# Tk_seq_shuffle_7.py

# Tk_seq_shuffle_7.py

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

ww = 600
hh = 600

def draw():
    image.putdata(rgb)
    photo = ImageTk.PhotoImage(image)
    canvas.create_image(0,0,image=photo,anchor=NW)
    canvas.update()


root = Tk()
root.title("Tk_seq_shuffle")
root.geometry("%dx%d+0+0"%(ww,hh))

canvas = Canvas(root, width=ww, height=hh)
canvas.pack()

image = Image.new("RGB", (ww,hh), (255,255,255))

colors = []
for black in range(0,100):
    for white in range(4,50):
        t = [(0,)*3]*black+[(255,)*3]*white
        colors += [t]
colors *= 1200

i = 1
rgb = [(0,0,0)]*(ww*hh)

while 1:
    ttt = []
    while len(ttt) < ww+100:
        i += 1
        t = colors.pop(i%(ww))
        colors += [t]
        ttt.extend(t)
    rgb.extend(ttt[100:ww+100])
    rgb = rgb[-ww*hh:]
    draw()
    t = colors.pop(i%(ww))
    colors += [t]
    t = colors.pop(i%(ww))
    colors += [t]