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    41 

    42 #ifndef TRACKBALL_H

    43 #define TRACKBALL_H

    44 

    45 #include <QtGui>

    46 

    47 #include <QtGui/qvector3d.h>

    48 #include <QtGui/qquaternion.h>

    49 

    50 class TrackBall

    51 {

    52 public:

    53     enum TrackMode

    54     {

    55         Plane,

    56         Sphere,

    57     };

    58     TrackBall(TrackMode mode = Sphere);

    59     TrackBall(float angularVelocity, const QVector3D& axis, TrackMode mode = Sphere);

    60     // coordinates in [-1,1]x[-1,1]

    61     void push(const QPointF& p, const QQuaternion &transformation);

    62     void move(const QPointF& p, const QQuaternion &transformation);

    63     void release(const QPointF& p, const QQuaternion &transformation);

    64     void start(); // starts clock

    65     void stop(); // stops clock

    66     QQuaternion rotation() const;

    67 private:

    68     QQuaternion m_rotation;

    69     QVector3D m_axis;

    70     float m_angularVelocity;

    71 

    72     QPointF m_lastPos;

    73     QTime m_lastTime;

    74     bool m_paused;

    75     bool m_pressed;

    76     TrackMode m_mode;

    77 };

    78 

    79 #endif