Label loops within a XeConTeXt document

Label loops within a XeConTeXt document

[nicola]

Hi,
given the following XeConTeXt document (I use ConTeXt  ver: 2007.01.12):

\definetypeface[MyMainFace][rm][Xserif][Charis SIL][default][encoding=uc]
\definetypeface[MyMainFace][mm][math][euler][euler]
\setupbodyfont[MyMainFace,10pt]

\startuseMPgraphic{foo}
   for i = 0 upto 10:
      % Draw a label at position (i*cm,0)
   endfor;
\stopuseMPgraphic

\starttext
\midaligned{\useMPgraphic{foo}}
\stoptext

is it possible to replace the comment with an instruction (or a macro), 
such that I do not get compilation errors and I get consistent font 
usage?

I have tried the following possibilities:

a) label("test",(i*cm,0)); % Complains about missing metrics for font
b) label(\textext{test},(i*cm,0)); % Ditto
c) label(btex test $x$ etex,(i*cm,0));  % Results in wrong font
d) label(\sometxt{test},(i*cm,0)); % Ok, right font, but loop is ignored

The best option to my knowledge is \sometxt, but I have read that it 
cannot be used in loops. Before I start unrolling all the loops in my 
figures

1) is it possible to specify the fonts in an MPenviroment? If so, how?
2) is there some hack, maybe along the lines of the following (not 
working) example?

vardef prepare(expr n) =
   save s; string s;
   s = "";
   for i = 0 upto n-1:
      s := s & "label(\sometxt{test},(" & decimal(i) & "*cm,0));";
   endfor;
   s
enddef;
scantokens(prepare(10));

Nicola

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Re: Label loops within a XeConTeXt document

[Aditya Mahajan]

On Sat, 23 Jun 2007, nicola wrote:

> Hi,
> given the following XeConTeXt document (I use ConTeXt  ver: 2007.01.12):
>
> \definetypeface[MyMainFace][rm][Xserif][Charis SIL][default][encoding=uc]
> \definetypeface[MyMainFace][mm][math][euler][euler]
> \setupbodyfont[MyMainFace,10pt]
>
> \startuseMPgraphic{foo}
>   for i = 0 upto 10:
>      % Draw a label at position (i*cm,0)
>   endfor;
> \stopuseMPgraphic
>
> \starttext
> \midaligned{\useMPgraphic{foo}}
> \stoptext
>
> is it possible to replace the comment with an instruction (or a macro),
> such that I do not get compilation errors and I get consistent font
> usage?
>
> I have tried the following possibilities:
>
> a) label("test",(i*cm,0)); % Complains about missing metrics for font
> b) label(\textext{test},(i*cm,0)); % Ditto

This is strange. Do you also get this error if you use pdftex instead 
of xetex?

> c) label(btex test $x$ etex,(i*cm,0));  % Results in wrong font
> d) label(\sometxt{test},(i*cm,0)); % Ok, right font, but loop is ignored
>
> The best option to my knowledge is \sometxt, but I have read that it
> cannot be used in loops. Before I start unrolling all the loops in my
> figures
>
> 1) is it possible to specify the fonts in an MPenviroment? If so, how?

Just as you will specify fonts in your regular document. The easiest 
way is as follows:

Place

\startMPinclusions[global]
..
\stopMPinclusions

around the font definitions in your document. That way, the same fonts 
will be used in your document and in metapost. But I have never tested 
this with xetex. In priciple, this should work (as long as texexec 
calls metapost with tex=xetex).

