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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((WINDOWWIDTH, WINDOWHEIGHT), 0, 32)

pygame.display.set_caption('Animation')

# Set up direction variable

DOWNLEFT = 'downleft'

DOWNRIGHT = 'downright'

UPLEFT = 'upleft'

UPRIGHT = 'upright'

MOVESPEED = 4

# Set up the colors.

WHITE = (255, 255, 255)

RED = (255, 0, 0)

GREEN = (0, 255, 0)

BLUE = (0, 0, 255)

# Set up box data struture.

b1 = {'rect':pygame.Rect(300, 80, 50, 100), 'color':RED, 'dir':UPRIGHT}

b2 = {'rect':pygame.Rect(200, 200, 90, 60), 'color':GREEN, 'dir':UPLEFT}

b3 = {'rect':pygame.Rect(100, 150, 60, 60), 'color':BLUE, 'dir':DOWNLEFT}

boxes = [b1, b2, b3]

# Run the game loop.

while True:

# Check for Quit event

for event in pygame.event.get():

if event.type == QUIT:

pygame.quit()

sys.exit()

# Draw the white background on the surface.

windowSurface.fill(WHITE)

for b in boxes:

# Move the box 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

if b['dir'] == UPLEFT:

b['rect'].left -= MOVESPEED

b['rect'].top -= MOVESPEED

if b['dir'] == UPRIGHT:

b['rect'].left += MOVESPEED

b['rect'].top -= MOVESPEED

# Check whether the box has moved out of the window.

if b['rect'].top < 0:

# The box has moved past the top

if b['dir'] == UPLEFT:

b['dir'] = DOWNLEFT

if b['dir'] == UPRIGHT:

b['dir'] = DOWNRIGHT

if b['rect'].bottom > WINDOWHEIGHT:

# The box has moved past the bottom

if b['dir'] == DOWNLEFT:

b['dir'] = UPLEFT

if b['dir'] == DOWNRIGHT:

b['dir'] = UPRIGHT

if b['rect'].left < 0:

# The box 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:

# The box has moved past the right side

if b['dir'] == DOWNRIGHT:

b['dir'] = DOWNLEFT

if b['dir'] == UPRIGHT:

b['dir'] = UPLEFT

# Draw the box onto the surface.

pygame.draw.rect(windowSurface, b['color'], b['rect'])

# Draw the winow onto the screen.

pygame.display.update()

time.sleep(0.02)