增加长度的蛇在蛇游戏

Question

我现在的代码是，吃苹果增加的长度都是在蛇头后面一条直线上。我如何使它是一个像正常的蛇游戏线索？如果有人能帮我解决问题而不是粘贴，那就太好了。你知道吗

这是我的完整代码（它使用png文件，所以如果您尝试它，它可能不会运行）

import pygame, random, time

pygame.init()

screenWidth = 500
screenHeight = 500
window = pygame.display.set_mode((screenWidth, screenHeight))
pygame.display.set_caption("Snake")
x = random.randint(30, 440)
y = random.randint(30, 44)
snakex = x-30
snakey = y
previousx = snakex
previousy = snakey
run = True
appleNeeded = True
direction = "right"
lengthNeeded = False
length1 = True
lengthAmount = 3
check = True


snake_body = []
#Create images (Snake head, apple, and snake tail)

#class SnakeHead(pygame.sprite.Sprite):

#   def __init__(self, ):
snakeHeadUp = pygame.image.load("snakeHeadUp.png")
snakeHeadUp = pygame.transform.scale(snakeHeadUp, (30, 30))
snakeHeadLeft = pygame.image.load("snakeHeadLeft.png")
snakeHeadLeft = pygame.transform.scale(snakeHeadLeft, (30, 30))
snakeHeadRight = pygame.image.load("snakeHeadRight.png")
snakeHeadRight = pygame.transform.scale(snakeHeadRight, (30, 30))
snakeHeadDown = pygame.image.load("snakeHeadDown.png")
snakeHeadDown = pygame.transform.scale(snakeHeadDown, (30, 30))
apple = pygame.image.load("apple.png")
apple = pygame.transform.scale(apple, (30, 30))
snakeHead = snakeHeadRight

while run:
    if check == True:
        snake_body.append((x, y))
        check = False

    #Create screen with boundaries
    window.fill((0, 0, 255))

    #Create snake head (sprite)

    #Create snake


    #Create apple randomly (either rect or sprite) and if needed
    if appleNeeded == True:
        randomx = random.randint(30, 440)
        randomy = random.randint(30, 440)
        if randomx > 5:
            randomx = randomx - (randomx % 5)
        elif randomx < 5:
            randomx = randomx + (5 % randomx)
        if randomy > 5:
            randomy = randomy - (randomy % 5)
        elif randomy < 5:
            randomy = randomy + (5 % randomy)

        appleNeeded = False
    window.blit(apple, (randomx, randomy))

    #Determine if snake head has touched apple
    if x-15 >= randomx-30 and x-15 < randomx and y-15 >= randomy-30 and y-15 < randomy:
        appleNeeded = True
        lengthAmount += 1
        snake_body.append("1")

    #Check for key updates

    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT]:
        direction = "left"
        snakeHead = snakeHeadLeft
    if keys[pygame.K_RIGHT]:
        direction = "right"
        snakeHead = snakeHeadRight
    if keys[pygame.K_UP]:
        direction = "up"
        snakeHead = snakeHeadUp
    if keys[pygame.K_DOWN]:
        direction = "down"
        snakeHead = snakeHeadDown

    if direction == "left":
        x -= 5
        snakex = x+30
        snakey = y
    elif direction == "right":  
        x += 5
        snakex = x-30
        snakey = y
    elif direction == "up":
        y -= 5
        snakex = x
        snakey = y+30
    elif direction == "down":
        y += 5
        snakex = x
        snakey = y-30


    #Update snake length
    window.blit(snakeHead, (x, y))
    for i in range(lengthAmount):
        if i == 0:
            previousx = snakex - (30 * i)
            previousy = snakey
        if direction == "left":
            previousx = snakex + (30 * i)
            previousy = snakey
        elif direction == "right":  
            previousx = snakex - (30 * i)
            previousy = snakey
        elif direction == "up":
            previousx = snakex 
            previousy = snakey + (30 * i)
        elif direction == "down":
            previousx = snakex  
            previousy = snakey - (30 * i)

        for body in snake_body:
            pygame.draw.rect(window, (0, 175, 0), (previousx, previousy, 30, 30))


    #Don't allow snake to leave the window (game over if True)
    if x >= 470 or x <= 0 or y <= 0 or y >= 470:
        run = False

    #Don't allow snake to eat itself (game over if True)


    pygame.display.update()

    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            run = False

pygame.quit()

Answer 1

对你来说这有点棘手。你知道吗

您必须将蛇遇到的所有位置存储在列表中。
蛇的一部分的长度是30，一个台阶的大小是5。所以列表中的第六个位置是蛇身体的一个部分的位置：

snake_pos = []
while run:

    # [...]

    # append position at the head of the list
    snake_pos = [(x, y)] + snake_pos

    # draw the parts of the body at each 6th position of the list 
    for i in range(lengthAmount):
        pi = min((i+1)*6, len(snake_pos)-1)
        pygame.draw.rect(window, (0, 175, 0), (*snake_pos[pi], 30, 30))

    #window.blit(snakeHead, (x, y))
    pygame.draw.rect(window, (175, 50, 0), (x, y, 30, 30))

    # delete all paositons from the list which are not further need
    del snake_pos[lengthAmount*6:]