# Tk_seq_shuffle_4.py

# Tk_seq_shuffle_4.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 = [(255,0,0),(0,0,255),(255,255,0)]
colors = [(255,0,0),(0,0,255),(255,255,0)]*10000
L = len(colors)

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

j = dict([(colors[i],1) for i in (0,1,2)])
y_switch = dict([(i,j) for i in range(ww)])
# print (y_switch)
color = {}

while 1:
    ttt = []
    for x in range(ww):
        i += 1
        t = colors.pop(i%L)
        y_switch[x][t] -= 1
        if y_switch[x][t] < 1:
            y_switch[x] = dict([(COLORS[i],15) for i in (0,1,2)])
            y_switch[x][t] += 5
            color[x] = t
        ttt += [color[x]]
        colors += [t]
    rgb.extend(ttt)
    rgb = rgb[-ww*hh:]
    draw()