Re: how to color italics?

[Steffen Wolfrum <context@st.estfiles.de>]

Am 22.09.2008 um 15:00 schrieb Hans Hagen:

> Taco Hoekwater wrote:
>>
>> Aditya Mahajan wrote:
>>> Ah, so that is why it is lowlevel. I wonder why the following does  
>>> not
>>> work.
>>>
>>> \setupbodyfontenvironment [default]
>>>                           [em={\italic\color[red]}]
>>
>> The em key is a bit extra extra special: it has to be either
>> 'italic' or 'slanted', everything else is ignored. This is because
>> of the need to allow bold emphasis. (\bf\em == \bs or \bi).
>>
>> I would personally be happier if it would just use whatever was
>> in the argument when it is *not* italic or slanted, instead of
>> ignoring the argument, but that's how it is.
>
>
> \def\doemphasistypeface#1#2%
>   {\doifelsevalue{\??ft\fontclass\normalizedbodyfontsize\c!em}\v! 
> slanted
>      {#1}%
>      {\doifelsevalue{\??ft\fontclass\normalizedbodyfontsize\c!em}\v! 
> italic
>         {#2}%
>         {\doifelsevaluenothing{\??ft\fontclass\normalizedbodyfontsize 
> \c!em}
>            {\doifelsevalue{\??ft\normalizedbodyfontsize\c!em}\v! 
> slanted
>               {#1}%
>               {\doifelsevalue{\??ft\normalizedbodyfontsize\c!em}\v! 
> italic
>                  {#2}%
>                  {\getvalue{\??ft\normalizedbodyfontsize\c!em}}}}
>            {\getvalue{\??ft\fontclass\normalizedbodyfontsize\c!em}}}}}
>
> however, this does not provide italic correction, so better is:
>
> \newtoks\everyemphasized
>
> \unexpanded\def\em
>   {\relax
>    \ifdim\slantperpoint>\zeropoint
>      \settrue\emneeded
>    \else
>      \setfalse\emneeded
>    \fi
>    \setemphasisboldface % new
>    \ifx\fontalternative\c!it      % \ifnum\fam=\itfam
>      \def\emphasistypeface{\it}\tf
>    \else\ifx\fontalternative\c!sl % \ifnum\fam=\slfam
>      \def\emphasistypeface{\sl}\tf
>    \else\ifx\fontalternative\c!bf % \ifnum\fam=\bffam
>      \emphasisboldface
>    \else\ifx\fontalternative\c!bs % \ifnum\fam=\bsfam
>      \def\emphasisboldface{\bs}\bf
>    \else\ifx\fontalternative\c!bi % \ifnum\fam=\bifam
>      \def\emphasisboldface{\bi}\bf
>    \else
>      \emphasistypeface
>    \fi\fi\fi\fi\fi
>    \the\everyemphasized
>    \ifconditional\emneeded\relax
>    \else
>      \expandafter\aftergroup
>    \fi
>    \emphasiscorrection}
>
> which provides a hook, as in:
>
>
> \appendtoks
>     \red
> \to \everyemphasized



Be careful: this kills the ability of the emphasized word to be  
hyphenated!

(... at least here with MKII)

Steffen
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : https://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________