| /* |
| * 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 com.example.android.apis.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; |
| |
| /** |
| * 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, definied 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(); |
| } |
| |
| @Override |
| protected void applyTransformation(float interpolatedTime, Transformation t) { |
| final float fromDegrees = mFromDegrees; |
| float degrees = fromDegrees + ((mToDegrees - fromDegrees) * interpolatedTime); |
| |
| final float centerX = mCenterX; |
| final float centerY = mCenterY; |
| 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.rotateY(degrees); |
| camera.getMatrix(matrix); |
| camera.restore(); |
| |
| matrix.preTranslate(-centerX, -centerY); |
| matrix.postTranslate(centerX, centerY); |
| } |
| } |