# tk_4_canvas_masks.py

# tk_4_canvas_masks.py

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

WW, HH = 640, 640
WW2, HH2 = WW*2, HH*2
LINE_SPACING = 2

root = tk.Tk()
canvas = tk.Canvas(root, width=WW-1, height=HH-1, bg='black')
canvas.pack()

img1 = Image.new("RGBA", (WW2, HH2), (255, 0, 0, 255))
img2 = Image.new("RGBA", (WW2, HH2), (0, 255, 0, 255))
img3 = Image.new("RGBA", (WW2, HH2), (0, 0, 255, 255))
img4 = Image.new("RGBA", (WW2, HH2), (255, 255, 0, 255))

tile_size = 32
tile = Image.new("L", (tile_size, tile_size), 255)
draw_tile = ImageDraw.Draw(tile)
for x in range(0, tile_size, LINE_SPACING):
    draw_tile.line((x, 0, x, tile_size), fill=0)
for y in range(0, tile_size, LINE_SPACING):
    draw_tile.line((0, y, tile_size, y), fill=0)

mask = Image.new("L", (WW2, HH2), 255)
for y in range(0, HH2+tile_size, tile_size):
    for x in range(0, WW2+tile_size, tile_size):
        mask.paste(tile, (x, y))

combined = Image.new("RGBA", (WW2, HH2))
combined.paste(img1, (0, 0), mask)
combined.paste(img2, (1, 0), mask)
combined.paste(img3, (0, 1), mask)
combined.paste(img4, (1, 1), mask)

crop_region = (64, 64, 128, 128)
cropped = combined.crop(crop_region)
resized = cropped.resize((WW, HH), resample=Image.NEAREST)

tk_img = ImageTk.PhotoImage(resized)
canvas.create_image(1, 1, image=tk_img, anchor='nw')

root.mainloop()