printing goocanvasmm

["Klaus Rudolph" <lts-rudolph gmx de>]

I simply want to print a goocanvasmm / Goocanvas::Canvas object.

I found an example how to print in principal, but I can't adapt to the canvas at all.

What I found: 
http://developer.gnome.org/gtkmm-tutorial/3.9/sec-printing-example.html.en

But I have no idea to get the content of the canvas involved.

Any documentation, any hints, maybe a demo program or sources of a program which uses goocanvasmm and do 
printing?

Regards
 Klaus