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RhumbSolve.cpp
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/**
* \file RhumbSolve.cpp
* \brief Command line utility for rhumb line calculations
*
* Copyright (c) Charles Karney (2014-2023) <karney@alum.mit.edu> and licensed
* under the MIT/X11 License. For more information, see
* https://geographiclib.sourceforge.io/
*
* See the <a href="RhumbSolve.1.html">man page</a> for usage information.
**********************************************************************/
#include <iostream>
#include <string>
#include <sstream>
#include <fstream>
#include <cmath>
#include <limits>
#include <GeographicLib/Rhumb.hpp>
#include <GeographicLib/DMS.hpp>
#include <GeographicLib/Utility.hpp>
#if defined(_MSC_VER)
// Squelch warnings about potentially uninitialized local variables
# pragma warning (disable: 4701)
#endif
#include "RhumbSolve.usage"
using namespace GeographicLib;
typedef Math::real real;
std::string LatLonString(real lat, real lon, int prec, bool dms, char dmssep,
bool longfirst) {
using namespace GeographicLib;
std::string
latstr = dms ? DMS::Encode(lat, prec + 5, DMS::LATITUDE, dmssep) :
DMS::Encode(lat, prec + 5, DMS::NUMBER),
lonstr = dms ? DMS::Encode(lon, prec + 5, DMS::LONGITUDE, dmssep) :
DMS::Encode(lon, prec + 5, DMS::NUMBER);
return
(longfirst ? lonstr : latstr) + " " + (longfirst ? latstr : lonstr);
}
std::string AzimuthString(real azi, int prec, bool dms, char dmssep) {
return dms ? DMS::Encode(azi, prec + 5, DMS::AZIMUTH, dmssep) :
DMS::Encode(azi, prec + 5, DMS::NUMBER);
}
int main(int argc, const char* const argv[]) {
try {
Utility::set_digits();
bool linecalc = false, inverse = false, dms = false, exact = false,
unroll = false, longfirst = false;
real
a = Constants::WGS84_a(),
f = Constants::WGS84_f();
real lat1, lon1, azi12 = Math::NaN(), lat2, lon2, s12, S12;
int prec = 3;
std::string istring, ifile, ofile, cdelim;
char lsep = ';', dmssep = char(0);
for (int m = 1; m < argc; ++m) {
std::string arg(argv[m]);
if (arg == "-i") {
inverse = true;
linecalc = false;
} else if (arg == "-L") {
inverse = false;
linecalc = true;
if (m + 3 >= argc) return usage(1, true);
try {
DMS::DecodeLatLon(std::string(argv[m + 1]), std::string(argv[m + 2]),
lat1, lon1, longfirst);
azi12 = DMS::DecodeAzimuth(std::string(argv[m + 3]));
}
catch (const std::exception& e) {
std::cerr << "Error decoding arguments of -L: " << e.what() << "\n";
return 1;
}
m += 3;
} else if (arg == "-e") {
if (m + 2 >= argc) return usage(1, true);
try {
a = Utility::val<real>(std::string(argv[m + 1]));
f = Utility::fract<real>(std::string(argv[m + 2]));
}
catch (const std::exception& e) {
std::cerr << "Error decoding arguments of -e: " << e.what() << "\n";
return 1;
}
m += 2;
} else if (arg == "-u")
unroll = true;
else if (arg == "-d") {
dms = true;
dmssep = '\0';
} else if (arg == "-:") {
dms = true;
dmssep = ':';
} else if (arg == "-w")
longfirst = !longfirst;
else if (arg == "-p") {
if (++m == argc) return usage(1, true);
try {
prec = Utility::val<int>(std::string(argv[m]));
}
catch (const std::exception&) {
std::cerr << "Precision " << argv[m] << " is not a number\n";
return 1;
}
} else if (arg == "-E")
exact = true;
else if (arg == "--input-string") {
if (++m == argc) return usage(1, true);
istring = argv[m];
} else if (arg == "--input-file") {
if (++m == argc) return usage(1, true);
ifile = argv[m];
} else if (arg == "--output-file") {
if (++m == argc) return usage(1, true);
ofile = argv[m];
} else if (arg == "--line-separator") {
if (++m == argc) return usage(1, true);
if (std::string(argv[m]).size() != 1) {
std::cerr << "Line separator must be a single character\n";
