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197 lines
6.9 KiB
197 lines
6.9 KiB
14 years ago
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<!-- /home/espenr/tmp/qt-3.3.8-espenr-2499/qt-x11-free-3.3.8/examples/forever/forever.doc:5 -->
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>A Rectangle Draw "Benchmark"</title>
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<style type="text/css"><!--
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fn { margin-left: 1cm; text-indent: -1cm; }
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a:link { color: #004faf; text-decoration: none }
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a:visited { color: #672967; text-decoration: none }
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body { background: #ffffff; color: black; }
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--></style>
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</head>
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<body>
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<table border="0" cellpadding="0" cellspacing="0" width="100%">
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<tr bgcolor="#E5E5E5">
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<td valign=center>
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<a href="index.html">
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<font color="#004faf">Home</font></a>
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| <a href="classes.html">
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<font color="#004faf">All Classes</font></a>
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| <a href="mainclasses.html">
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<font color="#004faf">Main Classes</font></a>
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| <a href="annotated.html">
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<font color="#004faf">Annotated</font></a>
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| <a href="groups.html">
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<font color="#004faf">Grouped Classes</font></a>
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| <a href="functions.html">
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<font color="#004faf">Functions</font></a>
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</td>
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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>A Rectangle Draw "Benchmark"</h1>
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<p>
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This example continuously draws rectangles in a window and
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has another widget that counts the number of rectangles that
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are drawn per second.
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<p> <hr>
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<p> Header file:
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<p> <pre>/****************************************************************************
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** $Id: qt/forever.h 3.3.8 edited Jan 11 14:46 $
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**
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** Definition of something or other
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**
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** Created : 979899
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**
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** Copyright (C) 1997-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#ifndef FOREVER_H
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#define FOREVER_H
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#include <<a href="qwidget-h.html">qwidget.h</a>>
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const int numColors = 120;
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class Forever : public <a href="qwidget.html">QWidget</a>
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{
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<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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public:
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Forever( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
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protected:
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void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * );
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void timerEvent( <a href="qtimerevent.html">QTimerEvent</a> * );
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private slots:
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void updateCaption();
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private:
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int rectangles;
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QColor colors[numColors];
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};
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#endif
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</pre>
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<p> <hr>
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<p> Implementation:
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<p> <pre>/****************************************************************************
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** $Id: qt/forever.cpp 3.3.8 edited Jan 11 14:37 $
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**
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** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for Qt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include <<a href="qtimer-h.html">qtimer.h</a>>
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#include <<a href="qpainter-h.html">qpainter.h</a>>
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#include <<a href="qapplication-h.html">qapplication.h</a>>
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#include <stdlib.h> // defines rand() function
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#include "forever.h"
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//
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// Forever - a widget that draws rectangles forever.
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//
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//
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// Constructs a Forever widget.
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//
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<a name="f365"></a>Forever::Forever( <a href="qwidget.html">QWidget</a> *parent, const char *name )
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: <a href="qwidget.html">QWidget</a>( parent, name )
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{
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for (int a=0; a<numColors; a++) {
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colors[a] = QColor( rand()&255,
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rand()&255,
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rand()&255 );
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}
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rectangles = 0;
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<a href="qobject.html#startTimer">startTimer</a>( 0 ); // run continuous timer
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<a href="qtimer.html">QTimer</a> * counter = new <a href="qtimer.html">QTimer</a>( this );
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<a name="x1054"></a> <a href="qobject.html#connect">connect</a>( counter, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()),
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this, SLOT(updateCaption()) );
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<a name="x1053"></a> counter-><a href="qtimer.html#start">start</a>( 1000 );
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}
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void <a name="f366"></a>Forever::updateCaption()
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{
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<a href="qstring.html">QString</a> s;
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<a name="x1052"></a> s.<a href="qstring.html#sprintf">sprintf</a>( "Qt Example - Forever - %d rectangles/second", rectangles );
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rectangles = 0;
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<a href="qwidget.html#setCaption">setCaption</a>( s );
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}
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//
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// Handles paint events for the Forever widget.
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//
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<a name="x1055"></a>void Forever::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
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{
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<a href="qpainter.html">QPainter</a> paint( this ); // painter object
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int w = <a href="qwidget.html#width">width</a>();
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int h = <a href="qwidget.html#height">height</a>();
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if(w <= 0 || h <= 0)
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return;
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paint.<a href="qpainter.html#setPen">setPen</a>( NoPen ); // do not draw outline
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paint.<a href="qpainter.html#setBrush">setBrush</a>( colors[rand() % numColors]);// set random brush color
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<a href="qpoint.html">QPoint</a> p1( rand()%w, rand()%h ); // p1 = top left
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<a href="qpoint.html">QPoint</a> p2( rand()%w, rand()%h ); // p2 = bottom right
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<a href="qrect.html">QRect</a> r( p1, p2 );
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paint.<a href="qpainter.html#drawRect">drawRect</a>( r ); // draw filled rectangle
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}
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//
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// Handles timer events for the Forever widget.
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//
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<a name="x1048"></a>void Forever::<a href="qobject.html#timerEvent">timerEvent</a>( <a href="qtimerevent.html">QTimerEvent</a> * )
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{
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for ( int i=0; i<100; i++ ) {
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<a href="qwidget.html#repaint">repaint</a>( FALSE ); // repaint, don't erase
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rectangles++;
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}
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}
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//
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// Create and display Forever widget.
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//
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int main( int argc, char **argv )
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{
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<a href="qapplication.html">QApplication</a> a( argc, argv ); // create application object
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Forever always; // create widget
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always.<a href="qwidget.html#resize">resize</a>( 400, 250 ); // start up with size 400x250
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a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( &always ); // set as main widget
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always.<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Forever");
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always.<a href="qwidget.html#show">show</a>(); // show widget
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return a.<a href="qapplication.html#exec">exec</a>(); // run event loop
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}
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</pre>
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<p>See also <a href="examples.html">Examples</a>.
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<!-- eof -->
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<p><address><hr><div align=center>
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<table width=100% cellspacing=0 border=0><tr>
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<td>Copyright © 2007
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<a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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<td align=right><div align=right>Qt 3.3.8</div>
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</table></div></address></body>
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</html>
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