[Tutor] Mapping of co-ordinates... pygame

[Muhammad Ali]

Hi,

I have some x and y co-ordinates ranging from (-100, 100) for each x and y.
Something like this:

                   100
                     |
                     |
                     |
                     |
-100------------------------------100
                     |
                     |
                     |
                     |
                  -100

 I would like to plot them on a pygame surface.
I have found that pygame surface is (0, 0) at top right to (width, height)
at the bottom right corner, like this:

(0,0)                      (width, 0)
------------------------------------
|                                   |
|                                   |
|                                   |
|                                   |
|                                   |
|                                   |
|                                   |
------------------------------------
(0,height)                (width, height)


I need a way to map any value from my range to this surface so I could do
stuff like this:
pygame.draw.circle(screen, color, (x, y), size

Also my range could vary from -5, 5 or -500 to 500 so I need something
generic...

It looks like a simple problem but I can't seem to be able to figure it out.

Thanks,

Ali
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