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4 重新绘制界面

每次碰撞发生后，程序界面需要重新绘制，代码如下所示。

screen.fill(WHITE)
all_sprites_list.draw(screen)
pygame.display.flip()

其中，screen表示程序的整个界面，将其绘制为白色背景；之后通过all_sprites_list.draw()绘制碰撞后剩下的方块（碰撞的方块已经在group中删除）；最后显示重新绘制的内容。

5 完整代码

以上程序的完整代码如下所示。

import pygame, random
from pygame.locals import *class Block(pygame.sprite.Sprite):def __init__(self, color, width, height):super().__init__()self.image = pygame.Surface((width, height))self.image.fill(color)self.rect = self.image.get_rect()GREEN = (0, 255, 0)
RED = (255, 0, 0)
WHITE = (255, 255, 255)
BLUE = (0, 0, 255)
screen_width = 1000
screen_height = 600
done = False
score = 0
clock = pygame.time.Clock()pygame.init()
screen = pygame.display.set_mode((screen_width, screen_height))
block_list = pygame.sprite.Group()
all_sprites_list = pygame.sprite.Group()
block_bad_list = pygame.sprite.Group()for i in range(50):block = Block(GREEN, 20 ,15)block.rect.x = random.randrange(screen_width)block.rect.y = random.randrange(screen_height)block_list.add(block)all_sprites_list.add(block)for i in range(10):block = Block(RED, 20 ,15)block.rect.x = random.randrange(screen_width)block.rect.y = random.randrange(screen_height)block_bad_list.add(block)all_sprites_list.add(block)player = Block(BLUE, 20, 15)
all_sprites_list.add(player)while not done:for event in pygame.event.get():if event.type == pygame.QUIT:done = Truescreen.fill(WHITE)pos = pygame.mouse.get_pos()player.rect.x = pos[0]player.rect.y = pos[1]blocks_hit_list = \pygame.sprite.spritecollide(player, block_list, True)for block in blocks_hit_list:score += 1print('当前分数为：'+str(score))blocks_hit_list = \pygame.sprite.spritecollide(player, block_bad_list, True)for block in blocks_hit_list:score -= 1print('当前分数为：'+str(score))all_sprites_list.draw(screen)pygame.display.flip()clock.tick(60)pygame.quit()