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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"><title>
Qt Toolkit - aclock/main.cpp example file
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<h1 align=center>Analog Clock</h1><br clear="all">
This example displays an analog clock widget.
<hr>
Header file: <pre>/****************************************************************************
** $Id: qt/examples/aclock/aclock.h 2.3.2 edited 2001-01-26 $
**
** 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.
**
*****************************************************************************/
#ifndef ACLOCK_H
#define ACLOCK_H
#include <<a href="qwidget-h.html">qwidget.h</a>>
#include <<a href="qdatetime-h.html">qdatetime.h</a>>
class AnalogClock : public QWidget // analog clock widget
{
Q_OBJECT
public:
AnalogClock( <a href="qwidget.html">QWidget</a> *parent=0, const char *name=0 );
void setAutoMask(bool b);
protected:
void updateMask();
void paintEvent( <a href="qpaintevent.html">QPaintEvent</a> *);
private slots:
void drawClock( <a href="qpainter.html">QPainter</a>* );
void timeout();
private:
<a href="qtime.html">QTime</a> time;
};
#endif // ACLOCK_H
</pre>
<hr>
Implementation: <pre>/****************************************************************************
** $Id: qt/examples/aclock/aclock.cpp 2.3.2 edited 2001-01-26 $
**
** 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 "aclock.h"
#include <<a href="qtimer-h.html">qtimer.h</a>>
#include <<a href="qpainter-h.html">qpainter.h</a>>
#include <<a href="qbitmap-h.html">qbitmap.h</a>>
//
// Constructs an analog clock widget that uses an internal QTimer.
//
AnalogClock::AnalogClock( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
time = QTime::currentTime(); // get current time
<a href="qtimer.html">QTimer</a> *internalTimer = new <a href="qtimer.html">QTimer</a>( this ); // create internal timer
<a href="qobject.html#7f8e37">connect</a>( internalTimer, SIGNAL(<a href=#113>timeout</a>()), SLOT(<a href=#113>timeout</a>()) );
internalTimer-><a href="qtimer.html#ce33bc">start</a>( 5000 ); // emit signal every 5 seconds
}
//
// The QTimer::timeout() signal is received by this slot.
//
void <a name="113"></a>AnalogClock::timeout()
{
<a href="qtime.html">QTime</a> new_time = QTime::currentTime(); // get the current time
if ( new_time.<a href="qtime.html#83f0e2">minute</a>() != time.minute() ) { // minute has changed
if (autoMask())
<a href=#115>updateMask</a>();
else
<a href="qwidget.html#a66a88">update</a>();
}
}
void <a name="114"></a>AnalogClock::paintEvent( <a href="qpaintevent.html">QPaintEvent</a> * )
{
if ( autoMask() )
return;
<a href="qpainter.html">QPainter</a> paint( this );
paint.<a href="qpainter.html#3e0cc8">setBrush</a>( <a href="qwidget.html#d92bf4">colorGroup</a>().foreground() );
<a href=#116>drawClock</a>( &paint );
}
// If the clock is transparent, we use updateMask()
// instead of paintEvent()
void <a name="115"></a>AnalogClock::updateMask() // paint clock mask
{
<a href="qbitmap.html">QBitmap</a> bm( <a href="qwidget.html#50b75e">size</a>() );
bm.<a href="qpixmap.html#9167e5">fill</a>( color0 ); //transparent
<a href="qpainter.html">QPainter</a> paint;
paint.<a href="qpainter.html#02ed5d">begin</a>( &bm, this );
paint.<a href="qpainter.html#3e0cc8">setBrush</a>( color1 ); // use non-transparent color
paint.<a href="qpainter.html#0183e4">setPen</a>( color1 );
<a href=#116>drawClock</a>( &paint );
paint.<a href="qpainter.html#365784">end</a>();
<a href="qwidget.html#3aa0a1">setMask</a>( bm );
}
//
// The clock is painted using a 1000x1000 square coordinate system, in
// the a centered square, as big as possible. The painter's pen and
// brush colors are used.
