Re: Stixtwo spacing between upright integrals and lower limits

[Hans Hagen <pragma@wxs.nl>]

On 10/3/2017 9:40 PM, Mikael P. Sundqvist wrote:
> Dear Hans (and others),
> 
> In the tex stackexchange chat today we were discussing the stix two 
> fonts, and in particular the spacing between the integral sign and the 
> lower bound. It is known that this was way to big before (see 
> https://tex.stackexchange.com/q/327710/52406), but it seems that it is 
> still too big, at least if one uses the upright version. Judge yourself 
> from the example file at the end of this email (result attached).

well, normally i don't care too much about it as it's a font design 
property and a designers choice

> I made a bug report (see 
> https://sourceforge.net/p/stixfonts/tracking/95/) but Ulrike Fischer 
> said that it could take time to get it fixed, and that you Hans made a 
> fix for another bug (https://sourceforge.net/p/stixfonts/tracking/86/) 
> in the fontloader.
> 
> Can you do that for this one as well?
> 
> During the discussion Harald Hanche-Olsen came up with the following 
> "quick fix" for LuaLaTeX:
> 
> \usepackage{luatexbase,luacode}
> \begin{luacode}
> local patch_stixmath = function (fontdata)
>   if fontdata.psname == "STIXTwoMath"
>   then
>    
> fontdata.characters[983352]["italic"]=3*fontdata.characters[983352]["italic"]
>   end
> end
> luatexbase.add_to_callback
>   (
>    "luaotfload.patch_font",
>    patch_stixmath,
>    "change_stixmath"
>   )
> \end{luacode}
> 
> I don't know if this is the way to go, but I thought I should include it.

no it's not the way to go (in context) but i cannot speak for latex

> Best regards, Mikael
> 
> %%% TEST FILE %%%
> \setupbodyfont[stixtwo]
> 
> \setupmathematics[
> integral=nolimits,
> ]
> 
> \startTEXpage[offset=3bp]
> 
> With slanted integral:
> 
> \startformula
> \int_0^\pi \sin x\,dx=2.
> \stopformula
> 
> \setupmathematics[stylealternative={upright}]
> 
> With upright integral:
> 
> \startformula
> \int_0^\pi \sin x\,dx=2.
> \stopformula
> 
> \stopTEXpage

i'll add (hopefully robust) patch code to the goodie file

also, i noticed that there's more wrong with stix2 (i bet that that 
would not have happened if the font was made by the gyre folks as they 
have a bit more consistent workflow), so i added

% \enabletrackers[otf.preparing]
% \definefontfeature[mathextra][mathextra][fixitalics=true]

to the next beta, not enabled by default because one never knows what 
side effects occur

Hans




> 
> 
> 
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                                           Hans Hagen | PRAGMA ADE
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