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    <title>Qt 4.0: gameboard.cpp Example File (tutorial/t14/gameboard.cpp)</title>
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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">gameboard.cpp Example File<br /><small><small>tutorial/t14/gameboard.cpp</small></small></h1>
<pre>&nbsp;   /****************************************************************************
    **
    ** Copyright (C) 2005-2005 Trolltech AS. All rights reserved.
    **
    ** 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
** packaging of this file.
**
** See http://www.trolltech.com/pricing.html or email sales@trolltech.com for
**   information about Qt Commercial License Agreements.
** See http://www.trolltech.com/qpl/ for QPL licensing information.
** See http://www.trolltech.com/gpl/ for GPL licensing information.
**
** Contact info@trolltech.com if any conditions of this licensing are
** 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.
    **
    ****************************************************************************/

    /****************************************************************
    **
    ** Implementation of GameBoard class, Qt tutorial 14
    **
    ****************************************************************/

    #include &lt;QApplication&gt;
    #include &lt;QFont&gt;
    #include &lt;QGridLayout&gt;
    #include &lt;QHBoxLayout&gt;
    #include &lt;QLCDNumber&gt;
    #include &lt;QLabel&gt;
    #include &lt;QPushButton&gt;
    #include &lt;QShortcut&gt;
    #include &lt;QVBoxLayout&gt;
    #include &lt;QWidget&gt;

    #include &quot;cannonfield.h&quot;
    #include &quot;gameboard.h&quot;
    #include &quot;lcdrange.h&quot;

    GameBoard::GameBoard(QWidget *parent)
        : QWidget(parent)
    {
        QPushButton *quit = new QPushButton(&quot;&amp;Quit&quot;);
        quit-&gt;setFont(QFont(&quot;Times&quot;, 18, QFont::Bold));

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

        LCDRange *angle = new LCDRange(&quot;ANGLE&quot;);
        angle-&gt;setRange(5, 70);

        LCDRange *force = new LCDRange(&quot;FORCE&quot;);
        force-&gt;setRange(10, 50);

        QFrame *cannonBox = new QFrame;
        cannonBox-&gt;setFrameStyle(QFrame::WinPanel | QFrame::Sunken);

        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(&quot;&amp;Shoot&quot;);
        shoot-&gt;setFont(QFont(&quot;Times&quot;, 18, QFont::Bold));

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

        QPushButton *restart = new QPushButton(&quot;&amp;New Game&quot;);
        restart-&gt;setFont(QFont(&quot;Times&quot;, 18, QFont::Bold));

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

        hits = new QLCDNumber(2);
        shotsLeft = new QLCDNumber(2);
        QLabel *hitsLabel = new QLabel(&quot;HITS&quot;);
        QLabel *shotsLeftLabel = new QLabel(&quot;SHOTS LEFT&quot;);

        (void) new QShortcut(Qt::Key_Enter, this, SLOT(fire()));
        (void) new QShortcut(Qt::Key_Return, this, SLOT(fire()));
        (void) new QShortcut(Qt::CTRL + Qt::Key_Q, this, SLOT(close()));

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

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

        QVBoxLayout *cannonLayout = new QVBoxLayout;
        cannonLayout-&gt;addWidget(cannonField);
        cannonBox-&gt;setLayout(cannonLayout);

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

        angle-&gt;setValue(60);
        force-&gt;setValue(25);
        angle-&gt;setFocus();

        newGame();
    }

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

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

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

    void GameBoard::newGame()
    {
        shotsLeft-&gt;display(15);
        hits-&gt;display(0);
        cannonField-&gt;restartGame();
        cannonField-&gt;newTarget();
    }</pre>
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