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*DECK NXTTRS
FUNCTION NXTTRS(ITRCUR,ISYM)
*
*----------
*
*Purpose:
* Find new DRAGON TURN factor associated after a Cartesian symmetry
* is applied on an old DRAGON TURN factor.
*
*Copyright:
* Copyright (C) 2004 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): G. Marleau.
*
*Parameters: input
* ITRCUR initial turn factor.
* ISYM symmetry to consider where:
* =-1 indicates $Z$ reflection symmetry;
* = 1 indicates $X$ reflection symmetry;
* = 2 indicates $X=Y$ diagonal symmetry;
* = 3 indicates $Y$ reflection symmetry;
* = 4 indicates $X=-Y$ diagonal symmetry.
*
*Parameters: output
* NXTTRS turn factor after symmetry is applied.
*
*----
IMPLICIT NONE
*----
* Subroutine arguments
*----
INTEGER ITRCUR,ISYM
INTEGER NXTTRS
*----
* Local parameters
*----
INTEGER IOUT
CHARACTER NAMSBR*6
PARAMETER (IOUT=6,NAMSBR='NXTTRS')
INTEGER MAXTUR
PARAMETER (MAXTUR=12)
*----
* Local variables
*----
INTEGER ISZ,ICTP,IRTR
*----
* Test input data
* ITRCUR can be 1-8 or 13-20
* ISYM can be 1-4
*----
IF((ITRCUR .LE. 0) .OR.
> (ITRCUR .GE. 9 .AND. ITRCUR .LE. 12) .OR.
> (ITRCUR .GE. 21)) CALL XABORT(NAMSBR//
> ': Invalid TURN')
IF(ISYM .LT. -1 .OR.
> ISYM .EQ. 0 .OR.
> ISYM .GT. 4 ) CALL XABORT(NAMSBR//
> ': Invalid symmetry')
*----
* Find current symmetry factor in Z (ISZ) and current turn
* number in plane X-Y (ICTP)
*----
ISZ=((ITRCUR-1)/MAXTUR)
ICTP=MOD(ITRCUR-1,MAXTUR)+1
IF(ISYM .EQ. -1) THEN
*----
* Z symmetry
*----
ISZ=(1-ISZ)
ELSE
*----
* X, X-Y AND Y symmetry
*----
IRTR=((ICTP-1)/4)*4
ICTP=MOD(4-ICTP+IRTR+ISYM,4)+5-IRTR
ENDIF
NXTTRS=ICTP+MAXTUR*ISZ
RETURN
END
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