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*DECK SYB4TI
SUBROUTINE SYB4TI (NHMAX,IXRAYO,IS1,NSECT4,IFAC,NUMREG,NLMAX,
& IREGI)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Find the interception region indices of a track in a rectangular cell.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library 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 2.1 of the License, or (at your option) any later version
*
*Author(s): A. Hebert
*
*Parameters: input
* NHMAX number of interceptions.
* IXRAYO tube indices.
* IS1 index of the first sector.
* NSECT4 number of sectors.
* IFAC index of the symmetry.
* NUMREG region indices of the tube sectors.
*
*Parameters: output
* NLMAX number of interception regions.
* IREGI indices of the interception regions.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NHMAX,IXRAYO(NHMAX),IS1,NSECT4,IFAC,NUMREG(NSECT4,*),
& NLMAX,IREGI(NHMAX)
*----
* LOCAL VARIABLES
*----
*:IHE No de l'abcisse Est
*:IREGC No de la Region Courante
*:IREGS No de la Region Suivante
*:ISC No du Secteur Courant
*:IS2 No du Secteur Suivant
*:JRC No de la Couronne Courante
*:JRS No de la Couronne Suivante
*
JRC = IXRAYO(1)
ISC = IS1
ISF = ISC
IF (NSECT4 .GT. 1) THEN
IF (IFAC .EQ. 1) THEN
ISF = 1 - ISF
ELSEIF (IFAC .EQ. 2) THEN
ISF = ISF - NSECT4 / 2
ELSEIF (IFAC .EQ. 3) THEN
ISF = 1 + NSECT4 / 2 - ISF
ENDIF
IF (ISF .LE. 0) ISF = ISF + NSECT4
ENDIF
IREGC = NUMREG(ISF, JRC) + 3
*
* Dernier Intervalle
NLMAX = 1
*----
* Boucle des Volumes internes
* Debut
*----
DO IHE = 2, NHMAX
*
* No de Couronne Suivante
JRS = IXRAYO(IHE)
*
* Soit : Meme Couronne => Changement de Secteur
* Sinon : Changement de Couronne => No de Rayon
IF (JRC .EQ. JRS) THEN
IF (ISC .LT. NSECT4) THEN
IS2 = ISC + 1
ELSE
IS2 = 1
ENDIF
ELSE
IS2 = ISC
ENDIF
*
* +++
* Debut
* Region Suivante
ISF = IS2
IF (NSECT4 .GT. 1) THEN
IF (IFAC .EQ. 1) THEN
ISF = 1 - ISF
ELSEIF (IFAC .EQ. 2) THEN
ISF = ISF - NSECT4 / 2
ELSEIF (IFAC .EQ. 3) THEN
ISF = 1 + NSECT4 / 2 - ISF
ENDIF
IF (ISF .LE. 0) ISF = ISF + NSECT4
ENDIF
IREGS = NUMREG(ISF, JRS) + 3
IF (IREGS .NE. IREGC) THEN
IREGI(NLMAX) = IREGC
NLMAX = NLMAX + 1
IREGC = IREGS
ENDIF
* Fin Region Suivante
* +++
*
* Suivants
ISC = IS2
JRC = JRS
*
* - - - - - - - - - - - - -
* Boucle des Volumes internes
* Fin
* - - - - - - - - - - - - -
ENDDO
*
IREGI(NLMAX) = IREGC
*
RETURN
END
|
