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*=======================================================================
*
* WCSLIB 7.4 - an implementation of the FITS WCS standard.
* Copyright (C) 1995-2021, 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: tlin.f,v 7.4 2021/01/31 02:24:52 mcalabre Exp $
*=======================================================================
PROGRAM TLIN
*-----------------------------------------------------------------------
*
* TLIN tests the linear transformation routines supplied with WCSLIB.
*
*-----------------------------------------------------------------------
DOUBLE PRECISION TOL
PARAMETER (TOL = 1D-13)
INTEGER NAXIS, NCOORD, NELEM
PARAMETER (NAXIS = 5, NCOORD = 2, NELEM = 9)
INTEGER I, J, K, NFAIL, STATUS
DOUBLE PRECISION CDELT(NAXIS), CRPIX(NAXIS), IMG(NELEM,2),
: PC(NAXIS,NAXIS), PIX0(NELEM,2), PIX(NELEM,2), RESID,
: RESIDMAX
* On some systems, such as Sun Sparc, the struct MUST be aligned
* on a double precision boundary, done here using an equivalence.
* Failure to do this may result in mysterious "bus errors".
INCLUDE 'lin.inc'
INTEGER LIN(LINLEN)
DOUBLE PRECISION DUMMY
EQUIVALENCE (LIN,DUMMY)
DATA (CRPIX(I), I=1,NAXIS)
: /256D0, 256D0, 64D0, 128D0, 1D0/
DATA ((PC(I,J),J=1,NAXIS),I=1,NAXIS)
: / 1.0D0, 0.5D0, 0D0, 0D0, 0D0,
: 0.5D0, 1.0D0, 0D0, 0D0, 0D0,
: 0.0D0, 0.0D0, 1D0, 0D0, 0D0,
: 0.0D0, 0.0D0, 0D0, 1D0, 0D0,
: 0.0D0, 0.0D0, 0D0, 0D0, 1D0/
DATA (CDELT(I), I=1,NAXIS)
: / 1.2D0, 2.3D0, 3.4D0, 4.5D0, 5.6D0/
DATA ((PIX0(I,J), I=1,NAXIS), J=1,2)
: /303.0D0, 265.0D0, 112.4D0, 144.5D0, 28.2D0,
: 19.0D0, 57.0D0, 2.0D0, 15.0D0, 42.0D0/
*-----------------------------------------------------------------------
WRITE (*, 10)
10 FORMAT (
: 'Testing WCSLIB linear transformation routines (tlin.f)',/,
: '------------------------------------------------------')
STATUS = LINPTI (LIN, LIN_FLAG, -1, 0, 0)
STATUS = LININI (NAXIS, LIN)
DO 30 I = 1, NAXIS
STATUS = LINPTD (LIN, LIN_CRPIX, CRPIX(I), I, 0)
DO 20 J = 1, NAXIS
STATUS = LINPTD (LIN, LIN_PC, PC(I,J), I, J)
20 CONTINUE
STATUS = LINPTD (LIN, LIN_CDELT, CDELT(I), I, 0)
30 CONTINUE
WRITE (*, *)
DO 50 K = 1, NCOORD
WRITE (*, 40) K, (PIX0(J,K), J=1,NAXIS)
40 FORMAT ('PIX',I2,':',10F14.8)
50 CONTINUE
STATUS = LINP2X (LIN, NCOORD, NELEM, PIX0, IMG)
IF (STATUS.NE.0) THEN
WRITE (*, 60) STATUS
60 FORMAT ('LINP2X ERROR',I3)
GO TO 999
END IF
WRITE (*, *)
DO 80 K = 1, NCOORD
WRITE (*, 70) K, (IMG(J,K), J=1,NAXIS)
70 FORMAT ('IMG',I2,':',10F14.8)
80 CONTINUE
STATUS = LINX2P (LIN, NCOORD, NELEM, IMG, PIX)
IF (STATUS.NE.0) THEN
WRITE (*, 90) STATUS
90 FORMAT ('LINX2P ERROR',I3)
GO TO 999
END IF
WRITE (*, *)
DO 100 K = 1, NCOORD
WRITE (*, 40) K, (PIX(J,K), J=1,NAXIS)
100 CONTINUE
* Check closure.
NFAIL = 0
RESIDMAX = 0D0
DO 120 K = 1, NCOORD
DO 110 J = 1, NAXIS
RESID = ABS(PIX(j,k) - PIX0(j,k))
IF (RESIDMAX.LT.RESID) RESIDMAX = RESID
IF (RESID.GT.TOL) NFAIL = NFAIL + 1
110 CONTINUE
120 CONTINUE
WRITE (*, 130) RESIDMAX
130 FORMAT (/,'LINP2X/LINX2P: Maximum closure residual =',1PE8.1,
: ' pixel.')
IF (NFAIL.NE.0) THEN
WRITE (*, 140) NFAIL
140 FORMAT (/,'FAIL:',I5,' closure residuals exceed reporting ',
: 'tolerance.')
ELSE
WRITE (*, 150)
150 FORMAT (/,'PASS: All closure residuals are within reporting ',
: 'tolerance.')
END IF
999 STATUS = LINFREE(LIN)
END
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