title: Character only maintains movement while mouse is moving on screen?
body: <p>My while loops only maintains the movement for the sprite while the cursor is moving inside of the screen. I've tried reorganizing some of the screen.blits and display.update() and display.flip(). I can't seem to figure out why the character stops after a change in one pixel instead of continuing like it I intended. </p>
  
  <pre><code>    background_image = 'Terrain_Grass_First.png'
      import pygame, sys
      from pygame.locals import *
      pygame.init()
      pygame.display.set_caption('Hans')
      screen_width = 600
      screen_height = 400
      screen = pygame.display.set_mode((screen_width, screen_height),0,32)
      pygame.mouse.set_visible(False)
      sprite = pygame.image.load('Hans_front_still.png').convert_alpha()
      x,y = (0,0)
      movex, movey = (0,0)
      while True:
          for event in pygame.event.get():
                  if event.type == QUIT:
                          pygame.quit()
                          sys.exit()
  
                  if event.type == KEYDOWN:
                          if event.key == K_ESCAPE:
                                  pygame.quit()
                                  sys.exit()
                          if event.key == K_w:
                                  y = -1
  
                          elif event.key == K_a:
                                  x = -1
  
                          elif event.key == K_s:
                                  y = +1
  
                          elif event.key == K_d:
                                  x = +1
  
                  elif event.type == KEYUP:
                          if event.key == K_w:
                                  y = 0
  
                          elif event.key == K_a:
                                  x = 0
  
                          elif event.key == K_s:
                                  y = 0
  
                          elif event.key == K_d:
                                  x = 0
                  movex += x
                  movey += y
  
  
          screen.fill((0,0,0))
          screen.blit(sprite,(movex,movey))
          pygame.display.flip()
  </code></pre>