qt5base-lts/demos/boxes/trackball.h

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/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the demonstration applications of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** GNU Lesser General Public License Usage
** 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 will be met:
** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain additional
** rights. These rights are described in the Nokia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU General
** Public License version 3.0 as published by the Free Software Foundation
** and appearing in the file LICENSE.GPL included in the packaging of this
** file. Please review the following information to ensure the GNU General
** Public License version 3.0 requirements will be met:
** http://www.gnu.org/copyleft/gpl.html.
**
** Other Usage
** Alternatively, this file may be used in accordance with the terms and
** conditions contained in a signed written agreement between you and Nokia.
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef TRACKBALL_H
#define TRACKBALL_H
#include <QtGui>
#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