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

        /****************************************************************************
        **
        ** Copyright (C) 2006-2006 Trolltech ASA. 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:
        ** http://www.trolltech.com/products/qt/licensing.html or contact the
        ** sales department at sales@trolltech.com.
        **
        ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        **
        ****************************************************************************/

        #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