import tkinter as tk
import random

def hvezdicka(canvas):
    x = random.randint(0, 800)
    y = random.randint(0, 600)
    size = random.randint(2, 4)
    canvas.create_rectangle(x, y, x + size, y + size, fill='yellow', outline='yellow')

def main():
    root = tk.Tk()
    root.title("Hvězdná obloha")
    canvas = tk.Canvas(root, width=800, height=600, bg='navy')
    canvas.pack()

    for _ in range(1000):
        hvezdicka(canvas)

    root.mainloop()

if __name__ == "__main__":
    main()