# tk_scroll_by_brightness.py

# tk_scroll_by_brightness.py

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

def brightness(rgb):
    r, g, b = [x / 255.0 for x in rgb]
    return 0.299 * r + 0.587 * g + 0.114 * b

steps = 10
def generate_colors_sorted_by_brightness():
    colors = []
    for r in range(0, 256, steps):
        for g in range(0, 256, steps):
            for b in range(0, 256, steps):
                colors.append((r, g, b))
    colors.sort(key=brightness)
    return colors

root = tk.Tk()
root.title("Color Loop - Sorted by Brightness")
root.geometry("500x500")

canvas = tk.Canvas(root, width=500, height=500, highlightthickness=0, bg='gray')
canvas.pack()

canvas_image = Image.new('RGB', (500, 500), color='gray')
draw = ImageDraw.Draw(canvas_image)

colors = generate_colors_sorted_by_brightness()
color_index = 0
len_colors = len(colors)

while True:
    color = colors[color_index]
    draw.rectangle([(0, 0), (500, 3)], fill=color)

    photo_image = ImageTk.PhotoImage(canvas_image)
    canvas.create_image(0, 0, image=photo_image, anchor='nw')

    color_index = (color_index + 1) % len_colors
    canvas.update()

    crop_image = canvas_image.crop((0, 0, 500, 500))
    canvas_image.paste(crop_image, (0, 4))