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.content.res.TypedArray; 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectimport android.util.AttributeSet; 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * An interpolator where the rate of change starts out quickly and 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * and then decelerates. 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class DecelerateInterpolator implements Interpolator { 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DecelerateInterpolator() { 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 3152964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Constructor 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 3552964243dc95f74ac2ab9a96d031a36931a11931Gilles Debunne * @param factor Degree to which the animation should be eased. Setting factor to 1.0f produces 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * an upside-down y=x^2 parabola. Increasing factor above 1.0f makes exaggerates the 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * ease-out effect (i.e., it starts even faster and ends evens slower) 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DecelerateInterpolator(float factor) { 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFactor = factor; 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public DecelerateInterpolator(Context context, AttributeSet attrs) { 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project TypedArray a = 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project context.obtainStyledAttributes(attrs, com.android.internal.R.styleable.DecelerateInterpolator); 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project mFactor = a.getFloat(com.android.internal.R.styleable.DecelerateInterpolator_factor, 1.0f); 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project a.recycle(); 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public float getInterpolation(float input) { 536908cd154c5a2ed2e3b21d40f51952d45be69184Dianne Hackborn float result; 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (mFactor == 1.0f) { 556908cd154c5a2ed2e3b21d40f51952d45be69184Dianne Hackborn result = (float)(1.0f - (1.0f - input) * (1.0f - input)); 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } else { 576908cd154c5a2ed2e3b21d40f51952d45be69184Dianne Hackborn result = (float)(1.0f - Math.pow((1.0f - input), 2 * mFactor)); 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 596908cd154c5a2ed2e3b21d40f51952d45be69184Dianne Hackborn return result; 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project private float mFactor = 1.0f; 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 64