Write a program using Tkinter which draws a caricature of yourself on a canvas object. The GUI should have two buttons, one which draws the picture and one which erases it. You can use the supplied Python program as a starting point, and just replace the code in the draw() method with your own code. Supplied Code: # A simple example to demonstrate basic usage of tkinter. # To complete question, you only need to # modify the draw() method; you don't need to make any # other changes anywhere else in the code. import tkinter as tk # Define a class for our application, # which inherits from tk.Frame. class MyApplication(tk.Frame): ########################################## def __init__(self, master): super().__init__(master) self.master = master self.pack() # self.handle_list is to remember handles # to some of the things we draw, # so that we can erase them later. self.handle_list = [] # Create all the widgets we want in # our window at the beginning. self.create_widgets() ########################################## def create_widgets(self): # Create the widgets we want our window to have at startup. # First, a Canvas widget that we can draw on. # It will be 800 pixels wide, and 600 pixels tall. self.canvas = tk.Canvas(self.master, width=800, height=600, background="white") # This 'pack' method packs it into the top-level window. self.canvas.pack() # Create a button with label "Draw", which calls the member # function self.draw() below when it's activated. self.draw_button = tk.Button(text="Draw", command=self.draw) # Pack the button into the window. self.draw_button.pack() # Create another button, with label "Clear" which calls the # member function self.clear() when it's activated. self.clear_button = tk.Button(text="Clear", command=self.clear) self.clear_button.pack() def draw(self): ############################################# # Add your code to this method. Be sure to # # store the 'handles' in the same way as # # the sample code, so that the objects # # will be removed when the 'clear button' # # is clicked. # # You can delete all of the existing code # # that's in this method right now - it is # # here just as an example of drawing some # # things and storing the handles. # ############################################# # The canvas methods .create_XXXXX actually return # an internal name (integer) corresponding to each # object we create, called a 'handle. # We will store those handles so that when the 'clear button' # is clicked, we can ask the canvas to remove them. # Create/draw an oval on the canvas. # The first four numbers describe a bounding # box for the oval: (250, 150) is one corner, # and (550, 450) is another. h = self.canvas.create_oval(250,150,550,450,fill="yellow") self.handle_list.append(h) # This would create/draw a rectangle on the canvas, # if we wanted one. # self.canvas.create_rectangle(250, 150, 550, 450) # Draw a bunch of lines. for n in range(0,300,20): h = self.canvas.create_line(400,n,400+n,300) self.handle_list.append(h) h = self.canvas.create_line(400+n,300,400,600-n) self.handle_list.append(h) h = self.canvas.create_line(400,600-n,400-n,300) self.handle_list.append(h) h = self.canvas.create_line(400-n,300,400,n) self.handle_list.append(h) ############################################## def clear(self): # To clear the things we drew in the 'draw' # function, we just ask the canvas to delete them, # one at a time, by their handles. # You should not need to modify anythingin this method. while len(self.handle_list)>0: h = self.handle_list.pop() self.canvas.delete(h) ######################################## # Do not change anything below here! # ######################################## # Instantiate the Tk class. # This should only ever be done once in a program. # Think of it as 'firing up' the library, getting it ready to do stuff. root = tk.Tk() # Create an instance of the MyApplication class we defined above. app = MyApplication(master=root) # Pass flow control over to the Tkinter library, so it can do things # like wait for keyboard and mouse events, redraw the window when needed,... # One of the things it will do is watch for buttons we created and invoke # the 'callback functions' we gave them. It will run indefinitely, # until the operating system sends it a 'quit' command (e.g., # if we close the window). app.mainloop()
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Write a program using Tkinter which draws a caricature of yourself on a canvas object. The GUI should have two buttons, one which draws the picture and one which erases it. You can use the supplied Python program as a starting point, and just replace the code in the draw() method with your own code.
Supplied Code:
# A simple example to demonstrate basic usage of tkinter.
# To complete question, you only need to
# modify the draw() method; you don't need to make any
# other changes anywhere else in the code.
import tkinter as tk
# Define a class for our application,
# which inherits from tk.Frame.
class MyApplication(tk.Frame):
##########################################
def __init__(self, master):
super().__init__(master)
self.master = master
self.pack()
# self.handle_list is to remember handles
# to some of the things we draw,
# so that we can erase them later.
self.handle_list = []
# Create all the widgets we want in
# our window at the beginning.
self.create_widgets()
##########################################
def create_widgets(self):
# Create the widgets we want our window to have at startup.
# First, a Canvas widget that we can draw on.
# It will be 800 pixels wide, and 600 pixels tall.
self.canvas = tk.Canvas(self.master, width=800, height=600, background="white")
# This 'pack' method packs it into the top-level window.
self.canvas.pack()
# Create a button with label "Draw", which calls the member
# function self.draw() below when it's activated.
self.draw_button = tk.Button(text="Draw", command=self.draw)
# Pack the button into the window.
self.draw_button.pack()
# Create another button, with label "Clear" which calls the
# member function self.clear() when it's activated.
self.clear_button = tk.Button(text="Clear", command=self.clear)
self.clear_button.pack()
def draw(self):
#############################################
# Add your code to this method. Be sure to #
# store the 'handles' in the same way as #
# the sample code, so that the objects #
# will be removed when the 'clear button' #
# is clicked. #
# You can delete all of the existing code #
# that's in this method right now - it is #
# here just as an example of drawing some #
# things and storing the handles. #
#############################################
# The canvas methods .create_XXXXX actually return
# an internal name (integer) corresponding to each
# object we create, called a 'handle.
# We will store those handles so that when the 'clear button'
# is clicked, we can ask the canvas to remove them.
# Create/draw an oval on the canvas.
# The first four numbers describe a bounding
# box for the oval: (250, 150) is one corner,
# and (550, 450) is another.
h = self.canvas.create_oval(250,150,550,450,fill="yellow")
self.handle_list.append(h)
# This would create/draw a rectangle on the canvas,
# if we wanted one.
# self.canvas.create_rectangle(250, 150, 550, 450)
# Draw a bunch of lines.
for n in range(0,300,20):
h = self.canvas.create_line(400,n,400+n,300)
self.handle_list.append(h)
h = self.canvas.create_line(400+n,300,400,600-n)
self.handle_list.append(h)
h = self.canvas.create_line(400,600-n,400-n,300)
self.handle_list.append(h)
h = self.canvas.create_line(400-n,300,400,n)
self.handle_list.append(h)
##############################################
def clear(self):
# To clear the things we drew in the 'draw'
# function, we just ask the canvas to delete them,
# one at a time, by their handles.
# You should not need to modify anythingin this method.
while len(self.handle_list)>0:
h = self.handle_list.pop()
self.canvas.delete(h)
########################################
# Do not change anything below here! #
########################################
# Instantiate the Tk class.
# This should only ever be done once in a program.
# Think of it as 'firing up' the library, getting it ready to do stuff.
root = tk.Tk()
# Create an instance of the MyApplication class we defined above.
app = MyApplication(master=root)
# Pass flow control over to the Tkinter library, so it can do things
# like wait for keyboard and mouse events, redraw the window when needed,...
# One of the things it will do is watch for buttons we created and invoke
# the 'callback functions' we gave them. It will run indefinitely,
# until the
# if we close the window).
app.mainloop()
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