How to change the color of a Tkinter rectangle on clicking?

The Canvas widget is one of the most versatile widgets in the Tkinter Library. It is used for creating shapes of different types and sizes, animating objects, visualizing graphics, and many more. To change the property of a particular item in Tkinter, we can use itemconfig(**options) method. It takes options such as background color, outline color, and other useful properties of the items defined in a canvas.

Example

In this example, we will create a rectangle such that the color inside the rectangle would change after clicking a Button.

# Import the required libraries
from tkinter import *
from tkinter import ttk

# Create an instance of Tkinter Frame
win = Tk()

# Set the geometry
win.geometry("700x300")

# Define a function to change the state of the Widget
def change_color():
   canvas.itemconfig(rectangle, fill='green')

# Define a Canvas Widget
canvas = Canvas(win, width=500, height=240)
canvas.pack()

# Create a rectangle in Canvas
rectangle = canvas.create_rectangle(100, 100, 400, 400, fill='blue')

# Create a Button to Disable the Combobox Widget
ttk.Button(win, text="Change Color", command=change_color).pack()
win.mainloop()

Output

When you run the above code, it will display a window with a blue-colored rectangle at the center.

Now, click the "Change Color" button. It will change the color of the rectangle to green.