贪吃蛇蛇介绍。

使用pygame库进行游戏界面的绘制和交互。

界面如下：

定义了一些常量，如方块大小（BLOCK_SIZE）、游戏区域宽度（WIDTH）、游戏区域高度（HEIGHT）等。

BLOCK_SIZE = 20
WIDTH = 40
HEIGHT = 30

创建了一个二维数组Blocks用于表示游戏区域的状态，其中每个元素的值代表相应位置的方块的状态，0表示空白，正整数表示蛇身的长度，-1表示食物。

Blocks = [[0] * WIDTH for _ in range(HEIGHT)]

定义了一些全局变量，如移动方向（moveDirection）、食物的位置（food_i、food_j）、是否失败（isFailure）等。

moveDirection = 'D'
food_i, food_j = 0, 0
isFailure = False
screen = None

moveSnake函数用于更新蛇的位置，判断是否吃到食物或碰撞失败。

def moveSnake():
    global isFailure,food_i, food_j
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if Blocks[i][j] > 0:
                Blocks[i][j] += 1
    oldTail_i, oldTail_j, oldHead_i, oldHead_j = 0, 0, 0, 0
    max_value = 0
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if max_value < Blocks[i][j]:
                max_value = Blocks[i][j]
                oldTail_i, oldTail_j = i, j
            if Blocks[i][j] == 2:
                oldHead_i, oldHead_j = i, j

    newHead_i, newHead_j = oldHead_i, oldHead_j

    if moveDirection == 'W':
        newHead_i = oldHead_i - 1
    elif moveDirection == 'S':
        newHead_i = oldHead_i + 1
    elif moveDirection == 'A':
        newHead_j = oldHead_j - 1
    elif moveDirection == 'D':
        newHead_j = oldHead_j + 1

    if (
        newHead_i >= HEIGHT
        or newHead_i < 0
        or newHead_j >= WIDTH
        or newHead_j < 0
        or Blocks[newHead_i][newHead_j] > 0
    ):
        isFailure = True
        return

    Blocks[newHead_i][newHead_j] = 1
    if newHead_i == food_i and newHead_j == food_j:
        food_i = random.randint(2, HEIGHT - 5)
        food_j = random.randint(2, WIDTH - 5)
    else:
        Blocks[oldTail_i][oldTail_j] = 0

startup函数用于初始化游戏，设置初始蛇身和食物的位置，并创建游戏窗口。

def startup():
    global food_i, food_j,screen
    Blocks[10][10] = 1
    for i in range(1, 5):
        Blocks[10][10 - i] = i + 1
    food_i = random.randint(2, HEIGHT - 5)
    food_j = random.randint(2, WIDTH - 5)
    pygame.init()
    screen = pygame.display.set_mode((WIDTH * BLOCK_SIZE, HEIGHT * BLOCK_SIZE))
    pygame.display.set_caption("贪吃小蛇蛇  键盘切换为大写字母  W为上  A为左 S为下 D为右")

show函数用于绘制游戏界面，包括蛇身、食物和游戏结束提示。

def show():
    global screen
    screen.fill((0, 0, 0))
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if Blocks[i][j] > 0:
                color = ((Blocks[i][j] * 10) % 256, 90, 100)
            else:
                color = (111, 111, 111)
            pygame.draw.rect(
                screen,
                color,
                (j * BLOCK_SIZE, i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE),
            )
    pygame.draw.rect(
        screen,
        (0, 255, 0),
        (food_j * BLOCK_SIZE, food_i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE),
    )
    if isFailure:
        font = pygame.font.Font(None, 36)
        text = font.render("GAME OVER~!", True, (255, 0, 0))
        screen.blit(text, (240, 220))
    pygame.display.update()

update_without_input函数用于在没有输入的情况下更新游戏状态，即使蛇自动移动。

def update_without_input():
    if isFailure:
        return
    global waitIndex
    waitIndex = waitIndex + 1 if "waitIndex" in globals() else 1
    if waitIndex == 20:
        moveSnake()
        waitIndex = 1

update_with_input函数用于在有输入的情况下更新游戏状态，根据用户输入改变蛇的移动方向。

def update_with_input():
    global moveDirection
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
    keys = pygame.key.get_pressed()
    if keys[pygame.K_a] and moveDirection != 'D':
        moveDirection = 'A'
        moveSnake()
    elif keys[pygame.K_d] and moveDirection != 'A':
        moveDirection = 'D'
        moveSnake()
    elif keys[pygame.K_w] and moveDirection != 'S':
        moveDirection = 'W'
        moveSnake()
    elif keys[pygame.K_s] and moveDirection != 'W':
        moveDirection = 'S'
        moveSnake()
 

