# tk_layered_contours.py

# tk_layered_contours.py

from tkinter import *
from PIL import Image, ImageTk, ImageFilter, ImageDraw
import math

ww = 512
hh = 512
cx, cy = ww//2, hh//2

root = Tk()
root.title("layered_contours")
root.geometry("%dx%d+0+0"%(ww,hh))

img = Image.new('RGB', (ww, hh), (0, 0, 0))
draw = ImageDraw.Draw(img)
blur_radius = 0.06 * min(img.size)

canvas = Canvas(root, width=ww, height=hh, bg='white')
canvas.pack(side=LEFT, fill=BOTH, expand=True)

def rgb2hex(r,g,b):
    return '#%02X%02X%02X'%(r,g,b)
rgb = range(0, 256, 50)
colors = [rgb2hex(r, g, b) for r in rgb for g in rgb for b in rgb]
Lc = len(colors)

def layered_contours():
    intensity = 20
    pixels = img2.load()
    for y in range(hh):
        for x in range(ww):
            r,g,b = pixels[x,y]
            r,g,b = [i//intensity*intensity for i in (r,g,b)]
            pixels[x,y] = (r,g,b)

sz = 64
i = 0
xy = range(0, 512, sz)
while 1:
    for y in xy:
        i = (i + 1) % 11
        for x in xy:
            color = colors.pop(i)
            colors.append(color)
            draw.rectangle((x, y, x+sz, y+sz), fill=color, outline=color)
            i = (i + 1) % 11

    img2 = img.filter(ImageFilter.GaussianBlur(radius=blur_radius))
    layered_contours()
    tkimg = ImageTk.PhotoImage(img2)
    canvas.create_image((cx, cy), image=tkimg)
    canvas.update()

root.mainloop()