# Qt 4.5: 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 "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