# Tk_canvas_swap_polygons.py

# Tk_canvas_swap_polygons.py

from tkinter import *
from math import *
from time import *

root = Tk()

canvas = Canvas(root, width=500, height=500)
canvas.pack()

nine_pointed_star = []
for xy in range(0, 18, 2):
    nine_pointed_star.append(250+240*sin(xy*pi/9))
    nine_pointed_star.append(250-240*cos(xy*pi/9))
    nine_pointed_star.append(250+90*sin((xy+1)*pi/9))
    nine_pointed_star.append(250-90*cos((xy+1)*pi/9))
canvas.create_polygon(nine_pointed_star, fill='purple', tags='star')

star = []
for xy in range(0, 10, 2):
    star.append(250+240*sin(xy*pi/5))
    star.append(250-240*cos(xy*pi/5))
    star.append(250+90*sin((xy+1)*pi/5))
    star.append(250-90*cos((xy+1)*pi/5))

# swap stars with canvas configure when clicked
def swap_stars(e):
    if canvas.itemcget('star', 'fill') == 'purple':
        canvas.itemconfig('star', fill='yellow')
        canvas.coords('star', star)
        canvas.update()
        sleep(1)
        canvas.itemconfig('star', fill='purple')
        canvas.coords('star', nine_pointed_star)
        canvas.update()

canvas.tag_bind('star', '<Button-1>', swap_stars)

root.mainloop()