[NTG-context] Zigzag left margin with italics

[NTG-context] Zigzag left margin with italics

[Rik Kabel]

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In a paper I recently wrote I noticed some ugly zigzag alignment on the 
left margin of one paragraph (set with Libertinus) where a couple of 
book titles appeared at the start of the second and fourth lines. The 
following example demonstrates the issue.

    \definefontfeature [default]
                        [default]
                        [protrusion=quality,expansion=quality]
    \setupalign        [hz,hanging]

    \startbuffer
    Here is a line of text, the first sentence in the demonstration.\\
    {\em Then} the next sentence in the paragraph follows.\\
    You can see that the italic {\em T} appears to be a bit indented.\\
    {\em There } might be a way to shift it to the left that little bit.\\
    Perhaps a protrusion setting.\\
    {\em This} does appear to depend to on the font used. With Modern and\\
    Libertinus it is worse, with Times a bit better.
    \blank
    \stopbuffer

    \starttext
    Modern\\
    \getbuffer
    Times\\
    \setupbodyfont[times]
    \getbuffer
    Libertinus\\
    \setupbodyfont[libertinus]
    \getbuffer
    \stoptext

How can one set a small left-margin protrusion for the italic T and 
possibly other characters? I know it is a small issue, but once seen it 
is hard to un-see.

-- 
Rik

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

[Mikael Sundqvist]

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]

\setupalign[hz,hanging]

\showmakeup[line]

\showglyphs

\startbuffer
Here is a line of text, the first sentence in the demonstration.\\
{\em Then} the next sentence in the paragraph follows.\\
You can see that the italic {\em T} appears to be a bit indented.\\
{\em There } might be a way to shift it to the left that little bit.\\
Perhaps a protrusion setting.\\
{\em This} does appear to depend to on the font used. With Modern and\\
Libertinus it is worse, with Times a bit better.
\blank
\stopbuffer

\starttext
Modern\\
\getbuffer
Times\\
\setupbodyfont[times]
\getbuffer
TLibertinus\\
\setupbodyfont[libertinus]
\getbuffer
\stoptext

/Mikael

On Mon, Nov 4, 2024 at 2:34 AM Rik Kabel <ConTeXt@rik.users.panix.com> wrote:
>
> In a paper I recently wrote I noticed some ugly zigzag alignment on the left margin of one paragraph (set with Libertinus) where a couple of book titles appeared at the start of the second and fourth lines. The following example demonstrates the issue.
>
> \definefontfeature [default]
>                    [default]
>                    [protrusion=quality,expansion=quality]
> \setupalign        [hz,hanging]
>
> \startbuffer
> Here is a line of text, the first sentence in the demonstration.\\
> {\em Then} the next sentence in the paragraph follows.\\
> You can see that the italic {\em T} appears to be a bit indented.\\
> {\em There } might be a way to shift it to the left that little bit.\\
> Perhaps a protrusion setting.\\
> {\em This} does appear to depend to on the font used. With Modern and\\
> Libertinus it is worse, with Times a bit better.
> \blank
> \stopbuffer
>
> \starttext
> Modern\\
> \getbuffer
> Times\\
> \setupbodyfont[times]
> \getbuffer
> Libertinus\\
> \setupbodyfont[libertinus]
> \getbuffer
> \stoptext
>
> How can one set a small left-margin protrusion for the italic T and possibly other characters? I know it is a small issue, but once seen it is hard to un-see.
>
> --
> Rik
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / https://mailman.ntg.nl/mailman3/lists/ntg-context.ntg.nl
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> archive  : https://github.com/contextgarden/context
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> ___________________________________________________________________________________
___________________________________________________________________________________
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___________________________________________________________________________________

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

[Rik Kabel]

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On 2024-11-04 01:35, Mikael Sundqvist wrote:
> \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

That, of course, works (I would use 0.175 for Libertinus) but as you 
point out does not distinguish roman and italic.

Perhaps instead of protrusion there is something that can be done with 
the bounding box of specific characters.

-- 
Rik

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

[Wolfgang Schuster]

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

[Rik Kabel]

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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 = 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?

-- 
Rik


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

[Hans Hagen]

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

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
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[NTG-context] Re: Zigzag left margin with italics

[Rik Kabel]

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On 2024-11-04 12:54, Hans Hagen wrote:
> On 11/4/2024 6:39 PM, Rik Kabel wrote:
>>
>> 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
>
Can anyone provide a pointer to a goodie file where glyph boundaries are 
manipulated? I could not find anything relevant in the wiki, docs, or 
source.

-- 
Rik

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

[Wolfgang Schuster]

Hans Hagen schrieb am 04.11.2024 um 18:54:
> 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

A simple solution is to use \shapecorrection which moves the slanted 
glyphs closer the margins of the text block.

%%%% begin example
\setuppapersize[A5]

\startbuffer
H\crlf
{\it T}
\blank
H\crlf
{\shapecorrection[both]\it T}
\stopbuffer

\showframe

\starttext

\subject{Latin Modern}
\getbuffer

\setupbodyfont[times]
\subject{Times}
\getbuffer

\setupbodyfont[libertinus]
\subject{Libertinus}
\getbuffer

\stoptext
%%%% end example

Wolfgang
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