> 2) is there some hack, maybe along the lines of the following (not
> working) example?
>
> vardef prepare(expr n) =
>   save s; string s;
>   s = "";
>   for i = 0 upto n-1:
>      s := s & "label(\sometxt{test},(" & decimal(i) & "*cm,0));";
>   endfor;
>   s
> enddef;
> scantokens(prepare(10));

Have you checked \startTeXtexts ...\stopTeXtexts? See Section 4.4 of 
Mojca's MyWay on \sometxt 
(http://dl.contextgarden.net/myway/sometxt.pdf)

Aditya
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___________________________________________________________________________________

Re: Label loops within a XeConTeXt document

[nicola]

In article <alpine.WNT.0.99.0706231512220.2368@nqvgln>,
 Aditya Mahajan <adityam@umich.edu> wrote:

> On Sat, 23 Jun 2007, nicola wrote:
> 
> > Hi,
> > given the following XeConTeXt document (I use ConTeXt  ver: 2007.01.12):
> >
> > \definetypeface[MyMainFace][rm][Xserif][Charis SIL][default][encoding=uc]
> > \definetypeface[MyMainFace][mm][math][euler][euler]
> > \setupbodyfont[MyMainFace,10pt]
> >
> > \startuseMPgraphic{foo}
> >   for i = 0 upto 10:
> >      % Draw a label at position (i*cm,0)
> >   endfor;
> > \stopuseMPgraphic
> >
> > \starttext
> > \midaligned{\useMPgraphic{foo}}
> > \stoptext
> >
> > is it possible to replace the comment with an instruction (or a macro),
> > such that I do not get compilation errors and I get consistent font
> > usage?
> >
> > I have tried the following possibilities:
> >
> > a) label("test",(i*cm,0)); % Complains about missing metrics for font
> > b) label(\textext{test},(i*cm,0)); % Ditto
> 
> This is strange. Do you also get this error if you use pdftex instead 
> of xetex?
> 
> > c) label(btex test $x$ etex,(i*cm,0));  % Results in wrong font
> > d) label(\sometxt{test},(i*cm,0)); % Ok, right font, but loop is ignored
> >
> > The best option to my knowledge is \sometxt, but I have read that it
> > cannot be used in loops. Before I start unrolling all the loops in my
> > figures
> >
> > 1) is it possible to specify the fonts in an MPenviroment? If so, how?
> 
> Just as you will specify fonts in your regular document. 

Putting the same definitions inside \startMPinclusions... 
\stopMPinclusions does not seem to work with XeTeX.

> Have you checked \startTeXtexts ...\stopTeXtexts? See Section 4.4 of 
> Mojca's MyWay on \sometxt 
> (http://dl.contextgarden.net/myway/sometxt.pdf)

Ah, I did not know about those commands: that works! Just a silly 
question, though: how do I change

\startTeXtexts 
   \dorecurse{10}{\TeXtext{\recurselevel}{$x_{\recurselevel}$}} 
\stopTeXtexts 

so that I can print labels from x_0 up to x_9? Do I need to use 
\defineconversion and \convertnumber?

Nicola

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___________________________________________________________________________________

Re: Label loops within a XeConTeXt document

[Aditya Mahajan]

On Sat, 23 Jun 2007, nicola wrote:

> In article <alpine.WNT.0.99.0706231512220.2368@nqvgln>,
> Aditya Mahajan <adityam@umich.edu> wrote:
>
>> On Sat, 23 Jun 2007, nicola wrote:
>>
>>> Hi,
>>> given the following XeConTeXt document (I use ConTeXt  ver: 2007.01.12):
>>>
>>> \definetypeface[MyMainFace][rm][Xserif][Charis SIL][default][encoding=uc]
>>> \definetypeface[MyMainFace][mm][math][euler][euler]
>>> \setupbodyfont[MyMainFace,10pt]
>>>
>>> \startuseMPgraphic{foo}
>>>   for i = 0 upto 10:
>>>      % Draw a label at position (i*cm,0)
>>>   endfor;
>>> \stopuseMPgraphic
>>>
>>> \starttext
>>> \midaligned{\useMPgraphic{foo}}
>>> \stoptext
>>>
>>> is it possible to replace the comment with an instruction (or a macro),
>>> such that I do not get compilation errors and I get consistent font
>>> usage?
>>>
>>> I have tried the following possibilities:
>>>
>>> a) label("test",(i*cm,0)); % Complains about missing metrics for font
>>> b) label(\textext{test},(i*cm,0)); % Ditto
>>
>> This is strange. Do you also get this error if you use pdftex instead
>> of xetex?
>>
>>> c) label(btex test $x$ etex,(i*cm,0));  % Results in wrong font
>>> d) label(\sometxt{test},(i*cm,0)); % Ok, right font, but loop is ignored
>>>
>>> The best option to my knowledge is \sometxt, but I have read that it
>>> cannot be used in loops. Before I start unrolling all the loops in my
>>> figures
>>>
>>> 1) is it possible to specify the fonts in an MPenviroment? If so, how?
>>
>> Just as you will specify fonts in your regular document.
>
> Putting the same definitions inside \startMPinclusions...
> \stopMPinclusions does not seem to work with XeTeX.

