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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 "vector.h"

 class TrackBall
 {
 public:
     enum TrackMode
     {
         Plane,
         Sphere,
     };
     TrackBall(TrackMode mode = Sphere);
     TrackBall(float angularVelocity, const gfx::Vector3f& axis, TrackMode mode = Sphere);
     // coordinates in [-1,1]x[-1,1]
     void push(const QPointF& p, const gfx::Quaternionf &transformation);
     void move(const QPointF& p, const gfx::Quaternionf &transformation);
     void release(const QPointF& p, const gfx::Quaternionf &transformation);
     void start(); // starts clock
     void stop(); // stops clock
     gfx::Quaternionf rotation() const;
 private:
     gfx::Quaternionf m_rotation;
     gfx::Vector3f m_axis;
     float m_angularVelocity;

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

 #endif