1 /* 2 * Copyright (C) 2024 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.internal.widget.remotecompose.core.operations.utilities.easing; 17 18 /** Provide a bouncing Easing function */ 19 public class ElasticOutCurve extends Easing { 20 private static final float F_PI = (float) Math.PI; 21 private static final float C4 = 2 * F_PI / 3; 22 private static final float TWENTY_PI = 20 * F_PI; 23 private static final float LOG_8 = (float) Math.log(8.0f); 24 25 @Override get(float x)26 public float get(float x) { 27 if (x <= 0) { 28 return 0.0f; 29 } 30 if (x >= 1) { 31 return 1.0f; 32 } else return (float) (Math.pow(2.0f, -10 * x) * Math.sin((x * 10 - 0.75f) * C4) + 1); 33 } 34 35 @Override getDiff(float x)36 public float getDiff(float x) { 37 if (x < 0 || x > 1) { 38 return 0.0f; 39 } else 40 return (float) 41 (5 42 * Math.pow(2.0f, 1 - 10 * x) 43 * (LOG_8 * Math.cos(TWENTY_PI * x / 3) 44 + 2 * F_PI * Math.sin(TWENTY_PI * x / 3)) 45 / 3); 46 } 47 } 48