# Tk_seq_shuffle_8.py

# Tk_seq_shuffle_8.py

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

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))

wave = []
for z in range(10):
    wave.append([z]*(10*(12-z)))
wave = sum(wave[1:-1]+wave[::-1], [])[::-1]
Lwave = len(wave)

black = [(0,)*3]
white = [(255,)*3]

colors = []
for i in range(255):
    colors += [(i,i,i)]
colors = colors[1:-1]+colors[::-1]
Lc = len(colors)

iii = 1

rgb = [(255,255,255)]*(ww*hh)

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