[Matplotlib-users] Arrows with circular curvature

[Mark B. <mar...@gm...>]

I am trying to draw plasmid maps in matplotlib. This requires drawing
arrows with a circular curvature (see here for example
http://www.encyclon.net/docs/plasmidmap/images/ex6.gif). However, when I
try to curve the arrows, for instance using this example (
http://matplotlib.org/api/artist_api.html#matplotlib.patches.ArrowStyle), I
can only get parabolic type curves, not circular curves. Can someone who
understands this a little better help me out with a simple example?
Thanks,
Mark