Merge commit 'd26ed8388f100a12996c0b92a98040ef2ba7fa8e' as 'ast'

1 files changed, 189 insertions, 0 deletions

diff --git a/ast/wcstrig.c b/ast/wcstrig.c
new file mode 100644
index 0000000..d3ba400
--- /dev/null
+++ b/ast/wcstrig.c
@@ -0,0 +1,189 @@
+/*============================================================================
+*
+*   WCSLIB - an implementation of the FITS WCS proposal.
+*   Copyright (C) 1995-2002, 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., 51 Franklin Street,Fifth Floor, Boston, MA 02110-1301, 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
+*
+*=============================================================================
+*
+*  This version of wcstrig.c is based on the version in wcslib-2.9, but has
+*  been modified in the following ways by the Starlink project (e-mail:
+*  ussc@star.rl.ac.uk):
+*     -  Support for non-ANSI C "const" class removed
+*     -  Changed names of projection functions and degrees trig functions
+*        to avoid clashes with wcslib.
+*=============================================================================
+*
+*   The functions defined herein are trigonometric or inverse trigonometric
+*   functions which take or return angular arguments in decimal degrees.
+*
+*   $Id$
+*---------------------------------------------------------------------------*/
+
+#include <math.h>
+#include "wcsmath.h"
+#include "wcstrig.h"
+
+double astCosd(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 astSind(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 astTand(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 astACosd(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 astASind(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 astATand(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 astATan2d(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;
+}