CERN Program Library Long Writeup W5013 - CERNLIB ...

ITRA I “Track number” D=0
ISEL I “Option flag” D=11
SIZE R “Character size (cm) for particle names” D=0.25
CALL GDPART(itra,isel,size)
isel=x1 to drawthe track number
isel=1x to drawthe particle name
3.30 DHITS [ chuset chudet itra isymb ssymb ]
CHUSET C “User set identifier” D=’*’
CHUDET C “User detector identifier” D=’*’
ITRA I “Number of the selected track” D=0
ISYMB I “Character selection number” D=0
SSYMB R “Size of characters (cm)” D=0.1
CALL GDHITS(chuset,chudet,itra,isymb,ssymb). The character plotted at each hit point may be chosen by
isymb :
-1 (small) hardware points (fast)
0 software crosses (default)
840,850 empty/full circles (slow)
841,851 empty/full squares (slow)
842,852 empty/full triangles (up) (slow)
843,853 empty diamond/full triangle (down) (slow)
844,854 empty/full stars (slow)
Except for isymb=-1, the size of the character on the screen can be chosen by SSYMB cm. The hit
colour will follow the value of TXCI (text colour) for isymb〉0, the value of PMCI (polymarkers colour)
for isymb〈0, the value of PLCI (polyline colour) for isymb=0.
3.31 KHITS [ chuset chudet epsilo ]
CHUSET C “User set identifier” D=’*’
CHUDET C “User detector identifier” D=’*’
EPSILO R “Pick aperture” D=0.1
CALL GKHITS(chuset,chudet,epsilo)
The picking of hit points requires the appropriate JSET data structure have been filled and is repeated until
the character typed is ’Q’ or ’q’ (GKS) or the right button of the mouse is clicked (X11). If the character
typed to pick is ’K’ or ’k’ then the kinematics of the corresponding track is also printed. The search is made
of all the hits of all tracks in detector CHUDET of set CHUSET. EPSILO is the pick aperture; if EPSILO〈0
its absolute value is taken and in addition the pick aperture is drawn; if EPSILO=0 there is an infinite pick
aperture and over all the hits the one nearest to the pick point is taken.
3.32 DCHIT [ chuset chudet itra isymb sizmax ihit hitmin hitmax ]
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