基于pygame的贪吃蛇小游戏

import pygame import random import os WHITE = (0xff, 0xff, 0xff) BLACK = (0, 0, 0) GREEN = (0, 0xff, 0) RED = (0xff, 0, 0) LINE_COLOR = (0x33, 0x33, 0x33) FPS = 30 HARD_LEVEL = list(range(2, int(FPS / 2), 2)) hardness = HARD_LEVEL[0] D_LEFT, D_RIGHT, D_UP, D_DOWN = 0, 1, 2, 3 # 初始化 pygame.init() # 要想载入音乐，必须要初始化 mixer pygame.mixer.init() WIDTH, HEIGHT = 500, 500 # 贪吃蛇小方块的宽度 CUBE_WIDTH = 20 # 计算屏幕的网格数，网格的大小就是小蛇每一节身体的大小 GRID_WIDTH_NUM, GRID_HEIGHT_NUM = int(WIDTH / CUBE_WIDTH), \ int(HEIGHT / CUBE_WIDTH) # 设置画布 screen = pygame.display.set_mode((WIDTH, HEIGHT)) # 设置标题 pygame.display.set_caption("贪吃蛇") # 设置游戏的根目录为当前文件夹 base_folder = os.path.dirname(__file__) # 这里需要在当前目录下创建一个名为music的目录，并且在里面存放名为back.mp3的背景音乐 music_folder = os.path.join(base_folder, 'music') # 背景音乐 pygame.mixer.music.load(os.path.join(music_folder, 'bgmusic.mp3')) # 小蛇吃食物的音乐 bite_dound = pygame.mixer.Sound(os.path.join(music_folder, 'eatfood.wav')) # 图片 img_folder = os.path.join(base_folder, 'images') back_img = pygame.image.load(os.path.join(img_folder, 'bgpic.png')) snake_head_img = pygame.image.load(os.path.join(img_folder, 'snake.png')) snake_head_img.set_colorkey(BLACK) food_img = pygame.image.load(os.path.join(img_folder, 'food.png')) # 调整图片的大小，和屏幕一样大 background = pygame.transform.scale(back_img, (WIDTH, HEIGHT)) food = pygame.transform.scale(food_img, (CUBE_WIDTH, CUBE_WIDTH)) # 设置一下音量大小，防止过大 pygame.mixer.music.set_volume(0.4) # 设置音乐循环次数 -1 表示无限循环 pygame.mixer.music.play(loops=-1) # 设置定时器 clock = pygame.time.Clock() running = True # 设置计数器 counter = 0 # 设置出事运动方向为向左 direction = D_LEFT # 每次小蛇身体加长的时候，我们就将身体的位置加到列表末尾 snake_body = [] snake_body.append((int(GRID_WIDTH_NUM / 2) * CUBE_WIDTH, int(GRID_HEIGHT_NUM / 2) * CUBE_WIDTH)) # 添加贪吃蛇的“头” # 画出网格线 def draw_grids(): for i in range(GRID_WIDTH_NUM): pygame.draw.line(screen, LINE_COLOR, (i * CUBE_WIDTH, 0), (i * CUBE_WIDTH, HEIGHT)) for i in range(GRID_HEIGHT_NUM): pygame.draw.line(screen, LINE_COLOR, (0, i * CUBE_WIDTH), (WIDTH, i * CUBE_WIDTH)) # 打印身体的函数 def draw_body(direction=D_LEFT): for sb in snake_body[1:]: screen.blit(food, sb) if direction == D_LEFT: rot = 0 elif direction == D_RIGHT: rot = 180 elif direction == D_UP: rot = 270 elif direction == D_DOWN: rot = 90 new_head_img = pygame.transform.rotate(snake_head_img, rot) head = pygame.transform.scale(new_head_img, (CUBE_WIDTH, CUBE_WIDTH)) screen.blit(head, snake_body[0]) # 用于记录食物的位置 food_pos = None # 随机产生一个事物 def generate_food(): while True: pos = (random.randint(0, GRID_WIDTH_NUM - 1), random.randint(0, GRID_HEIGHT_NUM - 1)) # 如果当前位置没有小蛇的身体，我们就跳出循环，返回食物的位置 if not (pos[0] * CUBE_WIDTH, pos[1] * CUBE_WIDTH) in snake_body: return pos # 画出食物的主体 def draw_food(): screen.blit(food, (food_pos[0] * CUBE_WIDTH, food_pos[1] * CUBE_WIDTH, CUBE_WIDTH, CUBE_WIDTH)) # 判断贪吃蛇是否吃到了事物，如果吃到了我们就加长小蛇的身体 def grow(): if snake_body[0][0] == food_pos[0] * CUBE_WIDTH and \ snake_body[0][1] == food_pos[1] * CUBE_WIDTH: # 每次吃到食物，就播放音效 bite_dound.play() return True return False # import pdb; pdb.set_trace() # 先产生一个食物 food_pos = generate_food() draw_food() while running: clock.tick(FPS) for event in pygame.event.get(): if event.type == pygame.QUIT: running = False elif event.type == pygame.KEYDOWN: # 如果有按键被按下了 # 判断按键类型 if event.key == pygame.K_UP: direction = D_UP elif event.key == pygame.K_DOWN: direction = D_DOWN elif event.key == pygame.K_LEFT: direction = D_LEFT elif event.key == pygame.K_RIGHT: direction = D_RIGHT # 判断计数器是否符合要求，如果符合就移动方块位置，（调整方块位置） if counter % int(FPS / hardness) == 0: # 这里需要保存一下尾部的位置，因为下文我们要更新这个位置 # 在这种情况下如果小蛇迟到了食物，需要在尾部增长，那么我们 # 就不知道添加到什么地方了～～ last_pos = snake_body[-1] # 更新小蛇身体的位置 for i in range(len(snake_body) - 1, 0, -1): snake_body[i] = snake_body[i - 1] # 改变头部的位置 if direction == D_UP: snake_body[0] = ( snake_body[0][0], snake_body[0][1] - CUBE_WIDTH) elif direction == D_DOWN: snake_body[0] = ( snake_body[0][0], snake_body[0][1] + CUBE_WIDTH) # top += CUBE_WIDTH elif direction == D_LEFT: snake_body[0] = ( snake_body[0][0] - CUBE_WIDTH, snake_body[0][1]) # left -= CUBE_WIDTH elif direction == D_RIGHT: snake_body[0] = ( snake_body[0][0] + CUBE_WIDTH, snake_body[0][1]) # 限制小蛇的活动范围 if snake_body[0][0] < 0 or snake_body[0][0] >= WIDTH or \ snake_body[0][1] < 0 or snake_body[0][1] >= HEIGHT: # 超出屏幕之外游戏结束 running = False # 限制小蛇不能碰到自己的身体 for sb in snake_body[1:]: # 身体的其他部位如果和蛇头（snake_body[0]）重合就死亡 if sb == snake_body[0]: running = False # 判断小蛇是否吃到了事物，吃到了就成长 got_food = grow() # 如果吃到了事物我们就产生一个新的事物 if got_food: food_pos = generate_food() snake_body.append(last_pos) hardness = HARD_LEVEL[min(int(len(snake_body) / 10), len(HARD_LEVEL) - 1)] # screen.fill(BLACK) screen.blit(background, (0, 0)) draw_grids() # 画小蛇的身体 draw_body(direction) # 画出食物 draw_food() # 计数器加一 counter += 1 pygame.display.update() pygame.quit()