[pygame] Fastest way to plot a map.

[Scott Russell <scott@activestudios.com>]

Hi, all.  

I've got some code that currently keeps a map as an array of integers:

map = [[0] * map_max_y for i in range(map_max_x)]

The map is larger than the viewport.

The current screen is constructed with something like this pseudocode

Assume the viewport is guaranteed to be safely within the boundaries - 
it's checked elsewhere.

for x in range(viewport.x, viewport.x + viewport.width):
  for y in range(viewport.y, viewport.y + viewport.height):
    cell = map[x][y]
    if cell != 0:
      if cell == 10:
        viewport.display.set_at((x,y),(255,255,255))
      elif cell ==20:
        viewport.display.set_at((x,y),(0,255,255))
      else:
        viewport.display.set_at((x,y),(128,128,128))

blit_and_flip(Screen)

Of course this is slow.  Screen redraws are on the order of a half a 
second.  Is there something
I can do with pynumeric to make this fast enough for realtime (atleast 
10 fps)?  
Can I speed up an order of magnitude using map somethow?  Do I need to 
drop to C?

Any ideas would be appreciated.

  - Scott


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