Long live Qt!

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diff --git a/demos/boxes/trackball.h b/demos/boxes/trackball.h
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the demonstration applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#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