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QG4/src/Geo/Constants.hpp

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/**
* \file Constants.hpp
* \brief Header for GeographicLib::Constants class
*
* Copyright (c) Charles Karney (2008-2019) <charles@karney.com> and licensed
* under the MIT/X11 License. For more information, see
* https://geographiclib.sourceforge.io/
**********************************************************************/
#pragma once
// This will be overwritten by ./configure
#define GEOGRAPHICLIB_VERSION_STRING "1.50"
#define GEOGRAPHICLIB_VERSION_MAJOR 1
#define GEOGRAPHICLIB_VERSION_MINOR 50
#define GEOGRAPHICLIB_VERSION_PATCH 0
// Undefine HAVE_LONG_DOUBLE if this type is unknown to the compiler
#define GEOGRAPHICLIB_HAVE_LONG_DOUBLE 1
// Define WORDS_BIGENDIAN to be 1 if your machine is big endian
/* #undef WORDS_BIGENDIAN */
#include "Math.hpp"
/**
* @relates GeographicLib::Constants
* Pack the version components into a single integer. Users should not rely on
* this particular packing of the components of the version number; see the
* documentation for GEOGRAPHICLIB_VERSION, below.
**********************************************************************/
#define GEOGRAPHICLIB_VERSION_NUM(a,b,c) ((((a) * 10000 + (b)) * 100) + (c))
/**
* @relates GeographicLib::Constants
* The version of GeographicLib as a single integer, packed as MMmmmmpp where
* MM is the major version, mmmm is the minor version, and pp is the patch
* level. Users should not rely on this particular packing of the components
* of the version number. Instead they should use a test such as \code
#if GEOGRAPHICLIB_VERSION >= GEOGRAPHICLIB_VERSION_NUM(1,37,0)
...
#endif
* \endcode
**********************************************************************/
#define GEOGRAPHICLIB_VERSION \
GEOGRAPHICLIB_VERSION_NUM(GEOGRAPHICLIB_VERSION_MAJOR, \
GEOGRAPHICLIB_VERSION_MINOR, \
GEOGRAPHICLIB_VERSION_PATCH)
/**
* @relates GeographicLib::Constants
* Is the C++11 static_assert available?
**********************************************************************/
#if !defined(GEOGRAPHICLIB_HAS_STATIC_ASSERT)
# if __cplusplus >= 201103 || defined(__GXX_EXPERIMENTAL_CXX0X__)
# define GEOGRAPHICLIB_HAS_STATIC_ASSERT 1
# elif defined(_MSC_VER) && _MSC_VER >= 1600
// For reference, here is a table of Visual Studio and _MSC_VER
// correspondences:
//
// _MSC_VER Visual Studio
// 1100 vc5
// 1200 vc6
// 1300 vc7
// 1310 vc7.1 (2003)
// 1400 vc8 (2005)
// 1500 vc9 (2008)
// 1600 vc10 (2010)
// 1700 vc11 (2012)
// 1800 vc12 (2013) First version of VS to include enough C++11 support
// 1900 vc14 (2015)
// 191[0-9] vc15 (2017)
// 192[0-9] vc16 (2019)
# define GEOGRAPHICLIB_HAS_STATIC_ASSERT 1
# else
# define GEOGRAPHICLIB_HAS_STATIC_ASSERT 0
# endif
#endif
/**
* @relates GeographicLib::Constants
* A compile-time assert. Use C++11 static_assert, if available.
**********************************************************************/
#if !defined(GEOGRAPHICLIB_STATIC_ASSERT)
# if GEOGRAPHICLIB_HAS_STATIC_ASSERT
# define GEOGRAPHICLIB_STATIC_ASSERT static_assert
# else
# define GEOGRAPHICLIB_STATIC_ASSERT(cond,reason) \
{ enum{ GEOGRAPHICLIB_STATIC_ASSERT_ENUM = 1/int(cond) }; }
# endif
#endif
#if defined(_MSC_VER) && defined(GEOGRAPHICLIB_SHARED_LIB) && \
GEOGRAPHICLIB_SHARED_LIB
# if GEOGRAPHICLIB_SHARED_LIB > 1
# error GEOGRAPHICLIB_SHARED_LIB must be 0 or 1
# elif defined(GeographicLib_SHARED_EXPORTS)
# define GEOGRAPHICLIB_EXPORT __declspec(dllexport)
# else
# define GEOGRAPHICLIB_EXPORT __declspec(dllimport)
# endif
#else
# define GEOGRAPHICLIB_EXPORT
#endif
// Use GEOGRAPHICLIB_DEPRECATED to mark functions, types or variables as
// deprecated. Code inspired by Apache Subversion's svn_types.h file (via
// MPFR).
