AccelerateDecelerateInterpolator.java revision 315c329544d7c593d1072b071cbb92d9afe74021
19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage android.view.animation; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.content.Context; 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 22315c329544d7c593d1072b071cbb92d9afe74021John Reckimport com.android.internal.view.animation.HasNativeInterpolator; 23315c329544d7c593d1072b071cbb92d9afe74021John Reckimport com.android.internal.view.animation.NativeInterpolatorFactory; 24315c329544d7c593d1072b071cbb92d9afe74021John Reckimport com.android.internal.view.animation.NativeInterpolatorFactoryHelper; 25315c329544d7c593d1072b071cbb92d9afe74021John Reck 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * An interpolator where the rate of change starts and ends slowly but 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * accelerates through the middle. 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 31315c329544d7c593d1072b071cbb92d9afe74021John Reck@HasNativeInterpolator 32315c329544d7c593d1072b071cbb92d9afe74021John Reckpublic class AccelerateDecelerateInterpolator implements Interpolator, NativeInterpolatorFactory { 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AccelerateDecelerateInterpolator() { 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 368b0662878eae69ab62e859b07165f086ea65cad5Jean-Baptiste Queru @SuppressWarnings({"UnusedDeclaration"}) 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public AccelerateDecelerateInterpolator(Context context, AttributeSet attrs) { 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float getInterpolation(float input) { 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (float)(Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f; 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 43315c329544d7c593d1072b071cbb92d9afe74021John Reck 44315c329544d7c593d1072b071cbb92d9afe74021John Reck /** @hide */ 45315c329544d7c593d1072b071cbb92d9afe74021John Reck @Override 46315c329544d7c593d1072b071cbb92d9afe74021John Reck public long createNativeInterpolator() { 47315c329544d7c593d1072b071cbb92d9afe74021John Reck return NativeInterpolatorFactoryHelper.createAccelerateDecelerateInterpolator(); 48315c329544d7c593d1072b071cbb92d9afe74021John Reck } 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 50