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/*
* Copyright (C) 2007 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.dreams.phototable;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
import android.view.animation.LinearInterpolator;
/**
* An interpolator where the rate of change starts out quickly and
* and then decelerates.
*
*/
public class SoftLandingInterpolator implements Interpolator {
private final LinearInterpolator fly;
private final DecelerateInterpolator slide;
private final float mI;
private final float mO;
private final float upperRange;
private final float bottom;
private final float top;
public SoftLandingInterpolator(float i, float o) {
fly = new LinearInterpolator();
slide = new DecelerateInterpolator();
mI = i;
mO = o;
final float epsilon = Math.min(mI / 2f, (1f - mI) / 2f);
bottom = mI - epsilon;
top = mI + epsilon;
upperRange = 1f - bottom;
}
public float getInterpolation(float input) {
final float f = fly.getInterpolation(input / upperRange) * mO;
final float s = slide.getInterpolation((input - bottom) / upperRange) * (1f - mO) + mO;
float value;
if (input < bottom) {
value = f;
} else if (input < top) {
final float alpha = (input - bottom) / (top - bottom);
value = (1f - alpha) * f + alpha * s;
} else {
value = s;
}
return value;
}
}
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