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/*
* This file is part of OneConfig.
* OneConfig - Next Generation Config Library for Minecraft: Java Edition
* Copyright (C) 2021, 2022 Polyfrost.
* <https://polyfrost.cc> <https://github.com/Polyfrost/>
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* OneConfig is licensed under the terms of version 3 of the GNU Lesser
* General Public License as published by the Free Software Foundation, AND
* under the Additional Terms Applicable to OneConfig, as published by Polyfrost,
* either version 1.0 of the Additional Terms, 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License. If not, see <https://www.gnu.org/licenses/>. You should
* have also received a copy of the Additional Terms Applicable
* to OneConfig, as published by Polyfrost. If not, see
* <https://polyfrost.cc/legal/oneconfig/additional-terms>
*/
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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