#-*- coding:utf-8 -*-
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#                                             #
#         Program written by NouruX           #
#               Licence : GPL                 #
#                                             #
###############################################

###############################################
#This program that



###############################################
#Importation of modules
from Tkinter import *


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#Definition of functions
def change():
    global flag
    if flag%2 == 0 :
        myCan.coords(cercle00, 40, 180, 70, 210)
        myCan.coords(cercle01, 330, 70, 360, 100)
        myCan.coords(cercle10, 40, 70, 70, 100)
        myCan.coords(cercle11, 330, 180, 360, 210)
    elif flag%2 != 0 :
        myCan.coords(cercle00, 40, 70, 70, 100)
        myCan.coords(cercle01, 330, 180, 360, 210)
        myCan.coords(cercle10, 40, 180, 70, 210)
        myCan.coords(cercle11, 330, 70, 360, 100)
    flag+= 1

def passage():
    i, x, y = 0, 85, 100
    while i < 8:
        myCan.create_rectangle(x, y, x+20, y+80, fill='yellow')
        x = x+30
        i+= 1
###############################################
#Main

#Setting a flag
flag = 0
#Creating a main window
myFen = Tk()
#Creating a Canvas
myCan = Canvas(myFen, width=400, height=300, bg='white')
myCan.pack()
#Create the road
myCan.create_rectangle(80, 10, 320, 290, fill='dark gray')
#Create cercles
cercle00 = myCan.create_oval(40, 70, 70, 100, width=2, outline='green', fill='green')
cercle01 = myCan.create_oval(330, 180, 360, 210, width=2, outline='green', fill='green')
cercle10 = myCan.create_oval(40, 180, 70, 210, width=2, outline='red', fill='red')
cercle11 = myCan.create_oval(330, 70, 360, 100, width=2, outline='red', fill='red')

myBtn0 = Button(myFen, text='Change', command=change)
myBtn0.pack(side=RIGHT)


passage()
myFen.mainloop()