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glwidget.h Example File
opengl/grabber/glwidget.h

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 #ifndef GLWIDGET_H
 #define GLWIDGET_H

 #include <QGLWidget>

 class GLWidget : public QGLWidget
 {
     Q_OBJECT

 public:
     GLWidget(QWidget *parent = 0);
     ~GLWidget();

     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 paintGL();
     void resizeGL(int width, int height);
     void mousePressEvent(QMouseEvent *event);
     void mouseMoveEvent(QMouseEvent *event);

 private slots:
     void advanceGears();

 private:
     GLuint makeGear(const GLfloat *reflectance, GLdouble innerRadius,
                     GLdouble outerRadius, GLdouble thickness,
                     GLdouble toothSize, GLint toothCount);
     void drawGear(GLuint gear, GLdouble dx, GLdouble dy, GLdouble dz,
                   GLdouble angle);
     void normalizeAngle(int *angle);

     GLuint gear1;
     GLuint gear2;
     GLuint gear3;
     int xRot;
     int yRot;
     int zRot;
     int gear1Rot;

     QPoint lastPos;
 };

 #endif