Oddity: \buildtextaccent shifts glyph right

Oddity: \buildtextaccent shifts glyph right

[Rik]

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I am using \buildtextaccent to create a couple of characters that have 
no Unicode equivalent. They are scribal abbreviations that made it into 
early typesetters works. In this case, the abbreviation are for Latin 
que, which looks like a q with a small ezh appended in a subscript 
position, and q with an acute accent, both of which are used in some 
17th century works I am dealing with. An example of the abbreviation 
with the ezh and accent can be seen at 
https://books.google.com/books?id=hHNVAAAAcAAJ&pg=PA6#v=onepage&q&f=false in 
the sixth line of the paragraph beginning “Yea but”.

It seems that \buildtextaccent\textacute q (or \buildtextaccent´q) moves 
the q to the right within the character’s bounding box. The following 
example (and attached resulting pdf) demonstrates this. Lines 1 and 2 
show the string with and without the \buildtextaccent, and lines 4 and 6 
repeat that in italic.  The strings are the same width, but the q is 
moved right. Lines 3 and 6 show a manual kerning of the q to improve 
appearance.

This happens with many fonts, but not all (I do not see it with Computer 
Modern). I am using Win 10Pro x64 with ConTeXt  ver: 2015.09.04 11:00 
MKIV beta  fmt: 2015.9.5  int: english/english.

I suspect that this is not intended, but I am not sure.

I would also love to raise the accent a bit. Suggestions? I can live 
with it as it is and manually kern as needed. There are very few 
instances of these abbreviations that need to be dealt with.

    % macros=mkvi engine=luajittex

    \starttexdefinition boxWidth #STR
       \setbox0=\hbox{#STR}\the\wd0
    \stoptexdefinition

    \starttexdefinition Dicitque
       Dicitq\kern-0.070em\low{ʒ}\autoinsertnextspace
    \stoptexdefinition
    \starttexdefinition DicitqueK
       Dicit\buildtextaccent\textacute
    q\kern-0.070em\low{ʒ}\autoinsertnextspace
    \stoptexdefinition
    \starttexdefinition DicitqueKK
       Dicit\kern-0.060em\buildtextaccent\textacute
    q\kern-0.070em\low{ʒ}\autoinsertnextspace
    \stoptexdefinition

    \starttexdefinition idque
       idq\autoinsertnextspace
    \stoptexdefinition
    \starttexdefinition idqueK
       id\buildtextaccent\textacute q\autoinsertnextspace
    \stoptexdefinition
    \starttexdefinition idqueKK
       id\kern-0.060em\buildtextaccent\textacute q\autoinsertnextspace
    \stoptexdefinition

    \setupbodyfont[ebgaramond,12pt]

    \starttext
    \startitemize[n,joinedup,packed]
    \item \Dicitque \qquad\boxWidth{\Dicitque}\par
    \item \DicitqueK \qquad\boxWidth{\DicitqueK}\par
    \item \DicitqueKK \qquad\boxWidth{\DicitqueKK}\par
    \it
    \item \Dicitque \qquad\boxWidth{\Dicitque}\par
    \item \DicitqueK \qquad\boxWidth{\DicitqueK}\par
    \item \DicitqueKK \qquad\boxWidth{\DicitqueKK}\par
    \stopitemize
    \startitemize[n,joinedup,packed]
    \item \idque \qquad\boxWidth{\idque}\par
    \item \idqueK \qquad\boxWidth{\idqueK}\par
    \item \idqueKK \qquad\boxWidth{\idqueKK}\par
    \it
    \item \idque \qquad\boxWidth{\idque}\par
    \item \idqueK \qquad\boxWidth{\idqueK}\par
    \item \idqueKK \qquad\boxWidth{\idqueKK}\par
    \stopitemize
    \stoptext

-- 
Rik

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Re: Oddity: \buildtextaccent shifts glyph right

[Pablo Rodriguez]

On 09/06/2015 05:27 PM, Rik wrote:
> I am using \buildtextaccent to create a couple of characters that have
> no Unicode equivalent.

Hi Rik,

although they don’t seem to work as expected in ConTeXt, Unicode has
combining diacritical marks (as you might know), such as:

