title: Python, pygame, how to draw an arc
body: <p>I'm trying to draw an arc in pygame, the actual size and position of the arc aren't important, at the moment all I get is an elipse.</p>
  
  <p>My code:</p>
  
  <pre><code>import pygame
  import sys
  
  pygame.init()
  size = width, height = 400, 600
  screen = pygame.display.set_mode(size)
  
  while 1:
      for event in pygame.event.get():
          if event.type == pygame.QUIT:
              sys.exit()
  
  
      screen.fill((0,0,0))
  
      pygame.draw.arc(screen, (255, 255, 255), (50, 50, 50, 50), 10, 20, 1)
  
      pygame.display.flip()
  </code></pre>
  
  <p>Why does this draw a full circle instead of an arc?</p>