From 7dfcc480ba1e19bd3232349fc733caef94034292 Mon Sep 17 00:00:00 2001
From: stainer_t <thomas.stainer@oecd-nea.org>
Date: Mon, 8 Sep 2025 13:48:49 +0200
Subject: Initial commit from Polytechnique Montreal

---
 Dragon/src/SYB4T2.f | 72 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 72 insertions(+)
 create mode 100644 Dragon/src/SYB4T2.f

(limited to 'Dragon/src/SYB4T2.f')

diff --git a/Dragon/src/SYB4T2.f b/Dragon/src/SYB4T2.f
new file mode 100644
index 0000000..2f71ab9
--- /dev/null
+++ b/Dragon/src/SYB4T2.f
@@ -0,0 +1,72 @@
+*DECK SYB4T2
+      SUBROUTINE SYB4T2 (NIR,JMINRA,XCOTEA,SINPHI,DCOTEB,COSPHI,ORIGIN,
+     & PENTES,ANGLES,IXRAYO,HXRAYO,DXMIN,DELTAC)
+*
+*-----------------------------------------------------------------------
+*
+*Purpose:
+* Compute the position of the next track intersecting with side 2 (west
+* side) in a sectorized 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
+* NIR     number of radius.
+* JMINRA  index of the first radius intercepting the side.
+* XCOTEA  radius interceptions.
+* SINPHI  sinus
+* DCOTEB  half-side of the rectangle (center-side position).
+* COSPHI  cosinus.
+* ORIGIN  origin of the track.
+* PENTES  slope of the track.
+* ANGLES  slope of the sector.
+* IXRAYO  index of the radius.
+* HXRAYO  central radius (generally a negative number).
+* DXMIN   accuracy.
+*
+*Parameters: output
+* DELTAC  position of the next trajectory.
+*
+*-----------------------------------------------------------------------
+*
+*----
+*  SUBROUTINE ARGUMENTS
+*----
+      INTEGER NIR,JMINRA,IXRAYO
+      REAL    XCOTEA(JMINRA:NIR),SINPHI,DCOTEB,COSPHI,ORIGIN,PENTES,
+     &        ANGLES,HXRAYO,DXMIN,DELTAC
+*
+* Rayon Exterieur Suivant
+      IF (JMINRA .LE. NIR) THEN
+      H0 = - DCOTEB * SINPHI
+      IF ((IXRAYO .EQ. JMINRA) .OR. (HXRAYO .GE. H0)) THEN
+        IR = IXRAYO
+        S  = 1.
+      ELSE
+        IR = IXRAYO - 1
+        S  = - 1.
+      ENDIF
+      IF (IR .LE. NIR) THEN
+        X = S * XCOTEA(IR)
+        D = DCOTEB * COSPHI + X * SINPHI
+        DELTAC = MIN(DELTAC, D)
+      ENDIF
+      ENDIF
+*
+* Secteur Suivant
+      DA = ANGLES - PENTES
+      D  = ABS(ANGLES) + ABS(PENTES)
+      IF (ABS(DA) .GT. DXMIN*D) THEN
+        D = ORIGIN / DA
+        DELTAC = MIN(DELTAC, D)
+      ENDIF
+*
+      RETURN
+      END
-- 
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