How to clear Tkinter Canvas?

Tkinter provides a way to add a canvas in a window, and when we create a canvas, it wraps up some storage inside the memory. While creating a canvas in Tkinter, it will effectively eat some memory which needs to be cleared or deleted.

In order to clear a canvas, we can use the delete() method. By specifying "all", we can delete and clear all the canvas objects that are present in a Tkinter frame.

Syntax

canvas.delete("all")

Where canvas is your canvas object and "all" removes all items from the canvas.

Example

Let's create a canvas with an arc and then clear it using the delete() method ?

# Import the tkinter library
from tkinter import *

# Create an instance of tkinter frame
win = Tk()

# Set the geometry
win.geometry("650x250")

# Creating a canvas
myCanvas = Canvas(win, bg="white", height=200, width=200)
coordinates = 10, 10, 200, 200
arc = myCanvas.create_arc(coordinates, start=0, extent=320, fill="red")
myCanvas.pack()

# Print canvas items before clearing
print("Canvas items before clearing:", myCanvas.find_all())

# Clearing the canvas
myCanvas.delete('all')

# Print canvas items after clearing
print("Canvas items after clearing:", myCanvas.find_all())

win.mainloop()

The output of the above code is ?

Canvas items before clearing: (1,)
Canvas items after clearing: ()

Clearing Specific Items

You can also clear specific items by passing their item IDs instead of "all" ?

from tkinter import *

win = Tk()
win.geometry("400x300")

canvas = Canvas(win, bg="lightgray", height=200, width=300)

# Create multiple items
circle = canvas.create_oval(50, 50, 150, 150, fill="blue")
rectangle = canvas.create_rectangle(200, 50, 280, 120, fill="green")
line = canvas.create_line(10, 180, 290, 180, width=3)

canvas.pack()

# Delete only the circle
canvas.delete(circle)

print("Remaining items:", canvas.find_all())

win.mainloop()

The output shows the remaining items after deleting the circle ?

Remaining items: (2, 3)

Common Use Cases

• Animation: Clear canvas before drawing the next frame
• Drawing apps: Implement "Clear All" functionality
• Games: Reset the game board
• Data visualization: Update charts and graphs

Comparison

Conclusion

Use canvas.delete("all") to clear all items from a Tkinter canvas. For selective deletion, use the specific item ID returned when creating canvas objects.