def start_game():
# 播放音乐pygame.mixer.music.play(-1)# 定义存分数的全局变量global scorescore = 0# 定义寄存玩家键盘输入静止方向的变量，初始为向右run_direction = "right"# 定义贪吃蛇静止方向的变量，初始为玩家键入方向run = run_direction# 实例化贪吃蛇和食物对象head = Snake(randint(0, 30) * 20, randint(0, 20) * 20)# 实例化蛇身长度为2个单位snake_body = [Snake(head.x, head.y + 20), Snake(head.x, head.y + 40)]# 实例化食物列表，列表随着其中食物被吃掉应该一直缩短food_list = [Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))]for i in range(1,24): food_list.append(Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255))))# 实例化单个食物，不便循环内生成单个新食物food = Food(randint(0, 45) * 20, randint(0, 28) * 20, (randint(10, 255), randint(10, 255), randint(10, 255)))while True: window.blit(background, (0,0)) # 监听玩家键盘输入的静止方向值，[能源期货](https://www.gendan5.com/cf/ef.html)并依据输出转为up、down、right或left，不便程序中调用 # pygame.event.get()返回一个列表，寄存本次game执行中程序遇到的一连串事件（按工夫程序顺次寄存） for event in pygame.event.get(): # pygame.QUIT事件是指用户点击窗口右上角的"×" if event.type == pygame.QUIT: # 显示后果界面 show_end() # 若事件类型是按下键盘，分↑ ↓ ← →四种状况探讨 elif event.type == pygame.KEYDOWN: # 若事件类型是按下键盘↑ # key是键值，示意按上来的键值是什么 if event.key == ord('w'): run_direction = "up" # 若事件类型是按下键盘↓ if event.key == ord('s'): run_direction = "down" # 若事件类型是按下键盘← if event.key == ord('a'): run_direction = "left" # 若事件类型是按下键盘→ if event.key == ord('d'): run_direction = "right" # 绘制初始化的25个食物图像(24+1=25) # 随着该列表中的食物被吃掉，列表应该一直pop以革除曾经被吃的事物 for item in food_list: draw_food(item) # 绘制被贪吃蛇吃掉后新增的食物图像 draw_food(food) # 绘制蛇头图像 draw_snake(black, head) # 绘制蛇身图像 for item in snake_body: draw_snake(blue, item) # 判断贪吃蛇原静止方向(run)与玩家键盘输入的静止方向(run_direction)是否违反失常静止状况 if run == "up" and not run_direction == "down": run = run_direction elif run == "down" and not run_direction == "up": run = run_direction elif run == "left" and not run_direction == "right": run = run_direction elif run == "right" and not run_direction == "left": run = run_direction # 插入蛇头地位到蛇身列表中 snake_body.insert(0, Snake(head.x, head.y)) # 依据玩家键入方向进行蛇头xy的更新 if run == "up": head.y -= 20 elif run == "down": head.y += 20 elif run == "left": head.x -= 20 elif run == "right": head.x += 20 # 判断是否死亡 die_flag = False # 遍历寄存贪吃蛇位姿的列表，从第1个开始，(第0个位蛇头) for body in snake_body[1:]: # 如果蛇头的xy和蛇身xy相等，则断定相撞，设置flag为ture if head.x == body.x and head.y == body.y: die_flag = True # 若蛇头的xy在显示窗体外，或flag为true，则显示完结界面，并退出游戏 if die_flag == True or head.x < 0 or head.x > 960 or head.y < 0 or head.y > 600: # 进行播放音乐 pygame.mixer.music.stop() show_end() # die_snake(head, snake_body) # 判断蛇头和食物坐标，若相等，则加分，并生成新的食物 # 定义标记，表明是否找到和蛇头相等的事物 global flag flag = 0 # 如果蛇头和食物重合 for item in food_list: if head.x == item.x and head.y == item.y or head.x == food.x and head.y == food.y: flag = 1 score += 1 # 弹出被吃掉的这个食物 food_list.pop(food_list.index(item)) # 再产生一个食物 food = new_food(head) # 把新食物插入food_list，下一次循环中会更新绘制食物整体 food_list.append(food) break if flag == 0: snake_body.pop() font = pygame.font.SysFont("simHei", 25) mode_title = font.render('失常模式', False, grey) socre_title = font.render('得分: %s' % score, False, grey) window.blit(mode_title, (50, 30)) window.blit(socre_title, (50, 65)) # 更新蛇头蛇身和食物的数据 pygame.display.update() # 通过帧率设置贪吃蛇速度 clock.tick(8)