[cairo] drag objects (polygon) to desired position

[David Boon]

Hello,
I am trying to update a simulator which uses pycairo-pygtk. I needed
to draw polygons on definite points (the user selects using mouse
pointer) on runtime. Though I am able to draw polygons I am not able
to really draw it in the desired position selected by the user.

Is there a way to draw on specific points on screen as selected by the
user or is it possible to drag the polygon to the desired position?