Re: how to convert font size to pt number ?

[Aditya Mahajan <adityam@umich.edu>]

On Sat, 12 Jul 2008, Alan Stone wrote:

> Thanks for your quick response Aditya.
>
> I've read that too and unfortunately don't find anything on that page that
> answers my question.
>
> Hmmm...
>
> Either the question was not clear enough or I've been smoking the carpet...
> :O)

I wanted to say that by default, \tfa = 1.2 times \tf size, tfb is 1.44 
times \tf size, tfc = 1.728 times \tf size, tfd = 2.074 times \tf size, 
and tfe = 2.488 times \tf size. So you can always use

(in a 10 point document)

\definefont[chapterfont][Sans sa 1.728]
\setuphead[chapter][style=chapterfont]


> Let's try to formulate it otherwise...
>
> With somefont defined through \definetypeface[somefont][...]
>
> style={\switchtobodyfont[somefont,huge]} gives a compile error,
> only, for example, style={\switchtobodyfont[somefont,14pt]} works
>
> like in \setuphead[chapter][style={\switchtobodyfont[somefont,14pt]}]
>
> I don't want to manually input some pt size but, for example, the \tfc or
> huge corresponding pt size.
>
>
>
> Therefore I'm looking for
>
> - the ConTeXtMagicCommand to convert
> \ConTexTMagicCommand[\tfc or huge] to "\tfc or huge size expressed in pt"
>
> or
>
> - some other ConTeXtSuperMagic trick to display the chapter heading in
> somefont and \tfc or huge size


The default values of \tfa etc can be changed by \definefont. If these 
values have not been changed, then you can use:

\definefont[chapterfont][Sans sa \magfactor3]
\setuphead[chapter][style=chapterfont]

\magfactor is defined in font-ini.tex as

\def\magfactor#1%
   {\ifcase#1 1.000\or1.200\or1.440\or1.728\or2.074\or2.488\or1\fi}

so \magfactor 3 is equal to \tfc in size. You can also use a more plain 
TeX like syntax as

\definefont[chapterfont][Sans scaled \magstep3]

where \magstep is defined in font-ini.tex as

\def\magstep#1%
   {\ifcase#1 \@m\or1200\or1440\or1728\or2074\or2488\or\@m\fi}



Aditya
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