Re: [OS X TeX] Default rule thickness

[Oliver Buerschaper <oliver.buerschaper@mpq.mpg.de>]

> Sorry I missed this thread earlier. The default rule thickness in
> is the eight font parameter of the fonts in math family 3. A bare
> context file with the standard 12pt fonts gives the value 0.47998pt.
> You can get the value via :
>
>   \edef\defautlrulethickness{\the\fontdimen8\textfont3}
>
> Afaik, in all math setups three fonts in math family 3 are the same
> actual font so just the one value will do. But the actual value
> will definately vary a bit depending on the font setup. For example,
> palatino 12pt has 0.708pt.


OK. However, this doesn't seem to scale properly within the same font  
… try the following:

---
\edef\defaultrulethickness{\the\fontdimen8\textfont3}


\starttext

Lorem ipsum dolor sit amet \defaultrulethickness

\startformula
     \sum_{n=0}^\infty \frac{x^n}{n!}
\stopformula

\setupbodyfont[32pt]

Lorem ipsum dolor sit amet \defaultrulethickness

\startformula
     \sum_{n=0}^\infty \frac{x^n}{n!}
\stopformula

\stoptext
---

So, your font parameter always returns the same value but clearly the  
fraction bar is scaled correctly … something else must be happening  
behind the curtain. If only I knew what it were ;-)

Oliver
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