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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.systemui.recents.misc;
import android.animation.TypeEvaluator;
import android.graphics.RectF;
/**
* This evaluator can be used to perform type interpolation between <code>RectF</code> values.
*/
public class RectFEvaluator implements TypeEvaluator<RectF> {
private RectF mRect = new RectF();
/**
* 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).
*
* <p>The object returned will be the <code>reuseRect</code> passed into the constructor.</p>
*
* @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 RectF evaluate(float fraction, RectF startValue, RectF endValue) {
float left = startValue.left + ((endValue.left - startValue.left) * fraction);
float top = startValue.top + ((endValue.top - startValue.top) * fraction);
float right = startValue.right + ((endValue.right - startValue.right) * fraction);
float bottom = startValue.bottom + ((endValue.bottom - startValue.bottom) * fraction);
mRect.set(left, top, right, bottom);
return mRect;
}
}
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