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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