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*DECK SYB4TN
SUBROUTINE SYB4TN (NHMAX,IXRAYO,ISDEBU,COSECT,NRI,RAYONS,DELTAC)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Search of the next singular point in a Cartesian 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 intervals (the number of interceptions is NHMAX+1).
* IXRAYO tubes indices from west to east.
* ISDEBU index of the first sector.
* COSECT cosinus of the sector angles.
* NRI number of radius.
* RAYONS radius of the tubes.
*
*Parameters: input/output
* DELTAC next distance.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NHMAX,IXRAYO(NHMAX),ISDEBU,NRI
REAL COSECT(*),RAYONS(NRI),DELTAC
*----
* LOCAL VARIABLES
*----
LOGICAL LGSEC1,LGSEC2
*
IF (NHMAX .LT. 2) RETURN
IHX = 0
IR1 = IXRAYO(1)
IR2 = IXRAYO(2)
LGSEC2 = IR1 .EQ. IR2
IF (LGSEC2) THEN
ISC = ISDEBU + 1
ELSE
ISC = ISDEBU
ENDIF
*
DO IHC = 2, NHMAX - 1
LGSEC1 = LGSEC2
IR0 = IR1
IR1 = IR2
*
IR2 = IXRAYO(IHC+1)
LGSEC2 = IR1 .EQ. IR2
IF (LGSEC2) THEN
ISC = ISC + 1
ENDIF
*
* Tangente = Intersection Couronne
IF (IR2 .EQ. IR0) THEN
IF (IR2 .EQ. IR1+1) THEN
IF (RAYONS(IR1) .LT. DELTAC) THEN
DELTAC = RAYONS(IR1)
IHX = IHC
ENDIF
ENDIF
*
* Coin Secteur/Rayon
ELSEIF (LGSEC1) THEN
IF (IR2 .EQ. IR1+1) THEN
RR = RAYONS(IR1)
DD = RR * COSECT(ISC-1)
IF (DD .LT. DELTAC) THEN
DELTAC = DD
IHX = IHC
ENDIF
ENDIF
*
* Coin Secteur/Rayon
ELSEIF (LGSEC2) THEN
IF (IR0 .EQ. IR1+1) THEN
RR = RAYONS(IR1)
DD = RR * COSECT(ISC-1)
IF (DD .LT. DELTAC) THEN
DELTAC = DD
IHX = IHC
ENDIF
ENDIF
*
ENDIF
*
ENDDO
*
RETURN
END
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