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glwidget.h Example File
^{opengl/overpainting/glwidget.h}

    /****************************************************************************
    **
    ** Copyright (C) 2006-2006 Trolltech AS. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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);

    signals:
        void xRotationChanged(int angle);
        void yRotationChanged(int angle);
        void zRotationChanged(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 formatInstructions(int width, int height);
        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);

        GLuint object;
        int xRot;
        int yRot;
        int zRot;
        QPoint lastPos;
        QColor trolltechGreen;
        QColor trolltechPurple;
        QImage image;
        QList<Bubble*> bubbles;
        QTimer animationTimer;
    };

    #endif