💿🐜 Antkeeper source code
https://antkeeper.com
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108 lines
3.6 KiB
108 lines
3.6 KiB
/*
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* Copyright (C) 2020 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code 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 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code 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 Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_CELESTIAL_COORDINATES_HPP
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#define ANTKEEPER_CELESTIAL_COORDINATES_HPP
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#include "utility/fundamental-types.hpp"
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namespace ast
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{
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/**
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* Converts rectangular coordinates to spherical coordinates.
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*
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* @param rectangular Rectangular coordinates.
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* @return Equivalent spherical coordinates, in the ISO order of radial distance, polar angle (radians), and azimuthal angle (radians).
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*/
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double3 rectangular_to_spherical(const double3& rectangular);
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/**
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* Convert spherical coordinates to rectangular coordinates.
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*
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* @param spherical Spherical coordinates, in the ISO order of radial distance, polar angle (radians), and azimuthal angle (radians).
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* @return Equivalent rectangular coordinates.
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*/
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double3 spherical_to_rectangular(const double3& spherical);
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/**
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* Produces a matrix which transforms rectangular coordinates from ecliptic space to equatorial space.
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*
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* @param ecl Obliquity of the ecliptic, in radians.
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* @return Transformation matrix.
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*/
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double3x3 ecliptic_to_equatorial(double ecl);
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/**
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* Produces a matrix which transforms coordinates from ecliptic space to horizontal space.
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*
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* @param ecl Obliquity of the ecliptic, in radians.
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* @param lat Observer's latitude, in radians.
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* @param lmst Local mean sidereal time.
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* @return Transformation matrix.
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*/
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double3x3 ecliptic_to_horizontal(double ecl, double lat, double lmst);
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/**
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* Produces a matrix which transforms rectangular coordinates from equatorial space to ecliptic space.
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*
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* @param ecl Obliquity of the ecliptic, in radians.
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* @return Transformation matrix.
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*/
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double3x3 equatorial_to_ecliptic(double ecl);
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/**
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* Produces a matrix which transforms rectangular coordinates from equatorial space to horizontal space.
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*
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* @param lat Observer's latitude, in radians.
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* @param lmst Local mean sidereal time.
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* @return Transformation matrix.
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*/
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double3x3 equatorial_to_horizontal(double lat, double lmst);
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/**
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* Produces a matrix which transforms rectangular coordinates from horizontal space to equatorial space.
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*
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* @param lat Observer's latitude, in radians.
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* @param lmst Local mean sidereal time.
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* @return Transformation matrix.
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*/
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double3x3 horizontal_to_equatorial(double lat, double lmst);
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/**
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* Produces a matrix which transforms rectangular coordinates from horizontal space to ecliptic space.
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*
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* @param ecl Obliquity of the ecliptic, in radians.
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* @param lat Observer's latitude, in radians.
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* @param lmst Local mean sidereal time.
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* @return Transformation matrix.
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*/
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double3x3 horizontal_to_ecliptic(double ecl, double lat, double lmst);
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/// Matrix which transforms coordinates from horizontal space to a right-handed coordinate system.
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constexpr double3x3 horizontal_to_right_handed =
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{
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0.0, 0.0, 1.0,
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1.0, 0.0, 0.0,
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0.0, -1.0, 0.0
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};
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} // namespace ast
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#endif // ANTKEEPER_CELESTIAL_COORDINATES_HPP
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