Re: Math and bold font

[Hans Hagen <pragma@wxs.nl>]

On 3-12-2010 5:00, Procházka Lukáš Ing. - Pontex s. r. o. wrote:
> Hello,
>
> thanks for the example. I can see that:
>
> - In another font(s) (at least in cambria in your example) bold Greek
> chars are OK.
>
> - \bf in math mode causes chars to become "vertical", i.e. when I want
> to get slanted chars, I have to call \it or \sl or \bi explicitly. OK, I
> thought that the "slantedness" is kept by default when switching to bold
> in math mode, but no problem to switch to slanted/italics font manually.

In fact in math these are not font switches, but switches to a different 
alphabet.  In traditional tex that normally is afont switch so one gets 
the other bold or whatever shapes for free, given that they are in that 
font (so it's a side effect of the way math alphabets are implemented), 
but not so in open type math.

> - But I still have no idea how to "restore" Greek chars when using the
> *default* bold math font (i.e. when not using
> \setupbodyfont[<another-font>]. Or do I have to \setup???font[???]
> explicitly when I want to use Greek bold chars as well?

there is no default math font in mkiv: one uses regular math or bold 
math (given that there are two font(set)s available which is seldom the 
case) and within them gets bold or heavy alphabets (plus a few chars)

>> 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 :).

best try to convert to the unicode math approach: bold a-z is different 
unicode slots than a-z and in context the \bf command does that 
transformation on ascii a-z (you can also key in the official unicode 
chars); the benefit is that you can cut and paste the bold characters in 
pdf files i.e. you retain that property; a bold b is not a bold one in 
typographic sense but a special symbol that happens to use a bold 
rendering; in for instance a section title, one can have all math bold, 
and then this regular bold character will become real bold

Hans






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