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 package com.android.systemui.recents.misc; 17 18 import android.animation.TypeEvaluator; 19 import android.graphics.RectF; 20 21 /** 22 * This evaluator can be used to perform type interpolation between <code>RectF</code> values. 23 */ 24 public class RectFEvaluator implements TypeEvaluator<RectF> { 25 26 private RectF mRect = new RectF(); 27 28 /** 29 * This function returns the result of linearly interpolating the start and 30 * end Rect values, with <code>fraction</code> representing the proportion 31 * between the start and end values. The calculation is a simple parametric 32 * calculation on each of the separate components in the Rect objects 33 * (left, top, right, and bottom). 34 * 35 * <p>The object returned will be the <code>reuseRect</code> passed into the constructor.</p> 36 * 37 * @param fraction The fraction from the starting to the ending values 38 * @param startValue The start Rect 39 * @param endValue The end Rect 40 * @return A linear interpolation between the start and end values, given the 41 * <code>fraction</code> parameter. 42 */ 43 @Override 44 public RectF evaluate(float fraction, RectF startValue, RectF endValue) { 45 float left = startValue.left + ((endValue.left - startValue.left) * fraction); 46 float top = startValue.top + ((endValue.top - startValue.top) * fraction); 47 float right = startValue.right + ((endValue.right - startValue.right) * fraction); 48 float bottom = startValue.bottom + ((endValue.bottom - startValue.bottom) * fraction); 49 mRect.set(left, top, right, bottom); 50 return mRect; 51 } 52 } 53
