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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/life/life.doc:4 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>Conway's Game of Life</title>
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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>Conway's Game of Life</h1>
<p>
<hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/life.h 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef LIFE_H
#define LIFE_H
#include <<a href="qframe-h.html">qframe.h</a>>
class LifeWidget : public <a href="qframe.html">QFrame</a>
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
public:
LifeWidget( int s = 10, QWidget *parent = 0, const char *name = 0 );
void setPoint( int i, int j );
int maxCol() { return maxi; }
int maxRow() { return maxj; }
public slots:
void nextGeneration();
void clear();
protected:
virtual void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
virtual void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
virtual void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> * );
virtual void resizeEvent( <a href="qresizeevent.html">QResizeEvent</a> * );
void mouseHandle( const <a href="qpoint.html">QPoint</a> &pos );
private:
enum { MAXSIZE = 50, MINSIZE = 10, BORDER = 5 };
bool cells[2][MAXSIZE + 2][MAXSIZE + 2];
int current;
int maxi, maxj;
int pos2index( int x )
{
return ( x - BORDER ) / SCALE + 1;
}
int index2pos( int i )
{
return ( i - 1 ) * SCALE + BORDER;
}
int SCALE;
};
#endif // LIFE_H
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/life.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "life.h"
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qdrawutil-h.html">qdrawutil.h</a>>
#include <<a href="qcheckbox-h.html">qcheckbox.h</a>>
#include <<a href="qevent-h.html">qevent.h</a>>
#include <<a href="qapplication-h.html">qapplication.h</a>>
// The main game of life widget
<a name="f517"></a>LifeWidget::LifeWidget( int s, QWidget *parent, const char *name )
: <a href="qframe.html">QFrame</a>( parent, name )
{
SCALE = s;
maxi = maxj = 50;
<a href="qwidget.html#setMinimumSize">setMinimumSize</a>( MINSIZE * SCALE + 2 * BORDER,
MINSIZE * SCALE + 2 * BORDER );
<a href="qwidget.html#setMaximumSize">setMaximumSize</a>( MAXSIZE * SCALE + 2 * BORDER,
MAXSIZE * SCALE + 2 * BORDER );
<a href="qwidget.html#setSizeIncrement">setSizeIncrement</a>( SCALE, SCALE);
clear();
<a href="qwidget.html#resize">resize</a>( maxi * SCALE + 2 * BORDER , maxj * SCALE + 2 * BORDER );
}
void <a name="f518"></a>LifeWidget::clear()
{
current = 0;
for ( int t = 0; t < 2; t++ )
for ( int i = 0; i < MAXSIZE + 2; i++ )
for ( int j = 0; j < MAXSIZE + 2; j++ )
cells[t][i][j] = FALSE;
<a href="qwidget.html#repaint">repaint</a>();
}
// We assume that the size will never be beyond the maximum size set
// this is not in general TRUE, but in practice it's good enough for
// this program
<a name="x1889"></a>void LifeWidget::<a href="qframe.html#resizeEvent">resizeEvent</a>( <a href="qresizeevent.html">QResizeEvent</a> * e )
{
<a name="x1895"></a> maxi = (e-><a href="qresizeevent.html#size">size</a>().width() - 2 * BORDER) / SCALE;
maxj = (e-><a href="qresizeevent.html#size">size</a>().height() - 2 * BORDER) / SCALE;
}
void <a name="f519"></a>LifeWidget::setPoint( int i, int j )
{
if ( i < 1 || i > maxi || j < 1 || j > maxi )
return;
cells[current][i][j] = TRUE;
<a href="qwidget.html#repaint">repaint</a>( index2pos(i), index2pos(j), SCALE, SCALE, FALSE );
}
void <a name="f520"></a>LifeWidget::mouseHandle( const <a href="qpoint.html">QPoint</a> &pos )
{
<a name="x1893"></a> int i = pos2index( pos.<a href="qpoint.html#x">x</a>() );
<a name="x1894"></a> int j = pos2index( pos.<a href="qpoint.html#y">y</a>() );
setPoint( i, j );
}
<a name="x1896"></a>void LifeWidget::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
<a name="x1891"></a> mouseHandle( e-><a href="qmouseevent.html#pos">pos</a>() );
}
<a name="x1897"></a>void LifeWidget::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
<a name="x1890"></a> if ( e-><a href="qmouseevent.html#button">button</a>() == QMouseEvent::LeftButton )
mouseHandle( e-><a href="qmouseevent.html#pos">pos</a>() );
}
void <a name="f521"></a>LifeWidget::nextGeneration()
{
for ( int i = 1; i <= MAXSIZE; i++ ) {
for ( int j = 1; j <= MAXSIZE; j++ ) {
int t = cells[current][i - 1][j - 1]
+ cells[current][i - 1][j]
+ cells[current][i - 1][j + 1]
+ cells[current][i][j - 1]
+ cells[current][i][j + 1]
+ cells[current][i + 1][j - 1]
+ cells[current][i + 1][j]
+ cells[current][i + 1][j + 1];
cells[!current][i][j] = ( t == 3 ||
t == 2 && cells[current][i][j] );
}
}
current = !current;
<a href="qwidget.html#repaint">repaint</a>( FALSE ); // repaint without erase
}
<a name="x1888"></a>void LifeWidget::<a href="qframe.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * e )
{
<a name="x1892"></a> int starti = pos2index( e-><a href="qpaintevent.html#rect">rect</a>().left() );
int stopi = pos2index( e-><a href="qpaintevent.html#rect">rect</a>().right() );
int startj = pos2index( e-><a href="qpaintevent.html#rect">rect</a>().top() );
int stopj = pos2index( e-><a href="qpaintevent.html#rect">rect</a>().bottom() );
if (stopi > maxi)
stopi = maxi;
if (stopj > maxj)
stopj = maxj;
<a href="qpainter.html">QPainter</a> paint( this );
for ( int i = starti; i <= stopi; i++ ) {
for ( int j = startj; j <= stopj; j++ ) {
if ( cells[current][i][j] )
<a href="qpainter.html#qDrawShadePanel">qDrawShadePanel</a>( &paint, index2pos( i ), index2pos( j ),
SCALE - 1, SCALE - 1, colorGroup() );
else if ( cells[!current][i][j] )
<a href="qwidget.html#erase">erase</a>(index2pos( i ), index2pos( j ), SCALE - 1, SCALE - 1);
}
}
<a href="qframe.html#drawFrame">drawFrame</a>( &paint );
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:37 $
**
** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for Qt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include "lifedlg.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
#include <stdlib.h>
void usage()
{
<a href="qapplication.html#qWarning">qWarning</a>( "Usage: life [-scale scale]" );
}
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
int scale = 10;
for ( int i = 1; i < argc; i++ ){
<a href="qstring.html">QString</a> arg = argv[i];
if ( arg == "-scale" )
scale = atoi( argv[++i] );
else {
usage();
exit(1);
}
}
if ( scale < 2 )
scale = 2;
LifeDialog *life = new LifeDialog( scale );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( life );
life-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Life");
life-><a href="qwidget.html#show">show</a>();
return a.<a href="qapplication.html#exec">exec</a>();
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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