How to Slow Down Your Turtle Animation in Python: Replacing `while True:` with `screen.ontimer()`?

How to Control the Speed of Turtle Animation in Python

In Python's Turtle library, the speed of animation is often perceived to be too fast. This article addresses the issue, providing a revised code snippet that adjusts the animation speed to a more manageable pace.

The provided code uses the tracer() method to turn off automatic screen updates, allowing manual control over the refresh rate. However, it employs the while True: loop for constant animation, which can lead to rapid execution.

To address this, the revised code replaces while True: with a screen.ontimer() event function. This function schedules a recurring event, with a configurable delay (in milliseconds), that refreshes the screen and advances the animation.

Here's the updated code:

<code class="python">import turtle
from turtle import Screen, Turtle

def rectangle(t):
    t.forward(50)
    t.left(90)
    t.backward(5)
    t.pendown()

    for _ in range(2):
        t.forward(10)
        t.right(90)
        t.forward(120)
        t.right(90)

    t.penup()

def windmill(t):
    for _ in range(4):
        t.penup()
        rectangle(t)
        t.goto(0, 0)

screen = Screen()
screen.tracer(0)

turtle = Turtle()
turtle.setheading(90)

def rotate():
    turtle.clear()
    windmill(turtle)
    screen.update()
    turtle.left(1)

    screen.ontimer(rotate, 40)  # adjust speed via second argument

rotate()

screen.mainloop()</code>

By adjusting the second argument (in milliseconds) to ontimer(), you can modify the speed of the animation. Lower values lead to slower animations, while higher values result in faster ones.

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