content: /*
   * 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 extends BaseInterpolator
          implements 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();
      }
  }
  