Re: Colored labels with MetaPost in MkII

["Wolfgang Schuster" <schuster.wolfgang@googlemail.com>]

On Tue, Oct 28, 2008 at 3:47 PM, Aditya Mahajan <adityam@umich.edu> wrote:
> On Mon, 27 Oct 2008, Wolfgang Schuster wrote:
>
>> On Fri, Oct 24, 2008 at 2:15 PM, Aditya Mahajan <adityam@umich.edu> wrote:
>>> On Fri, 24 Oct 2008, Wolfgang Schuster wrote:
>>>
>>>> Hi all,
>>>>
>>>> what is the best method to format MetaPost labels in MkII with \doattributes.
>>>
>>> \startMPenvironment[global]
>>>> \setupcolors[state=start]
>>>>
>>>> \def\labelstyle{bold}
>>>> \def\labelcolor{red}
>>> \stopMPenvironment
>>>
>>> This gives you only bold label.
>>>
>>>> \starttext
>>>> \startMPcode
>>>> label(textext("\doattributes{label}{style}{color}{Label}"),origin) ;
>>>> \stopMPcode
>>>> \stoptext
>>>
>>> Tex colors do not work inside textext. Try
>>>
>>> label(textext("\startcolor[red] red \stopcolor"), origin) ;
>>>
>>> One way to get around this is to use \sometxt.
>>>
>>> label(\sometxt{\doattributes{label}{style}{color}{Label}},(5cm,0)) ;
>>>
>>> But then you have to be careful about the differences between \sometxt in
>>> MKII and MKIV (which I need to  summarize on the wiki).
>>
>> Here is a new example where I can't even use \sometxt.
>
> Sometxt does not work appear to work with \startMPdrawing (there is
> no output at all). I think that the reason is that MPdrawing simply writes
> stuff to the MPfile without doing the extra work needed for sometxt.
>
> I will call this is a bug, but I do not know if Hans wants to work on
> TeX-MP interaction in MKII now.
>
>> \setupcolors[state=start]
>>
>> \def\labelstyle{bold}
>> \def\labelcolor{red}
>>
>> \starttext
>> \resetMPdrawing
>> \startMPdrawing
>> label(textext("\doattributes{label}{style}{color}{Label}"),origin) ;
>> label(\sometxt{\doattributes{label}{style}{color}{Label}},origin) ;
>> \stopMPdrawing
>> \MPdrawingdonetrue
>> \getMPdrawing
>> \stoptext
>
> It may be possible to write your macros without \start-stop-MPdrawing.
> Everything inside \start-stop MP(code|graphic) is first parsed by TeX, so
> you can do things like
>
> \newif\ifcircle \circletrue
>
> \startMPcode
> draw \ifcircle fullcircle \else fullsquare \fi xyscaled (5cm,5cm) ;
> \stopMPcode
>
> So, instead of writing stuff to MP using start-stop MPdrawing, you can
> simply set some flags in conditionals and chardefs, and then write one
> MP(graphic|code) to write one MP file. This strategy will not work for all
> cases, but can be useful for some.

I droped now the MKII part of my module and rewrite parts of the code
with Lua, sometimes and easier and I could use start/stopMPcode with
calls to TeX for a few functions.

Wolfgang
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