[Xy-pic] Descent of displaymode

[Ross Moore]

Hi Michael,


On 25/10/2007, at 6:25 AM, Michael Barr wrote:

> Is there any way of getting displaymode to descend into xy-pic?   
> Here is a
> sample file:
>
> \documentclass{article}
> \usepackage[arrow]{xy}
> \begin{document}
>
>  \[\xy
> \POS(0,0)*+!!<0ex,.55ex>{\prod_{i\in I}L_i}\ar@{>}
> (0,-20)*+!!<0ex,.55ex>{\prod_{j\in J}L_j}%
> \endxy\]
>
> \end{document}
>
> The subscripts look silly.  Of course, I write \prod\limits_{i\in I} 
> L_i,
> but that is a nuisance.  Is there any way of making that the  
> default.  Of
> course, I don't want \limits built-in, only for macros that  
> normally do it
> in displaymode.  It makes no difference, incidentally, if you use \ 
> [...\]
> or $$...$$.

Xy-pic sets everything inside an \hbox before placing it into the  
diagram.
(Otherwise it cannot control the exact positioning.)
So any outer specifications of \textstyle, \displaystyle,  
\scriptstyle, etc.
are quite irrelevant to the way objects are built.

Instead you can make adjustments to macros  \objectstyle  for <object>s
and  \labelstyle  for <label>s  on  <connection>s  (e.g. arrow and  
path-segments).

These are just ordinary TeX macros, so you can redefine them
using \def or \renewcommand, or simply  \let\objectstyle\displaystyle .

e.g., add this to your example:

\[\let\objectstyle\displaystyle
\xy
\POS(0,0)*+!!<0ex,.55ex>{\prod_{i\in I}L_i}\ar@{>}
(0,-20)*+!!<0ex,.55ex>{\prod_{j\in J}L_j}%
\endxy\]



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Cheers,

	Ross


PS.
Yes, this is mentioned within the Xy-pic Reference Manual.


>
> Michael
>
> _______________________________________________
> xy-pic mailing list
> http://tug.org/mailman/listinfo/xy-pic

------------------------------------------------------------------------
Ross Moore                                         ross at maths.mq.edu.au
Mathematics Department                             office: E7A-419
Macquarie University                               tel: +61 +2 9850 8955
Sydney, Australia  2109                            fax: +61 +2 9850 8114
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