space in \longrightarrow in lucida (mkiv)

space in \longrightarrow in lucida (mkiv)

[Mojca Miklavec]

Dear Hans,

maybe my request comes a bit late, but nevertheless - how difficult is
it to fix \longrightarrow in MKIV in Lucida font? (In MKII it works
fine.)

\setupbodyfont[lucida]

\starttext
$\longrightarrow$
\stoptext

The arrow has white space in the middle.

Thanks a lot,
    Mojca
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Re: space in \longrightarrow in lucida (mkiv)

[Herbert Voss]

Am 30.11.2010 17:54, schrieb Mojca Miklavec:

> \setupbodyfont[lucida]
> 
> \starttext
> $\longrightarrow$
> \stoptext
> 
> The arrow has white space in the middle.

in mkii \joinrel is \mkern-4mu in mkiv only \mkern-3mu


\setupbodyfont[lucida]
\def\longrightarrow{\relbar\mkern-4mu\rightarrow}

\starttext
$\longrightarrow$
\stoptext

Herbert
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Re: space in \longrightarrow in lucida (mkiv)

[Hans Hagen]

On 30-11-2010 6:23, Herbert Voss wrote:
> Am 30.11.2010 17:54, schrieb Mojca Miklavec:
>
>> \setupbodyfont[lucida]
>>
>> \starttext
>> $\longrightarrow$
>> \stoptext
>>
>> The arrow has white space in the middle.
>
> in mkii \joinrel is \mkern-4mu in mkiv only \mkern-3mu
>
>
> \setupbodyfont[lucida]
> \def\longrightarrow{\relbar\mkern-4mu\rightarrow}
>
> \starttext
> $\longrightarrow$
> \stoptext

ok, will be fixed


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                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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Re: space in \longrightarrow in lucida (mkiv)

[Mojca Miklavec]

On Tue, Nov 30, 2010 at 19:16, Hans Hagen wrote:
> On 30-11-2010 6:23, Herbert Voss wrote:
>>
>> in mkii \joinrel is \mkern-4mu in mkiv only \mkern-3mu
>>
>>
>> \setupbodyfont[lucida]
>> \def\longrightarrow{\relbar\mkern-4mu\rightarrow}
>>
>> \starttext
>> $\longrightarrow$
>> \stoptext
>
> ok, will be fixed

Hans,

this issues is not fixed. I assume that jointwo(...) function is used
to create the longrightarrow and maybe that one doesn't get the
spacing right.

Thanks,
    Mojca
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Re: space in \longrightarrow in lucida (mkiv)

[Mojca Miklavec]

On Fri, Dec 3, 2010 at 11:42, Mojca Miklavec wrote:
>
> Hans,
>
> this issues is not fixed. I assume that jointwo(...) function is used
> to create the longrightarrow and maybe that one doesn't get the
> spacing right.

This fixes the problem indeed:
    jointwo  (main,characters,id,size,0x27F6,0x0002D,4,0x02192)
(line 332 in math-vfu.lua). It seems that joinrel is hardcoded to the
value 3 in many places apart from this particular one. Maybe you need
to introduce a new lua variable somewhere inside function
vfmath.alas(main,id,size)?

Thanks,
    Mojca
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Re: space in \longrightarrow in lucida (mkiv)

[Herbert Voss]

Am 03.12.2010 12:21, schrieb Mojca Miklavec:
>> IIRC, the original definitions are from plain.tex and amstex.tex.
> 
> plain.tex says:
>     \def\joinrel{\mathrel{\mkern-3mu}}
> 
> So I guess that \joinrel indeed needs to be defined on per-font basis
> instead of being hardcoded into definitions.

the macro \loadfontgoodies in font-gds.mkiv should be extended
to something like

\def\loadfontgoodies[#1]%
  {\ctxlua{fonts.goodies.get("#1")}%
   \InputIfExists #1.tex%
  }

which already load a lucida-math.ldf (lua code)
and then an optional lucida-math.tex (tex code)

don't know how ConTeXt can handle the \InputIfExists
The file lucida-math.tex in /context/fonts/
gets all font specific redefinitions, in this case

