Re: switching to a different math font (with alternatives) in the middle of document

[Hans Hagen <pragma@wxs.nl>]

On 10-5-2012 10:25, Mojca Miklavec wrote:
> On Thu, May 10, 2012 at 10:02 AM, Hans Hagen wrote:
>> On 10-5-2012 02:25, Mojca Miklavec wrote:
>>>
>>> Hello,
>>>
>>> I'm just wonderding if there is a way to switch to an OpenType Math
>>> font (referred to by name or filename, without any predefined
>>> typescript) with some stylistic alternative in the middle of the
>>> document, like in the LaTeX example:
>>
>>
>> Sure, when Khaled added alternates to xits we also added support for it to
>> mkiv.
>>
>> \setupbodyfont[xits]
>
> But this requires a whole typescript. So there is no way to say

Why? It's a dynamic feature. It's just that we use nicer names than ss01 
and such.

> something equivalent to
>      \font\a=Asana-Math.otf \a
> without the need to create a lfg file&  so on?

I'm not sure what you mean here. You can use \font directly but it has 
no benefits as it's not part of a proper math setup then.

> Anyway, your example with Asana broke a compilation, so at least I was
> able to realize that I was missing the otf font, whereas yesterday it
> was simply ignoring the fact that the font was missing and has typeset
> everything in TeX Gyre I think.

I never used Asana.

>> \starttext
>>
>>     \unexpanded\def\mathaltcal{\mathalternate{cal}\cal}
>
> And how do I know what is an equivalent of StylisticSet=4 in Lucida?

Well, that's just ss04 but referring to a stylistic set at the user 
level is a bad idea as that's not standardized

> Would this be something like
>      italic = { feature = 'ss01', value = 1, comment = "Mathematical
> Alternative Italic" },

Indeed.

> where \mathalternate{italic} works as +ss01, but the ss04 not because
> it has not been defined in lucida-opentype-math.lfg?

Indeed, although of course I could make it honor the fuzzy ss01 etc 
variants too but no one can guarantee that these ss's always stay the 
same. In principle we can even define commands automatically if needed 
but then switching to a different font setup in a document can result in 
unknown commands. After all, there can be 10 different alternate scripts 
in one font and zero in another.

>>     $ABC$
>>     $\cal ABC$
>>     $\mathalternate{cal}\cal ABC$
>>     $\mathaltcal ABC$
>>
>> \stoptext

Once the dust around math fonts has settled we might end up with some 
standardization in mkiv with respect to the tags used in the lfg files.

Hans

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