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package com.diozero.animation.easing;
/*-
* #%L
* Organisation: diozero
* Project: diozero - Core
* Filename: Back.java
*
* This file is part of the diozero project. More information about this project
* can be found at https://www.diozero.com/.
* %%
* Copyright (C) 2016 - 2021 diozero
* %%
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
* #L%
*/
public class Back {
private static final float DEFAULT_SPEED = 1.70158f;
public static final String IN = "inBack";
public static float easeIn(float t, float b, float c, float d) {
return easeIn(t, b, c, d, DEFAULT_SPEED);
}
public static float easeIn(float t, float b, float c, float d, float s) {
return c * (t /= d) * t * ((s + 1) * t - s) + b;
}
public static final String OUT = "outBack";
public static float easeOut(float t, float b, float c, float d) {
return easeOut(t, b, c, d, DEFAULT_SPEED);
}
public static float easeOut(float t, float b, float c, float d, float s) {
return c * ((t = t / d - 1) * t * ((s + 1) * t + s) + 1) + b;
}
public static final String IN_OUT = "inOutBack";
public static float easeInOut(float t, float b, float c, float d) {
return easeInOut(t, b, c, d, DEFAULT_SPEED);
}
public static float easeInOut(float t, float b, float c, float d, float s) {
if ((t /= d / 2) < 1) {
return c / 2 * (t * t * (((s *= (1.525f)) + 1) * t - s)) + b;
}
return c / 2 * ((t -= 2) * t * (((s *= (1.525f)) + 1) * t + s) + 2) + b;
}
}
