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Subject: [NTG-context] Re: Zigzag left margin with italics
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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 =3D fonts.protrusions.classes
>> local vectors =3D fonts.protrusions.vectors
>>
>> classes.rik =3D {
>> =C2=A0=C2=A0=C2=A0=C2=A0 vector =3D 'rik',
>> =C2=A0=C2=A0=C2=A0=C2=A0 factor =3D 1,
>> }
>>
>> vectors.rik =3D table.merged (
>> =C2=A0=C2=A0=C2=A0=C2=A0 vectors.quality,
>> =C2=A0=C2=A0=C2=A0=C2=A0 {
>> =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [0x0054] =3D { 0.35, 0 }, -- T
>> =C2=A0=C2=A0=C2=A0=C2=A0 })
>>
>> \stopluacode
>>
>> \definefontfeature
>> =C2=A0=C2=A0 [default]
>> =C2=A0=C2=A0 [default]
>> =C2=A0=C2=A0 [protrusion=3Drik,expansion=3Dquality]
>
> Define a feature which sets only the custom protrusion values:
>
> \definefontfeature [rik] [protrusion=3Dquality]
>
> and create a new typeface where you apply the new feature to the=20
> italic/slanted style:
>
> \definefontfamily [riktimes] [rm] [TeX Gyre Termes]=20
> [sl=3Dfeatures:{default,rik}]
>
> Afterwards use \seupbodyfont[riktimes] to access the new typeface.
>
> Wolfgang
> _______________________________________________________________________=
____________=20
>

Looking a bit more, the problem is not protrusion but the bounding box.=20
Look at the left side of the italic T and W, and to a lesser degree C,=20
O, and Q, produced by the following.

    \usetypescript[libertinus]
    \setupbodyfont[libertinus]
    \starttext
    =C2=A6\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=C2=A6}\par
    =C2=A6\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=C2=A6}

    =C2=A6\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=C2=A6}\par
    =C2=A6\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}=C2=A6}
    \stoptext

This may be an issue for the font maintainer, but is there anything that=20
could be done within context?

--=20
Rik


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<html>
  <head>
    <meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3DUTF=
-8">
  </head>
  <body>
    <p><br>
    </p>
    <div class=3D"moz-cite-prefix">On 2024-11-04 10:55, Wolfgang Schuster
      wrote:<br>
    </div>
    <blockquote type=3D"cite"
      cite=3D"mid:db1b3baf-8dba-6f4a-8096-84b9c76f2cf9@gmail.com">Mikael
      Sundqvist schrieb am 04.11.2024 um 07:35:
      <br>
      <blockquote type=3D"cite">Hi,
        <br>
        <br>
        You can try this below (from test suite), but then, as you see,
        also
        <br>
        upright T will move out. Not sure how/if you can control that.
        <br>
        <br>
        \startluacode
        <br>
        <br>
        local classes =3D fonts.protrusions.classes
        <br>
        local vectors =3D fonts.protrusions.vectors
        <br>
        <br>
        classes.rik =3D {
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0 vector =3D 'rik',
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0 factor =3D 1,
        <br>
        }
        <br>
        <br>
        vectors.rik =3D table.merged (
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0 vectors.quality,
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0 {
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 [0x0054] =3D { 0.35, 0 }, --=
 T
        <br>
        =C2=A0=C2=A0=C2=A0=C2=A0 })
        <br>
        <br>
        \stopluacode
        <br>
        <br>
        \definefontfeature
        <br>
        =C2=A0=C2=A0 [default]
        <br>
        =C2=A0=C2=A0 [default]
        <br>
        =C2=A0=C2=A0 [protrusion=3Drik,expansion=3Dquality]
        <br>
      </blockquote>
      <br>
      Define a feature which sets only the custom protrusion values:
      <br>
      <br>
      \definefontfeature [rik] [protrusion=3Dquality]
      <br>
      <br>
      and create a new typeface where you apply the new feature to the
      italic/slanted style:
      <br>
      <br>
      \definefontfamily [riktimes] [rm] [TeX Gyre Termes]
      [sl=3Dfeatures:{default,rik}]
      <br>
      <br>
      Afterwards use \seupbodyfont[riktimes] to access the new typeface.
      <br>
      <br>
      Wolfgang
      <br>
_________________________________________________________________________=
__________
      <br>
    </blockquote>
    <p>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.</p>
    <blockquote>
      <p><font face=3D"monospace">\usetypescript[libertinus]<br>
          \setupbodyfont[libertinus]<br>
          \starttext<br>
=C2=A6\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=
}<br>
          {\it\recursestring\tf=C2=A6}\par<br>
=C2=A6\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=
}<br>
          {\recursestring=C2=A6}<br>
          <br>
=C2=A6\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=
}<br>
          {\WORD{\it\recursestring}\tf=C2=A6}\par<br>
=C2=A6\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=
}<br>
          {\WORD{\recursestring}=C2=A6}<br>
          \stoptext<br>
        </font><br>
      </p>
    </blockquote>
    <p>This may be an issue for the font maintainer, but is there
      anything that could be done within context?</p>
    <p>-- <br>
      Rik<br>
    </p>
    <p><br>
    </p>
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