    U+0301 COMBINING ACUTE ACCENT

Just in case it might help,


Pablo


They are scribal abbreviations that made it into
> early typesetters works. In this case, the abbreviation are for Latin
> que, which looks like a q with a small ezh appended in a subscript
> position, and q with an acute accent, both of which are used in some
> 17th century works I am dealing with. An example of the abbreviation
> with the ezh and accent can be seen at
> https://books.google.com/books?id=hHNVAAAAcAAJ&pg=PA6#v=onepage&q&f=false in
> the sixth line of the paragraph beginning “Yea but”.
> 
> It seems that \buildtextaccent\textacute q (or \buildtextaccent´q) moves
> the q to the right within the character’s bounding box. The following
> example (and attached resulting pdf) demonstrates this. Lines 1 and 2
> show the string with and without the \buildtextaccent, and lines 4 and 6
> repeat that in italic.  The strings are the same width, but the q is
> moved right. Lines 3 and 6 show a manual kerning of the q to improve
> appearance.
> 
> This happens with many fonts, but not all (I do not see it with Computer
> Modern). I am using Win 10Pro x64 with ConTeXt  ver: 2015.09.04 11:00
> MKIV beta  fmt: 2015.9.5  int: english/english.
> 
> I suspect that this is not intended, but I am not sure.
> 
> I would also love to raise the accent a bit. Suggestions? I can live
> with it as it is and manually kern as needed. There are very few
> instances of these abbreviations that need to be dealt with.


-- 
http://www.ousia.tk
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Re: Oddity: \buildtextaccent shifts glyph right

[Thomas A. Schmitz]

On 06.09.2015 17:27, Rik wrote:
> It seems that \buildtextaccent\textacute q (or \buildtextaccent´q) moves
> the q to the right within the character’s bounding box. The following
> example (and attached resulting pdf) demonstrates this. Lines 1 and 2
> show the string with and without the \buildtextaccent, and lines 4 and 6
> repeat that in italic.  The strings are the same width, but the q is
> moved right. Lines 3 and 6 show a manual kerning of the q to improve
> appearance.

\buildtextaccent has to take some heuristics about horizontal and 
vertical placement and is sometimes wrong about it. Since your case is 
somewhat special, I would define a macro for the que symbol and adjust 
the boxes manually - but then, you'll have to adapt it to italic and 
upright (and bold) and different font sizes. Depends on how important 
typographical beauty is to you - either a medium-quality solution for 
all cases or better quality and manual fiddling... Something like

\definefontfamily [test] [serif] [ebgaramond]

\setupbodyfont [test,12pt]

\define\que%
   {\bgroup
    \setbox0\hbox{q}%
    \setbox2\hbox to \wd0{\kern0.3em\switchtobodyfont[6pt] ʒ}%
    \setbox4\hbox to \wd0{\kern0.1em\textacute}%
    \hbox to \wd0 \bgroup
      \hss\copy0\hss
      \hskip-\wd0
      \raise-0.45ex\copy2
      \hskip-\wd0
      \raise0.1ex\copy4
     \egroup
   \egroup\autoinsertnextspace}

\starttext

{\it Dicit\que mihi}

\stoptext

(btw, the example you sent uses Latin Modern).

Thomas
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Re: Oddity: \buildtextaccent shifts glyph right

[Rik]

On 2015-09-06 11:52, Pablo Rodriguez wrote:
> On 09/06/2015 05:27 PM, Rik wrote:
>> I am using \buildtextaccent to create a couple of characters that have
>> no Unicode equivalent.
> Hi Rik,
>
> although they don’t seem to work as expected in ConTeXt, Unicode has
> combining diacritical marks (as you might know), such as:
>
>      U+0301 COMBINING ACUTE ACCENT
>
> Just in case it might help,
>
>
> Pablo

On 2015-09-06 12:20, Thomas A. Schmitz wrote:
> \buildtextaccent has to take some heuristics about horizontal and 
> vertical placement and is sometimes wrong about it. Since your case is 
> somewhat special, I would define a macro for the que symbol and adjust 
> the boxes manually - but then, you'll have to adapt it to italic and 
> upright (and bold) and different font sizes. Depends on how important 
> typographical beauty is to you - either a medium-quality solution for 
> all cases or better quality and manual fiddling... Something like
>
> \definefontfamily [test] [serif] [ebgaramond]
>
> \setupbodyfont [test,12pt]
>
> \define\que%
>   {\bgroup
>    \setbox0\hbox{q}%
>    \setbox2\hbox to \wd0{\kern0.3em\switchtobodyfont[6pt] ʒ}%
>    \setbox4\hbox to \wd0{\kern0.1em\textacute}%
>    \hbox to \wd0 \bgroup
>      \hss\copy0\hss
>      \hskip-\wd0
>      \raise-0.45ex\copy2
>      \hskip-\wd0
>      \raise0.1ex\copy4
>     \egroup
>   \egroup\autoinsertnextspace}
>
> \starttext
>
> {\it Dicit\que mihi}
>
> \stoptext
>
> (btw, the example you sent uses Latin Modern).
>
> Thomas
>



Indeed, for the cases where there are combining accents that is a much 
better solution. I should have chosen a better example, that is, one 
that does not have a combining accent. Fortunately, there are very few 
that fall into that category, and unfortunately, there are some.

Using this, together with Thomas’s code, I can get around these issues.

Thank you both.

(And yes, I had attached the wrong example, and then referred to the 
font therein by the wrong name.)

-- 
Rik
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