1 files changed, 57 insertions, 0 deletions
diff --git a/java/com/android/dialer/common/MathUtil.java b/java/com/android/dialer/common/MathUtil.java
new file mode 100644
index 000000000..e811a46e2
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+++ b/java/com/android/dialer/common/MathUtil.java
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+/*
+ * Copyright (C) 2016 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.dialer.common;
+
+/** Utility class for common math operations */
+public class MathUtil {
+
+  /**
+   * Interpolates between two integer values based on percentage.
+   *
+   * @param begin Begin value
+   * @param end End value
+   * @param percent Percentage value, between 0 and 1
+   * @return Interpolated result
+   */
+  public static int lerp(int begin, int end, float percent) {
+    return (int) (begin * (1 - percent) + end * percent);
+  }
+
+  /**
+   * Interpolates between two float values based on percentage.
+   *
+   * @param begin Begin value
+   * @param end End value
+   * @param percent Percentage value, between 0 and 1
+   * @return Interpolated result
+   */
+  public static float lerp(float begin, float end, float percent) {
+    return begin * (1 - percent) + end * percent;
+  }
+
+  /**
+   * Clamps a value between two bounds inclusively.
+   *
+   * @param value Value to be clamped
+   * @param min Lower bound
+   * @param max Upper bound
+   * @return Clamped value
+   */
+  public static float clamp(float value, float min, float max) {
+    return Math.max(min, Math.min(value, max));
+  }
+}