Tom Early
6 years ago
parent
34be899f58
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9450d7d153
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/*
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* Copyright (C) 2020 by Thomas Early N7TAE
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <string>
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#include <regex>
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#include <cmath>
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#include <iostream>
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#include "Utilities.h"
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#include "Location.h"
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CLocation::CLocation()
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{
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crc = std::regex("^.*([0-9]{2})([0-9]{2}\\.[0-9]{2,})([NS])/([0-9]{3})([0-9]{2}\\.[0-9]{1,})([WE])\\[.*$", std::regex::extended);
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rmc = std::regex("^.*,([0-9]{2})([0-9]{2}\\.[0-9]{2,}),([NS]),([0-9]{3})([0-9]{2}\\.[0-9]{1,}),([WE]),.*$", std::regex::extended);
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}
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// returns true on success
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bool CLocation::Parse(const char *instr)
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{
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std::string s(instr);
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std::cmatch cm;
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trim(s);
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if (0 == s.find("$$CRC")) {
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std::regex_match(s.c_str(), cm, crc, std::regex_constants::match_default);
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} else if ((0 == s.find("$GPGGA")) || (0 == s.find("$GPRMC"))) {
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std::regex_match(s.c_str(), cm, rmc, std::regex_constants::match_default);
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} else {
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if ('$' == s.at(0))
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std::cerr << "can't parse GPS string: " << s << std::endl;
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return false;
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}
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auto size = cm.size();
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if (size != 7) {
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std::cerr << "Bad CRC Match for " << s << ":";
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for (unsigned i=0; i<size; i++)
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std::cerr << " [" << cm[i] << "]";
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std::cerr << std::endl;
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return false;
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}
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double deg = stod(cm[1]);
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if (90.0 < deg) {
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std::cout << "Latitude degree " << deg << " is out of range" << std::endl;
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return false;
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}
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double min = stod(cm[2]);
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if (60.0 < min) {
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std::cout << "Latitude minutes " << min << " is out of range" << std::endl;
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return false;
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}
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latitude = deg + min / 60.0;
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if ('S' == cm[3])
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latitude = 0 - latitude;
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deg = stod(cm[4]);
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if (180.0 < deg) {
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std::cout << "Longitude degree " << deg << " is out of range" << std::endl;
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return false;
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}
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min = stod(cm[5]);
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if (60.0 < min) {
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std::cout << "Longitude minutes " << min << " is out of range" << std::endl;
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return false;
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}
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longitude = deg + min / 60.0;
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if ('W' == cm[6])
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longitude = 0 - longitude;
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double lat = latitude + 90.0;
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double lon = longitude + 180.0;
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maidenhead[0] = 'A' + (int(lon) / 20);
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maidenhead[1] = 'A' + (int(lat) / 10);
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maidenhead[2] = '0' + ((int(lon) % 20) / 2);
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maidenhead[3] = '0' + (int(lat) % 10);
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maidenhead[4] = 'a' + (int(lon * 12.0) % 24);
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maidenhead[5] = 'a' + (int(lat * 24.0) % 24);
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maidenhead[6] = '\0';
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return true;
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}
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double CLocation::Latitude() const
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{
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return latitude;
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}
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double CLocation::Longitude() const
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{
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return longitude;
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}
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const char* CLocation::MaidenHead() const
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{
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return maidenhead;
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}
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@ -0,0 +1,33 @@
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#pragma once
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/*
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* Copyright (C) 2020 by Thomas Early N7TAE
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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class CLocation
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{
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public:
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CLocation();
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bool Parse(const char *instr);
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double Latitude() const;
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double Longitude() const;
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const char* MaidenHead() const;
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private:
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char maidenhead[7];
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double latitude, longitude;
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std::regex crc, rmc;
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};
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