# -*- coding: utf-8 -*-
import tkinter as tk
import tkinter.ttk as ttk
#from tkinter import font
#from tkinter import filedialog
root = tk.Tk()
root.title("tk35.py")
#####################################
ca = tk.Canvas(root, bg = 'lightgreen', 
        relief = 'raised', bd = 5, width = 500, height = 500)
ca.pack()
line = ca.create_line(10,10,100,100, 100, 50, 
                      fill = 'blue', width = 5, 
                      arrow = tk.BOTH, arrowshape = (8,10,8))

line1 = ca.create_line(20,20, 120, 20, fill = 'black', dash = (5,))
line2 = ca.create_line(30, 30, 130, 30, fill = 'red', 
                       dash = (5, 1, 1, 1), width = 5)
line3 = ca.create_line(40, 40, 140, 40, fill = 'white', 
                       dash = (7, 2, 2), width = 5)


x0 = 250
y0 = 250
length = 2
for i in range(1, 61, 4):
    x1 = x0+length*i
    ca.create_line(x0, y0, x1, y0)
    x0 = x1
    y1 = y0-length*(i+1)
    ca.create_line(x0, y0, x1, y1)
    x1 = x0 - length*(i+2)
    y0 = y1
    ca.create_line(x0, y0, x1, y1)
    x0 = x1
    y1 = y0 + length*(i+3)
    ca.create_line(x0, y0, x1, y1)
    x0 = x1
    y0 = y1
    

#####################################
root.mainloop()