return 1;
}
lsep = argv[m][0];
} else if (arg == "--comment-delimiter") {
if (++m == argc) return usage(1, true);
cdelim = argv[m];
} else if (arg == "--version") {
std::cout << argv[0] << ": GeographicLib version "
<< GEOGRAPHICLIB_VERSION_STRING << "\n";
return 0;
} else
return usage(!(arg == "-h" || arg == "--help"), arg != "--help");
}
if (!ifile.empty() && !istring.empty()) {
std::cerr << "Cannot specify --input-string and --input-file together\n";
return 1;
}
if (ifile == "-") ifile.clear();
std::ifstream infile;
std::istringstream instring;
if (!ifile.empty()) {
infile.open(ifile.c_str());
if (!infile.is_open()) {
std::cerr << "Cannot open " << ifile << " for reading\n";
return 1;
}
} else if (!istring.empty()) {
std::string::size_type m = 0;
while (true) {
m = istring.find(lsep, m);
if (m == std::string::npos)
break;
istring[m] = '\n';
}
instring.str(istring);
}
std::istream* input = !ifile.empty() ? &infile :
(!istring.empty() ? &instring : &std::cin);
std::ofstream outfile;
if (ofile == "-") ofile.clear();
if (!ofile.empty()) {
outfile.open(ofile.c_str());
if (!outfile.is_open()) {
std::cerr << "Cannot open " << ofile << " for writing\n";
return 1;
}
}
std::ostream* output = !ofile.empty() ? &outfile : &std::cout;
const Rhumb rh(a, f, exact);
const RhumbLine rhl(linecalc ? rh.Line(lat1, lon1, azi12) :
rh.Line(0, 0, Math::qd));
// Max precision = 10: 0.1 nm in distance, 10^-15 deg (= 0.11 nm),
// 10^-11 sec (= 0.3 nm).
prec = std::min(10 + Math::extra_digits(), std::max(0, prec));
std::string s, eol, slat1, slon1, slat2, slon2, sazi, ss12, strc;
std::istringstream str;
int retval = 0;
while (std::getline(*input, s)) {
try {
eol = "\n";
if (!cdelim.empty()) {
std::string::size_type m = s.find(cdelim);
if (m != std::string::npos) {
eol = " " + s.substr(m) + "\n";
s = s.substr(0, m);
}
}
str.clear(); str.str(s);
if (linecalc) {
if (!(str >> ss12))
throw GeographicErr("Incomplete input: " + s);
if (str >> strc)
throw GeographicErr("Extraneous input: " + strc);
s12 = Utility::val<real>(ss12);
rhl.GenPosition(s12, Rhumb::ALL | (unroll ? Rhumb::LONG_UNROLL : 0),
lat2, lon2, S12);
*output << LatLonString(lat2, lon2, prec, dms, dmssep, longfirst)
<< " " << Utility::str(S12, std::max(prec-7, 0)) << eol;
} else if (inverse) {
if (!(str >> slat1 >> slon1 >> slat2 >> slon2))
throw GeographicErr("Incomplete input: " + s);
if (str >> strc)
throw GeographicErr("Extraneous input: " + strc);
DMS::DecodeLatLon(slat1, slon1, lat1, lon1, longfirst);
DMS::DecodeLatLon(slat2, slon2, lat2, lon2, longfirst);
rh.Inverse(lat1, lon1, lat2, lon2, s12, azi12, S12);
*output << AzimuthString(azi12, prec, dms, dmssep) << " "
<< Utility::str(s12, prec) << " "
<< Utility::str(S12, std::max(prec-7, 0)) << eol;
} else { // direct
if (!(str >> slat1 >> slon1 >> sazi >> ss12))
throw GeographicErr("Incomplete input: " + s);
if (str >> strc)
throw GeographicErr("Extraneous input: " + strc);
DMS::DecodeLatLon(slat1, slon1, lat1, lon1, longfirst);
azi12 = DMS::DecodeAzimuth(sazi);
s12 = Utility::val<real>(ss12);
rh.GenDirect(lat1, lon1, azi12, s12,
Rhumb::ALL | (unroll ? Rhumb::LONG_UNROLL : 0),
lat2, lon2, S12);
*output << LatLonString(lat2, lon2, prec, dms, dmssep, longfirst)
<< " " << Utility::str(S12, std::max(prec-7, 0)) << eol;
}
}
catch (const std::exception& e) {
// Write error message cout so output lines match input lines
*output << "ERROR: " << e.what() << "\n";
retval = 1;
}
}
return retval;
}
catch (const std::exception& e) {
std::cerr << "Caught exception: " << e.what() << "\n";
return 1;
}
catch (...) {
std::cerr << "Caught unknown exception\n";
return 1;
}
}
DMS.hpp
Header for GeographicLib::DMS class.
