附加到lis的蛇游戏问题

Question

我正在尝试做我的第一个游戏，所以我认为蛇游戏将是一个很好的可行的挑战（猜我错了）开始。你知道吗

问题似乎是，当我将蛇的一部分附加到包含所有部分的body列表时，它似乎会多次附加它。这使得所有的部分在同一个位置，它失去了“蛇”身体的整个休息。我该如何解决这个问题，或者代码有其他问题。你知道吗

import pygame
pygame.init()


class Cube():
    pos = [0, 0]

    def __init__(self, x, y, color=(255, 0, 0)):
        self.color = color
        self.pos[0] = x
        self.pos[1] = y

    def draw(self):
        x = (self.pos[0] * xSizeBtwn) + 2
        y = (self.pos[1] * ySizeBtwn) + 2
        pygame.draw.rect(win, self.color, (x, y, xSizeBtwn - 2, ySizeBtwn - 2))
        pygame.display.update()


class Snake():
    body = []
    pos = []

    def __init__(self, color=(255, 0, 0)):
        self.color = color
        self.dirx = 1
        self.diry = 0
        self.length = 10
        self.pos = [3, 3]

    def move(self):
        keys = pygame.key.get_pressed()
        if keys[pygame.K_a]:
            self.dirx = -1
            self.diry = 0
            print("moved a")

        elif keys[pygame.K_d]:
            self.dirx = 1
            self.diry = 0
            print("moved d")

        elif keys[pygame.K_w]:
            self.diry = -1
            self.dirx = 0
            print("moved s")

        elif keys[pygame.K_s]:
            self.diry = 1
            self.dirx = 0
            print("moved s")

        self.newPosX = self.pos[0] + self.dirx
        self.newPosY = self.pos[1] + self.diry
        self.pos[0] = self.newPosX
        self.pos[1] = self.newPosY

        present = True
        for b in self.body:
            print(b.pos, self.newPosX, self.newPosY)
            if b.pos[0] == self.newPosX and b.pos[1] == self.newPosY:
                print("true")
                present = False
        # the problem is right here (i think)
        if present:
            self.body.append(Cube(self.newPosX, self.newPosY, self.color))

        if len(self.body) > self.length:
            self.body.pop(0)

    def draw(self):
        for b in self.body:
            b.draw()
            print(b.pos)


def drawAll():
    win.fill((30, 30, 30))
    drawGrid()
    pygame.display.update()


def drawGrid():

    x = 0
    y = 0
    for n in range(rows - 1):
        y += ySizeBtwn
        pygame.draw.line(win, (255, 255, 255), (0, (int)(y)), (gameHeight, (int)(y)))
    for n in range(columns - 1):
        x += xSizeBtwn
        pygame.draw.line(win, (255, 255, 255), ((int)(x), 0), ((int)(x), gameWidth))


def main():

    global gameWidth, gameHeight, columns, rows, xSizeBtwn, ySizeBtwn, win
    gameWidth = 500
    gameHeight = 500
    columns = 15
    rows = 15
    xSizeBtwn = gameWidth / columns
    ySizeBtwn = gameHeight / rows

    win = pygame.display.set_mode((gameWidth, gameHeight))
    pygame.display.set_caption("Snake")

    clock = pygame.time.Clock()
    run = True
    snake = Snake()
    while run:
        pygame.time.delay(100)
        clock.tick(60)
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                run = False

        drawAll()
        snake.move()
        snake.draw()


main()
pygame.quit()

抱歉，代码太乱了，我刚开始编程。你知道吗

此外，如果你有任何提示，它将是非常有用的。你知道吗

Answer 1

以下初始化可能没有执行您认为它们正在执行的操作：these variables will be shared across classes。你知道吗

class Cube():
    pos = [0, 0]
    ...

class Snake():
    body = []
    pos = []
    ...

相反，应该在__init__函数中初始化这些变量，如下所示：

class Cube:
    def __init__(self, x, y, color=(255, 0, 0)):
        self.pos = [0, 0]
        self.color = color
        self.pos[0] = x
        self.pos[1] = y
...


class Snake:
    def __init__(self, color=(255, 0, 0)):
        self.color = color
        self.dirx = 1
        self.diry = 0
        self.length = 10
        self.pos = [3, 3]
        self.body = []

结果