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/*
* Copyright (C) 2015 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.volume;
import android.animation.TimeInterpolator;
public class SystemUIInterpolators {
public static final class LogDecelerateInterpolator implements TimeInterpolator {
private final float mBase;
private final float mDrift;
private final float mTimeScale;
private final float mOutputScale;
public LogDecelerateInterpolator() {
this(400f, 1.4f, 0);
}
private LogDecelerateInterpolator(float base, float timeScale, float drift) {
mBase = base;
mDrift = drift;
mTimeScale = 1f / timeScale;
mOutputScale = 1f / computeLog(1f);
}
private float computeLog(float t) {
return 1f - (float) Math.pow(mBase, -t * mTimeScale) + (mDrift * t);
}
@Override
public float getInterpolation(float t) {
return computeLog(t) * mOutputScale;
}
}
public static final class LogAccelerateInterpolator implements TimeInterpolator {
private final int mBase;
private final int mDrift;
private final float mLogScale;
public LogAccelerateInterpolator() {
this(100, 0);
}
private LogAccelerateInterpolator(int base, int drift) {
mBase = base;
mDrift = drift;
mLogScale = 1f / computeLog(1, mBase, mDrift);
}
private static float computeLog(float t, int base, int drift) {
return (float) -Math.pow(base, -t) + 1 + (drift * t);
}
@Override
public float getInterpolation(float t) {
return 1 - computeLog(1 - t, mBase, mDrift) * mLogScale;
}
}
public interface Callback {
void onAnimatingChanged(boolean animating);
}
}
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