Cairo is a software library used to provide a vector graphics-based, device-independent API for software developers.
GTK+ is a toolkit for creating graphical user interfaces (GUIs) with cross platform compatibility and an easy to use API.
"The problem is that the canvas drawn by cairo is larger than the area of gtk s scrolled_window"
from question "GtkDrawingArea with Cairo - how to make it scrollable"
"With gtk it s more common to use cairo already mentioned by jeff foster"
from question "Looking for a Java Graphics alternative"