3.4 Constants and Layout Variables
gap-size : 24
A width commonly used for layout.
A filled bullet used by default by item.
It is either (t "•"), if that character is available in the font that t uses, or it uses an implementation similar to o-bullet, but not hollow (using disk, not circle).
A hollow bullet used by default by subitem.
It’s implementation is:
Produces the width of the display area, minus margins. The
result of the form changes if the margin is adjusted via
set-margin!.
Produces the height of the display area, minus margins, but
including the title area). The result of the form changes if the
margin is adjusted via set-margin!.
Produces an empty pict that is the same size as the client area, which
is like (blank client-w client-h).
Produces an empty pict that is the same size as the client area minus
the title area in 'top layout mode, which is like
(blank client-w (- client-h title-h (* 2 gap-size))).
Produces a number that corresponds to the current margin, which
surrounds every side of the slide. The client area for a slide
corresponds to the display area (which is always 1024 by 768) minus
this margin on each side. The default margin is 20.
The margin can be adjusted via set-margin!.
Produces a number that corresponds to the height of a title created by
titlet.
If titlet is changed via the current-titlet parameter, the title height should be updated via set-title-h!.
The value is #t if slides are being generated for printed
output, #f for normal on-screen display. Printing mode is
normally triggered via the --print or --ps command-line
flag.
The value is #t if slides are being generated in condensed
mode, #f for normal mode. Condensed mode is normally
triggered via the --condense command-line flag.