import tkinter as tk

#-- constants:
width = 100
heigth = 100
max_iterations = 30
groot = 1000
upperleft = complex(-2, 1.25)
downright = complex(1, -1.25)

#-- extra variables and functions:

xfactor = (downright.real - upperleft.real) / width
yfactor = (downright.imag - upperleft.imag) / heigth

def world(i, j):
    """screen coordinates are transformed to world coordinates (couple of ints is transformed in one complex number)"""
    return complex(i * xfactor + upperleft.real, j * yfactor + upperleft.imag)

def screen(z):
    """world coordinates are transformed to screen coordinates (complex number is transformed in couple of ints)"""
    return ( int((z.real-upperleft.real)/xfactor), int((z.imag-upperleft.imag)/yfactor) ) 

#-- main program:
   
root = tk.Tk()

canvas = tk.Canvas(root, width=width, height=heigth)
canvas.pack()

#-- change this if you want another effect:


canvas.create_line(0,0,width/2,heigth/2)

canvas.create_rectangle(20, 30, 25, 35, fill="black", outline="")


#-- stop here; don't change what's next

usingIDLE = 0
if not usingIDLE:
    root.mainloop()