# sampleevent.py
#
# A simple program from the pygame tutorial to bounce a
# ball around a window

import sys
import pygame
from pygame.locals import *

def main():
   pygame.init()
   width, height = 320, 240
   size = (width, height)
   speed = [2, 2]
   black = (0, 0, 0)
   screen = pygame.display.set_mode(size)

   ball = pygame.image.load("ball.gif")
   ballrect = ball.get_rect()

   while True:
      for event in pygame.event.get():
         if event.type == QUIT:
            pygame.quit()
            sys.exit()
         elif event.type == KEYDOWN:
            if event.key == K_q:
               pygame.quit()
               sys.exit()
            elif event.key == K_LEFT:
               speed[0] -= 1

      ballrect = ballrect.move(speed)
      if ballrect.left < 0 or ballrect.right > width:
         speed[0] = -speed[0]
      if ballrect.top < 0 or ballrect.bottom > height:
         speed[1] = -speed[1]

      screen.fill(black)
      screen.blit(ball, ballrect)
      pygame.display.flip()

if __name__ == '__main__':
   main()