Qt 5.6 | Qt Widgets | Boxes | trackball.h Example File

Qt 5.6.3 Reference Documentation

# trackball.h Example File

graphicsview/boxes/trackball.h

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      #ifndef TRACKBALL_H
      #define TRACKBALL_H

      #include <QtWidgets>

      #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