turtle.ontimer() function in Python

20 Sep turtle.ontimer() function in Python

Posted at 11:00h in Python Turtle by Studyopedia Editorial Staff 0 Comments

The turtle.ontimer() function arranges for a function to be called after a specified delay (in milliseconds). Useful for creating animations or timed events.

Syntax: turtle.ontimer(fun, t=0)
Parameters: fun – a function with no arguments; t – a number >= 0 (the delay in milliseconds).

Let us see an example to implement the turtle.ontimer() function in Python:

Demo35.py

# turtle.ontimer() function in Python
# Code by Studyopedia

import turtle

window = turtle.Screen()
t = turtle.Turtle()

def blink():
    if t.isvisible():
        t.hideturtle()
    else:
        t.showturtle()
    window.ontimer(blink, 500)  # Schedule next blink in 500ms

blink()  # Start blinking

window.mainloop()

The following is the output:

turtle.ontimer() function in Python

In the above code, we followed the below steps:

Import module: import turtle loads the turtle graphics library.
Create screen: window = turtle.Screen() opens the drawing window.
Create turtle: t = turtle.Turtle() creates the turtle you’ll control.
Define blink(): def blink(): toggles the turtle’s visibility and reschedules itself.
- Check visibility: t.isvisible() returns True if the turtle is currently shown.
- Toggle: t.hideturtle() hides it if visible; otherwise t.showturtle() shows it.
- Reschedule: window.ontimer(blink, 500) calls blink again after 500 milliseconds, creating a repeating blink.
Start blinking: blink() runs the function once to kick off the timer-based loop.
Run event loop: window.mainloop() keeps the window open and processes the timer callbacks.