content: /*
   * Copyright (C) 2014 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 com.android.server.policy;
  
  import android.view.animation.Interpolator;
  
  public class LogDecelerateInterpolator implements Interpolator {
  
      private int mBase;
      private int mDrift;
      private final float mLogScale;
  
      public LogDecelerateInterpolator(int base, int drift) {
          mBase = base;
          mDrift = drift;
  
          mLogScale = 1f / computeLog(1, mBase, mDrift);
      }
  
      private static float computeLog(float t, int base, int drift) {
          return (float) -Math.pow(base, -t) + 1 + (drift * t);
      }
  
      @Override
      public float getInterpolation(float t) {
          return computeLog(t, mBase, mDrift) * mLogScale;
      }
  }
  