OOP in Metafun.

[Andre Caldas <andre.em.caldas@gmail.com>]

Hello, list!

I am writing down a macro package for commutative diagrams using metafun.
This is my first try:
https://bitbucket.org/andrecaldas/math-video-classes/src/9a050eab20348c9a9c9e50740618173648979f45/src/environments/diagrams.tex?at=default

Used here:
https://bitbucket.org/andrecaldas/math-video-classes/src/9a050eab2034/src/products/assorted/open_mapping_theorem/notes/introduction.tex?at=default#cl-106

But I would like to use some "object oriented" like approach. That is,
I'd like the diagram data structure to be set up like this:

d = CD.new;
d.vertex("$X$"); d.arrow("$f$"); d.vertex("$Y$");
d.newline;
d.arrow("$\pi$"); d.arrow("$\pi$");
d.vertex("$A$"); d.arrow("$g$"); d.vertex("$B$");

or even in some "thelabel" similar fashion,

d = CD.new;
CD.vertex(d, "$X$"); CD.arrow(d, "$f$"); CD.vertex(d, "$Y$");
CD.newline(d);
CD.arrow(d, "$\pi$"); CD.arrow(d, "$\pi$");
CD.vertex(d, "$A$"); CD.arrow(d, "$g$"); CD.vertex(d, "$B$");


How do I do that in METAFUN/METAPOST?


Cheers,
André Caldas.
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