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/* This file contains an adaptation of code from The Android Open Source
* Project found at <https://cs.android.com/>
* For the avoidance of doubt, this file is still licensed under the terms
* of OneConfig's Licensing.
*
* LICENSE NOTICE FOR ADAPTED CODE
*
* Copyright 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use the file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Significant changes (as required by the Apache 2.0):
* - Changed variable names
* - Code adapted from Kotlin to Java
* - Removed variables defining premade easing functions
* - Added constructor for JDT and OneConfig's animation system
*
* As per the terms of the Apache 2.0 License, a copy of the License
* is found at `src/main/resources/licenses/Android-License.txt`.
*/
package cc.polyfrost.oneconfig.gui.animations;
public class CubicBezier extends Animation {
private static final float CubicErrorBound = 0.001f;
protected final float P0;
protected final float P1;
protected final float P2;
protected final float P3;
/**
* @param P0 First control point X
* @param P1 First control point Y
* @param P2 Second control point X
* @param P3 Second control point Y
* @param duration The duration of the animation
* @param start The start of the animation
* @param end The end of the animation
* @param reverse Reverse the animation
*/
public CubicBezier(float P0, float P1, float P2, float P3, float duration, float start, float end, boolean reverse) {
super(duration, start, end, reverse);
this.P0 = P0;
this.P1 = P1;
this.P2 = P2;
this.P3 = P3;
}
/**
* This constructor should be used with JDT's getCubicBezier method
*
* @param points The control points
* @param duration The duration of the animation
* @param start The start of the animation
* @param end The end of the animation
* @param reverse Reverse the animation
*/
public CubicBezier(float[] points, float duration, float start, float end, boolean reverse) {
this(points[0], points[1], points[2], points[3], duration, start, end, reverse);
}
/**
* Adapted from <a href="https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/animation/animation-core/src/commonMain/kotlin/androidx/compose/animation/core/Easing.kt">Android</a>
* Under Apache 2.0 license
*
* @param x The current point
* @return The value
*/
@Override
protected float animate(float x) {
float start = 0.0f;
float end = 1.0f;
while (true) {
float midpoint = (start + end) / 2;
float estimate = evaluateCubic(P0, P2, midpoint);
if (Math.abs(x - estimate) < CubicErrorBound)
return evaluateCubic(P1, P3, midpoint);
if (estimate < x) start = midpoint;
else end = midpoint;
}
}
/**
* Adapted from <a href="https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:compose/animation/animation-core/src/commonMain/kotlin/androidx/compose/animation/core/Easing.kt">Android</a>
* Under Apache 2.0 license
*/
private float evaluateCubic(float a, float b, float m) {
return 3 * a * (1 - m) * (1 - m) * m +
3 * b * (1 - m) * /* */ m * m +
/* */ m * m * m;
}
}
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