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# glwidget.cpp Example File
opengl/2dpainting/glwidget.cpp

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        ** Copyright (C) 2006-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the example classes of the Qt Toolkit.
        **
        ** Licensees holding valid Qt Preview licenses may use this file in
        ** accordance with the Qt Preview License Agreement provided with the
        ** Software.
        **
        ** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
        ** information about Qt Commercial License Agreements.
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        ** Contact info@trolltech.com if any conditions of this licensing are
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        #include <QtGui>
        #include "glwidget.h"
        #include "helper.h"

        GLWidget::GLWidget(Helper *helper, QWidget *parent)
            : QGLWidget(QGLFormat(QGL::SampleBuffers), parent), helper(helper)
        {
            elapsed = 0;
            setFixedSize(200, 200);
        }

        void GLWidget::animate()
        {
            elapsed = (elapsed + qobject_cast<QTimer*>(sender())->interval()) % 1000;
            repaint();
        }

        void GLWidget::paintEvent(QPaintEvent *event)
        {
            QPainter painter;
            painter.begin(this);
            painter.setRenderHint(QPainter::Antialiasing);
            helper->paint(&painter, event, elapsed);
            painter.end();
        }