Answer
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Work Step by Step
# 9.16 (Display a running fan) Write a program that displays a fan running, as shown in
# Figure 9.29a.
from tkinter import * # Import tkinter
width = 200
height = 200
radius = 80
class MainGUI:
def __init__(self):
window = Tk() # Create a window
window.title("Fan") # Set a title
self.canvas = Canvas(window, bg="white", width=width, height=height)
self.canvas.pack()
self.startingAngle = 0
while True:
self.startingAngle += 5
self.displayFan(self.startingAngle)
self.canvas.after(100) # Sleep for 100 milliseconds
self.canvas.update()
window.mainloop() # Create an event loop
def displayFan(self, startingAngle):
self.canvas.delete("fan")
self.canvas.create_arc(width / 2 - radius, height / 2 - radius, width / 2 + radius, height / 2 + radius,
start=self.startingAngle + 0, extent=30, fill="red", tags="fan")
self.canvas.create_arc(width / 2 - radius, height / 2 - radius, width / 2 + radius, height / 2 + radius,
start=self.startingAngle + 90, extent=30, fill="red", tags="fan")
self.canvas.create_arc(width / 2 - radius, height / 2 - radius, width / 2 + radius, height / 2 + radius,
start=self.startingAngle + 180, extent=30, fill="red", tags="fan")
self.canvas.create_arc(width / 2 - radius, height / 2 - radius, width / 2 + radius, height / 2 + radius,
start=self.startingAngle + 270, extent=30, fill="red", tags="fan")
MainGUI()
