[Glade-users] Drawing on a background image

[chr meyer nerim net (christophe Meyer)]

Hello,
In order to write weather satellite tracking software i have to draw
satellites footprints on a background earh image such in this example:
http://www.david-taylor.pwp.blueyonder.co.uk/software/wxtrack_at_work.htm
It's the first time i use glade and gtk and i don't know how to do this :(
Does anyone know how to do this ? has anyone already done something like 
that ?
Thanks for your help
Chris