PyGame贪吃蛇的实现代码示例

Python  /  管理员 发布于 5年前   178

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: [email protected] @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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