CERN Program Library Long Writeup W5013 - CERNLIB ...

Geant 3.16 GEANT User’s Guide DRAW399
Origin : R.Brun, P.Zanarini Submitted: 15.11 83
Revision : Revised: 13.12.93
Documentation :
The data structure JDRAW
This data structure contains the so-called view banks. The layout of the data structure can be found in
Fig. 18. The meaning of the variables is the following:
NKVIEW
IVIEW
IGU
MAXGU
MORGU
IGS
MAXGS
MORGS
ITU
MAXTU
MORTU
ITS
MAXTS
MORTS
LENGU
ADDGU
ADDTU
X
Y
ICUT
LINWID
number of views stored in the structure;
current view selected;
current graphic unit pointer;
number of units in graphic unit bank;
number of words to push the graphic unit bank;
current graphic segment pointer;
number of segments in graphic segment bank;
number of words to push the graphic segment bank;
current text unit pointer;
number of units in text unit bank;
number of words to push the text unit bank;
current text segment pointer;
number of segments in text segment bank;
number of words to push in text segment bank
array of lengths for each graphic unit and of line attributes (LINATT);
array of addresses for each graphic unit;
array of addresses for each text unit;
array of u coordinates of graphic segments;
array v coordinates of graphic segments;
cut axis (1, 2, 3 or 0 if no cut) of the view;
text line width and text attributes (ITXATT);
GTHETA, GPHI, GPSI, GU0, GV0, GSCU, GSCV, are the viewing parameters stored in /GCDRAW/.
U0, V0, SIZE, ANGLE, IOPT, ITEXT have the same meaning of those given as arguments to GDRAWT
(or HPLSOF [7]).
A control word is stored in Q(JDRAW+IVIEW), with the following meaning:
1 empty bank (created by internal routines to avoid gaps) or for deleted banks;
2 bank created by the user;
3 protected bank reserved for internal use: it cannot be deleted by the user.
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