Re: [NTG-context] OK, I Don't Quite Understand \definefontfamily

28 Sep 2020

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On Sep 28, 2020, at 12:39 PM, Wolfgang Schuster  wrote:
Michael Urban schrieb am 25.09.2020 um 21:12:
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I don't seem quite able to put it all together, forgive the question.
I have a 'Bookman' font setup, pretty vanilla:
\definetypeface [Bookman] [rm] [serif] [bonum] [sl=name:unituscndboldoblique]
\definetypeface [Bookman] [tt] [mono]  [modern] [default]
\definetypeface [Bookman] [ss] [sans] [unitus] [default]
\definetypeface [Bookman] [mm] [math] [modern] [default]
(Unitus is the fontsite 500 'Univers' substitute, works fine)
Now, the built-in gyre bonum font doesn't have a slanted/oblique variant, so if I have Bookman as my main body
font, \sl  produces (unsurprisingly) the same result as \it, TexGyreBonum-Italic.   If I want \sl to summon
Latin Modern for the variant, I have tried variations on
\definetypeface [Bookman] [rm] [serif] [bonum] [sl=file:Latin Modern Roman Slanted]
but to no avail — not helped by the fact that the \definetypeface contextgarden page doesn't have any pointer to just what that fifth
argument can contain.
https://wiki.contextgarden.net/Command/definetypeface
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How do I accomplish this?
Use \definefontfamily which is missing in your example.
\definefontfamily [Bookman] [rm] [TeX Gyre Bonum]
 [sl=features:{*,slanted},
  bs=features:{*,slanted}]
\definetypeface [Bookman] [mm] [math] [modern] [default]
\setupbodyfont [Bookman]
\starttext
\tf upright \it italic \sl slanted \bf bold \bi bolditalic \bs boldslanted
\stoptext
Wolfgang
Except that this does not work, because, as I said, the Gyre Bonum font has no builtin slanted version.  So, I want to use some other font (like Latin Modern) for a substitute for \sl .