[NTG-context] Re: Zigzag left margin with italics

[Hans Hagen <j.hagen@xs4all.nl>]

On 11/4/2024 6:39 PM, Rik Kabel wrote:
> 
> On 2024-11-04 10:55, Wolfgang Schuster wrote:
>> Mikael Sundqvist schrieb am 04.11.2024 um 07:35:
>>> Hi,
>>>
>>> You can try this below (from test suite), but then, as you see, also
>>> upright T will move out. Not sure how/if you can control that.
>>>
>>> \startluacode
>>>
>>> local classes = fonts.protrusions.classes
>>> local vectors = fonts.protrusions.vectors
>>>
>>> classes.rik = {
>>>      vector = 'rik',
>>>      factor = 1,
>>> }
>>>
>>> vectors.rik = table.merged (
>>>      vectors.quality,
>>>      {
>>>        [0x0054] = { 0.35, 0 }, -- T
>>>      })
>>>
>>> \stopluacode
>>>
>>> \definefontfeature
>>>    [default]
>>>    [default]
>>>    [protrusion=rik,expansion=quality]
>>
>> Define a feature which sets only the custom protrusion values:
>>
>> \definefontfeature [rik] [protrusion=quality]
>>
>> and create a new typeface where you apply the new feature to the 
>> italic/slanted style:
>>
>> \definefontfamily [riktimes] [rm] [TeX Gyre Termes] [sl=features: 
>> {default,rik}]
>>
>> Afterwards use \seupbodyfont[riktimes] to access the new typeface.
>>
>> Wolfgang
>> ___________________________________________________________________________________
> 
> Looking a bit more, the problem is not protrusion but the bounding box. 
> Look at the left side of the italic T and W, and to a lesser degree C, 
> O, and Q, produced by the following.
> 
>     \usetypescript[libertinus]
>     \setupbodyfont[libertinus]
>     \starttext
>     ¦\doloopoverlist{a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}
>     {\it\recursestring\tf¦}\par
>     ¦\doloopoverlist{a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}
>     {\recursestring¦}
> 
>     ¦\doloopoverlist{a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}
>     {\WORD{\it\recursestring}\tf¦}\par
>     ¦\doloopoverlist{a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z}
>     {\WORD{\recursestring}¦}
>     \stoptext
> 
> This may be an issue for the font maintainer, but is there anything that 
> could be done within context?

you can make a font goodie file where you patch properties of a specific 
glyph but then you also need to keep an eye on when the font gets fixed

Hans

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                                           Hans Hagen | PRAGMA ADE
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