/Helvetica-Bold findfont
10 scalefont
setfont
sets the font in your current graphics state
to be Helvetica-Bold. You have a limited choice in
general:
/Helvetica-Bold, /Helvetica, /Times-Roman, /Times-Oblique,
/Courier,
/Symbol are some of the possible names. A more complete list
is in the Reference Manual.
The next line in this fragment of code
scales the font's nominal height to be 10 of the current
units. Then finally the font at that scale is chosen to be the current font.
You must choose some font in order to get text displayed.
There is no default font choice.
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