# tk_ImageFilter_GaussianBlur.py

# tk_ImageFilter_GaussianBlur.py

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

root = Tk()

ww = 500
hh = 500

canvas = Canvas(root, width=ww, height=hh)
canvas.pack()

x, y = int(ww/2), int(hh/2)

def cursor_pos(event):
    global x, y
    x = event.x
    y = event.y

rnd = list([i*j for i in range(50,80) for j in (-1,1)])
rnd.sort()

o = [i for i in range(256)]
o = o[1:-1]+o[::-1]
L = len(o)

def to_zero(n):
    """
    if n == 0:
        return 0
    """
    if int(n) > 0:
        return n-1
    return n+1

rrr = ggg = bbb = 128

yscan = [(128,128,128)] * ww

img = Image.new("RGB",(ww,hh), "white")

def draw():
    img.putdata(rgb)
    img2 = img.filter(ImageFilter.GaussianBlur(radius=7))
    imgTk = ImageTk.PhotoImage(img2)
    canvas.create_image(0, 0, anchor=NW, image=imgTk)
    canvas.update()

ccc = 0
while 1:
    rgb = []
    for i in range(hh):
        for j in range(ww):

            if not rrr:
                rrr = rnd.pop(ccc%2)
                rnd.append(rrr)
                ccc = ccc + 1
            if not ggg:
                ggg = rnd.pop(ccc%2)
                rnd.append(ggg)
                ccc = ccc + 1
            if not bbb:
                bbb = rnd.pop(ccc%2)
                rnd.append(bbb)
                ccc = ccc + 1

            r,g,b = yscan[j]

            rrr = to_zero(rrr)
            r2 = (r+rrr)
            ggg = to_zero(ggg)
            g2 = (g+ggg)
            bbb = to_zero(bbb)
            b2 = (b+bbb)

            ccc += 1

            t = (o[int(r2)%L], o[int(g2)%L], o[int(b2)%L])
            yscan[j] = t
            rgb += [t]

    draw()