mobile/android/base/animation/Rotate3DAnimation.java@b8a032363ba2 (annotated)
mobile/android/base/animation/Rotate3DAnimation.java
Thu, 22 Jan 2015 13:21:57 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Thu, 22 Jan 2015 13:21:57 +0100
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
- permissions
- -rw-r--r--
Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright (C) 2007 The Android Open Source Project |
| michael@0 | 3 | * |
| michael@0 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
| michael@0 | 5 | * you may not use this file except in compliance with the License. |
| michael@0 | 6 | * You may obtain a copy of the License at |
| michael@0 | 7 | * |
| michael@0 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
| michael@0 | 9 | * |
| michael@0 | 10 | * Unless required by applicable law or agreed to in writing, software |
| michael@0 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
| michael@0 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| michael@0 | 13 | * See the License for the specific language governing permissions and |
| michael@0 | 14 | * limitations under the License. |
| michael@0 | 15 | */ |
| michael@0 | 16 | |
| michael@0 | 17 | package org.mozilla.gecko.animation; |
| michael@0 | 18 | |
| michael@0 | 19 | import android.view.animation.Animation; |
| michael@0 | 20 | import android.view.animation.Transformation; |
| michael@0 | 21 | |
| michael@0 | 22 | import android.graphics.Camera; |
| michael@0 | 23 | import android.graphics.Matrix; |
| michael@0 | 24 | |
| michael@0 | 25 | /** |
| michael@0 | 26 | * An animation that rotates the view on the Y axis between two specified angles. |
| michael@0 | 27 | * This animation also adds a translation on the Z axis (depth) to improve the effect. |
| michael@0 | 28 | */ |
| michael@0 | 29 | public class Rotate3DAnimation extends Animation { |
| michael@0 | 30 | private final float mFromDegrees; |
| michael@0 | 31 | private final float mToDegrees; |
| michael@0 | 32 | |
| michael@0 | 33 | private final float mCenterX; |
| michael@0 | 34 | private final float mCenterY; |
| michael@0 | 35 | |
| michael@0 | 36 | private final float mDepthZ; |
| michael@0 | 37 | private final boolean mReverse; |
| michael@0 | 38 | private Camera mCamera; |
| michael@0 | 39 | |
| michael@0 | 40 | private int mWidth = 1; |
| michael@0 | 41 | private int mHeight = 1; |
| michael@0 | 42 | |
| michael@0 | 43 | /** |
| michael@0 | 44 | * Creates a new 3D rotation on the Y axis. The rotation is defined by its |
| michael@0 | 45 | * start angle and its end angle. Both angles are in degrees. The rotation |
| michael@0 | 46 | * is performed around a center point on the 2D space, definied by a pair |
| michael@0 | 47 | * of X and Y coordinates, called centerX and centerY. When the animation |
| michael@0 | 48 | * starts, a translation on the Z axis (depth) is performed. The length |
| michael@0 | 49 | * of the translation can be specified, as well as whether the translation |
| michael@0 | 50 | * should be reversed in time. |
| michael@0 | 51 | * |
| michael@0 | 52 | * @param fromDegrees the start angle of the 3D rotation |
| michael@0 | 53 | * @param toDegrees the end angle of the 3D rotation |
| michael@0 | 54 | * @param centerX the X center of the 3D rotation |
| michael@0 | 55 | * @param centerY the Y center of the 3D rotation |
| michael@0 | 56 | * @param reverse true if the translation should be reversed, false otherwise |
| michael@0 | 57 | */ |
| michael@0 | 58 | public Rotate3DAnimation(float fromDegrees, float toDegrees, |
| michael@0 | 59 | float centerX, float centerY, float depthZ, boolean reverse) { |
| michael@0 | 60 | mFromDegrees = fromDegrees; |
| michael@0 | 61 | mToDegrees = toDegrees; |
| michael@0 | 62 | mCenterX = centerX; |
| michael@0 | 63 | mCenterY = centerY; |
| michael@0 | 64 | mDepthZ = depthZ; |
| michael@0 | 65 | mReverse = reverse; |
| michael@0 | 66 | } |
| michael@0 | 67 | |
| michael@0 | 68 | @Override |
| michael@0 | 69 | public void initialize(int width, int height, int parentWidth, int parentHeight) { |
| michael@0 | 70 | super.initialize(width, height, parentWidth, parentHeight); |
| michael@0 | 71 | mCamera = new Camera(); |
| michael@0 | 72 | mWidth = width; |
| michael@0 | 73 | mHeight = height; |
| michael@0 | 74 | } |
| michael@0 | 75 | |
| michael@0 | 76 | @Override |
| michael@0 | 77 | protected void applyTransformation(float interpolatedTime, Transformation t) { |
| michael@0 | 78 | final float fromDegrees = mFromDegrees; |
| michael@0 | 79 | float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime); |
| michael@0 | 80 | |
| michael@0 | 81 | final Camera camera = mCamera; |
| michael@0 | 82 | final Matrix matrix = t.getMatrix(); |
| michael@0 | 83 | |
| michael@0 | 84 | camera.save(); |
| michael@0 | 85 | if (mReverse) { |
| michael@0 | 86 | camera.translate(0.0f, 0.0f, mDepthZ * interpolatedTime); |
| michael@0 | 87 | } else { |
| michael@0 | 88 | camera.translate(0.0f, 0.0f, mDepthZ * (1.0f - interpolatedTime)); |
| michael@0 | 89 | } |
| michael@0 | 90 | camera.rotateX(degrees); |
| michael@0 | 91 | camera.getMatrix(matrix); |
| michael@0 | 92 | camera.restore(); |
| michael@0 | 93 | |
| michael@0 | 94 | matrix.preTranslate(-mCenterX * mWidth, -mCenterY * mHeight); |
| michael@0 | 95 | matrix.postTranslate(mCenterX * mWidth, mCenterY * mHeight); |
| michael@0 | 96 | } |
| michael@0 | 97 | } |
