mainExplain.py

# Import the tkinter library and give it a shorter name "tk"
# Tkinter is used for creating graphical (GUI) applications in Python.
import tkinter as tk

# Import Image and ImageTk from the Pillow (PIL) library.
# Image lets us open and edit image files.
# ImageTk lets us display those images inside Tkinter.
from PIL import Image, ImageTk

# Import the random module to generate random numbers (for random spider positions).
import random


# Create the main application window (the root window).
root = tk.Tk()

# Make the window take up the entire screen (full screen mode).
root.attributes('-fullscreen', True)

# Keep the window always on top of all other windows.
root.attributes('-topmost', True)

# Make all black areas in the window transparent.
# ⚠️ This only works on Windows — not macOS or Linux.
root.attributes('-transparentcolor', 'black')


# Get the width of the screen (in pixels).
w = root.winfo_screenwidth()

# Get the height of the screen (in pixels).
h = root.winfo_screenheight()


# Create a canvas — a blank area where we can draw shapes or display images.
# It covers the entire screen (width = w, height = h),
# has a black background, and no border highlight.
canvas = tk.Canvas(root, width=w, height=h, bg='black', highlightthickness=0)

# Add the canvas to the window so it becomes visible.
canvas.pack()


# Open the image file "spider.png" using Pillow.
img = Image.open("spider.png")

# Convert the opened image into a format Tkinter can display.
spider_img = ImageTk.PhotoImage(img)


# Define a function that adds a spider image at a random position on the screen.
def add_spider():
    # Pick a random x-coordinate between 0 and the screen width.
    x = random.randint(0, w)
    # Pick a random y-coordinate between 0 and the screen height.
    y = random.randint(0, h)
    
    # Place the spider image at the random (x, y) position on the canvas.
    canvas.create_image(x, y, image=spider_img)
    
    # Schedule this function to run again after 500 milliseconds (0.5 seconds).
    # This makes new spiders keep appearing over time.
    root.after(500, add_spider)


# Disable the close button (the “X”) so the user cannot close the window normally.
# lambda: None means “do nothing” when the close event is triggered.
root.protocol('WM_DELETE_WINDOW', lambda: None)


# Start the process of adding spiders repeatedly.
add_spider()

# Start Tkinter’s main event loop.
# This keeps the window open and waits for events (like time delays or user actions).
root.mainloop()