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

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        ** This file is part of the documentation of the Qt Toolkit.
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        ** License version 2.0 as published by the Free Software Foundation
        ** and appearing in the file LICENSE.GPL included in the packaging of
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        #include <QtGui>
        #include "widget.h"
        #include "helper.h"

        Widget::Widget(Helper *helper, QWidget *parent)
            : QWidget(parent), helper(helper)
        {
            elapsed = 0;
            setFixedSize(200, 200);
        }

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

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