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
cambriaown-math.lfg
Description: Binary data
> 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. > <ctx-example20.png>___________________________________________________________________________________ > If your question is of interest to others as well, please add an entry to the > Wiki! > > maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context > webpage : http://www.pragma-ade.nl / http://context.aanhet.net > archive : https://bitbucket.org/phg/context-mirror/commits/ > wiki : http://contextgarden.net > ___________________________________________________________________________________
___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : http://contextgarden.net ___________________________________________________________________________________