/****************************************************************************+
−
**+
−
** Copyright (C) 2010 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.+
−
**+
−
** $QT_BEGIN_LICENSE:LGPL$+
−
** No Commercial Usage+
−
** This file contains pre-release code and may not be distributed.+
−
** You may use this file in accordance with the terms and conditions+
−
** contained in the Technology Preview License Agreement accompanying+
−
** this package.+
−
**+
−
** GNU Lesser General Public License Usage+
−
** Alternatively, 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.+
−
**+
−
** If you have questions regarding the use of this file, please contact+
−
** Nokia at qt-info@nokia.com.+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
**+
−
** $QT_END_LICENSE$+
−
**+
−
****************************************************************************/+
−
+
−
#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+
−