| /* |
| * 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; |
| } |
| } |