PyGame中的康威生命游戏没有生成正确的图案

Question

我正在用Python和Pygame制作康威的生命游戏，但我发现生成的图案完全不对劲。我检查了代码无数遍，但还是找不到问题出在哪里。

这是其中一个生成状态的截图：

下面是这个游戏的完整代码。

import pygame, sys
from pygame.locals import *
from random import randint
import numpy

#inititalize
pygame.init()
clock = pygame.time.Clock()

#constants
FPS = 10
BLACK = (0,0,0)
RED = (255,0,0)
GREY = (30,30,30)
SCREENX = 640
SCREENY = 480
CELLSIZE = 10
HEIGHT = SCREENY/CELLSIZE
WIDTH = SCREENX/CELLSIZE

#set up window
window = pygame.display.set_mode((SCREENX, SCREENY))
pygame.display.set_caption('Game of Life')
window.fill(BLACK)

#generate random seed
cells = numpy.zeros((WIDTH,HEIGHT), dtype=numpy.int)
for x in range(0,WIDTH):
    for y in range(0,HEIGHT):
        #0 is a dead cell, 1 is an alive cell
        cells[x][y] = randint(0,1)

def findNeighbors(grid, x, y):
    if 0 < x < len(grid) - 1:
        xi = (0, -1, 1)
    elif x > 0:
        xi = (0, -1)
    else:
        xi = (0, 1)

    if 0 < y < len(grid[0]) - 1:
        yi = (0, -1, 1)
    elif y > 0:
        yi = (0, -1)
    else:
        yi = (0, 1)

    for a in xi:
        for b in yi:
            if a == b == 0:
                continue
            yield grid[x + a][y + b]

def update(grid, x, y):
    #determine num of living neighbors
    neighbors = findNeighbors(cells,x,y)
    alive = 0
    for i in neighbors:
        if i == 1:
            alive+=1

    #if current cell is alive
    if grid[x][y] == 1:
        #kill if less than 2 or more than 3 alive neighbors
        if (alive < 2) or (alive > 3):
            return 0
        else:
            return 1
    #if current cell is dead
    elif grid[x][y] == 0:
        #make alive if 3 alive neighbors
        if alive == 3:
            return 1
        else:
            return 0

#main loop
while True:

    #check if user wants to exit
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()

    #update cells
    for x in range(0,WIDTH):
        for y in range(0,HEIGHT):
            cells[x][y] = update(cells,x,y)

    #draw grid
    for x in range(0,SCREENX,CELLSIZE):
        for y in range(0,SCREENY,CELLSIZE):
            #if cell is alive
            if cells[x/CELLSIZE][y/CELLSIZE] == 1:
                #draw red square
                pygame.draw.rect(window, RED, [x, y, CELLSIZE, CELLSIZE])
            else:
                #draw black square
                pygame.draw.rect(window, BLACK, [x, y, CELLSIZE, CELLSIZE])
            #draw square border
            pygame.draw.rect(window, GREY, [x, y, CELLSIZE, CELLSIZE], 1)

    #draw updates
    pygame.display.update()

    #generations per second
    clock.tick(FPS)

我觉得问题不在于findNeighbors这个函数，因为我是在这个StackOverflow的回答中找到的。所以我认为问题可能出在update函数上，但根据游戏规则，我看不出逻辑哪里出错了。

pygame 游戏开发游戏逻辑算法调试状态更新邻居查找康威生命游戏生成算法

PyGame中的康威生命游戏没有生成正确的图案

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