[cairo] Unable to paint on Gtk drawing_area with Cairo

[Stefan Salewski]

On Fri, 2014-08-01 at 14:44 +0530, Gurjot Singh wrote:
> I am trying to paint a point on drawing_area in Gtk with cairo.

Seems that you are using C++, so it may be a good idea to follow this
fine tutorial:

https://developer.gnome.org/gtkmm-tutorial/3.9/chapter-drawingarea.html.en

(I did my drawings in Ruby, but also started following a tutorial...)