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*DECK SYB4T4
SUBROUTINE SYB4T4 (NIR,JMINRA,XCOTEA,SINPHI,DCOTEB,COSPHI,ORIGIN,
& PENTES,ANGLES,IXRAYO,DELTAH,DXMIN,DELTAC)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Compute the position of the next track intersecting with side 4 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.
* DELTAH position of the corner.
* 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,DELTAH,DXMIN,DELTAC
*
* Rayon Exterieur Suivant
IF (JMINRA .LE. NIR) THEN
IF (IXRAYO .LE. NIR) THEN
Y = XCOTEA(IXRAYO)
D = Y * SINPHI - DCOTEB * COSPHI
DELTAC = MIN(DELTAC, D)
ENDIF
ENDIF
*
* Secteur Suivant
DA = ANGLES - PENTES
IF (ABS(DA) .GT. DXMIN) THEN
D = ORIGIN / DA
DELTAC = MIN(DELTAC, D)
ENDIF
*
* Coin Sud-West
DELTAC = MIN(DELTAC, DELTAH)
*
RETURN
END
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