Run after delta time

[jason990420]

import PySimpleGUI as sg

width, height = size = 480, 480

layout = [
    [sg.Graph(size, (0, 0), size, background_color='blue', key='GRAPH')],
    [sg.Slider(range=(1, 20), default_value=4, orientation='h', expand_x=True, enable_events=True, key='SLIDER')],
]
window = sg.Window('Title', layout, finalize=True)
graph:sg.Graph = window['GRAPH']
d, step, figure = 0, 4, None

def rotate():
    global d, figure, step
    if figure:
        graph.delete_figure(figure)
    points = [(d, height-1), (width-1, height-1-d), (width-1-d, 0), (0, d)]
    figure = graph.draw_polygon(points, fill_color='green')
    d = (d+step) % width
    window.TKroot.after(20, rotate)

rotate()

while True:

    event, values = window.read()

    if event == sg.WIN_CLOSED or event == 'Exit':
        break
    elif event == 'SLIDER':
        step = values[event]

window.close()