/**
* Wire
* Copyright (C) 2016 Wire Swiss GmbH
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* This part of the Wire sofware is based on the work of Robert Penner.
* (http://robertpenner.com/easing)
*
* Copyright (C) 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.
*/
package com.waz.zclient.ui.animation.interpolators.penner;
import android.view.animation.Interpolator;
public final class Back {
private Back() {}
private static final float DEFAULT_OVERSHOOT_AMOUNT = 1.70158f;
public static class EaseIn implements Interpolator {
private final float overshoot;
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing in: accelerating from zero velocity.
*/
public EaseIn() {
this(DEFAULT_OVERSHOOT_AMOUNT);
}
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing in: accelerating from zero velocity.
*
* @param overshoot Overshoot ammount: higher overshoot means greater overshoot
* (0 produces cubic easing with no overshoot,
* and the default value of 1.70158 produces an overshoot of 10 percent).
*/
public EaseIn(float overshoot) {
this.overshoot = overshoot;
}
@Override
public float getInterpolation(float t) {
return t * t * ((overshoot + 1) * t - overshoot);
}
}
public static class EaseOut implements Interpolator {
private final float overshoot;
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing out: decelerating from zero velocity.
*/
public EaseOut() {
this(DEFAULT_OVERSHOOT_AMOUNT);
}
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing out: decelerating from zero velocity.
*
* @param overshoot Overshoot ammount: higher overshoot means greater overshoot
* (0 produces cubic easing with no overshoot,
* and the default value of 1.70158 produces an overshoot of 10 percent).
*/
public EaseOut(float overshoot) {
this.overshoot = overshoot;
}
@Override
public float getInterpolation(float t) {
return (t = t - 1) * t * ((overshoot + 1) * t + overshoot) + 1;
}
}
public static class EaseInOut implements Interpolator {
private final float overshoot;
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing in/out: acceleration until halfway, then deceleration.
*/
public EaseInOut() {
this(DEFAULT_OVERSHOOT_AMOUNT);
}
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing in/out: acceleration until halfway, then deceleration.
*
* @param overshoot Overshoot ammount: higher overshoot means greater overshoot
* (0 produces cubic easing with no overshoot,
* and the default value of 1.70158 produces an overshoot of 10 percent).
*/
public EaseInOut(float overshoot) {
this.overshoot = overshoot;
}
@Override
public float getInterpolation(float t) {
if ((t /= 2f) < 1) {
return .5f * (t * t * ((overshoot * 1.525f + 1) * t - (overshoot * 1.525f)));
} else {
return .5f * ((t -= 2) * t * ((overshoot * 1.525f + 1) * t + overshoot * 1.525f) + 2);
}
}
}
public static class EaseOutIn implements Interpolator {
private final float overshoot;
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing out/in: deceleration until halfway, then acceleration.
*/
public EaseOutIn() {
this(DEFAULT_OVERSHOOT_AMOUNT);
}
/**
* Easing equation function for a back (overshooting cubic easing: (overshoot+1)*t^3 - overshoot*t^2)
* easing out/in: deceleration until halfway, then acceleration.
*
* @param overshoot Overshoot ammount: higher overshoot means greater overshoot
* (0 produces cubic easing with no overshoot,
* and the default value of 1.70158 produces an overshoot of 10 percent).
*/
public EaseOutIn(float overshoot) {
this.overshoot = overshoot;
}
@Override
public float getInterpolation(float t) {
t = t * 2;
if (t < 1f) {
return .5f * ((t -= 1) * t * ((overshoot + 1) * t + overshoot) + 1);
} else {
return .5f * t * t * ((overshoot + 1) * t - overshoot) + .5f;
}
}
}
}