from tkinter import *
from tkinter.messagebox import *
import time

class Eye() :            #<i> define a new class of objects</i>

       #<i> define the constructor for making new objects of this class </i>
    def __init__(self, x, y, colr) :
        self.size = 10          #<i>give an initial value to the size field</i>
        self.colour = colr      #<i>store the colr in the colour field </i>
        self.x = x            #<i>store the position in the x and y fields </i>
        self.y = x
          
    def move(self, stepX, stepY) :   #<i>define a move method that changes object on a canvas</i>
        self.x = self.x + stepX
        self.y = self.y + stepY

    def grow(self) :           #<i>define a grow method that makes the object bigger</i>
        self.size = self.size + 10

    def draw(self, canvas) :   #<i>define a draw method that draws the object on a canvas</i>
        wd = self.size
        ht = wd/2
        rad = self.size/4
        smallrad = rad/2
        canvas.create_oval(self.x-wd, self.y-ht, self.x+wd, self.y+ht, fill=self.colour)
        canvas.create_oval(self.x-rad, self.y-rad, self.x+rad, self.y+rad, fill="black")
    

 
    #<i>Elsewhere in program, create two objects and draw them:</i>

def main() :
    window = Tk()
    canvas = Canvas(window, width=450, height=300, bg = 'white')
    canvas.pack()

    left = Eye(10, 10, "green")
    right  = Eye(250, 100, "blue")
    left.draw(canvas)
    right.draw(canvas)
    canvas.update()
     
    showinfo("", "Ready to move them?")
    for i in range(20) :
        canvas.delete(ALL)
        left.move(2, 5)
        right.grow()
        left.draw(canvas)
        right.draw(canvas)
        canvas.update()
        time.sleep(0.2)
        

    showinfo("", "All done?")


main()