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<title>A Rectangle Draw "Benchmark"</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>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   3.0.2   edited Oct 12 12:18 $
**
** Definition of something or other
**
** Created : 979899
**
** Copyright (C) 1997 by Trolltech AS.  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   3.0.2   edited Oct 12 12:18 $
**
** Copyright (C) 1992-2000 Trolltech AS.  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="f425"></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="x1487"></a>    <a href="qobject.html#connect">connect</a>( counter, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()),
             this, SLOT(updateCaption()) );
<a name="x1486"></a>    counter-&gt;<a href="qtimer.html#start">start</a>( 1000 );
}


void <a name="f426"></a>Forever::updateCaption()
{
    <a href="qstring.html">QString</a> s;
<a name="x1485"></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.
//

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="x1481"></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
    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>.

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