1 files changed, 97 insertions, 0 deletions
diff --git a/mobile/android/base/java/org/mozilla/gecko/animation/Rotate3DAnimation.java b/mobile/android/base/java/org/mozilla/gecko/animation/Rotate3DAnimation.java
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index 000000000..7e8377f55
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+++ b/mobile/android/base/java/org/mozilla/gecko/animation/Rotate3DAnimation.java
@@ -0,0 +1,97 @@
+/*
+ * 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 org.mozilla.gecko.animation;
+
+import android.view.animation.Animation;
+import android.view.animation.Transformation;
+
+import android.graphics.Camera;
+import android.graphics.Matrix;
+
+/**
+ * An animation that rotates the view on the Y axis between two specified angles.
+ * This animation also adds a translation on the Z axis (depth) to improve the effect.
+ */
+public class Rotate3DAnimation extends Animation {
+    private final float mFromDegrees;
+    private final float mToDegrees;
+
+    private final float mCenterX;
+    private final float mCenterY;
+
+    private final float mDepthZ;
+    private final boolean mReverse;
+    private Camera mCamera;
+
+    private int mWidth = 1;
+    private int mHeight = 1;
+
+    /**
+     * Creates a new 3D rotation on the Y axis. The rotation is defined by its
+     * start angle and its end angle. Both angles are in degrees. The rotation
+     * is performed around a center point on the 2D space, defined by a pair
+     * of X and Y coordinates, called centerX and centerY. When the animation
+     * starts, a translation on the Z axis (depth) is performed. The length
+     * of the translation can be specified, as well as whether the translation
+     * should be reversed in time.
+     *
+     * @param fromDegrees the start angle of the 3D rotation
+     * @param toDegrees the end angle of the 3D rotation
+     * @param centerX the X center of the 3D rotation
+     * @param centerY the Y center of the 3D rotation
+     * @param reverse true if the translation should be reversed, false otherwise
+     */
+    public Rotate3DAnimation(float fromDegrees, float toDegrees,
+            float centerX, float centerY, float depthZ, boolean reverse) {
+        mFromDegrees = fromDegrees;
+        mToDegrees = toDegrees;
+        mCenterX = centerX;
+        mCenterY = centerY;
+        mDepthZ = depthZ;
+        mReverse = reverse;
+    }
+
+   @Override
+    public void initialize(int width, int height, int parentWidth, int parentHeight) {
+        super.initialize(width, height, parentWidth, parentHeight);
+        mCamera = new Camera();
+        mWidth = width;
+        mHeight = height;
+    }
+
+    @Override
+    protected void applyTransformation(float interpolatedTime, Transformation t) {
+        final float fromDegrees = mFromDegrees;
+        float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
+
+        final Camera camera = mCamera;
+        final Matrix matrix = t.getMatrix();
+
+        camera.save();
+        if (mReverse) {
+            camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
+        } else {
+            camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
+        }
+        camera.rotateX(degrees);
+        camera.getMatrix(matrix);
+        camera.restore();
+
+        matrix.preTranslate(-mCenterX * mWidth, -mCenterY * mHeight);
+        matrix.postTranslate(mCenterX * mWidth, mCenterY * mHeight);
+    }
+}