Rendering Standalone MetaPost Graphics with ConTeXt

Rendering Standalone MetaPost Graphics with ConTeXt

[Vincent Hennebert via ntg-context]

I’d like to use MetaPost to generate all sorts of standalone graphics
(ultimately converted to SVG). For various reasons (among others,
MetaFun and advanced text processing) I want to use MetaPost as
embedded in ConTeXt rather than a standalone installation.

---- metapost.mp ----
fill fullcircle scaled 10cm;
----

Whether I run
  context metapost.mp
or
  mtxrun --script metapost metapost.mp
I get a PDF document that contains no page.

The mtxrun version generates the following temp file:
---- mptopdf-temp.tex ----
\starttext
\startMPinclusions
fill fullcircle scaled 10cm;
\stopMPinclusions
\stoptext
----

Looking at the wiki, it seems that \startMPinclusions is not meant to
actually render any content, just to include MetaPost code like
function definitions. I guess I would have expected \startMPpage
instead.

Am I doing something wrong, or is that an error in ConTeXt?

Thanks,
Vincent
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Rendering Standalone MetaPost Graphics with ConTeXt

[śrīrāma via ntg-context]

On 5/19/22 1:53 PM Vincent Hennebert via ntg-context wrote:
> Looking at the wiki, it seems that \startMPinclusions is not meant to
> actually render any content, just to include MetaPost code like
> function definitions. I guess I would have expected \startMPpage
> instead.
> 
> Am I doing something wrong, or is that an error in ConTeXt?

The MP statements should be inside a beginfig() .. endfig.
With metapost.mp containing – 

  beginfig();
  draw fullcircle scaled 10cm;
  endfig;

the temporary file from mptopdf will have (\start...\stop)MPpage as required.

  Sreeram


___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Rendering Standalone MetaPost Graphics with ConTeXt

[Vincent Hennebert via ntg-context]

On Thu, 2022-05-19 at 14:23 +0530, śrīrāma wrote:
> On 5/19/22 1:53 PM Vincent Hennebert via ntg-context wrote:
> > Looking at the wiki, it seems that \startMPinclusions is not meant
> > to
> > actually render any content, just to include MetaPost code like
> > function definitions. I guess I would have expected \startMPpage
> > instead.
> > 
> > Am I doing something wrong, or is that an error in ConTeXt?
> 
> The MP statements should be inside a beginfig() .. endfig.

Oh, I see. Not super fan of enclosing each and every of my graphics in
a beginfig...endfig statement, but it does the job indeed.

Although in my case I must give a number parameter to beginfig,
otherwise I get an error.

Thanks Sreeram!
Vincent
___________________________________________________________________________________
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://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________