Re: [pygame] Fastest way to plot a map.

[Scott Russell <scott@activestudios.com>]

Angus Young wrote:

>--- Scott Russell <scott@activestudios.com> wrote:
>
>>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
>>
>
>Very first thing you can try is only doing that
>set_at/get_at routine when you need it.  Blit to an
>extra surface (call it 'map'?) and then just blit that
>surface to the screen every cycle.  When the viewport
>scrolls enough (x amount of pixels) use that routine
>(or an optimized one) to redraw the map.
>
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Unfortunatley, this map changes every frame.  I could track which 
individual elements change...

I think the answer is what Pete was hinting at at the beginning of his 
response - go tile based, and dramatically decrease the size of the 
viewport.

  - Scott


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