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/* * Copyright (C) 2010 The Android Open Source Project *// www . j a va 2s. com * 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)); } }