#if defined(__GNUC__)
# if __GNUC__ > 4
# define GEOGRAPHICLIB_DEPRECATED(msg) __attribute__((deprecated(msg)))
# else
# define GEOGRAPHICLIB_DEPRECATED(msg) __attribute__((deprecated))
# endif
#elif defined(_MSC_VER) && _MSC_VER >= 1300
# define GEOGRAPHICLIB_DEPRECATED(msg) __declspec(deprecated(msg))
#else
# define GEOGRAPHICLIB_DEPRECATED(msg)
#endif
#include <stdexcept>
#include <string>
/**
* \brief Namespace for %GeographicLib
*
* All of %GeographicLib is defined within the GeographicLib namespace. In
* addition all the header files are included via %GeographicLib/Class.hpp.
* This minimizes the likelihood of conflicts with other packages.
**********************************************************************/
namespace GeographicLib {
/**
* \brief %Constants needed by %GeographicLib
*
* Define constants specifying the WGS84 ellipsoid, the UTM and UPS
* projections, and various unit conversions.
*
* Example of use:
* \include example-Constants.cpp
**********************************************************************/
class GEOGRAPHICLIB_EXPORT Constants {
private:
Constants(); // Disable constructor
public:
/**
* A synonym for Math::degree<double>().
**********************************************************************/
static double degree() { return Math::degree(); }
/**
* @return the number of radians in an arcminute.
**********************************************************************/
static double arcminute()
{ return Math::degree() / 60; }
/**
* @return the number of radians in an arcsecond.
**********************************************************************/
static double arcsecond()
{ return Math::degree() / 3600; }
/** \name Ellipsoid parameters
**********************************************************************/
///@{
/**
* @tparam T the type of the returned value.
* @return the equatorial radius of WGS84 ellipsoid (6378137 m).
**********************************************************************/
template<typename T> static T WGS84_a()
{ return 6378137 * meter<T>(); }
/**
* A synonym for WGS84_a<double>().
**********************************************************************/
static double WGS84_a() { return WGS84_a<double>(); }
/**
* @tparam T the type of the returned value.
* @return the flattening of WGS84 ellipsoid (1/298.257223563).
**********************************************************************/
template<typename T> static T WGS84_f() {
// Evaluating this as 1000000000 / T(298257223563LL) reduces the
// round-off error by about 10%. However, expressing the flattening as
// 1/298.257223563 is well ingrained.
return 1 / ( T(298257223563LL) / 1000000000 );
}
/**
* A synonym for WGS84_f<double>().
**********************************************************************/
static double WGS84_f() { return WGS84_f<double>(); }
/**
* @tparam T the type of the returned value.
* @return the gravitational constant of the WGS84 ellipsoid, \e GM, in
* m<sup>3</sup> s<sup>&minus;2</sup>.
**********************************************************************/
template<typename T> static T WGS84_GM()
{ return T(3986004) * 100000000 + 41800000; }
/**
* A synonym for WGS84_GM<double>().
**********************************************************************/
static double WGS84_GM() { return WGS84_GM<double>(); }
/**
* @tparam T the type of the returned value.
* @return the angular velocity of the WGS84 ellipsoid, &omega;, in rad
* s<sup>&minus;1</sup>.
**********************************************************************/
template<typename T> static T WGS84_omega()
{ return 7292115 / (T(1000000) * 100000); }
/**
* A synonym for WGS84_omega<double>().
**********************************************************************/
static double WGS84_omega() { return WGS84_omega<double>(); }
/**
* @tparam T the type of the returned value.
* @return the equatorial radius of GRS80 ellipsoid, \e a, in m.
**********************************************************************/
template<typename T> static T GRS80_a()
{ return 6378137 * meter<T>(); }
/**
* A synonym for GRS80_a<double>().
**********************************************************************/
static double GRS80_a() { return GRS80_a<double>(); }
/**
* @tparam T the type of the returned value.
* @return the gravitational constant of the GRS80 ellipsoid, \e GM, in
* m<sup>3</sup> s<sup>&minus;2</sup>.
**********************************************************************/
template<typename T> static T GRS80_GM()
{ return T(3986005) * 100000000; }
/**
* A synonym for GRS80_GM<double>().
**********************************************************************/
static double GRS80_GM() { return GRS80_GM<double>(); }
/**
* @tparam T the type of the returned value.
* @return the angular velocity of the GRS80 ellipsoid, &omega;, in rad
* s<sup>&minus;1</sup>.
*
* This is about 2 &pi; 366.25 / (365.25 &times; 24 &times; 3600) rad
* s<sup>&minus;1</sup>. 365.25 is the number of days in a Julian year and
* 365.35/366.25 converts from solar days to sidedouble days. Using the
* number of days in a Gregorian year (365.2425) results in a worse
* approximation (because the Gregorian year includes the precession of the
* earth's axis).
