|
/*
|
|
* Copyright (C) 2021 Christopher J. Howard
|
|
*
|
|
* This file is part of Antkeeper source code.
|
|
*
|
|
* Antkeeper source code 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, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* Antkeeper source code 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 for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef ANTKEEPER_ASTRO_COORDINATES_HPP
|
|
#define ANTKEEPER_ASTRO_COORDINATES_HPP
|
|
|
|
#include "utility/fundamental-types.hpp"
|
|
|
|
namespace astro
|
|
{
|
|
|
|
/**
|
|
* Converts rectangular coordinates to spherical coordinates.
|
|
*
|
|
* @param rectangular Rectangular coordinates.
|
|
* @return Equivalent spherical coordinates, in the ISO order of radial distance, polar angle (radians), and azimuthal angle (radians).
|
|
*/
|
|
double3 rectangular_to_spherical(const double3& rectangular);
|
|
|
|
/**
|
|
* Convert spherical coordinates to rectangular coordinates.
|
|
*
|
|
* @param spherical Spherical coordinates, in the ISO order of radial distance, polar angle (radians), and azimuthal angle (radians).
|
|
* @return Equivalent rectangular coordinates.
|
|
*/
|
|
double3 spherical_to_rectangular(const double3& spherical);
|
|
|
|
/**
|
|
* Produces a matrix which transforms rectangular coordinates from ecliptic space to equatorial space.
|
|
*
|
|
* @param ecl Obliquity of the ecliptic, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 ecliptic_to_equatorial(double ecl);
|
|
|
|
/**
|
|
* Produces a matrix which transforms coordinates from ecliptic space to horizontal space.
|
|
*
|
|
* @param ecl Obliquity of the ecliptic, in radians.
|
|
* @param lat Observer's latitude, in radians.
|
|
* @param lst Local sidereal time, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 ecliptic_to_horizontal(double ecl, double lat, double lst);
|
|
|
|
/**
|
|
* Produces a matrix which transforms rectangular coordinates from equatorial space to ecliptic space.
|
|
*
|
|
* @param ecl Obliquity of the ecliptic, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 equatorial_to_ecliptic(double ecl);
|
|
|
|
/**
|
|
* Produces a matrix which transforms rectangular coordinates from equatorial space to horizontal space.
|
|
*
|
|
* @param lat Observer's latitude, in radians.
|
|
* @param lst Local sidereal time, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 equatorial_to_horizontal(double lat, double lst);
|
|
|
|
/**
|
|
* Produces a matrix which transforms rectangular coordinates from horizontal space to equatorial space.
|
|
*
|
|
* @param lat Observer's latitude, in radians.
|
|
* @param lst Local sidereal time, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 horizontal_to_equatorial(double lat, double lst);
|
|
|
|
/**
|
|
* Produces a matrix which transforms rectangular coordinates from horizontal space to ecliptic space.
|
|
*
|
|
* @param ecl Obliquity of the ecliptic, in radians.
|
|
* @param lat Observer's latitude, in radians.
|
|
* @param lst Local sidereal time, in radians.
|
|
* @return Transformation matrix.
|
|
*/
|
|
double3x3 horizontal_to_ecliptic(double ecl, double lat, double lst);
|
|
|
|
/// Matrix which transforms coordinates from horizontal space to a right-handed coordinate system.
|
|
constexpr double3x3 horizontal_to_right_handed =
|
|
{
|
|
0.0, 0.0, 1.0,
|
|
1.0, 0.0, 0.0,
|
|
0.0, -1.0, 0.0
|
|
};
|
|
|
|
} // namespace astro
|
|
|
|
#endif // ANTKEEPER_ASTRO_COORDINATES_HPP
|