1 /*
2  * Copyright (C) 2016 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.dialer.common;
18 
19 /** Utility class for common math operations */
20 public class MathUtil {
21 
22   /**
23    * Interpolates between two integer values based on percentage.
24    *
25    * @param begin Begin value
26    * @param end End value
27    * @param percent Percentage value, between 0 and 1
28    * @return Interpolated result
29    */
lerp(int begin, int end, float percent)30   public static int lerp(int begin, int end, float percent) {
31     return (int) (begin * (1 - percent) + end * percent);
32   }
33 
34   /**
35    * Interpolates between two float values based on percentage.
36    *
37    * @param begin Begin value
38    * @param end End value
39    * @param percent Percentage value, between 0 and 1
40    * @return Interpolated result
41    */
lerp(float begin, float end, float percent)42   public static float lerp(float begin, float end, float percent) {
43     return begin * (1 - percent) + end * percent;
44   }
45 
46   /**
47    * Clamps a value between two bounds inclusively.
48    *
49    * @param value Value to be clamped
50    * @param min Lower bound
51    * @param max Upper bound
52    * @return Clamped value
53    */
clamp(float value, float min, float max)54   public static float clamp(float value, float min, float max) {
55     return Math.max(min, Math.min(value, max));
56   }
57 }
58