[luatex] How to insert mathkerns?
Hans Hagen
j.hagen at xs4all.nl
Sat Sep 15 10:53:49 CEST 2018
On 9/15/2018 7:50 AM, Henri Menke wrote:
> Dear list,
>
> I'm trying to add mathkerns to a font on the fly. I adapted the code
> from ConTeXt in good-mth.lua but nothing happens. How can I make this
> work? MWE below.
> N.B. I'm using 1.09.0 svn6938 with Ulrike's fontloader 2018-09-01
>
> Cheers, Henri
>
> ---
>
> \input luaotfload.sty
> \directlua{
> function kern_right_fence(tfmdata)
> if tfmdata.mathparameters then
> local characters = tfmdata.characters
> if characters[0x1D44E] then % we have at least an italic a
> print("PATCHING FONT " .. tfmdata.psname)
> characters[0x1D453].mathkerns = {
> force = true,
> bottomright = { { kern = 1000 } },
> }
> end
> end
> end
> %
> luatexbase.add_to_callback("luaotfload.patch_font",
> kern_right_fence,
> "kern right fence")
> }
>
> \font\lmmath="Latin Modern Math:script=math;" at 10pt
> \textfont0=\lmmath
>
> \Umathcodenum`e="1D452
> \Umathcodenum`f="1D453
> \Umathcodenum`g="1D454
>
> $efg$
I don't know how the plugs in otfload work but it's more something like
characters[0x1D453].math =
{ kerns = { bottomright = { { kern = 1000 } } }
where of course you need to make sure that when there is already a math
table you add instead of replace; eventually that becomes something scaled
characters[0x1D453].mathkern.bottom_right = ...
don't confuse a higher level context interface with low level font
properties
Hans
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