You could take a look at my graph editor GED. I don't use GD for printing, but the other points are covered, I think. You can find it here:

http://www.duehl.de/christian/perl/ged.html#download

It's a german side, but you will find the download link easily. The program has german comments too, but it's planed to be translated.

You can't steal this code, because it already belongs to you (to all) =)