It is MPenvironent and not MPinclusions. I do not have xetex, so I 
can not test this.

>> Have you checked \startTeXtexts ...\stopTeXtexts? See Section 4.4 of
>> Mojca's MyWay on \sometxt
>> (http://dl.contextgarden.net/myway/sometxt.pdf)
>
> Ah, I did not know about those commands: that works! Just a silly
> question, though: how do I change
>
> \startTeXtexts
>   \dorecurse{10}{\TeXtext{\recurselevel}{$x_{\recurselevel}$}}
> \stopTeXtexts
>
> so that I can print labels from x_0 up to x_9? Do I need to use
> \defineconversion and \convertnumber?

No, use \dostepwiserecuse. The general syntax is

\dostepwiserecurse {from} {to} {step} {action}

so

\dostepwiserecurse {0} {9} {1} 
{\TeXtext{\recurselevel}{$x_{\recurselevel}$} should work.

Aditya



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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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___________________________________________________________________________________

Re: Label loops within a XeConTeXt document

[nicola]

> >>> 1) is it possible to specify the fonts in an MPenviroment? If so, how?
> >>
> >> Just as you will specify fonts in your regular document.
> >
> > Putting the same definitions inside \startMPinclusions...
> > \stopMPinclusions does not seem to work with XeTeX.
> 
> It is MPenvironent and not MPinclusions. I do not have xetex, so I 
> can not test this.

Ok, even if I put those definitions in an MPenvironment the text fonts 
do not change (I guess the mechanism for font selection is slightly 
different in XeTeX).

> > how do I change
> >
> > \startTeXtexts
> >   \dorecurse{10}{\TeXtext{\recurselevel}{$x_{\recurselevel}$}}
> > \stopTeXtexts
> >
> > so that I can print labels from x_0 up to x_9? Do I need to use
> > \defineconversion and \convertnumber?
> 
> No, use \dostepwiserecuse. The general syntax is
> 
> \dostepwiserecurse {from} {to} {step} {action}
> 
> so
> 
> \dostepwiserecurse {0} {9} {1} 
> {\TeXtext{\recurselevel}{$x_{\recurselevel}$} should work.

Thank you very much!

Nicola

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___________________________________________________________________________________

Re: Label loops within a XeConTeXt document

[nicola]

> >  how do I change
> >
> > \startTeXtexts
> >   \dorecurse{10}{\TeXtext{\recurselevel}{$x_{\recurselevel}$}}
> > \stopTeXtexts
> >
> > so that I can print labels from x_0 up to x_9? Do I need to use
> > \defineconversion and \convertnumber?
> 
> No, use \dostepwiserecuse. The general syntax is
> 
> \dostepwiserecurse {from} {to} {step} {action}
> 
> so
> 
> \dostepwiserecurse {0} {9} {1}

I guess it must be \dostepwiserecurse {0} {9} {1} {}

> {\TeXtext{\recurselevel}{$x_{\recurselevel}$} should work.

I have tried that, but sometxt(0) prints nothing. Anyway, I have solved 
it like this:

\startTeXtexts
   \TeXtext{0}{$x_0$}
   \dorecurse{30}{\TeXtext{\recurselevel}{$x_{\recurselevel}$}}
\stopTeXtexts

Thanks again!
Nicola

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