Qt Reference Documentation

trackball.h Example File

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 ** This file is part of the demonstration applications of the Qt Toolkit.
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 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
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 ** In addition, as a special exception, Nokia gives you certain additional
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 #ifndef TRACKBALL_H
 #define TRACKBALL_H

 #include <QtGui>

 #include <QtGui/qvector3d.h>
 #include <QtGui/qquaternion.h>

 class TrackBall
     enum TrackMode
     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;
     QQuaternion m_rotation;
     QVector3D m_axis;
     float m_angularVelocity;

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


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