#####################

# Example of event-driven code, buggy version

import simplegui

size = 10

radius = 10

# Define event handlers.

def incr_button_handler():

"""Increment the size."""

global size

size += 1

label.set_text("Value: " + str(size))

def decr_button_handler():

"""Decrement the size."""

global size

if size > 0:

size -= 1

label.set_text("Value: " + str(size))

def change_circle_handler():

"""Change the circle radius."""

global radius

radius = size

radiuslabel.set_text('Radius: ' + str(radius))

def draw_handler(canvas):

"""Draw the circle."""

canvas.draw_circle((100, 100), radius, 5, "Red")

frame = simplegui.create_frame("Home", 200, 200)

label = frame.add_label("Value: " + str(size))

frame.add_button("Increase", incr_button_handler)

frame.add_button("Decrease", decr_button_handler)

radiuslabel = frame.add_label("Radius: " + str(radius))

frame.add_button("Change circle", change_circle_handler)

frame.set_draw_handler(draw_handler)

# Start the frame animation

frame.start()