Android Open Source - MnemR Rotate3d Animation

• Back to Development/tool  ↑

From Project

Back to project page MnemR.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
  * Copyright (c) 2011: mnemr.com contributors. All rights reserved.
  */*w w w .  j  a v a  2  s  .co  m*/
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published 
  * the Free Software Foundation, either version 3 of the License, 
  * (at your option) any later version.
  *
  * program is distributed in the hope that it will be 
  * but WITHOUT ANY WARRANTY; without even the implied warranty 
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See 
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public 
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  **/

package com.mnemr.ui.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, Math.abs(fromDegrees)/90 * mDepthZ + (Math.abs(mToDegrees) - fromDegrees)/90 * mDepthZ * interpolatedTime);
        } else {
            camera.translate(0.0f, 0.0f, Math.abs(fromDegrees)/90 * mDepthZ + (mToDegrees - Math.abs(fromDegrees))/90 * mDepthZ * interpolatedTime);
        }
        camera.rotateY(degrees);
        camera.getMatrix(matrix);
        camera.restore();

        matrix.preTranslate(-centerX, -centerY);
        matrix.postTranslate(centerX, centerY);
    }
}

Java Source Code List

• Back to Development/tool  ↑