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# gameboard.cpp Example File
tutorial/t13/gameboard.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2005-2006 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
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     ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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     #include <QApplication>
     #include <QFont>
     #include <QGridLayout>
     #include <QHBoxLayout>
     #include <QLCDNumber>
     #include <QLabel>
     #include <QPushButton>
     #include <QVBoxLayout>

     #include "cannonfield.h"
     #include "gameboard.h"
     #include "lcdrange.h"

     GameBoard::GameBoard(QWidget *parent)
         : QWidget(parent)
     {
         QPushButton *quit = new QPushButton(tr("&Quit"));
         quit->setFont(QFont("Times", 18, QFont::Bold));

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

         LCDRange *angle = new LCDRange(tr("ANGLE"));
         angle->setRange(5, 70);

         LCDRange *force = new LCDRange(tr("FORCE"));
         force->setRange(10, 50);

         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)));

         connect(cannonField, SIGNAL(hit()),
                 this, SLOT(hit()));
         connect(cannonField, SIGNAL(missed()),
                 this, SLOT(missed()));

         QPushButton *shoot = new QPushButton(tr("&Shoot"));
         shoot->setFont(QFont("Times", 18, QFont::Bold));

         connect(shoot, SIGNAL(clicked()),
                 this, SLOT(fire()));
         connect(cannonField, SIGNAL(canShoot(bool)),
                 shoot, SLOT(setEnabled(bool)));

         QPushButton *restart = new QPushButton(tr("&New Game"));
         restart->setFont(QFont("Times", 18, QFont::Bold));

         connect(restart, SIGNAL(clicked()), this, SLOT(newGame()));

         hits = new QLCDNumber(2);
         hits->setSegmentStyle(QLCDNumber::Filled);

         shotsLeft = new QLCDNumber(2);
         shotsLeft->setSegmentStyle(QLCDNumber::Filled);

         QLabel *hitsLabel = new QLabel(tr("HITS"));
         QLabel *shotsLeftLabel = new QLabel(tr("SHOTS LEFT"));

         QHBoxLayout *topLayout = new QHBoxLayout;
         topLayout->addWidget(shoot);
         topLayout->addWidget(hits);
         topLayout->addWidget(hitsLabel);
         topLayout->addWidget(shotsLeft);
         topLayout->addWidget(shotsLeftLabel);
         topLayout->addStretch(1);
         topLayout->addWidget(restart);

         QVBoxLayout *leftLayout = new QVBoxLayout;
         leftLayout->addWidget(angle);
         leftLayout->addWidget(force);

         QGridLayout *gridLayout = new QGridLayout;
         gridLayout->addWidget(quit, 0, 0);
         gridLayout->addLayout(topLayout, 0, 1);
         gridLayout->addLayout(leftLayout, 1, 0);
         gridLayout->addWidget(cannonField, 1, 1, 2, 1);
         gridLayout->setColumnStretch(1, 10);
         setLayout(gridLayout);

         angle->setValue(60);
         force->setValue(25);
         angle->setFocus();

         newGame();
     }

     void GameBoard::fire()
     {
         if (cannonField->gameOver() || cannonField->isShooting())
             return;
         shotsLeft->display(shotsLeft->intValue() - 1);
         cannonField->shoot();
     }

     void GameBoard::hit()
     {
         hits->display(hits->intValue() + 1);
         if (shotsLeft->intValue() == 0)
             cannonField->setGameOver();
         else
             cannonField->newTarget();
     }

     void GameBoard::missed()
     {
         if (shotsLeft->intValue() == 0)
             cannonField->setGameOver();
     }

     void GameBoard::newGame()
     {
         shotsLeft->display(15);
         hits->display(0);
         cannonField->restartGame();
         cannonField->newTarget();
     }