面向过程方法实现贪吃蛇

好的，下面是一个简单的面向过程方法实现贪吃蛇的示例代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 定义游戏窗口尺寸
WIDTH = 600
HEIGHT = 600

# 定义贪吃蛇方块大小
BLOCK_SIZE = 20

# 定义颜色
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
GREEN = (0, 255, 0)
RED = (255, 0, 0)

# 创建游戏窗口
screen = pygame.display.set_mode((WIDTH, HEIGHT))
pygame.display.set_caption("贪吃蛇")

# 定义贪吃蛇初始位置和长度
snake = [
    [WIDTH / 2, HEIGHT / 2],
    [WIDTH / 2 - BLOCK_SIZE, HEIGHT / 2],
    [WIDTH / 2 - 2 * BLOCK_SIZE, HEIGHT / 2]
]

# 定义初始移动方向
direction = "right"

# 定义食物位置
food = [random.randrange(0, WIDTH - BLOCK_SIZE, BLOCK_SIZE),
        random.randrange(0, HEIGHT - BLOCK_SIZE, BLOCK_SIZE)]

# 定义游戏结束状态和分数
game_over = False
score = 0

# 定义绘制贪吃蛇函数
def draw_snake(snake):
    for block in snake:
        pygame.draw.rect(screen, GREEN, [block[0], block[1], BLOCK_SIZE, BLOCK_SIZE])

# 定义绘制食物函数
def draw_food(food):
    pygame.draw.rect(screen, RED, [food[0], food[1], BLOCK_SIZE, BLOCK_SIZE])

# 定义更新分数函数
def update_score(score):
    font = pygame.font.Font(None, 30)
    score_text = font.render("Score: " + str(score), True, WHITE)
    screen.blit(score_text, [10, 10])

# 游戏循环
while not game_over:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT and direction != "right":
                direction = "left"
            elif event.key == pygame.K_RIGHT and direction != "left":
                direction = "right"
            elif event.key == pygame.K_UP and direction != "down":
                direction = "up"
            elif event.key == pygame.K_DOWN and direction != "up":
                direction = "down"

    # 移动贪吃蛇
    if direction == "right":
        snake.insert(0, [snake[0][0] + BLOCK_SIZE, snake[0][1]])
    elif direction == "left":
        snake.insert(0, [snake[0][0] - BLOCK_SIZE, snake[0][1]])
    elif direction == "up":
        snake.insert(0, [snake[0][0], snake[0][1] - BLOCK_SIZE])
    elif direction == "down":
        snake.insert(0, [snake[0][0], snake[0][1] + BLOCK_SIZE])

    # 判断是否吃到食物
    if snake[0] == food:
        food = [random.randrange(0, WIDTH - BLOCK_SIZE, BLOCK_SIZE),
                random.randrange(0, HEIGHT - BLOCK_SIZE, BLOCK_SIZE)]
        score += 10
    else:
        snake.pop()

    # 判断游戏是否结束
    if snake[0][0] < 0 or snake[0][0] >= WIDTH or snake[0][1] < 0 or snake[0][1] >= HEIGHT:
        game_over = True
    for block in snake[1:]:
        if snake[0] == block:
            game_over = True

    # 绘制游戏画面
    screen.fill(BLACK)
    draw_snake(snake)
    draw_food(food)
    update_score(score)
    pygame.display.update()

# 退出游戏
pygame.quit()

这个示例代码实现了一个简单的贪吃蛇游戏，游戏窗口大小为 600x600，贪吃蛇方块大小为 20x20，初始长度为 3，初始移动方向为向右，食物随机生成。玩家通过方向键控制贪吃蛇的移动方向，当贪吃蛇吃到食物时，长度加一，分数加10，食物重新生成。当贪吃蛇碰到边界或者自己时，游戏结束。在游戏画面中，显示当前分数。