1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/animation/Rotate3DAnimation.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,97 @@
1.4 +/*
1.5 + * Copyright (C) 2007 The Android Open Source Project
1.6 + *
1.7 + * Licensed under the Apache License, Version 2.0 (the "License");
1.8 + * you may not use this file except in compliance with the License.
1.9 + * You may obtain a copy of the License at
1.10 + *
1.11 + * http://www.apache.org/licenses/LICENSE-2.0
1.12 + *
1.13 + * Unless required by applicable law or agreed to in writing, software
1.14 + * distributed under the License is distributed on an "AS IS" BASIS,
1.15 + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
1.16 + * See the License for the specific language governing permissions and
1.17 + * limitations under the License.
1.18 + */
1.19 +
1.20 +package org.mozilla.gecko.animation;
1.21 +
1.22 +import android.view.animation.Animation;
1.23 +import android.view.animation.Transformation;
1.24 +
1.25 +import android.graphics.Camera;
1.26 +import android.graphics.Matrix;
1.27 +
1.28 +/**
1.29 + * An animation that rotates the view on the Y axis between two specified angles.
1.30 + * This animation also adds a translation on the Z axis (depth) to improve the effect.
1.31 + */
1.32 +public class Rotate3DAnimation extends Animation {
1.33 + private final float mFromDegrees;
1.34 + private final float mToDegrees;
1.35 +
1.36 + private final float mCenterX;
1.37 + private final float mCenterY;
1.38 +
1.39 + private final float mDepthZ;
1.40 + private final boolean mReverse;
1.41 + private Camera mCamera;
1.42 +
1.43 + private int mWidth = 1;
1.44 + private int mHeight = 1;
1.45 +
1.46 + /**
1.47 + * Creates a new 3D rotation on the Y axis. The rotation is defined by its
1.48 + * start angle and its end angle. Both angles are in degrees. The rotation
1.49 + * is performed around a center point on the 2D space, definied by a pair
1.50 + * of X and Y coordinates, called centerX and centerY. When the animation
1.51 + * starts, a translation on the Z axis (depth) is performed. The length
1.52 + * of the translation can be specified, as well as whether the translation
1.53 + * should be reversed in time.
1.54 + *
1.55 + * @param fromDegrees the start angle of the 3D rotation
1.56 + * @param toDegrees the end angle of the 3D rotation
1.57 + * @param centerX the X center of the 3D rotation
1.58 + * @param centerY the Y center of the 3D rotation
1.59 + * @param reverse true if the translation should be reversed, false otherwise
1.60 + */
1.61 + public Rotate3DAnimation(float fromDegrees, float toDegrees,
1.62 + float centerX, float centerY, float depthZ, boolean reverse) {
1.63 + mFromDegrees = fromDegrees;
1.64 + mToDegrees = toDegrees;
1.65 + mCenterX = centerX;
1.66 + mCenterY = centerY;
1.67 + mDepthZ = depthZ;
1.68 + mReverse = reverse;
1.69 + }
1.70 +
1.71 + @Override
1.72 + public void initialize(int width, int height, int parentWidth, int parentHeight) {
1.73 + super.initialize(width, height, parentWidth, parentHeight);
1.74 + mCamera = new Camera();
1.75 + mWidth = width;
1.76 + mHeight = height;
1.77 + }
1.78 +
1.79 + @Override
1.80 + protected void applyTransformation(float interpolatedTime, Transformation t) {
1.81 + final float fromDegrees = mFromDegrees;
1.82 + float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime);
1.83 +
1.84 + final Camera camera = mCamera;
1.85 + final Matrix matrix = t.getMatrix();
1.86 +
1.87 + camera.save();
1.88 + if (mReverse) {
1.89 + camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime);
1.90 + } else {
1.91 + camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime));
1.92 + }
1.93 + camera.rotateX(degrees);
1.94 + camera.getMatrix(matrix);
1.95 + camera.restore();
1.96 +
1.97 + matrix.preTranslate(-mCenterX * mWidth, -mCenterY * mHeight);
1.98 + matrix.postTranslate(mCenterX * mWidth, mCenterY * mHeight);
1.99 + }
1.100 +}
