R help - Sep 2005 - After resizing a tkwidget, how do I get the size of the widget??

Dear all,
I am trying make a small tcltk thing for drawing graphs with vertices, edges
etc. I can draw the graph in a window.

- I would like it so that if I resize the window, the graph will also be
resized. To do this, I guess I need the size of the window, so that I can
calculate the new coordinates.
- I would also like to be able to save the graph as e.g. a jpg/ps file.
Can anyone help on this?

I find the documentation of the tcltk package difficult to comprehend so I have
used the examples on http://bioinf.wehi.edu.au/~wettenhall/RTclTkExamples/. Can
anyone point me to other sources of examples/doc of the tcltk package?
Thanks in advance
S??ren