[Xy-pic] Rectangular frames (Was: Modifying one dimension of a box)

Alexander Perlis alexanderperlis@yahoo.com
Mon, 21 Oct 2002 20:22:05 -0700 (PDT)

--- Ross Moore <ross@ics.mq.edu.au> wrote:
> [...] the most determining factor is the fact that the Xy-pic
> fonts can only produce circles at specific radii. There is
> necessarily a rounding to one of these specific sizes.

That must be the correct explanation. I tried a few different sizes,
and sometimes the circle agreed better with the square, other times
worse. I retract my claim about inside versus outside framing.

Concerning bad corners in the framing of rectangles: my complaints
concern the non-PostScript situation. As far as I can tell, \UseRules
and \NoUseRules does *not* affect the framing of rectangles. Either
way, the frame appears to be made partially with rules (for vertical
lines) and partially with fonts (for horizontal lines). This is not
good: since the line font has round-capped ends, the corners of a
rectangular frame are messed up. (The situation is further aggravated
by a small miscalculation, turning the right-hand corners into gaping
holes.) I can see the problem quite easily in xdvi and on a dvips
preview and/or printout. So two different DVI drivers show the

For an example, take the code below. Magnify the output in your DVI
previewer or try printing it. All four corners are distinct. Top-left
is best, bottom-right is worst.

% Let's	exaggerate the problem:
\xy *=<4ex>[][F-]{} \endxy

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