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<title>Analog Clock</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>Analog Clock</h1>
<p>
This example displays an analog clock widget.
<p> <hr>
<p> Header file:
<p> <pre>/****************************************************************************
** $Id: qt/aclock.h 3.3.8 edited Jan 11 14:36 $
**
** 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.
**
*****************************************************************************/
#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 QTimer;
class AnalogClock : public <a href="qwidget.html">QWidget</a> // analog clock widget
{
<a href="metaobjects.html#Q_OBJECT">Q_OBJECT</a>
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> *);
void mousePressEvent( <a href="qmouseevent.html">QMouseEvent</a> *);
void mouseMoveEvent( <a href="qmouseevent.html">QMouseEvent</a> *);
void drawClock( <a href="qpainter.html">QPainter</a>* );
private slots:
void timeout();
public slots:
void setTime( const <a href="qtime.html">QTime</a> & t );
private:
<a href="qpoint.html">QPoint</a> clickPos;
<a href="qtime.html">QTime</a> time;
<a href="qtimer.html">QTimer</a> *internalTimer;
};
#endif // ACLOCK_H
</pre>
<p> <hr>
<p> Implementation:
<p> <pre>/****************************************************************************
** $Id: qt/aclock.cpp 3.3.8 edited Jan 11 14:36 $
**
** 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 "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.
//
<a name="f384"></a>AnalogClock::AnalogClock( <a href="qwidget.html">QWidget</a> *parent, const char *name )
: <a href="qwidget.html">QWidget</a>( parent, name )
{
<a name="x1201"></a> time = QTime::<a href="qtime.html#currentTime">currentTime</a>(); // get current time
internalTimer = new <a href="qtimer.html">QTimer</a>( this ); // create internal timer
<a name="x1205"></a> <a href="qobject.html#connect">connect</a>( internalTimer, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()), SLOT(timeout()) );
<a name="x1204"></a> internalTimer-><a href="qtimer.html#start">start</a>( 5000 ); // emit signal every 5 seconds
}
void AnalogClock::<a href="qwidget.html#mousePressEvent">mousePressEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
if(<a href="qwidget.html#isTopLevel">isTopLevel</a>())
clickPos = e-><a href="qmouseevent.html#pos">pos</a>() + QPoint(<a href="qwidget.html#geometry">geometry</a>().topLeft() - frameGeometry().topLeft());
}
<a name="x1206"></a>void AnalogClock::<a href="qwidget.html#mouseMoveEvent">mouseMoveEvent</a>( <a href="qmouseevent.html">QMouseEvent</a> *e )
{
if(<a href="qwidget.html#isTopLevel">isTopLevel</a>())
<a name="x1181"></a> <a href="qwidget.html#move">move</a>( e-><a href="qmouseevent.html#globalPos">globalPos</a>() - clickPos );
}
//
// The QTimer::timeout() signal is received by this slot.
//
//
// When we set an explicit time we don't want the timeout() slot to be
// called anymore as this relies on currentTime()
//
void <a name="f385"></a>AnalogClock::setTime( const <a href="qtime.html">QTime</a> & t )
{
time = t;
<a href="qobject.html#disconnect">disconnect</a>( internalTimer, SIGNAL(<a href="qtimer.html#timeout">timeout</a>()), this, SLOT(timeout()) );
if (<a href="qwidget.html#autoMask">autoMask</a>())
<a href="qwidget.html#updateMask">updateMask</a>();
else
<a href="qwidget.html#update">update</a>();
}
void <a name="f386"></a>AnalogClock::timeout()
{
<a href="qtime.html">QTime</a> old_time = time;
time = QTime::<a href="qtime.html#currentTime">currentTime</a>();
<a name="x1203"></a> if ( old_time.<a href="qtime.html#minute">minute</a>() != time.minute()
<a name="x1202"></a> || old_time.<a href="qtime.html#hour">hour</a>() != time.hour() ) { // minute or hour has changed
if (<a href="qwidget.html#autoMask">autoMask</a>())
<a href="qwidget.html#updateMask">updateMask</a>();
else
<a href="qwidget.html#update">update</a>();
}
}
void AnalogClock::<a href="qwidget.html#paintEvent">paintEvent</a>( <a href="qpaintevent.html">QPaintEvent</a> * )
{
if ( <a href="qwidget.html#autoMask">autoMask</a>() )
return;
