Could someone please show me a minimal working example of using C language for Cairo with Gtk3 to draw a single line in a GtkDrawingArea. I've tried to modify testcairo.c in the Gtk3 tests folder but I can't get it to work. Please don't suggest the tutorials at the Cairo site; Zetcode.com or gnome.org which are either not for use with Gtk3 or not minimal working examples.
I got it. The key difference is that for gtk+3 you must draw from within a "draw" signal handler. With gtk+2 it's from within the "expose-event" signal handler. Here's a minimal working example.