You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
tqt3/doc/html/forever-example.html

197 lines
6.9 KiB

<!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/forever/forever.doc:5 -->
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>A Rectangle Draw "Benchmark"</title>
<style type="text/css"><!--
fn { margin-left: 1cm; text-indent: -1cm; }
a:link { color: #004faf; text-decoration: none }
a:visited { color: #672967; text-decoration: none }
body { background: #ffffff; color: black; }
--></style>
</head>
<body>
<table border="0" cellpadding="0" cellspacing="0" width="100%">
<tr bgcolor="#E5E5E5">
<td valign=center>
<a href="index.html">
<font color="#004faf">Home</font></a>
| <a href="classes.html">
<font color="#004faf">All&nbsp;Classes</font></a>
| <a href="mainclasses.html">
<font color="#004faf">Main&nbsp;Classes</font></a>
| <a href="annotated.html">
<font color="#004faf">Annotated</font></a>
| <a href="groups.html">
<font color="#004faf">Grouped&nbsp;Classes</font></a>
| <a href="functions.html">
<font color="#004faf">Functions</font></a>
</td>
<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>A Rectangle Draw "Benchmark"</h1>
<p>
This example continuously draws rectangles in a window and
has another widget that counts the number of rectangles that
are drawn per second.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/forever.h 3.3.8 edited Jan 11 14:46 $
**
** Definition of something or other
**
** Created : 979899
**
** Copyright (C) 1997-2007 Trolltech ASA. All rights reserved.
**
** This file is part of an example program for TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#ifndef FOREVER_H
#define FOREVER_H
#include &lt;<a href="qwidget-h.html">ntqwidget.h</a>&gt;
const int numColors = 120;
class Forever : public <a href="ntqwidget.html">TQWidget</a>
{
<a href="metaobjects.html#TQ_OBJECT">TQ_OBJECT</a>
public:
Forever( <a href="ntqwidget.html">TQWidget</a> *parent=0, const char *name=0 );
protected:
void paintEvent( <a href="qpaintevent.html">TQPaintEvent</a> * );
void timerEvent( <a href="qtimerevent.html">TQTimerEvent</a> * );
private slots:
void updateCaption();
private:
int rectangles;
TQColor colors[numColors];
};
#endif
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/forever.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 TQt. This example
** program may be used, distributed and modified without limitation.
**
*****************************************************************************/
#include &lt;<a href="qtimer-h.html">ntqtimer.h</a>&gt;
#include &lt;<a href="qpainter-h.html">ntqpainter.h</a>&gt;
#include &lt;<a href="qapplication-h.html">ntqapplication.h</a>&gt;
#include &lt;stdlib.h&gt; // defines rand() function
#include "forever.h"
//
// Forever - a widget that draws rectangles forever.
//
//
// Constructs a Forever widget.
//
<a name="f365"></a>Forever::Forever( <a href="ntqwidget.html">TQWidget</a> *parent, const char *name )
: <a href="ntqwidget.html">TQWidget</a>( parent, name )
{
for (int a=0; a&lt;numColors; a++) {
colors[a] = TQColor( rand()&amp;255,
rand()&amp;255,
rand()&amp;255 );
}
rectangles = 0;
<a href="ntqobject.html#startTimer">startTimer</a>( 0 ); // run continuous timer
<a href="ntqtimer.html">TQTimer</a> * counter = new <a href="ntqtimer.html">TQTimer</a>( this );
<a name="x1054"></a> <a href="ntqobject.html#connect">connect</a>( counter, SIGNAL(<a href="ntqtimer.html#timeout">timeout</a>()),
this, SLOT(updateCaption()) );
<a name="x1053"></a> counter-&gt;<a href="ntqtimer.html#start">start</a>( 1000 );
}
void <a name="f366"></a>Forever::updateCaption()
{
<a href="ntqstring.html">TQString</a> s;
<a name="x1052"></a> s.<a href="ntqstring.html#sprintf">sprintf</a>( "TQt Example - Forever - %d rectangles/second", rectangles );
rectangles = 0;
<a href="ntqwidget.html#setCaption">setCaption</a>( s );
}
//
// Handles paint events for the Forever widget.
//
<a name="x1055"></a>void Forever::<a href="ntqwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">TQPaintEvent</a> * )
{
<a href="ntqpainter.html">TQPainter</a> paint( this ); // painter object
int w = <a href="ntqwidget.html#width">width</a>();
int h = <a href="ntqwidget.html#height">height</a>();
if(w &lt;= 0 || h &lt;= 0)
return;
paint.<a href="ntqpainter.html#setPen">setPen</a>( NoPen ); // do not draw outline
paint.<a href="ntqpainter.html#setBrush">setBrush</a>( colors[rand() % numColors]);// set random brush color
<a href="ntqpoint.html">TQPoint</a> p1( rand()%w, rand()%h ); // p1 = top left
<a href="ntqpoint.html">TQPoint</a> p2( rand()%w, rand()%h ); // p2 = bottom right
<a href="ntqrect.html">TQRect</a> r( p1, p2 );
paint.<a href="ntqpainter.html#drawRect">drawRect</a>( r ); // draw filled rectangle
}
//
// Handles timer events for the Forever widget.
//
<a name="x1048"></a>void Forever::<a href="ntqobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">TQTimerEvent</a> * )
{
for ( int i=0; i&lt;100; i++ ) {
<a href="ntqwidget.html#repaint">repaint</a>( FALSE ); // repaint, don't erase
rectangles++;
}
}
//
// Create and display Forever widget.
//
int main( int argc, char **argv )
{
<a href="ntqapplication.html">TQApplication</a> a( argc, argv ); // create application object
Forever always; // create widget
always.<a href="ntqwidget.html#resize">resize</a>( 400, 250 ); // start up with size 400x250
a.<a href="ntqapplication.html#setMainWidget">setMainWidget</a>( &amp;always ); // set as main widget
always.<a href="ntqwidget.html#setCaption">setCaption</a>("TQt Example - Forever");
always.<a href="ntqwidget.html#show">show</a>(); // show widget
return a.<a href="ntqapplication.html#exec">exec</a>(); // run event loop
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
<!-- eof -->
<p><address><hr><div align=center>
<table width=100% cellspacing=0 border=0><tr>
<td>Copyright &copy; 2007
<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
<td align=right><div align=right>TQt 3.3.8</div>
</table></div></address></body>
</html>