[NTG-context] MPinstance

Alan BRASLAU alan.braslau at cea.fr
Thu Apr 7 16:35:34 CEST 2016


On Thu, 7 Apr 2016 12:14:39 +0200
Hans Hagen <pragma at wxs.nl> wrote:

> On 4/7/2016 11:20 AM, dr. Hans van der Meer wrote:
> > I do not understand the info in the ConTeXt wiki on setupMPinstance.
> >
> > The syntax is specified as \setupMPinstance[...][...,...=...,...0
> > [...] name
> > format metafun mpost
> > etc.
> >
> > I read this as:
> > in the first argument one can specify a name presumably a name
> > specified on \defineMPinstance. in the second argument
> > [format=metafun] specifies the format. But then the example under
> > Usage gives: \setupMPinstance[metafun][...]
> > Why metafun in the first instead of the second argument as implied
> > in the syntax description? I get confused here.
> >
> > Also in the description \startMPextensions and
> > \startMPinitializations are mentioned, but their descriptions are
> > missing from the list given in the page MetaPost in ConTeXt. How
> > are these described and what is the specific purpose of
> > \startMPextensions compared to \startMPinitializations? What is the
> > recommended use for them?
> 
> you can look in m-graph.mkiv for an example of using instances

For example, I work with a "3D" instance of MP:

\defineMPinstance
  [three]
  [format=metafun,
   extensions=yes,
   initializations=yes,
   method=double]

\startMPdefinitions{three}
  input three ;
\stopMPdefinitions

Where three.mp contains my 3D projection macros.

Use is then

\startMPcode{three}
...
\stopMPcode


Alan


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