WCSLIB  7.3
wcslib.h
Go to the documentation of this file.
1 /*============================================================================
2 
3  WCSLIB 7.3 - an implementation of the FITS WCS standard.
4  Copyright (C) 1995-2020, Mark Calabretta
5 
6  This file is part of WCSLIB.
7 
8  WCSLIB is free software: you can redistribute it and/or modify it under the
9  terms of the GNU Lesser General Public License as published by the Free
10  Software Foundation, either version 3 of the License, or (at your option)
11  any later version.
12 
13  WCSLIB is distributed in the hope that it will be useful, but WITHOUT ANY
14  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15  FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
16  more details.
17 
18  You should have received a copy of the GNU Lesser General Public License
19  along with WCSLIB. If not, see http://www.gnu.org/licenses.
20 
21  Direct correspondence concerning WCSLIB to mark@calabretta.id.au
22 
23  Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
24  http://www.atnf.csiro.au/people/Mark.Calabretta
25  $Id: wcslib.h,v 7.3 2020/06/03 03:37:02 mcalabre Exp $
26 *=============================================================================
27 *
28 * WCSLIB 7.3 - C routines that implement the FITS World Coordinate System
29 * (WCS) standard. Refer to the README file provided with WCSLIB for an
30 * overview of the library.
31 *
32 * Summary of wcslib.h
33 * -------------------
34 * This header file is provided purely for convenience. Use it to include all
35 * of the separate WCSLIB headers.
36 *
37 *===========================================================================*/
38 
39 #ifndef WCSLIB_WCSLIB
40 #define WCSLIB_WCSLIB
41 
42 #include "cel.h"
43 #include "dis.h"
44 #include "fitshdr.h"
45 #include "lin.h"
46 #include "log.h"
47 #include "prj.h"
48 #include "spc.h"
49 #include "sph.h"
50 #include "spx.h"
51 #include "tab.h"
52 #include "wcs.h"
53 #include "wcserr.h"
54 #include "wcsfix.h"
55 #include "wcshdr.h"
56 #include "wcsmath.h"
57 #include "wcsprintf.h"
58 #include "wcstrig.h"
59 #include "wcsunits.h"
60 #include "wcsutil.h"
61 #include "wtbarr.h"
62 
63 #endif /* WCSLIB_WCSLIB */
64 
3474  wcserr_enable(1);
3475  wcsprintf_set(stderr);
3476 
3477  ...
3478 
3479  if (wcsset(&wcs) {
3480  wcsperr(&wcs);
3481  return wcs.err->status;
3482  }
3483 @endverbatim
3484 In this example, if an error was generated in one of the prjset() functions,
3485 wcsperr() would print an error traceback starting with wcsset(), then
3486 celset(), and finally the particular projection-setting function that
3487 generated the error. For each of them it would print the status return value,
3488 function name, source file, line number, and an error message which may be
3489 more specific and informative than the general error messages reported in the
3490 first example. For example, in response to a deliberately generated error,
3491 the @c twcs test program, which tests wcserr among other things, produces a
3492 traceback similar to this:
3493 @verbatim
3494 ERROR 5 in wcsset() at line 1564 of file wcs.c:
3495  Invalid parameter value.
3496 ERROR 2 in celset() at line 196 of file cel.c:
3497  Invalid projection parameters.
3498 ERROR 2 in bonset() at line 5727 of file prj.c:
3499  Invalid parameters for Bonne's projection.
3500 @endverbatim
3501 
3502 Each of the @ref structs "structs" in @ref overview "WCSLIB" includes a
3503 pointer, called @a err, to a wcserr struct. When an error occurs, a struct is
3504 allocated and error information stored in it. The wcserr pointers and the
3505 @ref memory "memory" allocated for them are managed by the routines that
3506 manage the various structs such as wcsinit() and wcsfree().
3507 
3508 wcserr messaging is an opt-in system enabled via wcserr_enable(), as in the
3509 example above. If enabled, when an error occurs it is the user's
3510 responsibility to free the memory allocated for the error message using
3511 wcsfree(), celfree(), prjfree(), etc. Failure to do so before the struct goes
3512 out of scope will result in memory leaks (if execution continues beyond the
3513 error).
3514 */
3515 
3516 
celset
int celset(struct celprm *cel)
Setup routine for the celprm struct.
celfree
int celfree(struct celprm *cel)
Destructor for the celprm struct.
cel.h
fitshdr.h
spc.h
wcsinit
int wcsinit(int alloc, int naxis, struct wcsprm *wcs, int npvmax, int npsmax, int ndpmax)
Default constructor for the wcsprm struct.
sph.h
wcsprintf.h
wcstrig.h
wcsset
int wcsset(struct wcsprm *wcs)
Setup routine for the wcsprm struct.
wcsfix.h
wcs.h
wcsmath.h
prjfree
int prjfree(struct prjprm *prj)
Destructor for the prjprm struct.
tab.h
log.h
wcsperr
int wcsperr(const struct wcsprm *wcs, const char *prefix)
Print error messages from a wcsprm struct.
prjset
int prjset(struct prjprm *prj)
Generic setup routine for the prjprm struct.
wcserr_enable
int wcserr_enable(int enable)
Enable/disable error messaging.
spx.h
wcserr
Error message handling.
Definition: wcserr.h:223
wcsutil.h
wcsfree
int wcsfree(struct wcsprm *wcs)
Destructor for the wcsprm struct.
wcshdr.h
lin.h
bonset
int bonset(struct prjprm *prj)
Set up a prjprm struct for Bonne's (BON) projection.
wcsprintf_set
int wcsprintf_set(FILE *wcsout)
Set output disposition for wcsprintf() and wcsfprintf().
prj.h
wtbarr.h
dis.h
wcserr.h
wcsunits.h