trackball.h Example File

demos/boxes/trackball.h
 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the demonstration applications of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** GNU Lesser General Public License Usage
 ** This file may be used under the terms of the GNU Lesser General Public
 ** License version 2.1 as published by the Free Software Foundation and
 ** appearing in the file LICENSE.LGPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU Lesser
 ** General Public License version 2.1 requirements will be met:
 ** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights. These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU General
 ** Public License version 3.0 as published by the Free Software Foundation
 ** and appearing in the file LICENSE.GPL included in the packaging of this
 ** file. Please review the following information to ensure the GNU General
 ** Public License version 3.0 requirements will be met:
 ** http://www.gnu.org/copyleft/gpl.html.
 **
 ** Other Usage
 ** Alternatively, this file may be used in accordance with the terms and
 ** conditions contained in a signed written agreement between you and Nokia.
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #ifndef TRACKBALL_H
 #define TRACKBALL_H

 #include <QtGui>

 #include <QtGui/qvector3d.h>
 #include <QtGui/qquaternion.h>

 class TrackBall
 {
 public:
     enum TrackMode
     {
         Plane,
         Sphere,
     };
     TrackBall(TrackMode mode = Sphere);
     TrackBall(float angularVelocity, const QVector3D& axis, TrackMode mode = Sphere);
     // coordinates in [-1,1]x[-1,1]
     void push(const QPointF& p, const QQuaternion &transformation);
     void move(const QPointF& p, const QQuaternion &transformation);
     void release(const QPointF& p, const QQuaternion &transformation);
     void start(); // starts clock
     void stop(); // stops clock
     QQuaternion rotation() const;
 private:
     QQuaternion m_rotation;
     QVector3D m_axis;
     float m_angularVelocity;

     QPointF m_lastPos;
     QTime m_lastTime;
     bool m_paused;
     bool m_pressed;
     TrackMode m_mode;
 };

 #endif