12.02贪吃蛇

import pygame
import random
import sys

# 初始化pygame
pygame.init()

# 设置屏幕大小
screen_width, screen_height = 640, 480
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption("贪吃蛇游戏")

# 设置颜色
black = (0, 0, 0)
white = (255, 255, 255)
red = (255, 0, 0)

# 设置游戏参数
snake_block = 40
snake_speed = 10  # 增加游戏速度，以提高游戏体验

# 初始化蛇的位置
snake_list = [[50, 50], [40, 50], [30, 50]]
direction = 'RIGHT'

# 初始化食物位置
def generate_food_position():
    return [random.randrange(0, screen_width // snake_block) * snake_block,
            random.randrange(0, screen_height // snake_block) * snake_block]

food_position = generate_food_position()
food_spawn = True

# 分数
score = 0

# 游戏主循环
running = True
while running:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        if 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'

    # 更新蛇头位置
    if direction == 'RIGHT':
        snake_head = [snake_list[-1][0] + snake_block, snake_list[-1][1]]
    elif direction == 'LEFT':
        snake_head = [snake_list[-1][0] - snake_block, snake_list[-1][1]]
    elif direction == 'UP':
        snake_head = [snake_list[-1][0], snake_list[-1][1] - snake_block]
    elif direction == 'DOWN':
        snake_head = [snake_list[-1][0], snake_list[-1][1] + snake_block]

    # 确保蛇头和食物的位置都是 snake_block 的倍数
    snake_head[0] = (snake_head[0] // snake_block) * snake_block
    snake_head[1] = (snake_head[1] // snake_block) * snake_block

    # 检查是否撞到墙壁或自己
    if (snake_head[0] < 0 or snake_head[0] >= screen_width or
            snake_head[1] < 0 or snake_head[1] >= screen_height or
            snake_head in snake_list):
        running = False

    # 检查是否吃到食物
    if snake_head == food_position:
        score += 1
        food_spawn = False
    else:
        snake_list.pop(0)

    snake_list.append(snake_head)

    # 生成新食物
    if not food_spawn:
        food_position = generate_food_position()
        food_spawn = True

    # 绘制游戏画面
    screen.fill(black)

    # 绘制蛇
    for segment in snake_list:
        pygame.draw.rect(screen, white, [segment[0], segment[1], snake_block, snake_block])

    # 绘制食物
    pygame.draw.rect(screen, red, [food_position[0], food_position[1], snake_block, snake_block])

    # 显示分数
    font = pygame.font.SysFont(None, 36)  # 使用默认字体
    score_text = font.render(f"Score: {score}", True, white)
    screen.blit(score_text, [10, 10])

    pygame.display.update()
    pygame.time.Clock().tick(snake_speed)

pygame.quit()