glwidget.h Example File
opengl/overpainting/glwidget.h

 /****************************************************************************
 **
 ** Copyright (C) 2006-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact qt-sales@nokia.com if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
 **
 ** 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_OBJECT

 public:
     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);

 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 drawInstructions(QPainter *painter);
     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;
     QList<Bubble*> bubbles;
     QTimer animationTimer;
 };

 #endif