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*DECK SYB7TE
SUBROUTINE SYB7TE (NRD,MRE,XICOTE,IRMAX,DELTCE,DELTCS,ORIPH6,
& ORIPH3,COSPH6,COSPH3,ISE2,LGTRAE,DELTAE)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the intersection lenghts of a track in a sectorized hexagonal
* cell, following a singular point at east.
*
*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
* NRD one plus the number of tube in the cell.
* MRE first radius intersection the side or first region in contact
* with the external side.
* XICOTE intersections with the side.
* IRMAX region index in contact with the external side.
* DELTCE distance from the east corner.
* DELTCS distance from the south-east corner.
* ORIPH6 distance at the middle of north-east side.
* ORIPH3 distance at the middle of south-east side.
* COSPH6 cosinus ($\\pi$/6-Phi).
* COSPH3 cosinus ($\\pi$/6+Phi).
*
*Parameters: input/output
* ISE2 half side on east (8 followed by 7-6 or NE followed by
* SE (north and south)).
*
*Parameters: output
* LGTRAE removing/addition flag of the next intersection. A removing
* occurs if and only if the track cross a sector and the
* south-east north (upper) zone.
* DELTAE distance of the next track.
*
*-----------------------------------------------------------------------
*
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NRD,MRE,IRMAX,ISE2
REAL XICOTE(NRD-1),DELTCE,DELTCS,ORIPH6,ORIPH3,COSPH6,COSPH3,
& DELTAE
LOGICAL LGTRAE
*
IF (ISE2 .EQ. 8) THEN
LGTRAE = (IRMAX .EQ. NRD)
IF (LGTRAE) THEN
DELTAE = DELTCE
ELSE
DELTAE = XICOTE(IRMAX) * COSPH6 - ORIPH6
ENDIF
ELSE
LGTRAE = ISE2 .EQ. 7
IF (LGTRAE) THEN
LGTRAE = IRMAX .GT. MRE
ENDIF
IF (LGTRAE) THEN
DELTAE = ORIPH3 - XICOTE(IRMAX-1) * COSPH3
ELSE
ISE2 = 6
IF (IRMAX .LT. NRD) THEN
DELTAE = ORIPH3 + XICOTE(IRMAX) * COSPH3
ELSE
DELTAE = DELTCS
ENDIF
ENDIF
ENDIF
*
RETURN
END
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