1 files changed, 56 insertions, 0 deletions
diff --git a/src/com/android/gallery3d/ui/CaptureAnimation.java b/src/com/android/gallery3d/ui/CaptureAnimation.java
new file mode 100644
index 000000000..87c054ab3
--- /dev/null
+++ b/src/com/android/gallery3d/ui/CaptureAnimation.java
@@ -0,0 +1,56 @@
+/*
+ * 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;
+    }
+}