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*=======================================================================
*
* WCSLIB 7.12 - an implementation of the FITS WCS standard.
* Copyright (C) 1995-2022, Mark Calabretta
*
* This file is part of WCSLIB.
*
* WCSLIB is free software: you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* WCSLIB 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 Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with WCSLIB. If not, see http://www.gnu.org/licenses.
*
* Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
* http://www.atnf.csiro.au/people/Mark.Calabretta
* $Id: twcssub.f,v 7.12 2022/09/09 04:57:58 mcalabre Exp $
*=======================================================================
PROGRAM TWCSSUB
*-----------------------------------------------------------------------
*
* TWCSSUB tests WCSSUB which extracts the coordinate description for a
* subimage from a wcsprm struct.
*
*-----------------------------------------------------------------------
* Number of axes.
INTEGER NAXIS
PARAMETER (NAXIS = 4)
INTEGER AXES(NAXIS), I, J, K, NPS, NPV, NSUB, PSI(10), PSM(10),
: PVI(10), PVM(10), STATUS
DOUBLE PRECISION CDELT(NAXIS), CRPIX(NAXIS), CRVAL(NAXIS),
: LATPOLE, LONPOLE, PC(NAXIS,NAXIS), PV(10), RESTFRQ,
: RESTWAV
CHARACTER CNAME(NAXIS)*72, CTYPE(NAXIS)*72, CUNIT(NAXIS)*72,
: PS(10)*72
* On some systems, such as Sun Sparc, the structs MUST be aligned
* on a double precision boundary, done here using equivalences.
* Failure to do this may result in mysterious "bus errors".
INCLUDE 'wcs.inc'
INCLUDE 'wcserr.inc'
INTEGER WCS(WCSLEN), WCSEXT(WCSLEN)
DOUBLE PRECISION DUMMY1, DUMMY2
EQUIVALENCE (WCS,DUMMY1), (WCSEXT,DUMMY2)
DATA (CRPIX(J), J=1,NAXIS)
: / 1025D0, 64D0, 512D0, 513D0/
DATA ((PC(I,J),J=1,NAXIS),I=1,NAXIS)
: / 1.1D0, 0D0, 0D0, 0D0,
: 0D0, 1.0D0, 0D0, 0D0,
: 0D0, 0D0, 1.0D0, 0.1D0,
: 0D0, 0D0, 0.2D0, 1.0D0/
DATA (CDELT(I), I=1,NAXIS)
: /-9.2D-6, 10D0, 1D0, -1D0/
DATA (CUNIT(I), I=1,NAXIS)
: /'m', 's', 'deg', 'deg'/
DATA (CTYPE(I), I=1,NAXIS)
: /'WAVE-F2W', 'TIME', 'XLAT-SZP', 'XLON-SZP'/
DATA (CRVAL(I), I=1,NAXIS)
: /0.214982042D0, -2D3, -30D0, 150D0/
DATA LONPOLE /150D0/
DATA LATPOLE /999D0/
DATA RESTFRQ /1.42040575D9/
DATA RESTWAV /0D0/
DATA (CNAME(I), I=1,NAXIS)
: /'Wavelength', 'Time', 'Latitude', 'Longitude'/
PARAMETER (NPV = 4)
DATA (PVI(K), PVM(K), PV(K), K=1,NPV)
: /1, 1, -1D0,
: 3, 1, 2D0,
: 3, 2, 210D0,
: 3, 3, 60D0/
PARAMETER (NPS = 1)
DATA (PSI(K), PSM(K), PS(K), K=1,NPS)
: /2, 1, 'UTC'/
