最近帮人做了个贪吃蛇的游戏（交作业用），很简单，界面如下：

开始界面：

游戏中界面：

是不是很简单、朴素。（欢迎大家访问GitHub）

游戏是基于PyGame框架制作的，程序核心逻辑如下：

• 游戏界面分辨率是640*480，蛇和食物都是由1个或多个20*20像素的正方形块儿（为了方便，下文用点表示20*20像素的正方形块儿）组成，这样共有32*24个点，使用pygame.draw.rect来绘制每一个点；
• 初始化时蛇的长度是3，食物是1个点，蛇初始的移动的方向是右，用一个数组代表蛇，数组的每个元素是蛇每个点的坐标，因此数组的第一个坐标是蛇尾，最后一个坐标是蛇头；
• 游戏开始后，根据蛇的当前移动方向，将蛇运动方向的前方的那个点append到蛇数组的末位，再把蛇尾去掉，蛇的坐标数组就相当于往前挪了一位；
• 如果蛇吃到了食物，即蛇头的坐标等于食物的坐标，那么在第2点中蛇尾就不用去掉，就产生了蛇长度增加的效果；食物被吃掉后，随机在空的位置（不能与蛇的身体重合）再生成一个；
• 通过PyGame的event监控按键，改变蛇的方向，例如当蛇向右时，下一次改变方向只能向上或者向下；
• 当蛇撞上自身或墙壁，游戏结束，蛇头装上自身，那么蛇坐标数组里就有和舌头坐标重复的数据，撞上墙壁则是蛇头坐标超过了边界，都很好判断；
• 其他细节：做了个开始的欢迎界面；食物的颜色随机生成；吃到实物的时候有声音提示等。

代码：

#!/usr/bin/env python # -*- coding:utf-8 -*- """ @version: v1.0 @author: Harp@contact: liutao25@baidu.com @software: PyCharm @file: MySnake.py @time: 2018/1/15 0015 23:40 """import pygamefrom os import pathfrom sys import exitfrom time import sleepfrom random import choicefrom itertools import productfrom pygame.locals import QUIT, KEYDOWNdef direction_check(moving_direction, change_direction): directions = [['up', 'down'], ['left', 'right']] if moving_direction in directions[0] and change_direction in directions[1]: return change_direction elif moving_direction in directions[1] and change_direction in directions[0]: return change_direction return moving_directionclass Snake: colors = list(product([0, 64, 128, 192, 255], repeat=3))[1:-1] def __init__(self): self.map = {(x, y): 0 for x in range(32) for y in range(24)} self.body = [[100, 100], [120, 100], [140, 100]] self.head = [140, 100] self.food = [] self.food_color = [] self.moving_direction = 'right' self.speed = 4 self.generate_food() self.game_started = False def check_game_status(self): if self.body.count(self.head) > 1: return True if self.head[0] < 0 or self.head[0] > 620 or self.head[1] < 0 or self.head[1] > 460: return True return False def move_head(self): moves = { 'right': (20, 0), 'up': (0, -20), 'down': (0, 20), 'left': (-20, 0) } step = moves[self.moving_direction] self.head[0] += step[0] self.head[1] += step[1] def generate_food(self): self.speed = len(self.body) // 16 if len(self.body) // 16 > 4 else self.speed for seg in self.body: x, y = seg self.map[x//20, y//20] = 1 empty_pos = [pos for pos in self.map.keys() if not self.map[pos]] result = choice(empty_pos) self.food_color = list(choice(self.colors)) self.food = [result[0]*20, result[1]*20]def main(): key_direction_dict = { 119: 'up', # W 115: 'down', # S 97: 'left', # A 100: 'right', # D 273: 'up', # UP 274: 'down', # DOWN 276: 'left', # LEFT 275: 'right', # RIGHT } fps_clock = pygame.time.Clock() pygame.init() pygame.mixer.init() snake = Snake() sound = False if path.exists('eat.wav'): sound_wav = pygame.mixer.Sound("eat.wav") sound = True title_font = pygame.font.SysFont('arial', 32) welcome_words = title_font.render('Welcome to My Snake', True, (0, 0, 0), (255, 255, 255)) tips_font = pygame.font.SysFont('arial', 24) start_game_words = tips_font.render('Click to Start Game', True, (0, 0, 0), (255, 255, 255)) close_game_words = tips_font.render('Press ESC to Close', True, (0, 0, 0), (255, 255, 255)) gameover_words = title_font.render('GAME OVER', True, (205, 92, 92), (255, 255, 255)) win_words = title_font.render('THE SNAKE IS LONG ENOUGH AND YOU WIN!', True, (0, 0, 205), (255, 255, 255)) screen = pygame.display.set_mode((640, 480), 0, 32) pygame.display.set_caption('My Snake') new_direction = snake.moving_direction while 1: for event in pygame.event.get(): if event.type == QUIT: exit() elif event.type == KEYDOWN: if event.key == 27: exit() if snake.game_started and event.key in key_direction_dict: direction = key_direction_dict[event.key] new_direction = direction_check(snake.moving_direction, direction) elif (not snake.game_started) and event.type == pygame.MOUSEBUTTONDOWN: x, y = pygame.mouse.get_pos() if 213 <= x <= 422 and 304 <= y <= 342: snake.game_started = True screen.fill((255, 255, 255)) if snake.game_started: snake.moving_direction = new_direction # 在这里赋值，而不是在event事件的循环中赋值，避免按键太快 snake.move_head() snake.body.append(snake.head[:]) if snake.head == snake.food: if sound: sound_wav.play() snake.generate_food() else: snake.body.pop(0) for seg in snake.body: pygame.draw.rect(screen, [0, 0, 0], [seg[0], seg[1], 20, 20], 0) pygame.draw.rect(screen, snake.food_color, [snake.food[0], snake.food[1], 20, 20], 0) if snake.check_game_status(): screen.blit(gameover_words, (241, 310)) pygame.display.update() snake = Snake() new_direction = snake.moving_direction sleep(3) elif len(snake.body) == 512: screen.blit(win_words, (33, 210)) pygame.display.update() snake = Snake() new_direction = snake.moving_direction sleep(3) else: screen.blit(welcome_words, (188, 100)) screen.blit(start_game_words, (236, 310)) screen.blit(close_game_words, (233, 350)) pygame.display.update() fps_clock.tick(snake.speed)if __name__ == '__main__': main()

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