import time
import math
import turtle
def line(startx,starty, endx,endy):
    fullx = endx-startx
    fully = endy-starty
    distance = math.sqrt(fully**2+fullx**2)
    if distance < 6:
        turtle.penup()
        turtle.goto(startx,starty)
        turtle.pendown()
        turtle.goto(endx,endy)
        return
    quarterx = fullx/4
    quartery = fully/4
    Ax = startx+quarterx
    Ay = starty+quartery
    Mx = startx+quarterx*2
    My = starty+quartery*2
    Fx = endx-quarterx
    Fy = endy-quartery
    Bx = Ax-quartery
    By = Ay+quarterx
    Cx = Mx-quartery
    Cy = My+quarterx
    Dx = Mx+quartery
    Dy = My-quarterx
    Ex = Fx+quartery
    Ey = Fy-quarterx
    line(startx,starty, Ax,Ay)
    line(Ax,Ay, Bx,By)
    line(Bx,By, Cx,Cy)
    line(Cx,Cy, Dx,Dy)
    line(Dx,Dy, Ex,Ey)
    line(Ex,Ey, Fx,Fy)
    line(Fx,Fy, endx,endy)

while True:
    turtle.ht()
    turtle.speed(0)
    turtle.pencolor("aqua")
    turtle.bgcolor("black")
    line(-600,0,600,0)
    time.sleep(10)
    turtle.reset()