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From: Hans Hagen <pragma@wxs.nl>
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Subject: Re: Is it possible to automatically determine font
	size	to fit text to a given space?
Date: Fri, 02 Dec 2005 15:02:54 +0100
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Daniel Pittman wrote:

>Hints about that, or a native TeX method[1], would be very much
>appreciated.  At the moment it is a relatively slow process of manual
>trial and error.
>  
>
this is something tex is pretty good at and it runs as fast as normal

how does your current code look? (the solution depends a bit it); think 
of something

\doloop{
  \setbox\scratchbox=\vbox
     {the content of the label}
   \ifx\ht\scratchbox>10cm
       \switchtobodyfont[small] 
   \else
       \unvbox\scratchbox
       \exitloop
   \fi
}

Hans