"I'm developing a program which has so set up a fullscreen window, draw some polygons and use threads. Does anybody know somewhere with info about how to do this? Thanks."
I recommend that you use Gtk+ or Qt. These packages will do what you want, except perhaps the polygons depending on how elaborate the polygons are. There are books and online tutorials available for both Gtk+ and Qt. My personal preference is Gtk+.
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Steve Stites