60 lines
2.0 KiB
Java
60 lines
2.0 KiB
Java
/*
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* Copyright (C) 2009 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.graphics.animation.HasNativeInterpolator;
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import android.graphics.animation.NativeInterpolator;
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import android.graphics.animation.NativeInterpolatorFactory;
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import android.util.AttributeSet;
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/**
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* An interpolator where the change bounces at the end.
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*/
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@HasNativeInterpolator
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public class BounceInterpolator extends BaseInterpolator implements NativeInterpolator {
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public BounceInterpolator() {
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}
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@SuppressWarnings({"UnusedDeclaration"})
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public BounceInterpolator(Context context, AttributeSet attrs) {
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}
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private static float bounce(float t) {
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return t * t * 8.0f;
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}
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public float getInterpolation(float t) {
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// _b(t) = t * t * 8
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// bs(t) = _b(t) for t < 0.3535
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// bs(t) = _b(t - 0.54719) + 0.7 for t < 0.7408
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// bs(t) = _b(t - 0.8526) + 0.9 for t < 0.9644
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// bs(t) = _b(t - 1.0435) + 0.95 for t <= 1.0
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// b(t) = bs(t * 1.1226)
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t *= 1.1226f;
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if (t < 0.3535f) return bounce(t);
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else if (t < 0.7408f) return bounce(t - 0.54719f) + 0.7f;
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else if (t < 0.9644f) return bounce(t - 0.8526f) + 0.9f;
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else return bounce(t - 1.0435f) + 0.95f;
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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 NativeInterpolatorFactory.createBounceInterpolator();
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}
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} |