[Xy-pic] Descent of displaymode

[Michael Barr]

That's exactly what I wanted.

Thanks, Michael

On Thu, 25 Oct 2007, Ross Moore wrote:

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