*-----------------------------------------------------------------------
STATUS = WCSPTI (WCS, WCS_FLAG, -1, 0, 0)
STATUS = WCSINI (NAXIS, WCS)
DO 20 I = 1, NAXIS
STATUS = WCSPTD (WCS, WCS_CRPIX, CRPIX(I), I, 0)
DO 10 J = 1, NAXIS
STATUS = WCSPTD (WCS, WCS_PC, PC(I,J), I, J)
10 CONTINUE
STATUS = WCSPTD (WCS, WCS_CDELT, CDELT(I), I, 0)
STATUS = WCSPTC (WCS, WCS_CUNIT, CUNIT(I), I, 0)
STATUS = WCSPTC (WCS, WCS_CTYPE, CTYPE(I), I, 0)
STATUS = WCSPTD (WCS, WCS_CRVAL, CRVAL(I), I, 0)
STATUS = WCSPTC (WCS, WCS_CNAME, CNAME(I), I, 0)
20 CONTINUE
STATUS = WCSPTD (WCS, WCS_LONPOLE, LONPOLE, 0, 0)
STATUS = WCSPTD (WCS, WCS_LATPOLE, LATPOLE, 0, 0)
STATUS = WCSPTD (WCS, WCS_RESTFRQ, RESTFRQ, 0, 0)
STATUS = WCSPTD (WCS, WCS_RESTWAV, RESTWAV, 0, 0)
DO 30 K = 1, NPV
STATUS = WCSPTD (WCS, WCS_PV, PV(K), PVI(K), PVM(K))
30 CONTINUE
DO 40 K = 1, NPS
STATUS = WCSPTC (WCS, WCS_PS, PS(K), PSI(K), PSM(K))
40 CONTINUE
* Extract information from the FITS header.
STATUS = WCSSET (WCS)
IF (STATUS.NE.0) THEN
WRITE (*, 50) STATUS
50 FORMAT ('WCSSET ERROR',I3,'.')
GO TO 999
END IF
WRITE (*, 60)
60 FORMAT (
: 'Testing WCSLIB subimage extraction subroutine (twcssub.f)',/,
: '---------------------------------------------------------',//,
: 'Initial contents of wcsprm struct:')
CALL FLUSH(6)
STATUS = WCSPRT (WCS)
* Extract the coordinate description for a subimage and add an axis.
NSUB = 4
AXES(1) = WCSSUB_LONGITUDE
AXES(2) = WCSSUB_LATITUDE
AXES(3) = -(WCSSUB_SPECTRAL + WCSSUB_STOKES)
AXES(4) = 0
WRITE (6, 70)
70 FORMAT (//,'Extracted contents of wcsprm struct:')
STATUS = WCSPTI (WCSEXT, WCS_FLAG, -1, 0, 0)
STATUS = WCSSUB (WCS, NSUB, AXES, WCSEXT)
CALL FLUSH(6)
IF (STATUS.NE.0) THEN
STATUS = WCSPERR (WCSEXT, CHAR(0))
ELSE
STATUS = WCSSET (WCSEXT)
IF (STATUS.NE.0) THEN
STATUS = WCSPERR (WCSEXT, CHAR(0))
ELSE
STATUS = WCSPRT (WCSEXT)
END IF
END IF
* Set it up for failure by setting PC1_3 non-zero.
STATUS = WCSPTD (WCS, WCS_PC, 1D0, 1, 3)
NSUB = 2
AXES(1) = 4
AXES(2) = 3
STATUS = WCSSUB(WCS, NSUB, AXES, WCSEXT)
IF (STATUS.EQ.WCSERR_NON_SEPARABLE) THEN
WRITE (6, 80) WCSERR_NON_SEPARABLE
80 FORMAT (//,'Received wcssub status',I3,' as expected for a '
: 'non-separable subimage',/,'coordinate system.')
ELSE
WRITE (6, 90) WCSERR_NON_SEPARABLE, STATUS
90 FORMAT (//,'ERROR: expected wcssub status',I3,' for a non-',
: 'separable subimage coordinate',/,'system, but received ',
: 'status',I3,' instead.')
END IF
STATUS = WCSFREE (WCSEXT)
999 STATUS = WCSFREE (WCS)
END
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