On Fri, Jun 2, 2017 at 11:39 AM, Mathias Schickel
<m...@fa.uni-tuebingen.de> wrote:
> Hi Mikael,
>
> math fonts are a bit different from text fonts. This means that you need
> special methods to influence them. Because I once had a similar concern like
> you I asked Hans to implement a way to influence kerning in math fonts
> between certain glyphs. I have attached an lfg-file that shows how to use it.
>
> To enable a goodie file like the one attached you have to define your
> typescript like
>
> \starttypescript [\s!math][cambriaown][\s!all]
> \loadfontgoodies[cambriaown-math]
> \definefontsynonym[\s!MathRoman] [Cambria-Math]
>
> [\s!features={\s!math\mathsizesuffix},\s!designsize=\s!auto,\s!goodies=cambriaown-math]
> \stoptypescript
>
> I hope this helps!
>
> Best
> Mathias
>
>
>
>
>
>> Am 02.06.2017 um 10:59 schrieb Mikael P. Sundqvist <mic...@gmail.com>:
>>
>> Hi!
>>
>> Now that the bug with primes is fixed in ConTeXt, I wonder if there is
>> a way to change the kerning between certain characters in mathematics
>> (in case one is not happy with the output from the font)? After
>> reading in fonts-mkiv.pdf this is what I came up with:
>>
>> \startluacode
>> fonts.handlers.otf.addfeature {
>> name = "kerntest",
>> type = "kern",
>> data = {
>> [0x61] = { [0x62] = -150 }, -- a and b in text
>> [0x1d44e] = { [0x1d44f] = -150 }, -- mathematical italic small a and b
>> [0x02032] = { [0x00028] = -150 }, -- prime and left parenthesis
>> }
>> }
>> \stopluacode
>>
>> \definefontfeature[kerntest][kerntest=yes]
>>
>> \definefontfamily[lucidaopentype][rm][Lucida Bright OT]
>> \definefontfamily[lucidaopentype][mm][Lucida Bright Math OT]
>>
>> \setupbodyfont[lucidaopentype,10pt]
>>
>>
>> \startTEXpage[offset=3pt]
>> abba $abba f'(x)$
>>
>> \addff{kerntest}
>>
>> abba $abba f'(x)$
>>
>> I prefer $f'\mkern-3mu(x)$
>> \stopTEXpage
>>
>> The output is attached as a png file. As you see the kerning works as
>> expected in text mode, but not at all in math mode, even not for the a
>> and b (which I hope I entered correctly).
>>
>> Something like the third line is what I'm after, but not having to use
>> \mkern in all places. Is it possible?
>>
>> /Mikael
>>
>> PS: This is a cross post of the question
>> https://tex.stackexchange.com/q/372857/52406, where I got the
>> suggestion to ask on the list.
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Thank you very much for your reply, Mathias!
I'm not sure I get it, though. I find that there is already a file
lucida-opentype-math.lfg in the distribution.
Just experimenting, I added to this file an entry with kernpairs (see
below), to see if I could make a change with a and b (if I cannot
manage that, I don't see how I could get the prime and parenthesis
case to work).
%%% start of my new lucida-opentype-math.lfg
----- kern_250 = { bottomright = { { kern = -250 } }, force = true }
return {
name = "lucida-opentype-math",
version = "1.00",
comment = "Goodies that complement lucida opentype.",
author = "Hans Hagen",
copyright = "ConTeXt development team",
mathematics = {
alternates = {
italic = { feature = 'ss01', value = 1, comment =
"Mathematical Alternative Lowercase Italic" },
arrow = { feature = 'ss02', value = 1, comment =
"Mathematical Alternative Smaller Arrows" },
operator = { feature = 'ss03', value = 1, comment =
"Mathematical Alternative Smaller Operators" },
calligraphic = { feature = 'ss04', value = 1, comment =
"Mathematical Alternative Calligraphic Characters" },
zero = { feature = 'ss05', value = 1, comment =
"Mathematical Alternative Zero" },
partial = { feature = 'ss20', value = 1, comment =
"Mathematical Alternative Upright Partial Differential" },
},
-- kerns = {
-- [0x1D449] = kern_250, --
-- [0x1D44A] = kern_250, -- 𝑊
-- },
kernpairs = {
[0x1D44E] = { -- a
[0x1D44F] = -200,} -- b
},
dimensions = {
default = { -- experimental values
[0x2044] = { xoffset = 275, width = 600 },
-- [0x2032] = { yoffset = -10 },
},
},
},
}
%%% end of lucida-opentype-math.lfg
but in the output of
\setupbodyfont[lucidaot,10pt]
\startTEXpage[offset=3pt]
$ab$
\stopTEXpage
I see no changes in the spacing between a and b.
Any ideas?
/Mikael
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