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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2011-07-10 15:24:15 -0500
commitbd0f3345a938b35ce6a12f6150373b0955b8dd12 (patch)
tree7a520322212d48ebcb9fbe1087e7fca28b76185c /doc/html/forever-example.html
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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/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>
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+<body>
+
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+<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 Qt. This example
+** program may be used, distributed and modified without limitation.
+**
+*****************************************************************************/
+
+#ifndef FOREVER_H
+#define FOREVER_H
+
+#include &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
+
+
+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 &lt;<a href="qtimer-h.html">qtimer.h</a>&gt;
+#include &lt;<a href="qpainter-h.html">qpainter.h</a>&gt;
+#include &lt;<a href="qapplication-h.html">qapplication.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="qwidget.html">QWidget</a> *parent, const char *name )
+ : <a href="qwidget.html">QWidget</a>( parent, name )
+{
+ for (int a=0; a&lt;numColors; a++) {
+ colors[a] = QColor( rand()&amp;255,
+ rand()&amp;255,
+ rand()&amp;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-&gt;<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 &lt;= 0 || h &lt;= 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&lt;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>( &amp;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 &copy; 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>