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[u/mrichter/AliRoot.git] / GEANT321 / gdraw / gdcirc.F
1 *
2 * $Id$
3 *
4 * $Log$
5 * Revision 1.1.1.1  1995/10/24 10:20:22  cernlib
6 * Geant
7 *
8 *
9 #include "geant321/pilot.h"
10 *CMZ :  3.21/02 29/03/94  15.41.26  by  S.Giani
11 *-- Author :
12       SUBROUTINE GDCIRC(R,Z0)
13 C.
14 C.    ******************************************************************
15 C.    *                                                                *
16 C.    *       Draw a circle of radius R centered on Z-axis,            *
17 C.    *       at a distance of Z0 from the origin,                     *
18 C.    *       on a plane parallel to X-Y plane                         *
19 C.    *                                                                *
20 C.    *    ==>Called by : GDRAWS                                       *
21 C.    *       Author : P.Zanarini   *********                          *
22 C.    *                                                                *
23 C.    ******************************************************************
24 C.
25 #include "geant321/gcdraw.inc"
26       DIMENSION X(3,41),U(41),V(41)
27 C.
28 C.    ------------------------------------------------------------------
29 C.
30       IF (R.LT.0.0001) GO TO 999
31 C
32       DO 10 I=1,40
33          X(1,I)=R*GCOS(I)
34          X(2,I)=R*GSIN(I)
35          X(3,I)=Z0
36    10 CONTINUE
37 C
38       CALL GDFR3D(X,40,U,V)
39 C
40 CM             Short circuit in case of GMR
41 C
42       IF ( IGMR .NE. 0 ) GO TO 999
43 CM
44       U(41)=U(1)
45       V(41)=V(1)
46       CALL GDRAWV(U,V,41)
47 C
48   999 RETURN
49       END