<a href="qpainter.html">QPainter</a> paint( this );
<a name="x1190"></a> paint.<a href="qpainter.html#setBrush">setBrush</a>( <a href="qwidget.html#colorGroup">colorGroup</a>().foreground() );
drawClock( &paint );
}
// If the clock is transparent, we use updateMask()
// instead of paintEvent()
void AnalogClock::updateMask() // paint clock mask
{
<a href="qbitmap.html">QBitmap</a> bm( <a href="qwidget.html#size">size</a>() );
bm.<a href="qpixmap.html#fill">fill</a>( color0 ); //transparent
<a href="qpainter.html">QPainter</a> paint;
<a name="x1183"></a> paint.<a href="qpainter.html#begin">begin</a>( &bm, this );
paint.<a href="qpainter.html#setBrush">setBrush</a>( color1 ); // use non-transparent color
paint.<a href="qpainter.html#setPen">setPen</a>( color1 );
drawClock( &paint );
<a name="x1186"></a> paint.<a href="qpainter.html#end">end</a>();
<a href="qwidget.html#setMask">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="f387"></a>AnalogClock::drawClock( <a href="qpainter.html">QPainter</a> *paint )
{
<a name="x1189"></a> paint-><a href="qpainter.html#save">save</a>();
<a name="x1193"></a> paint-><a href="qpainter.html#setWindow">setWindow</a>( -500,-500, 1000,1000 );
<a name="x1194"></a> <a href="qrect.html">QRect</a> v = paint-><a href="qpainter.html#viewport">viewport</a>();
int d = QMIN( v.<a href="qrect.html#width">width</a>(), v.<a href="qrect.html#height">height</a>() );
<a name="x1198"></a><a name="x1192"></a> paint-><a href="qpainter.html#setViewport">setViewport</a>( v.<a href="qrect.html#left">left</a>() + (v.<a href="qrect.html#width">width</a>()-d)/2,
<a name="x1199"></a> v.<a href="qrect.html#top">top</a>() + (v.<a href="qrect.html#height">height</a>()-d)/2, d, d );
<a href="qpointarray.html">QPointArray</a> pts;
paint-><a href="qpainter.html#save">save</a>();
<a name="x1188"></a> paint-><a href="qpainter.html#rotate">rotate</a>( 30*(time.hour()%12-3) + time.minute()/2 );
<a name="x1196"></a> pts.setPoints( 4, -20,0, 0,-20, 300,0, 0,20 );
<a name="x1184"></a> paint-><a href="qpainter.html#drawConvexPolygon">drawConvexPolygon</a>( pts );
<a name="x1187"></a> paint-><a href="qpainter.html#restore">restore</a>();
paint-><a href="qpainter.html#save">save</a>();
paint-><a href="qpainter.html#rotate">rotate</a>( (time.minute()-15)*6 );
pts.setPoints( 4, -10,0, 0,-10, 400,0, 0,10 );
paint-><a href="qpainter.html#drawConvexPolygon">drawConvexPolygon</a>( pts );
paint-><a href="qpainter.html#restore">restore</a>();
for ( int i=0; i<12; i++ ) {
<a name="x1185"></a> paint-><a href="qpainter.html#drawLine">drawLine</a>( 440,0, 460,0 );
paint-><a href="qpainter.html#rotate">rotate</a>( 30 );
}
paint-><a href="qpainter.html#restore">restore</a>();
}
<a name="x1209"></a>void AnalogClock::<a href="qwidget.html#setAutoMask">setAutoMask</a>(bool b)
{
if (b)
<a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>( PaletteForeground );
else
<a href="qwidget.html#setBackgroundMode">setBackgroundMode</a>( PaletteBackground );
QWidget::<a href="qwidget.html#setAutoMask">setAutoMask</a>(b);
}
</pre>
<p> <hr>
<p> Main:
<p> <pre>/****************************************************************************
** $Id: qt/main.cpp 3.3.8 edited Jan 11 14:36 $
**
** 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 "aclock.h"
#include <<a href="qapplication-h.html">qapplication.h</a>>
int main( int argc, char **argv )
{
<a href="qapplication.html">QApplication</a> a( argc, argv );
AnalogClock *clock = new AnalogClock;
if ( argc == 2 && strcmp( argv[1], "-transparent" ) == 0 )
<a name="x1213"></a> clock-><a href="qwidget.html#setAutoMask">setAutoMask</a>( TRUE );
<a name="x1212"></a> clock-><a href="qwidget.html#resize">resize</a>( 100, 100 );
a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock );
<a name="x1214"></a> clock-><a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Analog Clock");
<a name="x1215"></a> clock-><a href="qwidget.html#show">show</a>();
int result = a.<a href="qapplication.html#exec">exec</a>();
delete clock;
return result;
}
</pre>
<p>See also <a href="examples.html">Examples</a>.
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