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<td align="right" valign="top" width="230"><img src="images/trolltech-logo.png" align="right" width="203" height="32" border="0" /></td></tr></table><h1 align="center">main.cpp Example File<br /><small><small>tutorial/t12/main.cpp</small></small></h1>

<pre>  /****************************************************************************

** This file is part of the documentation of the Qt Toolkit.

** This file may be distributed under the terms of the Q Public License

** as defined by Trolltech AS of Norway and appearing in the file

** LICENSE.QPL included in the packaging of this file.

** This file may be distributed and/or modified under the terms of the

** GNU General Public License version 2 as published by the Free Software

** Foundation and appearing in the file LICENSE.GPL included in the

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** not clear to you.

** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE

** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

****************************************************************************/

/****************************************************************

** Qt tutorial 12

****************************************************************/

#include <QApplication>

#include <QFont>

#include <QGridLayout>

#include <QHBoxLayout>

#include <QLCDNumber>

#include <QPushButton>

#include <QVBoxLayout>

#include "cannonfield.h"

#include "lcdrange.h"

class MyWidget : public QWidget

{

public:

MyWidget(QWidget *parent = 0);

};

MyWidget::MyWidget(QWidget *parent)

: QWidget(parent)

{

QPushButton *quit = new QPushButton("&Quit");

quit->setFont(QFont("Times", 18, QFont::Bold));

connect(quit, SIGNAL(clicked()), qApp, SLOT(quit()));

LCDRange *angle = new LCDRange("ANGLE");

angle->setRange(5, 70);

LCDRange *force = new LCDRange("FORCE");

force->setRange(10, 50);

CannonField *cannonField = new CannonField;

connect(angle, SIGNAL(valueChanged(int)),

cannonField, SLOT(setAngle(int)));

connect(cannonField, SIGNAL(angleChanged(int)),

angle, SLOT(setValue(int)));

connect(force, SIGNAL(valueChanged(int)),

cannonField, SLOT(setForce(int)));

connect(cannonField, SIGNAL(forceChanged(int)),

force, SLOT(setValue(int)));

QPushButton *shoot = new QPushButton("&Shoot");

shoot->setFont(QFont("Times", 18, QFont::Bold));

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connect(shoot, SIGNAL(clicked()), cannonField, SLOT(shoot()));

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QHBoxLayout *topLayout = new QHBoxLayout;

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topLayout->addWidget(shoot);

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topLayout->addStretch(1);

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QVBoxLayout *leftLayout = new QVBoxLayout;

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leftLayout->addWidget(angle);

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leftLayout->addWidget(force);

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QGridLayout *gridLayout = new QGridLayout;

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gridLayout->addWidget(quit, 0, 0);

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gridLayout->addLayout(topLayout, 0, 1);

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gridLayout->addLayout(leftLayout, 1, 0);

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gridLayout->addWidget(cannonField, 1, 1, 2, 1);

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gridLayout->setColumnStretch(1, 10);

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setLayout(gridLayout);

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angle->setValue(60);

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force->setValue(25);

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angle->setFocus();

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}

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int main(int argc, char *argv[])

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{

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QApplication app(argc, argv);

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MyWidget widget;

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widget.setGeometry(100, 100, 500, 355);

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widget.show();

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return app.exec();

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}</pre>

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