# tk_rgb_spiral_test.py

# tk_rgb_spiral_test.py

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

ww = 640
hh = 640

root = tk.Tk()
root.title("tk_rgb_spiral_test")
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 = [(255, 0, 0), (255, 127, 0), (255, 255, 0), (127, 255, 0), (0, 255, 0), (0, 255, 127), (0, 255, 255), (0, 127, 255),  (0, 0, 255)] * (ww*hh)
rgb = rgb[:(ww*hh)]
rgb.sort()
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)

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

    a = rgb[::2]
    b = rgb[1::2]
    rgb = []
    rgb.extend(a)
    rgb.extend(b)

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