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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