# tk_evolving_semi_blotches.py

# tk_evolving_semi_blotches.py

from tkinter import Tk, Canvas
from PIL import Image, ImageTk
import random

ww, hh = 600, 600
root = Tk()
root.title("# tk_evolving_semi_blotches.py")
ww0, hh0 = ww // 3, hh // 3
canvas = Canvas(root, width=ww, height=hh)
canvas.pack()

while True:
    feed = 0.000001

    grid = [[random.randint(0, 255) for _ in range(ww0)] for _ in range(hh0)]
    new_grid = [[0 for _ in range(ww0)] for _ in range(hh0)]

    stop = 0
    while True:
        pil_img = Image.new('L', (ww0, hh0), 'white')
        pixels = pil_img.load()
        for i in range(1, hh0 - 1):
            for j in range(1, ww0 - 1):
                total = -(grid[i-1][j-1] + grid[i-1][j] + grid[i-1][j+1] + grid[i][j-1] + grid[i][j+1] + grid[i+1][j-1] + grid[i+1][j] + grid[i+1][j+1] + feed) / 50
                new_grid[i][j] = grid[i][j] + total
                try:
                    pixels[i, j] = int(new_grid[i][j])
                except:
                    stop = 1
        if stop:
            break
        else:
            grid = new_grid[:]
            pil_img = pil_img.resize((ww, hh), Image.BICUBIC)
            tk_img = ImageTk.PhotoImage(pil_img)
            canvas.create_image(0, 0, anchor='nw', image=tk_img)
            canvas.update()