TikZ allows regular polygons with specified number of sides for nodes. I'm using PGF though and want similar features and to be able to create my own custom shapes.
See percusse's answer for example code:
and
http://www.texample.net/tikz/examples/node-shapes/
for the polygons.
What I would like is to be able to create a reference shape like rpoly7
that is simply a regular polygon with 7 sides that uses the TikZ shapes but can be passed to PGF like I do with the other shapes.