python怎么绘制多条蛇

以下是使用pygame库绘制多条蛇的示例代码：

import pygame
import random

# 初始化pygame库
pygame.init()

# 定义窗口大小和标题
window_size = (800, 600)
window_title = "Snake Game"
screen = pygame.display.set_mode(window_size)
pygame.display.set_caption(window_title)

# 定义蛇和食物的颜色和大小
snake_color = (0, 255, 0)
food_color = (255, 0, 0)
block_size = 20

# 定义多条蛇的数量
num_snakes = 3

# 定义蛇的初始位置和移动速度
snake_positions = []
snake_speeds = []
for i in range(num_snakes):
    x = random.randint(0, window_size[0] // block_size - 1) * block_size
    y = random.randint(0, window_size[1] // block_size - 1) * block_size
    snake_positions.append([(x, y)])
    snake_speeds.append((block_size, 0))

# 定义食物的初始位置
food_position = (random.randint(0, window_size[0] // block_size - 1) * block_size,
                 random.randint(0, window_size[1] // block_size - 1) * block_size)

# 定义游戏循环标志变量
game_over = False

# 游戏循环
while not game_over:
    # 处理游戏事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True

    # 获取按键状态
    keys = pygame.key.get_pressed()

    # 更新蛇的位置
    for i in range(num_snakes):
        # 获取蛇头位置和速度
        head_position = snake_positions[i][-1]
        speed = snake_speeds[i]

        # 根据按键状态更新速度
        if keys[pygame.K_LEFT]:
            speed = (-block_size, 0)
        elif keys[pygame.K_RIGHT]:
            speed = (block_size, 0)
        elif keys[pygame.K_UP]:
            speed = (0, -block_size)
        elif keys[pygame.K_DOWN]:
            speed = (0, block_size)

        # 计算新的蛇头位置
        new_head_position = (head_position[0] + speed[0], head_position[1] + speed[1])

        # 判断是否撞墙
        if new_head_position[0] < 0 or new_head_position[0] >= window_size[0] \
                or new_head_position[1] < 0 or new_head_position[1] >= window_size[1]:
            game_over = True
            break

        # 判断是否吃到食物
        if new_head_position == food_position:
            food_position = (random.randint(0, window_size[0] // block_size - 1) * block_size,
                             random.randint(0, window_size[1] // block_size - 1) * block_size)
        else:
            snake_positions[i].pop(0)

        # 添加新的蛇头
        snake_positions[i].append(new_head_position)
        snake_speeds[i] = speed

    # 绘制游戏场景
    screen.fill((255, 255, 255))
    pygame.draw.rect(screen, food_color, (food_position[0], food_position[1], block_size, block_size))

    for i in range(num_snakes):
        for j in range(len(snake_positions[i])):
            pygame.draw.rect(screen, snake_color, (snake_positions[i][j][0], snake_positions[i][j][1], block_size, block_size))

    # 更新屏幕显示
    pygame.display.flip()

# 退出pygame库
pygame.quit()

在上面的示例代码中，我们使用了一个列表`snake_positions`来存储多条蛇的位置，另外还定义了一个列表`snake_speeds`来存储多条蛇的速度。在更新蛇的位置时，我们需要分别计算每条蛇的新位置，并更新它们的位置和速度。在绘制游戏场景时，我们需要分别绘制每条蛇的身体。