# tk_random_infinite_alpha_zoom.py

# tk_random_infinite_alpha_zoom.py

import tkinter as tk
from PIL import Image, ImageTk
import random

ww = 400
hh = 400

root = tk.Tk()
root.title("tk_random_infinite_zoom")
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

fg_img = Image.new('RGBA', (ww, hh), (0, 0, 0, 0))
bg_img = Image.new('RGBA', (ww, hh), (255, 255, 255, 255)) # change to RGBA to allow for additive blending

rgb = [i for i in range(0, 256, 5)]
colors = [(r, g, b, int(255*0.2)) for r in rgb for g in rgb for b in rgb] * 5
random.shuffle(colors)
size = ww * hh
rgb = colors[:size]
bg_img.putdata(rgb)

# set initial zoom level and size
zoom = 25.0

while True:
    random.shuffle(colors)
    rgb = colors[:size]
    fg_img.putdata(rgb)

    # add foreground image over the background image and update bg_img
    bg_img = Image.alpha_composite(bg_img, fg_img).convert('RGBA') # change to additive blending by removing convert to RGB

    # crop parameters to zoom into the center
    bg_img = bg_img.crop((zoom, zoom, ww - zoom, hh - zoom))
    bg_img = bg_img.resize((ww, hh), resample=Image.LANCZOS)

    # convert image to Tkinter PhotoImage
    tkimg = ImageTk.PhotoImage(bg_img)

    # display image on canvas
    canvas.create_image((cx, cy), image=tkimg)
    canvas.update()