drawing node edge defined by startpoint and radius

Hello,

I would like to define a curved edge between two nodes (by code) as defined by a point and a radius. The result should be that the edge follows exactly part of a circle with a certain radius.

Has anybody done this or any idea how to achieve this?

Esther

I would like to see a third network node path type for arcs (straight, curved, arc) that would make the solution much easier.