//
void <a name="116"></a>AnalogClock::drawClock( <a href="qpainter.html">QPainter</a> *paint )
{
paint-><a href="qpainter.html#938d23">save</a>();
paint-><a href="qpainter.html#ad8b2b">setWindow</a>( -500,-500, 1000,1000 );
<a href="qrect.html">QRect</a> v = paint-><a href="qpainter.html#3ea58a">viewport</a>();
int d = QMIN( v.<a href="qrect.html#45fe95">width</a>(), v.<a href="qrect.html#581ab8">height</a>() );
paint-><a href="qpainter.html#42d67a">setViewport</a>( v.<a href="qrect.html#369cab">left</a>() + (v.<a href="qrect.html#45fe95">width</a>()-d)/2,
v.<a href="qrect.html#4dd27e">top</a>() + (v.<a href="qrect.html#581ab8">height</a>()-d)/2, d, d );
time = QTime::currentTime();
<a href="qpointarray.html">QPointArray</a> pts;
paint-><a href="qpainter.html#938d23">save</a>();
paint-><a href="qpainter.html#b5205c">rotate</a>( 30*(time.hour()%12-3) + time.minute()/2 );
pts.<a href="qpointarray.html#76de1d">setPoints</a>( 4, -20,0, 0,-20, 300,0, 0,20 );
paint-><a href="qpainter.html#2efe17">drawPolygon</a>( pts );
paint-><a href="qpainter.html#ddb3f4">restore</a>();
paint-><a href="qpainter.html#938d23">save</a>();
paint-><a href="qpainter.html#b5205c">rotate</a>( (time.minute()-15)*6 );
pts.<a href="qpointarray.html#76de1d">setPoints</a>( 4, -10,0, 0,-10, 400,0, 0,10 );
paint-><a href="qpainter.html#2efe17">drawPolygon</a>( pts );
paint-><a href="qpainter.html#ddb3f4">restore</a>();
for ( int i=0; i<12; i++ ) {
paint-><a href="qpainter.html#e3a489">drawLine</a>( 440,0, 460,0 );
paint-><a href="qpainter.html#b5205c">rotate</a>( 30 );
}
paint-><a href="qpainter.html#ddb3f4">restore</a>();
}
void <a name="117"></a>AnalogClock::setAutoMask(bool b)
{
if (b)
<a href="qwidget.html#e84bbe">setBackgroundMode</a>( PaletteForeground );
else
<a href="qwidget.html#e84bbe">setBackgroundMode</a>( PaletteBackground );
<a href="qwidget.html#efa8f9">QWidget::setAutoMask</a>(b);
}
</pre>
<hr>
Main:
<pre>/****************************************************************************
** $Id: qt/examples/aclock/main.cpp 2.3.2 edited 2001-06-12 $
**
** 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 "aclock.h"
#include <<a name="qapplication.h"></a><a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a name="QApplication"></a><a href="qapplication.html">QApplication</a> a( argc, argv );
AnalogClock *clock = new AnalogClock;
if ( argc == 2 && strcmp( argv[1], "-transparent" ) == 0 )
clock-><a name="setAutoMask"></a><a href="qwidget.html#efa8f9">setAutoMask</a>( TRUE );
clock-><a name="resize"></a><a href="qwidget.html#8fcbbe">resize</a>( 100, 100 );
a.<a name="setMainWidget"></a><a href="qapplication.html#7ad759">setMainWidget</a>( clock );
clock-><a name="setCaption"></a><a href="qwidget.html#d6a291">setCaption</a>("Qt Example - Analog Clock");
clock-><a name="show"></a><a href="qwidget.html#200ee5">show</a>();
int result = a.<a name="exec"></a><a href="qapplication.html#84c7bf">exec</a>();
delete clock;
return result;
}
</pre>
<p><address><hr><div align="center">
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<td>Copyright 2001 Trolltech<td><a href="http://www.trolltech.com/trademarks.html">Trademarks</a>
<td align="right"><div align="right">Qt version 2.3.2</div>
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