=d/2) < 1) return c/2*(t*t*(((s*=(1.525))+1)*t - s)) + b;
    return c/2*((t-=2)*t*(((s*=(1.525))+1)*t + s) + 2) + b;
}

/**
 * Easing equation function for a back (overshooting cubic easing: (s+1)*t^3 - s*t^2) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @param s             Overshoot ammount: higher s means greater overshoot (0 produces cubic easing with no overshoot, and the default value of 1.70158 produces an overshoot of 10 percent).
 * @return              The correct value.
 */
function easeOutInBack (t, b, c, d, p_params) {
    if (t < d/2) return easeOutBack (t*2, b, c/2, d, p_params);
    return easeInBack((t*2)-d, b+c/2, c/2, d, p_params);
}

/**
 * Easing equation function for a bounce (exponentially decaying parabolic bounce) easing in: accelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInBounce (t, b, c, d, p_params) {
    return c - easeOutBounce (d-t, 0, c, d) + b;
}

/**
 * Easing equation function for a bounce (exponentially decaying parabolic bounce) easing out: decelerating from zero velocity.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutBounce (t, b, c, d, p_params) {
    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;
    }
}

/**
 * Easing equation function for a bounce (exponentially decaying parabolic bounce) easing in/out: acceleration until halfway, then deceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeInOutBounce (t, b, c, d, p_params) {
    if (t < d/2) return easeInBounce (t*2, 0, c, d) * .5 + b;
    else return easeOutBounce (t*2-d, 0, c, d) * .5 + c*.5 + b;
}

/**
 * Easing equation function for a bounce (exponentially decaying parabolic bounce) easing out/in: deceleration until halfway, then acceleration.
 *
 * @param t             Current time (in frames or seconds).
 * @param b             Starting value.
 * @param c             Change needed in value.
 * @param d             Expected easing duration (in frames or seconds).
 * @return              The correct value.
 */
function easeOutInBounce (t, b, c, d, p_params) {
    if (t < d/2) return easeOutBounce (t*2, b, c/2, d, p_params);
    return easeInBounce((t*2)-d, b+c/2, c/2, d, p_params);
}

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