asteroid invasion.py 文件源码

def update(self):
        if self.hidden and pygame.time.get_ticks() - self.hide_timer > 1000:
                self.hidden = False
                self.rect.centerx = WIDTH / 2
                self.rect.bottom = HEIGHT - 10
        self.speedx = 0
        #speed=8
        keystate = pygame.key.get_pressed()
        if keystate[pygame.K_LEFT]:
            self.speedx = -speed
        if keystate[pygame.K_RIGHT]:
            self.speedx = speed
        self.rect.x += self.speedx
        if self.rect.right > WIDTH:
            self.rect.right = WIDTH
        if self.rect.left < 0:
            self.rect.left = 0