!=============================================================================
!
! PGSBOX 8.6 - draw curvilinear coordinate axes for PGPLOT.
! Copyright (C) 1997-2026, Mark Calabretta
!
! This file is part of PGSBOX.
!
! PGSBOX 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.
!
! PGSBOX 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 PGSBOX.  If not, see http://www.gnu.org/licenses.
!
! Author: Mark Calabretta, Australia Telescope National Facility, CSIRO.
! http://www.atnf.csiro.au/computing/software/wcs
! $Id: pgcrfn_bindc.f90,v 8.6 2026/03/29 13:53:57 mcalabre Exp $
!=============================================================================

SUBROUTINE PGCRFN_ (OPCODE, NLC, NLI, NLD, FCODE, NLIPRM, NLDPRM, &
                    WORLD, PIXEL, CONTRL, CONTXT, IERR) BIND (C)

  ! For the sake of backwards compatibility, for applications written in C
  ! using cpgsbox(), a C-compatible interface must be maintained.
  USE ISO_C_BINDING

  INTEGER (KIND=C_INT) :: OPCODE, NLC, NLI, NLD
  CHARACTER (KIND=C_CHAR, LEN=1) :: FCODE(4,2)
  INTEGER (KIND=C_INT) :: NLIPRM(NLI)
  REAL (KIND=C_DOUBLE) :: NLDPRM(NLD,2), WORLD(2), PIXEL(2)
  INTEGER (KIND=C_INT) :: CONTRL
  REAL (KIND=C_DOUBLE) :: CONTXT(20)
  INTEGER (KIND=C_INT) :: IERR

  INTERFACE
    SUBROUTINE PGCRFN_F (OPCODE, NLC, NLI, NLD, FCODE, NLIPRM, NLDPRM, &
                         WORLD, PIXEL, CONTRL, CONTXT, IERR)

      INTEGER   :: OPCODE, NLC, NLI, NLD
      CHARACTER :: FCODE(2)*4
      INTEGER   :: NLIPRM(NLI)
      DOUBLE PRECISION :: NLDPRM(2,NLD), WORLD(2), PIXEL(2)
      INTEGER   :: CONTRL
      DOUBLE PRECISION :: CONTXT(20)
      INTEGER   :: IERR
    END SUBROUTINE PGCRFN_F
  END INTERFACE

  CALL PGCRFN_F (OPCODE, NLC, NLI, NLD, FCODE, NLIPRM, NLDPRM, &
               WORLD, PIXEL, CONTRL, CONTXT, IERR)
  RETURN
END SUBROUTINE PGCRFN_
