Most of the time here in the begining of the gpredict for Gtk+ 2 development process will go with writing all sorts of small utility widgets, which can be re-used several places in the program.
gtk+
Gtk+ 2 Port of Gpredict
It is now time to get started on the Gtk+ 2 port of gpredict. Boy, it will be a lot of work because I will have to rewrite most of the program. Even the non-gui parts will be heavily modified. For example the tracking engine will be rewritten to use the more accurate SGP4 and SDP4 algorithms.