# Tk_polygon_redraw.py

# Tk_polygon_redraw.py

# change to tkinter for python3
from Tkinter import *
# from PIL import Image, ImageDraw
# import Image, ImageTk

list_of_points=[]
poly = None

# Function to get the co-ordianates of  mouse clicked position
def draw_polygons(event):
    mouse_xy = (event.x, event.y)
    func_Draw_polygons(mouse_xy)

# Function to draw polygon
def func_Draw_polygons(mouse_xy):
    global poly, list_of_points
    center_x, center_y = mouse_xy
    canvas.delete(ALL)

    list_of_points.append((center_x, center_y))

    for pt in list_of_points:
        x, y =  pt
        # draw dot over position which is clicked
        x1, y1 = (x - 1), (y - 1)
        x2, y2 = (x + 1), (y + 1)
        canvas.create_oval(x1, y1, x2, y2, fill='green', outline='green', width=5)

    # add clicked positions to list

    number_of_points=len(list_of_points)
    # Draw polygon
    if number_of_points > 2:
        poly=canvas.create_polygon(list_of_points, fill='', outline='green', width=2)
    elif number_of_points == 2 :
        print('line')
        canvas.create_line(list_of_points)
    else:
        print('dot')

    print(list_of_points)
    print
    print
#

root = Tk()
canvas = Canvas(root,height=600,width=600)
canvas.pack()
# bind function to canvas to generate event
canvas.bind("<Button 1>", draw_polygons)
root.mainloop()