代码如下：
Unit aaa: Pygame Hello Wall Ball Game version 1
import pygame, sys
pygame.init()
size = width, height = 600, 400
speed = [1, 1]
BLACK = 0, 0, 0
screen = pygame.display.set_mode(size)
pygame.display.set_caption("Pygame壁球")
ball = pygame.image.load("PYG02-ball.gif")
ballrect = ball.get_rect()
fps = 300
fclock = pygame.time.Clock()
while True:
for event in pygame.event.get():
if event.type == pygame.QUIT:
sys.exit()
elif event.type ==pygame.KEYDOWN:
if event.key==pygame.K_LEFT:
speed[0]=speed[0] if speed[0]==0 else (abs(speed[0] - 1))* int(speed[0]/abs(speed[0]))
if event.key == pygame.K_RIGHT:
speed[0] = speed[0]+1 if speed[0]>0 else speed[0]-1
elif event.key == pygame.K_UP:
speed[1] = speed[1] + 1 if speed[1] > 0 else speed[1]-1
elif event.key == pygame.K_DOWN:
speed[1] = speed[1] + 1 if speed[1] > 0 else (abs(speed[1]) - 1)* int(speed[1]/abs(speed[1]))
ballrect = ballrect.move(speed[0], speed[1])
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.update()
fclock.tick(fps)
