1 /* 2 * Copyright (C) 2014 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License 15 */ 16 17 package com.android.systemui.statusbar.phone; 18 19 import android.view.animation.Interpolator; 20 21 /** 22 * An implementation of a bouncer interpolator optimized for unlock hinting. 23 */ 24 public class BounceInterpolator implements Interpolator { 25 26 private final static float SCALE_FACTOR = 7.5625f; 27 28 @Override 29 public float getInterpolation(float t) { 30 t *= 11f / 10f; 31 if (t < 4f / 11f) { 32 return SCALE_FACTOR * t * t; 33 } else if (t < 8f / 11f) { 34 float t2 = t - 6f / 11f; 35 return SCALE_FACTOR * t2 * t2 + 3f / 4f; 36 } else if (t < 10f / 11f) { 37 float t2 = t - 9f / 11f; 38 return SCALE_FACTOR * t2 * t2 + 15f / 16f; 39 } else { 40 return 1; 41 } 42 } 43 } 44
