"""

"""
import tkinter as tk

root = tk.Tk()

k=30
W=22*k
H=4*k
sh0y=20
sh0x=H/2

def lineAB(a,b,shx, sh0y, k):
    canvas.create_line(a[0]*k+shx*4*k+sh0y,sh0x-a[1]*k,
                       b[0]*k+shx*4*k+sh0y, sh0x-b[1]*k,
                       width=3, capstyle=tk.ROUND)
def arcAB(a,b,shx, sh0y, k):
    R = ((b[0] - a[0]) / 2)*k
    canvas.create_arc(a[0]*k+shx*4*k+sh0y, sh0x-R,
                      b[0]*k+shx*4*k+sh0y, sh0x+R,
                      start=180, extent=-180, style=tk.ARC,
                       width=3)

canvas = tk.Canvas(root, width=W, height=H,bg='white')
canvas.pack()

# Horizontal line
i=1
while sh0x+i*k < H:
    canvas.create_line(0,sh0x+i*k, W, sh0x+i*k, fill='cyan')
    canvas.create_line(0,sh0x-i*k, W, sh0x-i*k, fill='cyan')
    i += 1

# Vertical line
i=1
while sh0y+i*k < W:
    canvas.create_line(sh0y+i*k,0, sh0y+i*k, W, fill='cyan')
    i += 1

canvas.create_line(0,sh0x,  W, sh0x, fill='gray', arrow=tk.LAST)#0x
canvas.create_line(sh0y,H,  sh0y, 0, fill='gray', arrow=tk.LAST)#0y




xy = [[0,-1], [1,0], [3,0], [3,-1], [4,-1]]
for i in range(5):
    lineAB(xy[0], xy[1], i, sh0y, k)
    arcAB(xy[1], xy[2], i, sh0y, k)
    lineAB(xy[2], xy[3], i, sh0y, k)
    lineAB(xy[3], xy[4], i, sh0y, k)




root.mainloop()