\def\joinrel{\mkern-4mu}
\def\longrightarrow{\relbar\joinrel\rightarrow}
\def\longleftarrow{\leftarrow\joinrel\relbar}
...

sich files are then possible for all other fonts

Herbert
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Re: space in \longrightarrow in lucida (mkiv)

[Hans Hagen]

On 3-12-2010 2:47, Herbert Voss wrote:
> Am 03.12.2010 12:21, schrieb Mojca Miklavec:
>>> IIRC, the original definitions are from plain.tex and amstex.tex.
>>
>> plain.tex says:
>>      \def\joinrel{\mathrel{\mkern-3mu}}
>>
>> So I guess that \joinrel indeed needs to be defined on per-font basis
>> instead of being hardcoded into definitions.
>
> the macro \loadfontgoodies in font-gds.mkiv should be extended
> to something like
>
> \def\loadfontgoodies[#1]%
>    {\ctxlua{fonts.goodies.get("#1")}%
>     \InputIfExists #1.tex%
>    }
>
> which already load a lucida-math.ldf (lua code)
> and then an optional lucida-math.tex (tex code)
>
> don't know how ConTeXt can handle the \InputIfExists
> The file lucida-math.tex in /context/fonts/
> gets all font specific redefinitions, in this case
>
> \def\joinrel{\mkern-4mu}
> \def\longrightarrow{\relbar\joinrel\rightarrow}
> \def\longleftarrow{\leftarrow\joinrel\relbar}
> ....
>
> sich files are then possible for all other fonts

in mkii we had math vectors and one could have many different vectors 
active at the same time (so, lucida alongside lm and others); in mkiv we 
assume unicode math

I can probably make something for mkiv but the question is: is it worth 
the trouble and complication. Eventually all these math fonts will be 
open type anyway.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: space in \longrightarrow in lucida (mkiv)

[Hans Hagen]

On 3-12-2010 2:47, Herbert Voss wrote:
> Am 03.12.2010 12:21, schrieb Mojca Miklavec:
>>> IIRC, the original definitions are from plain.tex and amstex.tex.
>>
>> plain.tex says:
>>      \def\joinrel{\mathrel{\mkern-3mu}}
>>
>> So I guess that \joinrel indeed needs to be defined on per-font basis
>> instead of being hardcoded into definitions.
>
> the macro \loadfontgoodies in font-gds.mkiv should be extended
> to something like
>
> \def\loadfontgoodies[#1]%
>    {\ctxlua{fonts.goodies.get("#1")}%
>     \InputIfExists #1.tex%
>    }
>
> which already load a lucida-math.ldf (lua code)
> and then an optional lucida-math.tex (tex code)
>
> don't know how ConTeXt can handle the \InputIfExists
> The file lucida-math.tex in /context/fonts/
> gets all font specific redefinitions, in this case
>
> \def\joinrel{\mkern-4mu}
> \def\longrightarrow{\relbar\joinrel\rightarrow}
> \def\longleftarrow{\leftarrow\joinrel\relbar}
> ....
>
> sich files are then possible for all other fonts

In lucida-math.lfg there is now:

         variables = {
             joinrelfactor = 4, -- default is 3
         }

and when set that variable will be used in composing the virtual glyph 
(the default is 3). So, no complex defs are needed.  Maybe there are 
more relevant variables.

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
-----------------------------------------------------------------
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: space in \longrightarrow in lucida (mkiv)

[Mojca Miklavec]

On Sat, Dec 4, 2010 at 19:38, Hans Hagen wrote:
>
> In lucida-math.lfg there is now:
>
>        variables = {
>            joinrelfactor = 4, -- default is 3
>        }
>
> and when set that variable will be used in composing the virtual glyph (the
> default is 3). So, no complex defs are needed.  Maybe there are more
> relevant variables.

Great, thanks a lot, Hans! This is exactly what I wanted to suggest
(as it avoids complex situations with multiple definitions).

Mojca
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