/*
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* Copyright (C) 2007 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view.animation;
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import android.content.Context;
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import android.util.AttributeSet;
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import com.android.internal.view.animation.HasNativeInterpolator;
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import com.android.internal.view.animation.NativeInterpolatorFactory;
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import com.android.internal.view.animation.NativeInterpolatorFactoryHelper;
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/**
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* An interpolator where the rate of change starts and ends slowly but
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* accelerates through the middle.
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*/
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@HasNativeInterpolator
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public class AccelerateDecelerateInterpolator extends BaseInterpolator
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implements NativeInterpolatorFactory {
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public AccelerateDecelerateInterpolator() {
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}
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@SuppressWarnings({"UnusedDeclaration"})
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public AccelerateDecelerateInterpolator(Context context, AttributeSet attrs) {
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}
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public float getInterpolation(float input) {
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return (float)(Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f;
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}
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/** @hide */
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@Override
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public long createNativeInterpolator() {
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return NativeInterpolatorFactoryHelper.createAccelerateDecelerateInterpolator();
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}
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}
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