# Tk_grayscale_patterns.py

# Tk_grayscale_patterns.py

from tkinter import *
from PIL import Image, ImageTk
import math
from itertools import combinations

ww = 500
hh = 500

sz = 10

root = Tk()
root.geometry("%dx%d+0+0"%(ww,hh))
canvas = Canvas(root, width=ww, height=hh)
canvas.pack()


t = range(0,256,25)
TTT = []
for grey in t:
    TTT += [(grey, grey, grey)]
TTT *= (ww+hh)

xy = []
for y in range(0,hh,sz):
    for x in range(0,ww+1,sz):
        xy += [(x,y)]

o = [i for i in range(255)]
o = o[1:-1] + o[::-1]
L = len(o)

def make_rgb():
    return '#%02X%02X%02X'%(r,g,b)

aaa = []
bbb = []
i = 0
seq = 1 # sequences
sub = 1
while 1:
    ttt = TTT[:]
    if (bbb in aaa) or (sub > 25):
        aaa = []
        seq += 1
        sub = 1
    print (seq, sub)
    aaa += [bbb[:]]
    bbb = []
    canvas.delete('all')
    for x,y in xy:
        r,g,b = ttt.pop(-i)
        bbb += [r]
        i = (i-1)%seq
        canvas.create_rectangle((x, y, x-sz, y+sz), fill=make_rgb(), width=0)
    sub += 1
    canvas.update()