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/*
* Copyright (C) 2012 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.gallery3d.ui;
import android.view.animation.AccelerateDecelerateInterpolator;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.Interpolator;
public class CaptureAnimation {
// The amount of change for zooming out.
private static final float ZOOM_DELTA = 0.2f;
// Pre-calculated value for convenience.
private static final float ZOOM_IN_BEGIN = 1f - ZOOM_DELTA;
private static final Interpolator sZoomOutInterpolator =
new DecelerateInterpolator();
private static final Interpolator sZoomInInterpolator =
new AccelerateInterpolator();
private static final Interpolator sSlideInterpolator =
new AccelerateDecelerateInterpolator();
// Calculate the slide factor based on the give time fraction.
public static float calculateSlide(float fraction) {
return sSlideInterpolator.getInterpolation(fraction);
}
// Calculate the scale factor based on the given time fraction.
public static float calculateScale(float fraction) {
float value;
if (fraction <= 0.5f) {
// Zoom in for the beginning.
value = 1f - ZOOM_DELTA *
sZoomOutInterpolator.getInterpolation(fraction * 2);
} else {
// Zoom out for the ending.
value = ZOOM_IN_BEGIN + ZOOM_DELTA *
sZoomInInterpolator.getInterpolation((fraction - 0.5f) * 2f);
}
return value;
}
}