usage
int usage(int retval, bool)
Definition Geod3ODE.cpp:41
real
GeographicLib::Math::real real
Definition Geod3Solve.cpp:25
main
int main(int argc, const char *const argv[])
Definition RhumbSolve.cpp:48
AzimuthString
std::string AzimuthString(real azi, int prec, bool dms, char dmssep)
Definition RhumbSolve.cpp:43
LatLonString
std::string LatLonString(real lat, real lon, int prec, bool dms, char dmssep, bool longfirst)
Definition RhumbSolve.cpp:31
Rhumb.hpp
Header for GeographicLib::Rhumb and GeographicLib::RhumbLine classes.
Utility.hpp
Header for GeographicLib::Utility class.
GeographicLib::Constants::WGS84_f
static T WGS84_f()
Definition Constants.hpp:118
GeographicLib::Constants::WGS84_a
static T WGS84_a()
Definition Constants.hpp:112
GeographicLib::DMS::DecodeAzimuth
static Math::real DecodeAzimuth(const std::string &azistr)
Definition DMS.cpp:413
GeographicLib::DMS::LONGITUDE
@ LONGITUDE
Definition DMS.hpp:56
GeographicLib::DMS::NUMBER
@ NUMBER
Definition DMS.hpp:67
GeographicLib::DMS::LATITUDE
@ LATITUDE
Definition DMS.hpp:51
GeographicLib::DMS::AZIMUTH
@ AZIMUTH
Definition DMS.hpp:62
GeographicLib::DMS::Encode
static std::string Encode(real angle, component trailing, unsigned prec, flag ind=NONE, char dmssep=char(0))
Definition DMS.cpp:422
GeographicLib::DMS::DecodeLatLon
static void DecodeLatLon(const std::string &dmsa, const std::string &dmsb, real &lat, real &lon, bool longfirst=false)
Definition DMS.cpp:374
GeographicLib::GeographicErr
Exception handling for GeographicLib.
Definition Constants.hpp:344
GeographicLib::Math::qd
static constexpr int qd
degrees per quarter turn
Definition Math.hpp:142
GeographicLib::Math::NaN
static T NaN()
Definition Math.cpp:301
GeographicLib::Math::real
double real
Definition Math.hpp:115
GeographicLib::Math::extra_digits
static int extra_digits()
Definition Math.cpp:49
GeographicLib::RhumbLine
Find a sequence of points on a single rhumb line.
Definition Rhumb.hpp:382
GeographicLib::RhumbLine::GenPosition
void GenPosition(real s12, unsigned outmask, real &lat2, real &lon2, real &S12) const
Definition Rhumb.cpp:282
GeographicLib::Rhumb
Solve of the direct and inverse rhumb problems.
Definition Rhumb.hpp:80
GeographicLib::Rhumb::ALL
@ ALL
Definition Rhumb.hpp:162
GeographicLib::Rhumb::LONG_UNROLL
@ LONG_UNROLL
Definition Rhumb.hpp:157
GeographicLib::Rhumb::Line
RhumbLine Line(real lat1, real lon1, real azi12) const
Definition Rhumb.cpp:239
GeographicLib::Rhumb::Inverse
void Inverse(real lat1, real lon1, real lat2, real lon2, real &s12, real &azi12, real &S12) const
Definition Rhumb.hpp:268
GeographicLib::Utility::fract
static T fract(const std::string &s)
Definition Utility.hpp:298
GeographicLib::Utility::val
static T val(const std::string &s)
Definition Utility.hpp:225
GeographicLib::Utility::set_digits
static int set_digits(int ndigits=0)
Definition Utility.cpp:184
GeographicLib::Utility::str
static std::string str(T x, int p=-1)
Definition Utility.hpp:161
GeographicLib
Namespace for GeographicLib.
Definition Accumulator.cpp:12