Touchscreen GUI

#!/usr/bin/python

import pygame
import serial
from pygame.locals import *
from time import sleep
from random import randint
import sys
points = []
size = 32

if(len(sys.argv) != 3):
  print "Usage: %s serial_port baud_rate\n" % sys.argv[0];
  exit(1)


serialPort = sys.argv[1]
baudRate = int(sys.argv[2])

for i in range(0, size):
  points.append((0, 0))

s = serial.Serial(serialPort, baudRate);
s.flushInput()
s.flush()

def main():
  pygame.init()
  screen = pygame.display.set_mode((256, 256))
  background = pygame.Surface(screen.get_size())
  background = background.convert()
  background.fill((255, 255, 255))

  # Blit everything to the screen
  screen.blit(background, (0, 0))
  pygame.display.flip()



  # Event loop
  while 1:
    for event in pygame.event.get():
      if event.type == QUIT:
        return

    l = points.pop(0)
    n = (ord(s.read()) + 1, ord(s.read()) + 1)
    print "%d %d\n" % (n[0], n[1])
    points.append(n)

    screen.set_at((l[0], l[1]), (255, 255, 255))

    for i in points:
      screen.set_at((i[0], i[1]), (0,0,0))

    #screen.blit(background, (0, 0))
    pygame.display.flip()


if __name__ == '__main__' : main()