/usr/include/relion-1.4/src/Healpix_2.15a/pointing.h is in librelion-dev-common 1.4+dfsg-3ubuntu1.
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* This file is part of Healpix_cxx.
*
* Healpix_cxx 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 2 of the License, or
* (at your option) any later version.
*
* Healpix_cxx 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 Healpix_cxx; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* For more information about HEALPix, see http://healpix.jpl.nasa.gov
*/
/*
* Healpix_cxx is being developed at the Max-Planck-Institut fuer Astrophysik
* and financially supported by the Deutsches Zentrum fuer Luft- und Raumfahrt
* (DLR).
*/
/*! \file src/Healpix_2.15a/cxxsupport/pointing.h
* Class representing a direction in 3D space
*
* Copyright (C) 2003 Max-Planck-Society
* \author Martin Reinecke
*/
#ifndef PLANCK_POINTING_H
#define PLANCK_POINTING_H
#include <cmath>
#include "src/Healpix_2.15a/vec3.h"
#include "src/Healpix_2.15a/cxxutils.h"
/*! \defgroup pointinggroup Pointings */
/*! \{ */
/*! Class representing a direction in 3D space or a location on the
unit sphere. */
class pointing
{
public:
/*! Colatitude of the pointing (i.e. the North pole is at \a theta=0). */
double theta;
/*! Longitude of the pointing. */
double phi;
/*! Default constructor. \a theta and \a phi are not initialized. */
pointing() {}
/*! Creates a pointing with \a Theta and \a Phi. */
pointing (double Theta, double Phi) : theta(Theta), phi(Phi) {}
// FIXME: should become "explicit" some time
/*! Creates a pointing from the vector \a inp. \a inp need not be
normalized. */
pointing (const vec3 &inp)
{
using namespace std;
theta = atan2(sqrt(inp.x*inp.x+inp.y*inp.y),inp.z);
phi = safe_atan2 (inp.y,inp.x);
if (phi<0) phi += twopi;
}
// FIXME: should be removed some time
/*! Returns a normalized vector pointing in the same direction. */
operator vec3() const
{
double st=sin(theta);
return vec3 (st*cos(phi), st*sin(phi), cos(theta));
}
/*! Returns a normalized vector pointing in the same direction. */
vec3 to_vec3() const
{
double st=sin(theta);
return vec3 (st*cos(phi), st*sin(phi), cos(theta));
}
/*! Changes the angles so that \a 0<=theta<=pi and \a 0<=phi<2*pi. */
void normalize()
{
theta=fmodulo(theta,twopi);
if (theta>pi)
{
phi+=pi;
theta=twopi-theta;
}
phi=fmodulo(phi,twopi);
}
};
/*! Converts \a vec to \a ptg. \a vec need not be normalized.
\relates pointing */
inline void vec2pnt(const vec3 &vec, pointing &ptg)
{
using namespace std;
ptg.theta = atan2(sqrt(vec.x*vec.x+vec.y*vec.y),vec.z);
ptg.phi = safe_atan2 (vec.y,vec.x);
if (ptg.phi<0) ptg.phi += twopi;
}
/*! Writes \a p to \a os.
\relates pointing */
inline std::ostream &operator<< (std::ostream &os, const pointing &p)
{
os << p.theta << ", " << p.phi << std::endl;
return os;
}
/*! \} */
#endif
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