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

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 #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