/******************************************************************************** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.**** This file is part of the example classes of the Qt Toolkit.**** This file may be used under the terms of the GNU General Public** License version 2.0 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 GNU** General Public Licensing requirements will be met:** http://www.trolltech.com/products/qt/opensource.html**** If you are unsure which license is appropriate for your use, please** review the following information:** http://www.trolltech.com/products/qt/licensing.html or contact the** sales department at sales@trolltech.com.**** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.******************************************************************************/#ifndef GLWIDGET_H#define GLWIDGET_H#include <QBrush>#include <QFont>#include <QImage>#include <QPen>#include <QGLWidget>#include <QTimer>class Bubble;class QPaintEvent;class QWidget;class GLWidget : public QGLWidget{    Q_OBJECTpublic:    GLWidget(QWidget *parent = 0);    ~GLWidget();    QSize sizeHint() const;    int xRotation() const { return xRot; }    int yRotation() const { return yRot; }    int zRotation() const { return zRot; }public slots:    void setXRotation(int angle);    void setYRotation(int angle);    void setZRotation(int angle);signals:    void xRotationChanged(int angle);    void yRotationChanged(int angle);    void zRotationChanged(int angle);protected:    void initializeGL();    void paintEvent(QPaintEvent *event);    void resizeGL(int width, int height);    void mousePressEvent(QMouseEvent *event);    void mouseMoveEvent(QMouseEvent *event);    void showEvent(QShowEvent *event);private slots:    void animate();private:    GLuint makeObject();    void createBubbles(int number);    void formatInstructions(int width, int height);    void extrude(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2);    void normalizeAngle(int *angle);    void quad(GLdouble x1, GLdouble y1, GLdouble x2, GLdouble y2,              GLdouble x3, GLdouble y3, GLdouble x4, GLdouble y4);    void setupViewport(int width, int height);    GLuint object;    int xRot;    int yRot;    int zRot;    QPoint lastPos;    QColor trolltechGreen;    QColor trolltechPurple;    QImage image;    QList<Bubble*> bubbles;    QTimer animationTimer;};#endif