[Xy-pic] large arrow tips?
Peter Selinger
selinger at mathstat.dal.ca
Mon May 15 02:53:42 CEST 2006
Hi,
I would appreciate some help with the following problem.
When using Xy-pic with SliTeX, the various arrow heads don't scale
with the size of the font of the rest of the document. I tried using
the \SelectTips command to change their size, but this has no visible
effect.
How can I get larger arrow heads? The below file is a simple example.
On a slide show on an LCD projector, the arrow heads will be virtually
invisible to the audience, and in particular, the difference between A
and B will not be visible from the back of the room.
Note that the file below also includes the example from the Xy-pic
reference manual, section 10. However, for "family=cm" and
"family=eu", I can only change the "size" to 10,11,12, with the
changes in the output being almost imperceptible. Any larger size
leads to font errors. For "family=xy", the size is apparently ignored
entirely, as I don't get errors, and don't see any change in the
output.
Is there any way I can, say, double the size of the arrows?
Thanks, -- Peter
----------------------------------------------------------------------
\documentclass{slides}
\usepackage[all]{xy}
\xyoption{ps}
\xyoption{dvips}
\CompileMatrices
\SelectTips{xy}{30} % the second argument is useless
\UseTips
\begin{document}
\begin{slide}
\[
\let\labelstyle\objectstyle
\vcenter{\xymatrix{
A \ar@{-}[rr]^<>(.5){\rm id}
\ar@{}[rr]|<>(.5)/.3ex/{\dir2{>}}&&A
\\
B \ar@{-}[rr]^<>(.5){\rm id}
\ar@{}[rr]|<>(.5)/-.3ex/{\dir2{<}}&&B
\\
C \ar[r]^{f} & C
}}
\]
\[
\SelectTips{cm}{10}
\xy*{} \ar
@{*{\UseTips\dir_{<<}}-*{\UseTips\dir{>}}}
(20,5)*{} \endxy
\]
\end{slide}
\end{document}
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