1 files changed, 42 insertions, 0 deletions
diff --git a/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/IntEvaluator.java b/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/IntEvaluator.java
new file mode 100644
index 000000000..ed5e79ec6
--- /dev/null
+++ b/actionbarsherlock/src/com/actionbarsherlock/internal/nineoldandroids/animation/IntEvaluator.java
@@ -0,0 +1,42 @@
+/*
+ * Copyright (C) 2010 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.actionbarsherlock.internal.nineoldandroids.animation;
+
+/**
+ * This evaluator can be used to perform type interpolation between <code>int</code> values.
+ */
+public class IntEvaluator implements TypeEvaluator<Integer> {
+
+    /**
+     * This function returns the result of linearly interpolating the start and end values, with
+     * <code>fraction</code> representing the proportion between the start and end values. The
+     * calculation is a simple parametric calculation: <code>result = x0 + t * (v1 - v0)</code>,
+     * where <code>x0</code> is <code>startValue</code>, <code>x1</code> is <code>endValue</code>,
+     * and <code>t</code> is <code>fraction</code>.
+     *
+     * @param fraction   The fraction from the starting to the ending values
+     * @param startValue The start value; should be of type <code>int</code> or
+     *                   <code>Integer</code>
+     * @param endValue   The end value; should be of type <code>int</code> or <code>Integer</code>
+     * @return A linear interpolation between the start and end values, given the
+     *         <code>fraction</code> parameter.
+     */
+    public Integer evaluate(float fraction, Integer startValue, Integer endValue) {
+        int startInt = startValue;
+        return (int)(startInt + fraction * (endValue - startInt));
+    }
+}
+\ No newline at end of file