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?<br>
Thanks<br><br>