import pygame
from color import Color
from random import randint
···
window_width = 400
window_height = 600

class Direction:
"""方向类"""
UP = 273
DOWN = 274
RIGHT = 275
LEFT = 276

class Ball:
def init(self, center_x, center_y, radius, bg_color=Color.random_color()):
self.center_x = center_x
self.center_y = center_y
self.radius = radius
self.bg_color = bg_color
self.is_move = True # 是否移动
self.move_direction = Direction.DOWN
self.speed = 5

def disappear(self, window):
    """
    球从指定界面消失
    :param window:
    :return:
    """
    pygame.draw.circle(window, Color.white, (self.center_x, self.center_y), self.radius)

def show(self, window):
    """
    小球显示
    :param window:
    :return:
    """
    pygame.draw.circle(window, self.bg_color, (self.center_x, self.center_y), self.radius)

def move(self, window):
    """
    小球移动
    :param window:
    :return:
    """
    # 让移动前的球消失
    self.disappear(window)
    if self.move_direction == Direction.DOWN:
        self.center_y += self.speed
    elif self.move_direction == Direction.UP:
        self.center_y -= self.speed
    elif self.move_direction == Direction.LEFT:
        self.center_x -= self.speed
    else:
        self.center_x += self.speed

    # 移动后重新显示球
    self.show(window)

@classmethod
def creat_enemy_ball(cls):
    r = randint(10, 25)
    x = randint(r, int(window_width - r))
    y = randint(r, int(window_height - r))
    enemy = cls(x, y, r, Color.random_color())
    enemy.is_move = False
    return enemy

def main():
pygame.init()
window = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption('事件')
window.fill(Color.white)

# 先显示一个的球
ball = Ball(100, 100, 30)
ball.show(window)

pygame.display.flip()
# 计时
time = 0
# 所有被吃的球
all_enemy = []
while True:
    time += 1

    # 每隔100个运行单位移动一次
    if time % 100 == 0:
        if ball.is_move:
            # 让球动起来
            ball.move(window)
            pygame.display.update()

    if time == 10000:
        time = 0
        enemy = Ball.creat_enemy_ball()
        all_enemy.append(enemy)
        enemy.show(window)


    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == Direction.DOWN or event.key == Direction.UP or event.key == Direction.LEFT or event.key == Direction.RIGHT:
                # ball.is_move = True
                ball.move_direction = event.key
        elif event.type == pygame.KEYUP:
            if event.key == Direction.DOWN or event.key == Direction.UP or event.key == Direction.LEFT or event.key == Direction.RIGHT:
                # ball.is_move = False
                pass

···