Visio like library for Python?

[Padraig at Linux.ie]

Johannes Eble wrote:
> Hello community,
> 
> is there a library available for Python that behaves similar to MS
> Visio? For example, I would like to create vector graphic objects and
> connect the with a line. If I move, flip or rotate a connected object,
> the line should follow the connection.
> 
> I would like to draw UML diagrams.

The method used by http://gaphor.sourceforge.net/

Padraig.