Re: Math and bold font

[Vladimir Lomov <lomov.vl@gmail.com>]

Hi.

** Procházka Lukáš Ing. - Pontex s. r. o. [2010-12-03 08:51:41 +0100]:

> Hello all,
> 
> I'd to explain some effects in the .pdf from the code bellow. It was copied from co-font.pdf, pg. 19-20; just "Abc" was added to try something.
> 
> ---
> \enableregime[cp1250]
> 
> \starttext
>   $Abc\sqrt{625}=5\alpha$
>   $\bf Abc\sqrt{625}=5\alpha$
>   $Abc\sqrt{625}=\bf5\alpha$
>   $\bfmath Abc\sqrt{625}=5\alpha$
> 
>   \definetypeface[whow][mm][math,boldmath][modern][default]%[encoding=texnansi]
>                                                            []
> 
>   $Abc\sqrt{625}=5\alpha$
>   $\bf Abc\sqrt{625}=5\alpha$
>   $Abc\sqrt{625}=\bf5\alpha$
>   $\bfmath Abc\sqrt{625}=5\alpha$
> 
>   \usetypescriptfile[typeface]
> 
>   $Abc\sqrt{625}=5\alpha$
>   $\bf Abc\sqrt{625}=5\alpha$
>   $Abc\sqrt{625}=\bf5\alpha$
>   $\bfmath Abc\sqrt{625}=5\alpha$
> \stoptext
> ---
> 
> Things I cannot do or understand:
> 
> - The "alpha" symbol is not printed as soon as it's used in \bf or \bfmath mode (lines 2-4 in each paragraph). Why? How to make it appear?
> 
> - - The same effect may be observed in the co-fonts.pdf at the pg. 19 at the lowest line - there is bold font working, but "alpha" is missing as well.
> 
> - - - Unfortunately, there is no fully working example in the document with bold math and "alpha" together.
> 
> - In my example, normal (thin) "Abc" is shown a bit slanted (as should be in math mode). Once it is used in bold math mode, it's no more slanted but "vertical" as normal text. Is there a way how to keep the "slantedness" even in math bold mode? (This is e.g. often used to mark vectors.)
> 
IMHO (I'm not expert in context) this depends on used fonts. See for
example follwoing:
<example file="ex1.tex">
\setupbodyfont[cambria]

\starttext

This is a test.

$a=\alpha$

$\bf a=\alpha$

$\bi a=\alpha$

\stoptext
</example>

BTW, I not sure if I use "correct" way to switch fonts in math mode (in
LaTeX commands to switch fonts are different in text and math mode, and
I have big LaTex background, so for me this way is unusual :).

P.S. My example works with mkiv but not with mkii. The last uses
"default" fonts that don't have bold variant for greek letters (I could
be wrong here, for LaTeX I have to redefine commands for greek letters
because there is appropriate font but greek letters are defined in a
way so nobody could use bold variant by default).


---
WBR, Vladimir Lomov

-- 
Avoid reality at all costs.
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