Answer
code
Work Step by Step
# 9.24 (Display circles) Write a program that displays a new larger circle with a left
# mouse click and removes the largest circle with a right mouse click, as shown in
# Figure 9.35.
from tkinter import * # Import tkinter
width = 200
height = 200
class MainGUI:
def __init__(self):
window = Tk() # Create a window
window.title("Dynamic Circles") # Set title
self.radius = 20
self.tagNumber = 0
self.canvas = Canvas(window, bg="white", width=width, height=height)
self.canvas.create_oval(width / 2 - self.radius, height / 2 - self.radius,
width / 2 + self.radius, height / 2 + self.radius, tags=str(self.tagNumber))
self.canvas.pack()
self.canvas.bind("", self.addACircle)
self.canvas.bind("", self.removeACircle)
window.mainloop() # Create an event loop
def addACircle(self, event):
self.tagNumber += 1
self.radius += 5
self.canvas.create_oval(width / 2 - self.radius, height / 2 - self.radius,
width / 2 + self.radius, height / 2 + self.radius, tags=str(self.tagNumber))
def removeACircle(self, event):
self.canvas.delete(str(self.tagNumber))
self.radius -= 5
self.tagNumber -= 1
MainGUI()
