CERN Program Library Long Writeup W5013 - CERNLIB ...

Geant 3.16 GEANT User’s Guide DRAW120
Origin : P.Zanarini Submitted: 15.05.84
Revision : Revised: 10.12.93
Documentation : P.Zanarini
Draw a volume cut view
CALL GDRAWX
(CHNAME,CUTTHE,CUTPHI,CUTVAL,THETA,PHI,U0,V0,SU,SV)
CHNAME (CHARECTER*4) name of volume;
CUTTHE (REAL) θ angle of the line normal to the cut plane;
CUTPHI (REAL) φ angle of the line normal to the cut plane;
TETHA (REAL) viewing angle θ;
PHI (REAL) viewing angle φ;
U0 (REAL) u coordinate on the screen of the volume origin;
V0 (REAL) v coordinate on the screen of the volume origin;
SU (REAL) scale factor for u coordinates;
SV (REAL) scale factor for v coordinates.
Draws a cut view of the volume CHNAME with all its visible descendants, i.e. draws their intersection with
the cut plane normal to the axis given by the angles CUTTHE, CUTPHI at the distance CUTVAL from the
origin. The view point is defined by the angles THETA, PHI. U0, V0, SU, SV have the same meaning as
in GDRAW. These view parameters, as well as zoom parameters set by GDZOOM are copied in /GCDRAW/.
Attributes like colour, surface fill, line width, line style, visibility, etc. can be set by the GSATT routine for
CHNAME and its descendants [GEOM500].
CALL GDRAWC
(CHNAME,IAX,CUTVAL,U0,V0,SU,SV)
CHNAME
IAX
U0
V0
SU
SV
(CHARECTER*4) name of volume;
(INTEGER) axis of the cut (1=X, 2=Y, 3=Z);
(REAL) u coordinate on the screen of the volume origin;
(REAL) v coordinate on the screen of the volume origin;
(REAL) scale factor for u coordinates;
(REAL) scale factor for v coordinates.
This routine is a special case of the previous GDRAWX. Here the cut plane is normal to one of the main axes
(IAX) and placed at a distance CUTVAL from the origin. The view-point is along the same axis.
Fig. 11 gives an example of utilisation of GDAXIS, GDRAW and GDRAWX. Fig. 12 gives an example of use of
GDRAWC.
79 DRAW120 – 1