AccelerateDecelerateInterpolator.java
/*
* Copyright 2018 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 androidx.core.animation;
import androidx.annotation.FloatRange;
/**
* An interpolator where the rate of change starts and ends slowly but
* accelerates through the middle.
*/
public class AccelerateDecelerateInterpolator implements Interpolator {
public AccelerateDecelerateInterpolator() {
}
@Override
@FloatRange(from = 0, to = 1)
public float getInterpolation(@FloatRange(from = 0, to = 1) float input) {
return (float) (Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f;
}
}