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# widget.cpp Example File
opengl/2dpainting/widget.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.
    **
    ** Contact info@trolltech.com if any conditions of this licensing are
    ** not clear to you.
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    ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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();
    }