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Commit | Line | Data |
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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:20:55 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.30 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE GSAPHI(V,PHIL,PHIH,SAF) | |
13 | C. | |
14 | C. ****************************************************************** | |
15 | C. * * | |
16 | C. * * | |
17 | C. * Subroutine GSAPHI computes the 'safety radius' from the * | |
18 | C. * point V to phi limits PHIL and PHIH. The safety radius is * | |
19 | C. * returned in SAF. * | |
20 | C. * A.C.McPherson 5th Sept. 1984. * | |
21 | C. * * | |
22 | C. ****************************************************************** | |
23 | C. | |
24 | #include "geant321/gconsp.inc" | |
25 | C | |
26 | DIMENSION V(3) | |
27 | C | |
28 | R=V(1)**2+V(2)**2 | |
29 | IF(R.GT.0.0) R=SQRT(R) | |
30 | C | |
31 | PHL=PHIL*DEGRAD | |
32 | PHH=PHIH*DEGRAD | |
33 | C | |
34 | C Check for case of complete 360 degree region. | |
35 | C | |
36 | SAF=BIG | |
37 | DPHI=PHIH-PHIL | |
38 | IF(DPHI.LE.0.0) DPHI=DPHI+360.0 | |
39 | IF(DPHI.GE.360.0) GO TO 10 | |
40 | C | |
41 | SAF=R | |
42 | SL=SIN(PHL) | |
43 | CL=COS(PHH) | |
44 | IF(SL*V(2)+CL*V(1).GT.0.0) SAF=ABS(SL*V(1)-CL*V(2)) | |
45 | C | |
46 | SAF2=R | |
47 | SH=SIN(PHH) | |
48 | CH=COS(PHH) | |
49 | IF(SH*V(2)+CH*V(1).GT.0.0) SAF2=ABS(SH*V(1)-CH*V(2)) | |
50 | C | |
51 | IF(SAF2.LT.SAF) SAF=SAF2 | |
52 | C | |
53 | 10 CONTINUE | |
54 | RETURN | |
55 | END |