public software.sextractor

/*

*                               wcstrig.c

*

* Trigonometric or inverse trigonometric functions.

*

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

*

*       This file part of:      AstrOmatic WCS library

*

*       Copyright:              (C) 2000-2010 Emmanuel Bertin -- IAP/CNRS/UPMC

*                               (C) 1995-1999 Mark Calabretta (original version)

*

*       Licenses:               GNU General Public License

*

*       AstrOmatic software 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.

*       AstrOmatic software 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 AstrOmatic software.

*       If not, see <http://www.gnu.org/licenses/>.

*

*       Last modified:          10/10/2010

*

*%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%*/

/*============================================================================

*

*   WCSLIB - an implementation of the FITS WCS proposal.

*   Copyright (C) 1995-1999, Mark Calabretta

*

*   This library is free software; you can redistribute it and/or modify it

*   under the terms of the GNU Library General Public License as published

*   by the Free Software Foundation; either version 2 of the License, or (at

*   your option) any later version.

*

*   This library 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 Library

*   General Public License for more details.

*

*   You should have received a copy of the GNU Library General Public License

*   along with this library; if not, write to the Free Software Foundation,

*   Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*

*   Correspondence concerning WCSLIB may be directed to:

*      Internet email: mcalabre@atnf.csiro.au

*      Postal address: Dr. Mark Calabretta,

*                      Australia Telescope National Facility,

*                      P.O. Box 76,

*                      Epping, NSW, 2121,

*                      AUSTRALIA

*

*=============================================================================

*

*   The functions defined herein are trigonometric or inverse trigonometric

*   functions which take or return angular arguments in decimal degrees.

*

*   $Id: wcstrig.c,v 1.1.1.1 2002/03/15 16:33:26 bertin Exp $

*---------------------------------------------------------------------------*/

#ifdef HAVE_CONFIG_H

#include        "config.h"

#endif

#ifdef HAVE_MATHIMF_H

#include <mathimf.h>

#else

#include <math.h>

#endif

#include "wcstrig.h"

#ifndef PI      /* EB 02/06/97 */

#define PI 3.141592653589793238462643

#endif          /* EB 02/06/97 */

const double d2r = PI / 180.0;

const double r2d = 180.0 / PI;

#ifndef HAVE_MATHIMF_H

double wcs_cosd(angle)

const double angle;

{

   double resid;

   resid = fabs(fmod(angle,360.0));

   if (resid == 0.0) {

      return 1.0;

   } else if (resid == 90.0) {

      return 0.0;

   } else if (resid == 180.0) {

      return -1.0;

   } else if (resid == 270.0) {

      return 0.0;

   }

   return cos(angle*d2r);

}

/*--------------------------------------------------------------------------*/

double wcs_sind(angle)

const double angle;

{

   double resid;

   resid = fmod(angle-90.0,360.0);

   if (resid == 0.0) {

      return 1.0;

   } else if (resid == 90.0) {

      return 0.0;

   } else if (resid == 180.0) {

      return -1.0;

   } else if (resid == 270.0) {

      return 0.0;

   }

   return sin(angle*d2r);

}

/*--------------------------------------------------------------------------*/

double wcs_tand(angle)

const double angle;

{

   double resid;

   resid = fmod(angle,360.0);

   if (resid == 0.0 || fabs(resid) == 180.0) {

      return 0.0;

   } else if (resid == 45.0 || resid == 225.0) {

      return 1.0;

   } else if (resid == -135.0 || resid == -315.0) {

      return -1.0;

   }

   return tan(angle*d2r);

}

/*--------------------------------------------------------------------------*/

double wcs_acosd(v)

const double v;

{

   if (v >= 1.0) {

      if (v-1.0 <  WCSTRIG_TOL) return 0.0;

   } else if (v == 0.0) {

      return 90.0;

   } else if (v <= -1.0) {

      if (v+1.0 > -WCSTRIG_TOL) return 180.0;

   }

   return acos(v)*r2d;

}

/*--------------------------------------------------------------------------*/

double wcs_asind(v)

const double v;

{

   if (v <= -1.0) {

      if (v+1.0 > -WCSTRIG_TOL) return -90.0;

   } else if (v == 0.0) {

      return 0.0;

   } else if (v >= 1.0) {

      if (v-1.0 <  WCSTRIG_TOL) return 90.0;

   }

   return asin(v)*r2d;

}

/*--------------------------------------------------------------------------*/

double wcs_atand(v)

const double v;

{

   if (v == -1.0) {

      return -45.0;

   } else if (v == 0.0) {

      return 0.0;

   } else if (v == 1.0) {

      return 45.0;

   }

   return atan(v)*r2d;

}

/*--------------------------------------------------------------------------*/

double wcs_atan2d(y, x)

const double x, y;

{

   if (y == 0.0) {

      if (x >= 0.0) {

         return 0.0;

      } else if (x < 0.0) {

         return 180.0;

      }

   } else if (x == 0.0) {

      if (y > 0.0) {

         return 90.0;

      } else if (y < 0.0) {

         return -90.0;

      }

   }

   return atan2(y,x)*r2d;

}

#endif