!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!! - Ariane - (May - 2007)
!!
!! bruno.blanke@univ-brest.fr and nicolas.grima@univ-brest.fr
!!
!! This software is a computer program whose purpose is
!! the computation of 3D streamlines in a given velocity field
!! (as the output of an Ocean General Circulation Model) and
!! subsequent water masses analyses.
!!
!! This software is governed by the CeCILL license under French law and
!! abiding by the rules of distribution of free software. You can use,
!! modify and/ or redistribute the software under the terms of the CeCILL
!! license as circulated by CEA, CNRS and INRIA at the following URL
!! "http://www.cecill.info".
!!
!! As a counterpart to the access to the source code and rights to copy,
!! modify and redistribute granted by the license, users are provided only
!! with a limited warranty and the software's author, the holder of the
!! economic rights, and the successive licensors have only limited
!! liability.
!!
!! In this respect, the user's attention is drawn to the risks associated
!! with loading, using, modifying and/or developing or reproducing the
!! software by the user in light of its specific status of free software,
!! that may mean that it is complicated to manipulate, and that also
!! therefore means that it is reserved for developers and experienced
!! professionals having in-depth computer knowledge. Users are therefore
!! encouraged to load and test the software's suitability as regards their
!! requirements in conditions enabling the security of their systems and/or
!! data to be ensured and, more generally, to use and operate it in the
!! same conditions as regards security.
!!
!! The fact that you are presently reading this means that you have had
!! knowledge of the CeCILL license and that you accept its terms.
!!
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
!!****h* ariane/mod_fx
!! NAME
!! mod_fx (mod_fx.f90 - Fortran90 module)
!!
!! USAGE
!! Include 'USE mod_fx' in the header of your Fortran 90 source
!! code.
!! Then you'll have access to the subroutine:
!! - fx
!!
!! AUTHOR
!! * Origin : Bruno Blanke (1992)
!! * F77toF90: Nicolas Grima (April-May 2005)
!!
!! CREATION DATE
!! * April-May 2005
!!
!! HISTORY
!! Date (dd/mm/yyyy/) - Modification(s)
!!
!! RESULT
!!
!!
!! EXAMPLES
!! * Use mod_fx
!!
!! NOTES
!! ROBODoc header style.
!!
!! TODO
!!
!!
!! PORTABILITY
!! Machine-OS - Fortran90/95 compiler
!! * i686-pc-linux-gnu - ifort
!! * i686-pc-linux-gnu - g95
!!
!! SEE ALSO
!! * mod_fy
!! * mod_fz
!!
!! USES
!! * USE mod_precision
!! * USE mod_namelist
!! * USE mod_input_grid
!!
!! USED BY
!! * posini
!! * trajec
!!
!! SOURCE
!!=========================================================================
MODULE mod_fx 7
USE mod_precision
USE mod_namelist
USE mod_input_grid
USE mod_reducmem
IMPLICIT NONE
CONTAINS
!!***
!========================================================================
!!****f* mod_fx/fx()
!! NAME
!! fx()
!!
!! FUNCTION
!! fx computes the ...
!!
!! AUTHOR
!! * Origin : Bruno Blanke (1992)
!! * F77toF90: Nicolas Grima (April-May 2005)
!!
!! CREATION DATE
!! * April-May 2005
!!
!! HISTORY
!! Date (dd/mm/yyyy/) - Modification(s)
!!
!! ARGUMENTS
!! * gi: i position.
!! * gj: j position.
!!
!! TODO
!! * add comments
!!
!! USED BY
!! * posini
!! * trajec
!! * mod_quant
!!
!! SOURCE
!!=======================================================================
FUNCTION fx(gi,gj) 50,4
!-------------!
! Declaration !
!-------------!
!- arguments -!
REAL(kind=rprec), INTENT(in) :: gi, gj
REAL(kind=rprec) :: fx
!- local variables -!
INTEGER(kind=iprec) :: i1, i2, i1s, i2s
INTEGER(kind=iprec) :: j1, j2, j1s, j2s
INTEGER(kind=iprec) :: k1s, k2s
INTEGER(kind=iprec) :: iper
REAL(kind=rprec) :: a, b
!-------------!
! Code begins !
!-------------!
i1 = INT(gi) ! i1 = integer part of gi
i2 = i1 + 1
a = gi - AINT(gi)
iper = 0 ! initialize iper (key_periodic)
!- test if the grid is periodic -!
IF (key_periodic) THEN
! add BB 25/06/09 pb drakkar, le saut en longitude n'est pas au voisinage de i=1
! IF (i1 == 1) iper = 1
IF (i1 == 429) iper = 1
! end BB 25/06/09 pb drakkar
IF (i2 >= imt) THEN
i1 = 1
i2 = 2
!pb drakkar iper = 1 ! BB 25/06/09
ENDIF
ELSE
IF (i2 > imt) i2 = i1
ENDIF
j1 = INT(gj+0.5_rprec)
j2 = j1 + 1
b = (gj + 0.5_rprec) - j1
IF (j2 > jmt) j2 = j1
!--------------------------------------------------------------!
! Here fx is computed !
!--------------------------------------------------------------!
CALL sub_reducmem_shift_or_not_ind
(i1,j1,1,i1s,j1s,k1s)
CALL sub_reducmem_shift_or_not_ind
(i2,j2,1,i2s,j2s,k2s)
fx= (1._rprec-a) * (1._rprec-b) * ( xx_uu(i1s, j1s, 1, 1) - iper * 360._rprec )+ &
(1._rprec-a) * b * ( xx_uu(i1s, j2s, 1, 1) - iper * 360._rprec )+ &
a * (1._rprec-b) * xx_uu(i2s, j1s, 1, 1) + &
a * b * xx_uu(i2s, j2s, 1, 1)
! add BB 25/06/09 blindage drakkar
IF (fx > 180.) fx=fx-180.
! end BB 25/06/09 blindage drakkar
!--------------------------------------------------------------!
RETURN
END FUNCTION fx
!!***
END MODULE mod_fx