[cairo] Translate and scale question

[Xenofon Papadopoulos]

Hello, I'm a Cairo newbie. I'm using Cairo in python to draw on a
DrawingArea with 400x300 device size, but my user coordinations system
ranges from x_min to x_max on the x-axis and from y_min to y_max on the
y-axis (for example from -10 to 10 on the x-axis, and from -20 to 20 on the
y-axis). What are the transformations I have to do to use user coordinates
in draw operations?
Thanks
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