weird behavior of font.feature.effect

weird behavior of font.feature.effect

[Sylvain Hubert]

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Dear List,

I'm confused by the result of the following example (see attached):

    \definefontfamily[face1][rm][gabriola][it={features:{default}}]
    \definefontfamily[face2][rm][gabriola][it={features:{default,
effect={}}}]
    \definefontfamily[face3][rm][gabriola][it={features:{default,
effect={width=1.0}}}]
    \starttext

    \startitemize[n, packed]
    \item \switchtobodyfont[face1]\it\dorecurse{100}{a b c }
    \item \switchtobodyfont[face2]\it\dorecurse{100}{a b c }
    \item \switchtobodyfont[face3]\it\dorecurse{100}{a b c }
    \stopitemize

    \stoptext

Could someone explain:
1. What does "effect" mean? Why does "effect={}" embolden the fonts even
though nothing ({}) is given as arguments?
2. Similarly, what does "width" do? Why does "width=1.0" shrink the width
of the line instead of doing nothing?

Thanks in advance.

Best,
Sylvain

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Re: weird behavior of font.feature.effect

[Pablo Rodriguez]

On 11/8/20 12:57 AM, Sylvain Hubert wrote:
> Dear List,
>
> I'm confused by the result of the following example (see attached):
>
>     \definefontfamily[face1][rm][gabriola][it={features:{default}}]

Hi Sylvain,

this is the same as:

  \definefontfamily[face1][rm][gabriola]

Just in case, "slanted" is an already defined feature. It slants the font.

>     \definefontfamily[face2][rm][gabriola][it={features:{default,
> effect={}}}]
>     \definefontfamily[face3][rm][gabriola][it={features:{default,
> effect={width=1.0}}}]

BTW, the documentation is clear
(http://texdoc.net/texmf-dist/doc/context/presentations/bachotex/2018/bachotex-2018-fonteffects.pdf#search=fontfeature):
font features should be defined as such before being deployed.

> Could someone explain:

I will try from what I understand.

> 1. What does "effect" mean?

A ConTeXt (and not OpenType) font feature?

> Why does "effect={}" embolden the fonts even though nothing ({}) is
> given as arguments?
"effect={}" may be reading default values (it might be intended behavior
or not).

But it also could be reading or calculating from previously defined values.

> 2. Similarly, what does "width" do? Why does "width=1.0" shrink the
> width of the line instead of doing nothing?

This might be a bug, because of all the code improvements.

I’m reporting a proper bug.

Pablo
--
http://www.ousia.tk
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Re: weird behavior of font.feature.effect

[Sylvain Hubert]

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On Sun, 8 Nov 2020 at 11:24, Pablo Rodriguez <oinos@gmx.es> wrote:

> Hi Sylvain,
>
> this is the same as:
>
>   \definefontfamily[face1][rm][gabriola]
>
> Just in case, "slanted" is an already defined feature. It slants the font.
>
> >     \definefontfamily[face2][rm][gabriola][it={features:{default,
> > effect={}}}]
> >     \definefontfamily[face3][rm][gabriola][it={features:{default,
> > effect={width=1.0}}}]
>
> BTW, the documentation is clear
> (
> http://texdoc.net/texmf-dist/doc/context/presentations/bachotex/2018/bachotex-2018-fonteffects.pdf#search=fontfeature
> ):
> font features should be defined as such before being deployed.
>
> > Could someone explain:
>
> I will try from what I understand.
>
> > 1. What does "effect" mean?
>
> A ConTeXt (and not OpenType) font feature?
>
> > Why does "effect={}" embolden the fonts even though nothing ({}) is
> > given as arguments?
> "effect={}" may be reading default values (it might be intended behavior
> or not).
>
> But it also could be reading or calculating from previously defined values.
>
> > 2. Similarly, what does "width" do? Why does "width=1.0" shrink the
> > width of the line instead of doing nothing?
>
> This might be a bug, because of all the code improvements.
>
> I’m reporting a proper bug.
>

Thank you very much for the explanation and the bug report!

Just in case it helps: the line shrinking disappears with an additional
"delta=0":

    \definefontfamily[face3][rm][gabriola][it={features:{default,
effect={width=1.0, delta=0}}}]

Sylvain

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___________________________________________________________________________________

Re: weird behavior of font.feature.effect

[Wolfgang Schuster]

Sylvain Hubert schrieb am 08.11.2020 um 13:02:
> On Sun, 8 Nov 2020 at 11:24, Pablo Rodriguez <oinos@gmx.es 
> <mailto:oinos@gmx.es>> wrote:
> 
>     Hi Sylvain,
> 
>     this is the same as:
> 
>        \definefontfamily[face1][rm][gabriola]
> 
>     Just in case, "slanted" is an already defined feature. It slants the
>     font.
> 
>      >     \definefontfamily[face2][rm][gabriola][it={features:{default,
>      > effect={}}}]
>      >     \definefontfamily[face3][rm][gabriola][it={features:{default,
>      > effect={width=1.0}}}]
> 
>     BTW, the documentation is clear
>     (http://texdoc.net/texmf-dist/doc/context/presentations/bachotex/2018/bachotex-2018-fonteffects.pdf#search=fontfeature):
>     font features should be defined as such before being deployed.
> 
>      > Could someone explain:
> 
>     I will try from what I understand.
> 
>      > 1. What does "effect" mean?
> 
>     A ConTeXt (and not OpenType) font feature?
> 
>      > Why does "effect={}" embolden the fonts even though nothing ({}) is
>      > given as arguments?
>     "effect={}" may be reading default values (it might be intended behavior
>     or not).
> 
>     But it also could be reading or calculating from previously defined
>     values.
> 
>      > 2. Similarly, what does "width" do? Why does "width=1.0" shrink the
>      > width of the line instead of doing nothing?
> 
>     This might be a bug, because of all the code improvements.
> 
>     I’m reporting a proper bug.
> 
> 
> Thank you very much for the explanation and the bug report!
> 
> Just in case it helps: the line shrinking disappears with an additional 
> "delta=0":
> 
>      \definefontfamily[face3][rm][gabriola][it={features:{default, 
> effect={width=1.0, delta=0}}}]


Don't set the values within \definefontfamily:

\definefontfeature [myfeature] [effect={width=1.0, delta=0}]

\definefontfamily[face3][rm][gabriola][it={features:{default,myfeature}}]

Wolfgang
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