1 /* 2 * Copyright (C) 2015 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 android.support.car.ui; 17 18 import android.animation.TimeInterpolator; 19 20 /** 21 * Interpolator that can animate any of the quantum curves. 22 * You can also specify 23 * @hide 24 */ 25 public class QuantumInterpolator implements TimeInterpolator { 26 27 /** 28 * Lookup table values. 29 * Generated using a Bezier curve from (0,0) to (1,1) with control points: 30 * P0 (0,0) 31 * P1 (0.4, 0) 32 * P2 (0.2, 1.0) 33 * P3 (1.0, 1.0) 34 * 35 * Values sampled with x at regular intervals between 0 and 1. 36 * 37 * These values were generated using: 38 * ./scripts/bezier_interpolator_values_gen.py 0.4 0.2 39 */ 40 public static final float[] FAST_OUT_SLOW_IN = new float[] { 41 0.0f, 0.0002f, 0.0009f, 0.0019f, 0.0036f, 0.0059f, 0.0086f, 0.0119f, 0.0157f, 0.0209f, 42 0.0257f, 0.0321f, 0.0392f, 0.0469f, 0.0566f, 0.0656f, 0.0768f, 0.0887f, 0.1033f, 0.1186f, 43 0.1349f, 0.1519f, 0.1696f, 0.1928f, 0.2121f, 0.237f, 0.2627f, 0.2892f, 0.3109f, 0.3386f, 44 0.3667f, 0.3952f, 0.4241f, 0.4474f, 0.4766f, 0.5f, 0.5234f, 0.5468f, 0.5701f, 0.5933f, 45 0.6134f, 0.6333f, 0.6531f, 0.6698f, 0.6891f, 0.7054f, 0.7214f, 0.7346f, 0.7502f, 0.763f, 46 0.7756f, 0.7879f, 0.8f, 0.8107f, 0.8212f, 0.8326f, 0.8415f, 0.8503f, 0.8588f, 0.8672f, 47 0.8754f, 0.8833f, 0.8911f, 0.8977f, 0.9041f, 0.9113f, 0.9165f, 0.9232f, 0.9281f, 0.9328f, 48 0.9382f, 0.9434f, 0.9476f, 0.9518f, 0.9557f, 0.9596f, 0.9632f, 0.9662f, 0.9695f, 0.9722f, 49 0.9753f, 0.9777f, 0.9805f, 0.9826f, 0.9847f, 0.9866f, 0.9884f, 0.9901f, 0.9917f, 0.9931f, 50 0.9944f, 0.9955f, 0.9964f, 0.9973f, 0.9981f, 0.9986f, 0.9992f, 0.9995f, 0.9998f, 1.0f, 1.0f 51 }; 52 53 /** 54 * These values were generated using: 55 * ./scripts/bezier_interpolator_values_gen.py 0.0 0.2 56 */ 57 public static final float[] LINEAR_OUT_SLOW_IN = new float[] { 58 0.0029f, 0.043f, 0.0785f, 0.1147f, 0.1476f, 0.1742f, 0.2024f, 0.2319f, 0.2575f, 0.2786f, 59 0.3055f, 0.3274f, 0.3498f, 0.3695f, 0.3895f, 0.4096f, 0.4299f, 0.4474f, 0.4649f, 60 0.4824f, 0.5f, 0.5176f, 0.5322f, 0.5468f, 0.5643f, 0.5788f, 0.5918f, 0.6048f, 0.6191f, 61 0.6333f, 0.6446f, 0.6573f, 0.6698f, 0.6808f, 0.6918f, 0.704f, 0.7148f, 0.7254f, 0.7346f, 62 0.7451f, 0.7554f, 0.7655f, 0.7731f, 0.783f, 0.7916f, 0.8f, 0.8084f, 0.8166f, 0.8235f, 63 0.8315f, 0.8393f, 0.8459f, 0.8535f, 0.8599f, 0.8672f, 0.8733f, 0.8794f, 0.8853f, 64 0.8911f, 0.8967f, 0.9023f, 0.9077f, 0.9121f, 0.9173f, 0.9224f, 0.9265f, 0.9313f, 65 0.9352f, 0.9397f, 0.9434f, 0.9476f, 0.9511f, 0.9544f, 0.9577f, 0.9614f, 0.9644f, 66 0.9673f, 0.9701f, 