Re: [Pysdl-devel] sprites, mouse cursor

[David C. <D. C. <si...@te...>]

Mark Baker writes:
 > On Fri, 02 Jun 2000, Pete Shinners wrote:
 > > right now in pysdl, there's no way to go mess with
 > > pixels aside from the get_at and put_at. needless
 > > to say this is extremely slow. even a 200x150 window
 > > of the fire takes a couple seconds each frame.
 > 
 > This is inaccurate. You can manipulate surfaces using the slice operator.
 > surface[y] returns a list of pixels.
 > c_x = surface[y]
 > x = 0
 > while x < len(c_x):
 > 	c_x[x] = some_color
 > 	some_color = some_other_color()
 > 	x = x + 1
 >  
 > Whether or not this ends up being faster, is a different story all together.

My understanding is that the following minimal test program should
work. Unfortunately, it doesn't.

#! /usr/bin/env python

import sdl
sdl.init(sdl.INIT_VIDEO)
video = sdl.video_set_mode(200,200,16,sdl.SWSURFACE)
video[100][100] = video.map_rgb((255,255,255))
video.update_rect((0,0,0,0))
while 1:
    pass

This should plot a white pixel at the center of the surface, but no
white pixel appears. This is strange; I remember testing this back
when it was introduced in 0.0.3, and it worked fine then. Am I doing
something wrong?

-- 
David Clark
si...@te...
Preliminary pySDL Documentation:
http://www3.telus.net/futility/futility/docs/pysdl/index.html