# tk_native_contour.py

# tk_native_contour.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("native_contour")
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]
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()
Lc = len(rgb)

def contour():
    pixels = img2.load()
    for y in range(hh):
        for x in range(ww):
            r,g,b = pixels[x,y]
            r,g,b = rgb[(r+g+b)%Lc]
            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))
    contour()
    tkimg = ImageTk.PhotoImage(img2)
    canvas.create_image((cx, cy), image=tkimg)
    canvas.update()

root.mainloop()