David Culp
David Culp New Member Posts: 12
I got my Up Board up and running with no problems - wow, this thing is FAST. I own a very large number of other Linux based SBC's and this one is amazing so far.

I installed the latest ubilinux image and I am having some problems with Pygame. I have run apt-get update and apt-get dist-upgrade. I installed pygame with "sudo apt-get install python-pygame". However, when running a simple script that plots Sierpinski's triangle the screen simply goes blank. I know this script works as I have run it on a lot of different computers. In fact, it is one of the scripts I use to get my students interested in Python programming.

The script appears below. Any help would be appreciated.
#Simple Python 2 script by David Culp ([email protected]) that uses a chaos algorithm to plot Sierpinski's triangle

import pygame, random, sys

#change these to suit your screen

num_iterations = int(raw_input("How many iterations do you want? "))

screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
screen.fill( (0,0,0) )

ax = 0
cy = 0

px = ax
py = ay

print "Calculating, please wait......\n\n"
for n in range(1, num_iterations+1):

    vx = random.randrange(0,3)
    if vx == 0:
        px = (px + ax) / 2
        py = (py + ay) / 2
        red = 255
        green = 0
        blue = 0
    elif vx == 1:
        px = (px + bx) / 2
        py = (py + by) / 2
        red = 0
        green = 0
        blue = 255
        px = (px + cx) / 2
        py = (py + cy) / 2
        red = 0
        green = 255
        blue = 0

    screen.set_at( (px, py), (red,green,blue) )
    if n%10000 == 0: sys.stdout.write('.')
    if n%100000 == 0: print '|'+str(n)+'\n'

print "\nDone!"

while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:


  • DCleri
    DCleri Administrator, AAEON Posts: 1,213 admin
    Hi daveculp,

    Thanks for you feedback about your experience with the UP Board.

    About the pygame, could you try to change the resolution to 1920x1080 on the following section?

    #change these to suit your screen
    SCREEN_WIDTH = 800
  • David Culp
    David Culp New Member Posts: 12
    It doesn't work, the screen still blanks. The actual problem is in the call to pygame.init() which doesn't set a screen resolution, it only initializes pygame.

    I will see if I can compile pygame from source this weekend instead of installing it from the repo and see if that fixes it.
  • David Culp
    David Culp New Member Posts: 12
    I compiled Pygame from source and installed and I get the same thing - a black screen.

    Anyone willing to give pygame a try? Install pygame with:
    sudo apt-get install python-pygame

    Then fire up python and try the following at the python prompt:
    >>>import pygame

    See if the screen blanks.
  • Thomas Grzesitza
    Thomas Grzesitza New Member Posts: 4
    i get this.
    :~$ python
    Python 2.7.9 (default, Mar  1 2015, 12:57:24) 
    [GCC 4.9.2] on linux2
    Type "help", "copyright", "credits" or "license" for more information.
    >>> import pygame
    >>> pygame.init()
    (6, 0)

    hope it helps
  • David Culp
    David Culp New Member Posts: 12
    Thanks. So no screen blanking then?

    I actually get the same output except my screen goes blank and the monitor loses signal. I can then press ESC and blindly type "quit()" into the python command prompt. I get my monitor signal back and the exact same output you have. The return of "(6, 0)" indicates that pygame was able to init 6 subsystems and failed on 0. Although now that I think about it, I wonder if my output was (0,6).

    My next steps to figure this out are:

    1. Swap in a different monitor. I didn't think pygame.init() actually did anything at all with switching resolution and I know pygame works with some other Linux systems I have with this monitor but you never know.
    2. Reinstall Ubilinux.
    3. Try Ubuntu
  • Thomas Grzesitza
    Thomas Grzesitza New Member Posts: 4
    Without Blanking.
  • David Culp
    David Culp New Member Posts: 12

    It was the monitor. I swapped out with a newer model and it works great.