diff options
| author | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
|---|---|---|
| committer | Timothy Pearson <kb9vqf@pearsoncomputing.net> | 2011-07-10 15:24:15 -0500 |
| commit | bd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch) | |
| tree | 7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/forever-example.html | |
| download | qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.tar.gz qt3-bd0f3345a938b35ce6a12f6150373b0955b8dd12.zip | |
Add Qt3 development HEAD version
Diffstat (limited to 'doc/html/forever-example.html')
| -rw-r--r-- | doc/html/forever-example.html | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/doc/html/forever-example.html b/doc/html/forever-example.html new file mode 100644 index 0000000..ceeaa99 --- /dev/null +++ b/doc/html/forever-example.html @@ -0,0 +1,196 @@ +<!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 Classes</font></a> + | <a href="mainclasses.html"> +<font color="#004faf">Main Classes</font></a> + | <a href="annotated.html"> +<font color="#004faf">Annotated</font></a> + | <a href="groups.html"> +<font color="#004faf">Grouped 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 Qt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +#ifndef FOREVER_H +#define FOREVER_H + +#include <<a href="qwidget-h.html">qwidget.h</a>> + + +const int numColors = 120; + + +class Forever : public <a href="qwidget.html">QWidget</a> +{ + <a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a> +public: + Forever( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 ); +protected: + void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * ); + void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * ); +private slots: + void updateCaption(); +private: + int rectangles; + QColor 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 Qt. This example +** program may be used, distributed and modified without limitation. +** +*****************************************************************************/ + +#include <<a href="qtimer-h.html">qtimer.h</a>> +#include <<a href="qpainter-h.html">qpainter.h</a>> +#include <<a href="qapplication-h.html">qapplication.h</a>> +#include <stdlib.h> // 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="qwidget.html">QWidget</a> *parent, const char *name ) + : <a href="qwidget.html">QWidget</a>( parent, name ) +{ + for (int a=0; a<numColors; a++) { + colors[a] = QColor( rand()&255, + rand()&255, + rand()&255 ); + } + rectangles = 0; + <a href="qobject.html#startTimer">startTimer</a>( 0 ); // run continuous timer + <a href="qtimer.html">QTimer</a> * counter = new <a href="qtimer.html">QTimer</a>( this ); +<a name="x1054"></a> <a href="qobject.html#connect">connect</a>( counter, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()), + this, SLOT(updateCaption()) ); +<a name="x1053"></a> counter-><a href="qtimer.html#start">start</a>( 1000 ); +} + + +void <a name="f366"></a>Forever::updateCaption() +{ + <a href="qstring.html">QString</a> s; +<a name="x1052"></a> s.<a href="qstring.html#sprintf">sprintf</a>( "Qt Example - Forever - %d rectangles/second", rectangles ); + rectangles = 0; + <a href="qwidget.html#setCaption">setCaption</a>( s ); +} + + +// +// Handles paint events for the Forever widget. +// + +<a name="x1055"></a>void Forever::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * ) +{ + <a href="qpainter.html">QPainter</a> paint( this ); // painter object + int w = <a href="qwidget.html#width">width</a>(); + int h = <a href="qwidget.html#height">height</a>(); + if(w <= 0 || h <= 0) + return; + paint.<a href="qpainter.html#setPen">setPen</a>( NoPen ); // do not draw outline + paint.<a href="qpainter.html#setBrush">setBrush</a>( colors[rand() % numColors]);// set random brush color + + <a href="qpoint.html">QPoint</a> p1( rand()%w, rand()%h ); // p1 = top left + <a href="qpoint.html">QPoint</a> p2( rand()%w, rand()%h ); // p2 = bottom right + + <a href="qrect.html">QRect</a> r( p1, p2 ); + paint.<a href="qpainter.html#drawRect">drawRect</a>( r ); // draw filled rectangle +} + +// +// Handles timer events for the Forever widget. +// + +<a name="x1048"></a>void Forever::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> * ) +{ + for ( int i=0; i<100; i++ ) { + <a href="qwidget.html#repaint">repaint</a>( FALSE ); // repaint, don't erase + rectangles++; + } +} + + +// +// Create and display Forever widget. +// + +int main( int argc, char **argv ) +{ + <a href="qapplication.html">QApplication</a> a( argc, argv ); // create application object + Forever always; // create widget + always.<a href="qwidget.html#resize">resize</a>( 400, 250 ); // start up with size 400x250 + a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &always ); // set as main widget + always.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Forever"); + always.<a href="qwidget.html#show">show</a>(); // show widget + return a.<a href="qapplication.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 © 2007 +<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a> +<td align=right><div align=right>Qt 3.3.8</div> +</table></div></address></body> +</html> |