Re: [NTG-context] Change kerning between math characters (prime and left parenthesis)

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 :

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. ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!

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