main函数是游戏的主循环，不断调用show、update_without_input和update_with_input函数，并控制游戏的帧率。

def main():
    startup()
    clock = pygame.time.Clock()
    while True:
        show()
        update_without_input()
        update_with_input()
        clock.tick(24)

import random
import pygame

BLOCK_SIZE = 20
WIDTH = 40
HEIGHT = 30

Blocks = [[0] * WIDTH for _ in range(HEIGHT)]
moveDirection = 'D'
food_i, food_j = 0, 0
isFailure = False
screen = None

def moveSnake():
    global isFailure,food_i, food_j
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if Blocks[i][j] > 0:
                Blocks[i][j] += 1
    oldTail_i, oldTail_j, oldHead_i, oldHead_j = 0, 0, 0, 0
    max_value = 0
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if max_value < Blocks[i][j]:
                max_value = Blocks[i][j]
                oldTail_i, oldTail_j = i, j
            if Blocks[i][j] == 2:
                oldHead_i, oldHead_j = i, j

    newHead_i, newHead_j = oldHead_i, oldHead_j

    if moveDirection == 'W':
        newHead_i = oldHead_i - 1
    elif moveDirection == 'S':
        newHead_i = oldHead_i + 1
    elif moveDirection == 'A':
        newHead_j = oldHead_j - 1
    elif moveDirection == 'D':
        newHead_j = oldHead_j + 1

    if (
        newHead_i >= HEIGHT
        or newHead_i < 0
        or newHead_j >= WIDTH
        or newHead_j < 0
        or Blocks[newHead_i][newHead_j] > 0
    ):
        isFailure = True
        return

    Blocks[newHead_i][newHead_j] = 1
    if newHead_i == food_i and newHead_j == food_j:
        food_i = random.randint(2, HEIGHT - 5)
        food_j = random.randint(2, WIDTH - 5)
    else:
        Blocks[oldTail_i][oldTail_j] = 0

def startup():
    global food_i, food_j,screen
    Blocks[10][10] = 1
    for i in range(1, 5):
        Blocks[10][10 - i] = i + 1
    food_i = random.randint(2, HEIGHT - 5)
    food_j = random.randint(2, WIDTH - 5)
    pygame.init()
    screen = pygame.display.set_mode((WIDTH * BLOCK_SIZE, HEIGHT * BLOCK_SIZE))
    pygame.display.set_caption("贪吃小蛇蛇  键盘切换为大写字母  W为上  A为左 S为下 D为右")

def show():
    global screen
    screen.fill((0, 0, 0))
    for i in range(HEIGHT):
        for j in range(WIDTH):
            if Blocks[i][j] > 0:
                color = ((Blocks[i][j] * 10) % 256, 90, 100)
            else:
                color = (111, 111, 111)
            pygame.draw.rect(
                screen,
                color,
                (j * BLOCK_SIZE, i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE),
            )
    pygame.draw.rect(
        screen,
        (0, 255, 0),
        (food_j * BLOCK_SIZE, food_i * BLOCK_SIZE, BLOCK_SIZE, BLOCK_SIZE),
    )
    if isFailure:
        font = pygame.font.Font(None, 36)
        text = font.render("GAME OVER~!", True, (255, 0, 0))
        screen.blit(text, (240, 220))
    pygame.display.update()

def update_without_input():
    if isFailure:
        return
    global waitIndex
    waitIndex = waitIndex + 1 if "waitIndex" in globals() else 1
    if waitIndex == 20:
        moveSnake()
        waitIndex = 1

def update_with_input():
    global moveDirection
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
    keys = pygame.key.get_pressed()
    if keys[pygame.K_a] and moveDirection != 'D':
        moveDirection = 'A'
        moveSnake()
    elif keys[pygame.K_d] and moveDirection != 'A':
        moveDirection = 'D'
        moveSnake()
    elif keys[pygame.K_w] and moveDirection != 'S':
        moveDirection = 'W'
        moveSnake()
    elif keys[pygame.K_s] and moveDirection != 'W':
        moveDirection = 'S'
        moveSnake()

def main():
    startup()
    clock = pygame.time.Clock()
    while True:
        show()
        update_without_input()
        update_with_input()
        clock.tick(24)

if __name__ == "__main__":
    main()