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103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
/*
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* This file is part of libcxxsupport.
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*
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* libcxxsupport 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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* libcxxsupport 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 libcxxsupport; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* libcxxsupport is being developed at the Max-Planck-Institut fuer Astrophysik
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* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
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* (DLR).
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*/
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/*! \file trafos.h
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* Celestial coordinate transformations.
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*
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* Copyright (C) 2005 Max-Planck-Society
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* \author Martin Reinecke
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*/
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#ifndef PLANCK_TRAFOS_H
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#define PLANCK_TRAFOS_H
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#include "vec3.h"
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#include "pointing.h"
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#include "rotmatrix.h"
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#include "cxxutils.h"
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#include "geom_utils.h"
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enum coordsys { Ecliptic, Equatorial, Galactic };
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/*! Class for celestial coordinate transformations. */
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class Trafo
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{
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private:
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rotmatrix mat;
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static vec3 xcc_dp_precess (const vec3 &iv, double iepoch, double oepoch);
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static double get_epsilon (double epoch);
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static vec3 xcc_dp_e_to_q (const vec3 &iv, double epoch);
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static vec3 xcc_dp_q_to_e (const vec3 &iv, double epoch);
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static vec3 xcc_dp_g_to_e (const vec3 &iv, double epoch);
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static vec3 xcc_dp_e_to_g (const vec3 &iv, double epoch);
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static vec3 xcc_v_convert(const vec3 &iv, double iepoch, double oepoch,
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coordsys isys,coordsys osys);
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static void coordsys2matrix (double iepoch, double oepoch, coordsys isys,
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coordsys osys, rotmatrix &matrix);
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public:
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/*! Creates a \a Trafo for transformation from \a iepoch and \a isys
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to \a oepoch and \a osys. */
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Trafo (double iepoch, double oepoch, coordsys isys, coordsys osys)
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{ coordsys2matrix (iepoch, oepoch, isys, osys, mat); }
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/*! Transforms the vector \a vec and returns the result. */
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vec3 operator() (const vec3 &vec) const
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{ return mat.Transform(vec); }
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/*! Transforms the pointing \a ptg and returns the result. */
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pointing operator() (const pointing &ptg) const
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{ return pointing(operator()(vec3(ptg))); }
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/*! Transforms the pointing \a ptg and returns it in \a newptg.
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On exit, \a delta_psi holds the change in orientation. */
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void rotatefull (const pointing &ptg, pointing &newptg,
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double &delta_psi) const
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{
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const double halfpi_=1.570796326794896619231321691639751442099;
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vec3 vec (ptg);
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vec3 east (-vec.y,vec.x,0.);
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vec3 newvec = operator()(vec);
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vec3 neweast = operator()(east);
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delta_psi = orientation(newvec,neweast)+halfpi_;
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newptg = newvec;
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}
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/*! Transforms the vector \a vec and returns it in \a newvec.
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On exit, \a delta_psi holds the change in orientation. */
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void rotatefull (const vec3 &vec, vec3 &newvec, double &delta_psi) const
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{
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const double halfpi_=1.570796326794896619231321691639751442099;
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vec3 east (-vec.y,vec.x,0.);
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newvec = operator()(vec);
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vec3 neweast = operator()(east);
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delta_psi = orientation(newvec,neweast)+halfpi_;
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}
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/*! Returns the internally used rotation matrix. */
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const rotmatrix &Matrix() const
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{ return mat; }
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};
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#endif
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