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/****************************************************************************
** $Id: aclock.cpp,v 1.2 1999/06/03 01:43:43 warwick Exp $
**
** Copyright (C) 1992-1999 Troll Tech 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 <qtimer.h>
#include <qpainter.h>
#include <qbitmap.h>
//
// Constructs an analog clock widget that uses an internal QTimer.
//
AnalogClock::AnalogClock( QWidget *parent, const char *name )
: QWidget( parent, name )
{
time = QTime::currentTime(); // get current time
QTimer *internalTimer = new QTimer( this ); // create internal timer
connect( internalTimer, SIGNAL(timeout()), SLOT(timeout()) );
internalTimer->start( 5000 ); // emit signal every 5 seconds
}
//
// The QTimer::timeout() signal is received by this slot.
//
void AnalogClock::timeout()
{
QTime new_time = QTime::currentTime(); // get the current time
if ( new_time.minute() != time.minute() ) // minute has changed
updateMask();
}
void AnalogClock::paintEvent( QPaintEvent * )
{
if ( autoMask() )
return;
QPainter paint( this );
paint.setBrush( colorGroup().foreground() );
drawClock( &paint );
}
// If the clock is transparent, we use updateMask()
// instead of paintEvent()
void AnalogClock::updateMask() // paint clock mask
{
QBitmap bm( size() );
bm.fill( color0 ); //transparent
QPainter paint;
paint.begin( &bm, this );
paint.setBrush( color1 ); // use non-transparent color
paint.setPen( color1 );
drawClock( &paint );
paint.end();
setMask( bm );
}
//
// The clock is painted using a 1000x1000 square coordinate system.
// The painter's pen and brush colors are used.
//
void AnalogClock::drawClock( QPainter *paint )
{
time = QTime::currentTime(); // save current time
QPointArray pts;
QPoint cp = rect().center(); // widget center point
int d = QMIN(width(),height()); // we want a circular clock
QWMatrix matrix; // setup transformation matrix
matrix.translate( cp.x(), cp.y() ); // origin at widget center
matrix.scale( d/1000.0F, d/1000.0F ); // scale coordinate system
float h_angle = 30*(time.hour()%12-3) + time.minute()/2;
matrix.rotate( h_angle ); // rotate to draw hour hand
paint->setWorldMatrix( matrix );
pts.setPoints( 4, -20,0, 0,-20, 300,0, 0,20 );
paint->drawPolygon( pts ); // draw hour hand
matrix.rotate( -h_angle ); // rotate back to zero
float m_angle = (time.minute()-15)*6;
matrix.rotate( m_angle ); // rotate to draw minute hand
paint->setWorldMatrix( matrix );
pts.setPoints( 4, -10,0, 0,-10, 400,0, 0,10 );
paint->drawPolygon( pts ); // draw minute hand
matrix.rotate( -m_angle ); // rotate back to zero
for ( int i=0; i<12; i++ ) { // draw hour lines
paint->setWorldMatrix( matrix );
paint->drawLine( 440,0, 460,0 );
matrix.rotate( 30 );
}
}
void AnalogClock::setAutoMask(bool b)
{
if (b)
setBackgroundMode( PaletteText );
else
setBackgroundMode( PaletteBackground );
QWidget::setAutoMask(b);
}
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