/usr/share/qt3/doc/html/aclock-example.html

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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 &lt;<a href="qwidget-h.html">qwidget.h</a>&gt;
#include &lt;<a href="qdatetime-h.html">qdatetime.h</a>&gt;

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> &amp; 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 &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="qbitmap-h.html">qbitmap.h</a>&gt;

//
// 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-&gt;<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-&gt;<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-&gt;<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> &amp; 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( &amp;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>( &amp;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( &amp;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-&gt;<a href="qpainter.html#save">save</a>();

<a name="x1193"></a>    paint-&gt;<a href="qpainter.html#setWindow">setWindow</a>( -500,-500, 1000,1000 );

<a name="x1194"></a>    <a href="qrect.html">QRect</a> v = paint-&gt;<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-&gt;<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-&gt;<a href="qpainter.html#save">save</a>();
<a name="x1188"></a>    paint-&gt;<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-&gt;<a href="qpainter.html#drawConvexPolygon">drawConvexPolygon</a>( pts );
<a name="x1187"></a>    paint-&gt;<a href="qpainter.html#restore">restore</a>();

    paint-&gt;<a href="qpainter.html#save">save</a>();
    paint-&gt;<a href="qpainter.html#rotate">rotate</a>( (time.minute()-15)*6 );
    pts.setPoints( 4, -10,0, 0,-10, 400,0, 0,10 );
    paint-&gt;<a href="qpainter.html#drawConvexPolygon">drawConvexPolygon</a>( pts );
    paint-&gt;<a href="qpainter.html#restore">restore</a>();

    for ( int i=0; i&lt;12; i++ ) {
<a name="x1185"></a>        paint-&gt;<a href="qpainter.html#drawLine">drawLine</a>( 440,0, 460,0 );
        paint-&gt;<a href="qpainter.html#rotate">rotate</a>( 30 );
    }

    paint-&gt;<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 &lt;<a href="qapplication-h.html">qapplication.h</a>&gt;


int main( int argc, char **argv )
{
    <a href="qapplication.html">QApplication</a> a( argc, argv );
    AnalogClock *clock = new AnalogClock;
    if ( argc == 2 &amp;&amp; strcmp( argv[1], "-transparent" ) == 0 )
<a name="x1213"></a>        clock-&gt;<a href="qwidget.html#setAutoMask">setAutoMask</a>( TRUE );
<a name="x1212"></a>    clock-&gt;<a href="qwidget.html#resize">resize</a>( 100, 100 );
    a.<a href="qapplication.html#setMainWidget">setMainWidget</a>( clock );
<a name="x1214"></a>    clock-&gt;<a href="qwidget.html#setCaption">setCaption</a>("Qt Example - Analog Clock");
<a name="x1215"></a>    clock-&gt;<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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