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[u/mrichter/AliRoot.git] / GEANT321 / ggeom / grot.F

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+*
+* $Id$
+*
+* $Log$
+* Revision 1.1.1.1  1995/10/24 10:20:54  cernlib
+* Geant
+*
+*
+#include "geant321/pilot.h"
+*CMZ :  3.21/02 29/03/94  15.41.30  by  S.Giani
+*-- Author :
+      SUBROUTINE GROT(X,RMAT,XNEW)
+C.
+C.    ******************************************************************
+C.    *                                                                *
+C     *            ROUTINE TO ROTATE POINT X BY MATRIX RMAT TO         *
+C     *            FORM POINT XNEW.                                    *
+C     *                                                                *
+C.    *    ==>Called by : GNEXT, GTNEXT                                *
+C.    *         Author  A.McPherson  *********                         *
+C.    *                                                                *
+C.    ******************************************************************
+C.
+      DIMENSION X(3),XNEW(3),RMAT(10)
+C
+      IF(RMAT(10).NE.0.0) THEN
+         XNEW(1) = X(1)*RMAT(1) + X(2)*RMAT(2) + X(3)*RMAT(3)
+         XNEW(2) = X(1)*RMAT(4) + X(2)*RMAT(5) + X(3)*RMAT(6)
+         XNEW(3) = X(1)*RMAT(7) + X(2)*RMAT(8) + X(3)*RMAT(9)
+*
+      ELSE
+         XNEW(1) = X(1)
+         XNEW(2) = X(2)
+         XNEW(3) = X(3)
+*
+      ENDIF
+      END