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fe4da5cc | 1 | * |
2 | * $Id$ | |
3 | * | |
4 | * $Log$ | |
5 | * Revision 1.1.1.1 1995/10/24 10:19:45 cernlib | |
6 | * Geant | |
7 | * | |
8 | * | |
9 | #include "geant321/pilot.h" | |
10 | *CMZ : 3.21/02 29/03/94 15.41.32 by S.Giani | |
11 | *-- Author : | |
12 | SUBROUTINE CGTSET(N,T,IREP) | |
13 | ************************************************************************ | |
14 | * * | |
15 | * Name: CGTSET * | |
16 | * Author: E. Chernyaev Date: 31.07.88 * | |
17 | * Revised: * | |
18 | * * | |
19 | * Function: Set transformation to screen coordinates and * | |
20 | * find back transformation to world coordinates * | |
21 | * * | |
22 | * References: none * | |
23 | * * | |
24 | * Input: N - transformation number * | |
25 | * T(4,3) - transformation matrix * | |
26 | * * | |
27 | * Output: IREP - reply ( 0 - O.K. * | |
28 | * -1 - if illigal N, * | |
29 | * -2 - if DET(T)=0.) * | |
30 | * * | |
31 | * Errors: none * | |
32 | * * | |
33 | ************************************************************************ | |
34 | #include "geant321/cgctra.inc" | |
35 | REAL T(4,3) | |
36 | *- P A R A M E T E R S C H E C K | |
37 | IREP = 0 | |
38 | IF (N.LE.0 .OR. N.GT.NTMAX) IREP = -1 | |
39 | DET = T(1,1)*T(2,2)*T(3,3) - T(3,1)*T(2,2)*T(1,3) + | |
40 | + T(3,1)*T(1,2)*T(2,3) - T(1,1)*T(3,2)*T(2,3) + | |
41 | + T(2,1)*T(3,2)*T(1,3) - T(2,1)*T(1,2)*T(3,3) | |
42 | * IF (ABS(DET) .LT. 1./DELWOR) IREP = -2 | |
43 | IF (IREP .LT. 0) GOTO 999 | |
44 | * S E T T R A N S F O R M A T I O N M A T R I X | |
45 | DO 200 I=1,4 | |
46 | DO 100 J=1,3 | |
47 | TSCRN(I,J,N) = T(I,J) | |
48 | 100 CONTINUE | |
49 | 200 CONTINUE | |
50 | * F I N D M A T R I X F O R B A C K TRANSFORMATION | |
51 | TBACK(1,1,N) = (T(2,2)*T(3,3) - T(2,3)*T(3,2)) / DET | |
52 | TBACK(2,1,N) =-(T(2,1)*T(3,3) - T(2,3)*T(3,1)) / DET | |
53 | TBACK(3,1,N) = (T(2,1)*T(3,2) - T(2,2)*T(3,1)) / DET | |
54 | TBACK(4,1,N) =-(T(2,1)*T(3,2)*T(4,3) - T(4,1)*T(3,2)*T(2,3) + | |
55 | + T(4,1)*T(2,2)*T(3,3) - T(2,1)*T(4,2)*T(3,3) + | |
56 | + T(3,1)*T(4,2)*T(2,3) - T(3,1)*T(2,2)*T(4,3))/DET | |
57 | TBACK(1,2,N) =-(T(1,2)*T(3,3) - T(1,3)*T(3,2)) / DET | |
58 | TBACK(2,2,N) = (T(1,1)*T(3,3) - T(1,3)*T(3,1)) / DET | |
59 | TBACK(3,2,N) =-(T(1,1)*T(3,2) - T(1,2)*T(3,1)) / DET | |
60 | TBACK(4,2,N) = (T(1,1)*T(3,2)*T(4,3) - T(4,1)*T(3,2)*T(1,3) + | |
61 | + T(4,1)*T(1,2)*T(3,3) - T(1,1)*T(4,2)*T(3,3) + | |
62 | + T(3,1)*T(4,2)*T(1,3) - T(3,1)*T(1,2)*T(4,3))/DET | |
63 | TBACK(1,3,N) = (T(1,2)*T(2,3) - T(1,3)*T(2,2)) / DET | |
64 | TBACK(2,3,N) =-(T(1,1)*T(2,3) - T(1,3)*T(2,1)) / DET | |
65 | TBACK(3,3,N) = (T(1,1)*T(2,2) - T(1,2)*T(2,1)) / DET | |
66 | TBACK(4,3,N) =-(T(1,1)*T(2,2)*T(4,3) - T(4,1)*T(2,2)*T(1,3) + | |
67 | + T(4,1)*T(1,2)*T(2,3) - T(1,1)*T(4,2)*T(2,3) + | |
68 | + T(2,1)*T(4,2)*T(1,3) - T(2,1)*T(1,2)*T(4,3))/DET | |
69 | * | |
70 | 999 RETURN | |
71 | END |