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# cannonfield.cpp Example File
tutorial/t8/cannonfield.cpp

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        **
        ** Copyright (C) 2005-2006 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
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        ** http://www.trolltech.com/products/qt/opensource.html
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        ** review the following information:
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        #include <QPainter>

        #include "cannonfield.h"

        CannonField::CannonField(QWidget *parent)
            : QWidget(parent)
        {
            currentAngle = 45;
            setPalette(QPalette(QColor(250, 250, 200)));
            setAutoFillBackground(true);
        }

        void CannonField::setAngle(int angle)
        {
            if (angle < 5)
                angle = 5;
            if (angle > 70)
                angle = 70;
            if (currentAngle == angle)
                return;
            currentAngle = angle;
            update();
            emit angleChanged(currentAngle);
        }

        void CannonField::paintEvent(QPaintEvent * /* event */)
        {
            QPainter painter(this);
            painter.drawText(200, 200,
                             tr("Angle = ") + QString::number(currentAngle));
        }