On 8/9/2016 10:41 PM, Mohammad Hossein Bateni wrote:
Hello,
I have a bunch of simple fonts for Arabic/Persian. These fonts lack
Latin characters, etc., so I use fallbacks to work with them.
I just noticed that \high does not work with them, and have not been
able to pinpoint the issue. See the MWE below.
\starttypescript [serif][samim][name]
\definefontsynonym[Serif][Samim]
\stoptypescript
\definetypeface [myfont][rm] [serif][samim][default]
\setupbodyfont [myfont]
\starttext
%\definedfont[Samim*arabic]
۱۲۳\high{۴}۵۶.
\stoptext
I am using Persian digits because the font lacks Latin digits as I
mentioned. If I use the \definedfont approach, I don't see the
character ۴ (argument of \high) at all. With the typescript approach,
the same character /is/ typeset but is /not/ raised; it appears on the
baseline but with smaller size.
Any ideas why this is happening? Could it be that some parameters, for
instance, \exheight are not properly set/read for this font? Actually,
I looked at the non-math fontdimens in syst-fnt.mkiv, and everything
except \slantperpoint (expected) and \exheight (awkward) is non-zero. I
don't know where \exheight comes from—perhaps from the height of glyph
for 'x', which the font lacks—however, \emheight is 12pt, although the
font also lacks a glyph for 'm'.
I am also attaching the font in case that helps.
Normally one sets up a proper bodyfont (and environment if needed) while
you use just a simple font switch and that one is unrelated to any other
font setting.
I'll add two new commands: \sx and \sxx so that you can say:
\setuplow [style=\sx]
\setuphigh[style=\sx]
for such cases. However, as these are derived relative scales they are
normally not compatible with \tx and txx sizes.
Hans
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