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/**********************************************************************
** Copyright (C) 2003 Michael 'Mickey' Lauer. All rights reserved.
**
** This file is part of Wellenreiter II.
**
** This file may be distributed and/or modified under the terms of the
** GNU General Public License version 2 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
**********************************************************************/
#include "gps.h"
/* QT */
#include <qtextstream.h>
/* STD */
#include <stdlib.h>
#include <unistd.h>
GPS::GPS( QObject* parent, const char * name )
:QObject( parent, name )
{
qDebug( "GPS::GPS()" );
_socket = new QSocket( this, "gpsd commsock" );
}
GPS::~GPS()
{
qDebug( "GPS::~GPS()" );
}
bool GPS::open( const QString& host, int port )
{
_socket->connectToHost( host, port );
}
GpsLocation GPS::position() const
{
char buf[256];
double lat = -111.0;
double lon = -111.0;
int result = _socket->writeBlock( "p\r\n", 3 );
_socket->flush();
if ( result )
{
int numAvail = _socket->bytesAvailable();
qDebug( "GPS write succeeded, %d bytes available for reading...", numAvail );
if ( numAvail )
{
int numRead = _socket->readBlock( &buf[0], sizeof buf );
int numScan = ::sscanf( &buf[0], "GPSD,P=%lg %lg", &lat, &lon);
if ( numRead < 7 || numScan != 2 )
{
qDebug( "GPS read %d bytes succeeded, invalid response: '%s'", numRead, &buf[0] );
return GpsLocation( -111, -111 );
}
else
{
return GpsLocation( lat, lon );
}
}
}
return GpsLocation( -111, -111 );
}
QString GpsLocation::dmsPosition() const
{
if ( _latitude == -111 || _longitude == -111 )
return "N/A";
if ( _latitude == 0.0 && _longitude == 0.0 )
return "NULL";
/* compute latitude */
QString dms = "N";
if ( _latitude >= 0 ) dms.append( "+" );
int trunc = int( _latitude );
float rest = _latitude - trunc;
float minf = rest * 60;
int minutes = int( minf );
rest = minf - minutes;
int seconds = int( rest * 60 );
dms.append( QString::number( trunc ) );
dms.append( "° " );
dms.append( QString::number( ::abs( minutes ) ) );
dms.append( "' " );
dms.append( QString::number( ::abs( seconds ) ) );
dms.append( "'' " );
/* compute longitude */
dms.append( " | W" );
if ( _longitude > 0 ) dms.append( "+" );
trunc = int( _longitude );
rest = _longitude - trunc;
minf = rest * 60;
minutes = int( minf );
rest = minf - minutes;
seconds = int( rest * 60 );
dms.append( QString::number( trunc ) );
dms.append( "° " );
dms.append( QString::number( ::abs( minutes ) ) );
dms.append( "' " );
dms.append( QString::number( ::abs( seconds ) ) );
dms.append( "'' " );
return dms;
}
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