**********************************************************************/
template<typename T> static T GRS80_omega()
{ return 7292115 / (T(1000000) * 100000); }
/**
* A synonym for GRS80_omega<double>().
**********************************************************************/
static double GRS80_omega() { return GRS80_omega<double>(); }
/**
* @tparam T the type of the returned value.
* @return the dynamical form factor of the GRS80 ellipsoid,
* <i>J</i><sub>2</sub>.
**********************************************************************/
template<typename T> static T GRS80_J2()
{ return T(108263) / 100000000; }
/**
* A synonym for GRS80_J2<double>().
**********************************************************************/
static double GRS80_J2() { return GRS80_J2<double>(); }
/**
* @tparam T the type of the returned value.
* @return the central scale factor for UTM (0.9996).
**********************************************************************/
template<typename T> static T UTM_k0()
{return T(9996) / 10000; }
/**
* A synonym for UTM_k0<double>().
**********************************************************************/
static double UTM_k0() { return UTM_k0<double>(); }
/**
* @tparam T the type of the returned value.
* @return the central scale factor for UPS (0.994).
**********************************************************************/
template<typename T> static T UPS_k0()
{ return T(994) / 1000; }
/**
* A synonym for UPS_k0<double>().
**********************************************************************/
static double UPS_k0() { return UPS_k0<double>(); }
///@}
/** \name SI units
**********************************************************************/
///@{
/**
* @tparam T the type of the returned value.
* @return the number of meters in a meter.
*
* This is unity, but this lets the internal system of units be changed if
* necessary.
**********************************************************************/
template<typename T> static T meter() { return T(1); }
/**
* A synonym for meter<double>().
**********************************************************************/
static double meter() { return meter<double>(); }
/**
* @return the number of meters in a kilometer.
**********************************************************************/
static double kilometer()
{ return 1000 * meter<double>(); }
/**
* @return the number of meters in a nautical mile (approximately 1 arc
* minute)
**********************************************************************/
static double nauticalmile()
{ return 1852 * meter<double>(); }
/**
* @tparam T the type of the returned value.
* @return the number of square meters in a square meter.
*
* This is unity, but this lets the internal system of units be changed if
* necessary.
**********************************************************************/
template<typename T> static T square_meter()
{ return meter<double>() * meter<double>(); }
/**
* A synonym for square_meter<double>().
**********************************************************************/
static double square_meter()
{ return square_meter<double>(); }
/**
* @return the number of square meters in a hectare.
**********************************************************************/
static double hectare()
{ return 10000 * square_meter<double>(); }
/**
* @return the number of square meters in a square kilometer.
**********************************************************************/
static double square_kilometer()
{ return kilometer() * kilometer(); }
/**
* @return the number of square meters in a square nautical mile.
**********************************************************************/
static double square_nauticalmile()
{ return nauticalmile() * nauticalmile(); }
///@}
/** \name Anachronistic British units
**********************************************************************/
///@{
/**
* @return the number of meters in an international foot.
**********************************************************************/
static double foot()
{ return double(254 * 12) / 10000 * meter<double>(); }
/**
* @return the number of meters in a yard.
**********************************************************************/
static double yard() { return 3 * foot(); }
/**
* @return the number of meters in a fathom.
**********************************************************************/
static double fathom() { return 2 * yard(); }
/**
* @return the number of meters in a chain.
**********************************************************************/
static double chain() { return 22 * yard(); }
/**
* @return the number of meters in a furlong.
**********************************************************************/
static double furlong() { return 10 * chain(); }
/**
* @return the number of meters in a statute mile.
**********************************************************************/
static double mile() { return 8 * furlong(); }
/**
* @return the number of square meters in an acre.
**********************************************************************/
static double acre() { return chain() * furlong(); }
/**
* @return the number of square meters in a square statute mile.
**********************************************************************/
static double square_mile() { return mile() * mile(); }
///@}
/** \name Anachronistic US units
**********************************************************************/
///@{
/**
* @return the number of meters in a US survey foot.
**********************************************************************/
static double surveyfoot()
{ return double(1200) / 3937 * meter<double>(); }
///@}
};
/**
* \brief Exception handling for %GeographicLib
*
* A class to handle exceptions. It's derived from std::runtime_error so it
* can be caught by the usual catch clauses.
*
* Example of use:
* \include example-GeographicErr.cpp
**********************************************************************/
class GeographicErr : public std::runtime_error {
public:
/**
* Constructor
*
* @param[in] msg a string message, which is accessible in the catch
* clause via what().
**********************************************************************/
GeographicErr(const std::string& msg) : std::runtime_error(msg) {}
};
} // namespace GeographicLib