Qt 4.6: trackball.h Example File (demos/boxes/trackball.h)

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# trackball.h Example File
demos/boxes/trackball.h

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     #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