Tie circle radius to window size in Python Turtle

Question

In Python turtle, when drawing objects on the screen, if there was a way to have a circle's radius connected to the window width or height, so that it can be resized by altering the window size?

Answer 1

Yes, it is possible.

You will need to create an event that the turtle will listen to: In the following example, if you click on the turtle, a circle of half the width of the canvas will be drawn.
If you resize the canvas, and click on the turtle again, a new circle of half the new width will be redrawn.

import turtle


def start(dummy_a, dummy_b):
    t.reset()
    y, x = screen.window_height(), screen.window_width()
    t.home()
    t.circle(x/4)


if __name__ == '__main__':

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

    t.onclick(start, add=True)
    screen.listen()
    turtle.done()