| /* |
| * Copyright (C) 2013 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 android.animation; |
| |
| import android.graphics.Rect; |
| |
| /** |
| * This evaluator can be used to perform type interpolation between <code>Rect</code> values. |
| */ |
| public class RectEvaluator implements TypeEvaluator<Rect> { |
| |
| /** |
| * This function returns the result of linearly interpolating the start and |
| * end Rect values, with <code>fraction</code> representing the proportion |
| * between the start and end values. The calculation is a simple parametric |
| * calculation on each of the separate components in the Rect objects |
| * (left, top, right, and bottom). |
| * |
| * @param fraction The fraction from the starting to the ending values |
| * @param startValue The start Rect |
| * @param endValue The end Rect |
| * @return A linear interpolation between the start and end values, given the |
| * <code>fraction</code> parameter. |
| */ |
| @Override |
| public Rect evaluate(float fraction, Rect startValue, Rect endValue) { |
| return new Rect(startValue.left + (int)((endValue.left - startValue.left) * fraction), |
| startValue.top + (int)((endValue.top - startValue.top) * fraction), |
| startValue.right + (int)((endValue.right - startValue.right) * fraction), |
| startValue.bottom + (int)((endValue.bottom - startValue.bottom) * fraction)); |
| } |
| } |