2. Pygame Animación

import pygame, sys , time
from pygame.locals import *

# set up pygame
pygame.init()

# set up the window
WINDOWWIDTH = 400
WINDOWHEIGHT = 400
windowSurface = pygame.display.set_mode((WINDOWWIDNTH,WINDOWHEIGHT),0,32)
pygame.display.set_caption('Animation')

# set up the direction variables
DOWNLEFT = 1
DOWNRIGHT = 3
UPLEFT = 7
UPRIGHT = 9

MOVESPEED = 4
# set up the block data structure
b1 = {'rect':pygame.Rect(300,80,50,100),'color':RED,'dir':UPRIGHT}
b2 = {'rect':pygame.Rect(200,200,20,20),'color':BLUE,'dir':UPLEFT}
b3 = {'rect':pygame.Rect(100,150,60,60),'color':GREEN,'dir':DOWNLEFT}
blocks = [b1,b2,b3]
while True:
   # check for the QUIT event
   for event in pygame.event.get():
      if event.type == QUIT:
         pygame.quit()
         sys.exit()

   # draw the black background onto the surface
   windowSurface.fill(BLACK)

   for b in blocks:
      # move the block data structure
      if b['dir'] == DOWNLEFT:
         b['rect'].left -= MOVESPEED
         b['rect'].top += MOVESPEED

      if b['dir'] == DOWNRIGHT:
         b['rect'].left += MOVESPEED
         b['rect'].top += MOVESPEED

      # check if the block has moved out of the window
      if b['rect'].top < 0:
         # block has moved past the top
         if b['dir'] == UPLEFT:
            b['dir'] = DOWNLEFT
         if b['dir'] == UPRIGHT:
            b['dir'] = DOWNRIGHT

      if b['rect'].bottom > WINDOWHEIGHT:
         # block has moved past the bottom
         if b['dir'] == DOWNLEFT:
            b['dir'] = UPLEFT
         if b['dir'] == DOWNRIGHT:
            b['dir'] = UPRIGHT

      if b['rect'].left < 0:
         # block has moved past the left side
         if b['dir'] == DOWNLEFT:
            b['dir'] = DOWNRIGHT
         if b['dir'] == UPLEFT:
            b['dir'] = UPRIGHT

      if b['rect'].right > WINDOWWIDTH:
         # block has moved past the right side
         if b['dir'] == DOWNRIGHT:
            b['dir'] = DOWNLEFT
         if b['dir'] == UPRIGHT:
            b['dir'] = UPLEFT

      # draw the block onto the surface
      pygame.draw.rect(windowSurface, b['color'],b['rect'])

   # draw the window onto the screen
   pygame.display.update()
   time.sleep(0.02)
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