diff options
Diffstat (limited to 'com/android/systemui/shared/recents/utilities/RectFEvaluator.java')
-rw-r--r-- | com/android/systemui/shared/recents/utilities/RectFEvaluator.java | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/com/android/systemui/shared/recents/utilities/RectFEvaluator.java b/com/android/systemui/shared/recents/utilities/RectFEvaluator.java new file mode 100644 index 00000000..51c1b5aa --- /dev/null +++ b/com/android/systemui/shared/recents/utilities/RectFEvaluator.java @@ -0,0 +1,52 @@ +/* + * 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.shared.recents.utilities; + +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 final 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; + } +} |