# tk_rgb_whirlpool.py

# tk_rgb_whirlpool.py

import tkinter as tk
from PIL import Image, ImageTk, ImageDraw, ImageFilter
import math

ww = 250
hh = 250

root = tk.Tk()
root.title("tk_rgb_whirlpool")
root.geometry("%dx%d+0+0"%(ww,hh))
canvas = tk.Canvas(root, bg='white', width=ww, height=hh)
canvas.pack()

cx, cy = ww//2, hh//2
img = Image.new('RGB', (ww, hh), "white")

rgb = []
def create_rgb():
    t = list(range(0, 256, 50))
    rrr = t[:]
    ggg = t[:]
    bbb = t[:]
    r = g = b = 0
    while 1:
        for r in rrr:
            for g in ggg:
                for b in bbb:
                    if (r,g,b) not in rgb:
                        rgb.append((r,g,b))
                    else:
                        return
                if bbb.index(b) == len(bbb) - 1:
                    bbb = bbb[::-1]
            if ggg.index(g) == len(ggg) - 1:
                ggg = ggg[::-1]
        rrr = rrr[::-1]
create_rgb()
L = len(rgb)

cXY = []
for y in range(hh):
    for x in range(ww):
        distance = ((cx-x)**2+(cy-y)**2)**0.5
        xy2 = math.atan2(x-cx,y-cy)
        cXY.append(((int(distance), xy2),x,y))
cXY.sort()
cXY = [(x,y) for z,x,y in cXY]
LXY = len(cXY)

j = 0
while True:
    for i in range(LXY):
        x, y = cXY[i]
        img.putpixel((x, y), rgb[i%L])

    t = rgb.pop(0)
    rgb.insert(-j, t)
    j = (j+1)%10

    tkimg = ImageTk.PhotoImage(img)
    canvas.create_image((cx, cy), image=tkimg)
    canvas.update()