Re: Multi-line labels in MetaPost

Re: Multi-line labels in MetaPost

[richard.stephens]

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Re: Multi-line labels in MetaPost

[Aditya Mahajan]

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On Thu, 13 Aug 2009, richard.stephens@converteam.com wrote:

> 
> 
> > > Hello,
> > >
> > > Is it possible to generate multi-line labels in MetaPost?  I have  
> > > naively tried the following hoping to get a line feed between the  
> > > two words, but it doesn't work!
> > >
> > > label.rt( btex One \crlf Two etex, (0,0));
> >
> > \defineframed[mplabel][frame=off,align=right,width=fit]
> >
> > label.rt(textext("\mplabel{One\\Two}"),origin) ;
> >
> > Wolfgang
> 
> Thank-you for a very elegant solution, Wolfgang, unfortunately I get an error:
> 
> ! Argument of \dododefinecolor has an extra }.
> 
> I have fixed this by using:
> 
> label.rt(textext("\framed[frame=off,align=right]{One\\Two}"),origin);
> 
> which works okay. It's not as elegant but as the code is generated
> automatically it does not require any more typing on my part!

Section 4.2 of Mojca's MyWay on sometxt
http://dl.contextgarden.net/myway/sometxt.pdf provides another solution.

Aditya

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Re: Multi-line labels in MetaPost

[Michail Vidiassov]

Dear All,

>> I have fixed this by using:
>> 
>> label.rt(textext("\framed[frame=off,align=right]{One\\Two}"),origin);
>>

And what about proper tables there?
Replacing One\\Two in the above code with
$ \startmathmatrix \NC 1 \NC 1 \NR \NC 1 \NC  1 \NR \stopmathmatrix $
or
\starttable{|cm|cm|} \NC 1 \NC 1 \NC \NR \NC 1 \NC 1 \NC \NR \stoptable
does not work for me.
It complains about "dotripletestemptyx",
but that seems to be some low level utility code and the error messages 
say nothing to me :(

ConTeXt  ver: 2009.08.14 10:48 MKIV

         Sincerely, Michail
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Re: Multi-line labels in MetaPost

[Aditya Mahajan]

On Sat, 22 Aug 2009, Michail Vidiassov wrote:

> Dear All,
>
>>> I have fixed this by using:
>>> 
>>> label.rt(textext("\framed[frame=off,align=right]{One\\Two}"),origin);
>>> 
>
> And what about proper tables there?
> Replacing One\\Two in the above code with
> $ \startmathmatrix \NC 1 \NC 1 \NR \NC 1 \NC  1 \NR \stopmathmatrix $

All metapost environments expand their arguments, so anything looking for 
an optional argument fails. There are workarounds, though

\unexpanded\def\MYMATRIX%
   {$\startmathmatrix \NC 1 \NC 1 \NR \NC 1 \NC  1 \NR \stopmathmatrix$}

\starttext
\startMPcode
   label.rt(\sometxt{\MYMATRIX},   origin) ;
   label.rt(textext ("\MYMATRIX"), (5cm,0)) ;
\stopMPcode
\stoptext

And if you really want it to work, we need to make cetrain things 
unexpandable

\unprotect
\def\dodefinemathmatrix[#1]% [#2]%
   {\unexpanded\setvalue{\e!start#1}{\dodoubleempty\dostartmathmatrix[#1]}%
    \unexpanded\setvalue{\e!stop #1}{\dostopmathmatrix}%
    \setupmathmatrix[#1]}% [#2]

\definemathmatrix[matrix]
\definemathmatrix[\v!mathmatrix]

\unexpanded\def\dodomatrixNC
   {\gdef\domatrixNC{\endmath&}}

% To avoid errors in expansion
\let\NC\relax
\let\NR\relax

\protect

Now this works

\starttext
\startMPcode
   label.rt(\sometxt{$\startmathmatrix \NC 1 \NC 1 \NR \NC 1 \NC  1 \NR 
\stopmathmatrix$},   origin) ;
\stopMPcode

\stoptext


Hans, should we add this to strc-ali?

Aditya
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Re: Multi-line labels in MetaPost

[Hans Hagen]

Aditya Mahajan wrote:

> Hans, should we add this to strc-ali?

sure, i'll also do the same with getbuffer, as often using buffere is 
convenient in such cases:

\unexpanded\def\getbuffer
   {\dodoubleempty\dogetbuffer}

\starttext

\startbuffer[a]
     $\startmathmatrix \NC 1 \NC 1 \NR \NC 1 \NC  1 \NR \stopmathmatrix$
\stopbuffer

\startMPcode
     label.rt("\getbuffer[a]",origin) ;
\stopMPcode

\stoptext



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Re: Multi-line labels in MetaPost

[richard.stephens]

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Re: Multi-line labels in MetaPost

[Thomas A. Schmitz]

On Aug 14, 2009, at 10:54 AM, richard.stephens@converteam.com wrote:

>
> For the record, after reading Mojca's MyWay, and noting that textext  
> is deprecated
> except in certain circumstances,

Well, it's a bit more complicated: in mkii, sometxt was the easiest  
solution because it was flexible and allowed to include all sorts of  
ConTeXt code. In mkiv, textext can do about anything that sometxt can,  
and then some more, so in mkiv, sometxt was deprecated. But I think  
Mojca has nagged Hans into re-implementing sometxt into mkiv as well.  
Complicated, but there you go...

All best

Thomas
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Multi-line labels in MetaPost

[richard.stephens]

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Re: Multi-line labels in MetaPost

[Wolfgang Schuster]

Am 12.08.2009 um 18:09 schrieb richard.stephens@converteam.com:

>
> Hello,
>
> Is it possible to generate multi-line labels in MetaPost?  I have  
> naively tried the following hoping to get a line feed between the  
> two words, but it doesn't work!
>
> label.rt( btex One \crlf Two etex, (0,0));

\defineframed[mplabel][frame=off,align=right,width=fit]

label.rt(textext("\mplabel{One\\Two}"),origin) ;

Wolfgang

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