0.9727f, 0.9753f, 0.9777f, 0.98f, 0.9818f, 0.9839f, 0.9859f, 0.9877f, 67 0.9891f, 0.9907f, 0.9922f, 0.9933f, 0.9946f, 0.9957f, 0.9966f, 0.9974f, 0.9981f, 68 0.9986f, 0.9992f, 0.9995f, 0.9998f, 1.0f, 1.0f 69 }; 70 71 /** 72 * These values were generated using: 73 * ./scripts/bezier_interpolator_values_gen.py 0.0 0.2 74 */ 75 public static final float[] FAST_OUT_LINEAR_IN = new float[] { 76 0.0f, 0.0002f, 0.0008f, 0.0019f, 0.0032f, 0.0049f, 0.0069f, 0.0093f, 0.0119f, 0.0149f, 77 0.0182f, 0.0218f, 0.0257f, 0.0299f, 0.0344f, 0.0392f, 0.0443f, 0.0496f, 0.0552f, 78 0.0603f, 0.0656f, 0.0719f, 0.0785f, 0.0853f, 0.0923f, 0.0986f, 0.1051f, 0.1128f, 79 0.1206f, 0.1287f, 0.1359f, 0.1433f, 0.1519f, 0.1607f, 0.1696f, 0.1776f, 0.1857f, 80 0.1952f, 0.2048f, 0.2145f, 0.2232f, 0.2319f, 0.2421f, 0.2523f, 0.2627f, 0.2733f, 81 0.2826f, 0.2919f, 0.3027f, 0.3137f, 0.3247f, 0.3358f, 0.3469f, 0.3582f, 0.3695f, 82 0.3809f, 0.3924f, 0.4039f, 0.4154f, 0.427f, 0.4386f, 0.4503f, 0.4619f, 0.4751f, 0.4883f, 83 0.5f, 0.5117f, 0.5264f, 0.5381f, 0.5497f, 0.5643f, 0.5759f, 0.5904f, 0.6033f, 0.6162f, 84 0.6305f, 0.6446f, 0.6587f, 0.6698f, 0.6836f, 0.7f, 0.7134f, 0.7267f, 0.7425f, 0.7554f, 85 0.7706f, 0.7855f, 0.8f, 0.8143f, 0.8281f, 0.8438f, 0.8588f, 0.8733f, 0.8892f, 0.9041f, 86 0.9215f, 0.9344f, 0.9518f, 0.9667f, 0.9826f, 0.9993f 87 88 }; 89 90 private final float[] mValues; 91 private final float mStepSize; 92 private final float mStartTime; 93 private final float mEndTime; 94 95 public QuantumInterpolator(float[] values, float pre, float during, float post) { 96 super(); 97 mValues = values; 98 mStepSize = 1.0f / (mValues.length - 1); 99 mStartTime = pre / (pre + during + post); 100 mEndTime = mStartTime + (during / (pre + during + post)); 101 } 102 103 @Override 104 public float getInterpolation(float input) { 105 return getInterpolation(input, mStartTime, mEndTime); 106 } 107 108 public float getReverseInterpolation(float input) { 109 return getInterpolation(input, 1 - mEndTime, 1 - mStartTime); 110 } 111 112 public float getInterpolation(float input, float startTime, float endTime) { 113 if (input <= startTime) { 114 return 0.0f; 115 } else if (input >= endTime) { 116 return 1.0f; 117 } 118 119 input = (input - startTime) / (endTime - startTime); 120 121 int position = Math.min( 122 (int)(input * (mValues.length - 1)), 123 mValues.length - 2); 124 125 float quantized = position * mStepSize; 126 float difference = input - quantized; 127 float weight = difference / mStepSize; 128 129 return mValues[position] + weight * (mValues[position + 1] - mValues[position]); 130 } 131 } 132
