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sdrangel/sdrbase/util/maidenhead.cpp

89 lines
3.6 KiB
C++

///////////////////////////////////////////////////////////////////////////////////
// Copyright (C) 2021 Jon Beniston, M7RCE <jon@beniston.com> //
// //
// Maidenhead locator utilities //
// //
// This program is free software; you can redistribute it and/or modify //
// it under the terms of the GNU General Public License as published by //
// the Free Software Foundation as version 3 of the License, or //
// (at your option) any later version. //
// //
// This program is distributed in the hope that it will be useful, //
// but WITHOUT ANY WARRANTY; without even the implied warranty of //
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
// GNU General Public License V3 for more details. //
// //
// You should have received a copy of the GNU General Public License //
// along with this program. If not, see <http://www.gnu.org/licenses/>. //
///////////////////////////////////////////////////////////////////////////////////
#include <cmath>
#include <QRegExp>
#include "maidenhead.h"
// See: https://en.wikipedia.org/wiki/Maidenhead_Locator_System
QString Maidenhead::toMaidenhead(float latitude, float longitude)
{
longitude += 180.0;
latitude += 90.0;
int lon1 = floor(longitude/20);
longitude -= lon1*20;
int lat1 = floor(latitude/10);
latitude -= lat1*10;
int lon2 = floor(longitude/2);
longitude -= lon2*2;
int lat2 = floor(latitude/1);
latitude -= lat2;
int lon3 = round(longitude*12);
int lat3 = round(latitude*24);
return QString("%1%2%3%4%5%6").arg(QChar(lon1+'A')).arg(QChar(lat1+'A'))
.arg(QChar(lon2+'0')).arg(QChar(lat2+'0'))
.arg(QChar(lon3+'A')).arg(QChar(lat3+'A'));
}
bool Maidenhead::fromMaidenhead(const QString& maidenhead, float& latitude, float& longitude)
{
if (Maidenhead::isMaidenhead(maidenhead))
{
int lon1 = maidenhead[0].toUpper().toLatin1() - 'A';
int lat1 = maidenhead[1].toUpper().toLatin1() - 'A';
int lon2 = maidenhead[2].toLatin1() - '0';
int lat2 = maidenhead[3].toLatin1() - '0';
int lon3 = 0;
int lat3 = 0;
int lon4 = 0;
int lat4 = 0;
if (maidenhead.length() >= 6)
{
lon3 = maidenhead[4].toUpper().toLatin1() - 'A';
lat3 = maidenhead[5].toUpper().toLatin1() - 'A';
}
if (maidenhead.length() == 8)
{
lon4 = maidenhead[6].toLatin1() - '0';
lat4 = maidenhead[7].toLatin1() - '0';
}
longitude = lon1 * 20 + lon2 * 2 + lon3 * 2.0/24.0 + lon4 * 2.0/24.0/10; // 20=360/18
latitude = lat1 * 10 + lat2 * 1 + lat3 * 1.0/24.0 + lat4 * 1.0/24.0/10; // 10=180/18
longitude -= 180.0;
latitude -= 90.0;
return true;
}
else
return false;
}
bool Maidenhead::isMaidenhead(const QString& maidenhead)
{
int length = maidenhead.length();
if ((length != 4) && (length != 6) && (length != 8))
return false;
QRegExp re("[A-Ra-r][A-Ra-r][0-9][0-9]([A-Xa-x][A-Xa-x]([0-9][0-9])?)?");
return re.exactMatch(maidenhead);
}