# Tk_basic_color_patterns.py

# Tk_basic_color_patterns.py

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

ww = 600
hh = 600

sz = 5

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

seq = 1 # sequences

colors = 'red orange yellow green blue purple'.split()*(600*4)
L = len(colors)

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

i = 0
while 1:
    print (seq)
    seq += 1
    canvas.delete('all')
    for k in range(Lxy):
        color = colors[0]
        colors.insert(L-i, colors.pop(0))
        i = (i-1)%99
        x,y = xy[k]
        canvas.create_rectangle((x, y, x-sz, y+sz), fill=color, width=0)
    canvas.update()