cannonfield.cpp
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/****************************************************************************
**
** Copyright (C) 2005-2007 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes 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.
**
****************************************************************************/
#include <QPaintEvent>
#include <QPainter>
#include "cannonfield.h"
CannonField::CannonField(QWidget *parent)
: QWidget(parent)
{
currentAngle = 45;
currentForce = 0;
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(cannonRect());
emit angleChanged(currentAngle);
}
void CannonField::setForce(int force)
{
if (force < 0)
force = 0;
if (currentForce == force)
return;
currentForce = force;
emit forceChanged(currentForce);
}
void CannonField::paintEvent(QPaintEvent * /* event */)
{
QPainter painter(this);
painter.setPen(Qt::NoPen);
painter.setBrush(Qt::blue);
painter.translate(0, height());
painter.drawPie(QRect(-35, -35, 70, 70), 0, 90 * 16);
painter.rotate(-currentAngle);
painter.drawRect(QRect(30, -5, 20, 10));
}
QRect CannonField::cannonRect() const
{
QRect result(0, 0, 50, 50);
result.moveBottomLeft(rect().bottomLeft());
return result;
}