| /* |
| * Copyright (C) 2007 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package android.view.animation; |
| |
| import android.content.Context; |
| import android.util.AttributeSet; |
| |
| import com.android.internal.view.animation.HasNativeInterpolator; |
| import com.android.internal.view.animation.NativeInterpolatorFactory; |
| import com.android.internal.view.animation.NativeInterpolatorFactoryHelper; |
| |
| /** |
| * An interpolator where the rate of change starts and ends slowly but |
| * accelerates through the middle. |
| * |
| */ |
| @HasNativeInterpolator |
| public class AccelerateDecelerateInterpolator implements Interpolator, NativeInterpolatorFactory { |
| public AccelerateDecelerateInterpolator() { |
| } |
| |
| @SuppressWarnings({"UnusedDeclaration"}) |
| public AccelerateDecelerateInterpolator(Context context, AttributeSet attrs) { |
| } |
| |
| public float getInterpolation(float input) { |
| return (float)(Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f; |
| } |
| |
| /** @hide */ |
| @Override |
| public long createNativeInterpolator() { |
| return NativeInterpolatorFactoryHelper.createAccelerateDecelerateInterpolator(); |
| } |
| } |