存活一定时间的方块角色

"""
   存活一定时间的方块角色
"""
import pygame
import random

class Square(pygame.sprite.Sprite):
    """继承自pygame.sprite.Sprite的Square类"""
    
    def __init__(self, pos, *groups):
        super().__init__(*groups)
        self.image = pygame.Surface((50, 30))
        self.image.fill(pygame.Color('cyan'))
        self.rect = self.image.get_rect(center=pos)
        self.timer = None
        self.dx = random.randint(-5,5)
        self.dy = random.randint(-5,5)
        
    def move(self):
        """移动矩形"""
        self.rect.move_ip(self.dx/10,self.dy/10)
        
    def update(self):
        """更新自己"""
        self.move()
        if self.timer is not None:    # 计时器启动了,那么开始计时,超过1500毫秒就自杀
            if pygame.time.get_ticks() - self.timer >= 1500:
                self.kill()
                
screen = pygame.display.set_mode((640, 480))
pygame.display.set_caption("存活一定时间的方块角色")

squares = pygame.sprite.Group()      # 所有的方块组
方块 = Square((320, 240), squares)   # 新建一个方块

running = True
clock = pygame.time.Clock()          # 新建时钟对象
while  running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            running = False
        elif event.type == pygame.KEYDOWN:
            # 按任意键开始计时
            方块.timer = pygame.time.get_ticks()

    squares.update()
    screen.fill((30, 30, 30))
    squares.draw(screen)

    pygame.display.flip()
    clock.tick(30)

pygame.quit()