Twisted Square Animation - Python Turtle Graphics

 Twisted Square Animation - Python Turtle Graphics

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Source code:

from turtle import *

from math import atan2,degrees

import colorsys as cs

setup(500,500)

bgcolor('black')

R = 150

tur = (Turtle(),Turtle(),Turtle(),Turtle())

tracer(0,0)

M = 0.001

color('white')

cols=['red','green','orange','cyan']

up()

dM = 0.0005

hh = 0

hideturtle()

while True:

    h = hh

    clear()

    for i in range(4):

        tur[i].hideturtle()

        tur[i].up()

        tur[i].color(cols[i])

        tur[i].clear()

    tur[0].goto(-R,R)

    tur[1].goto(R,R)

    tur[2].goto(R,-R)

    tur[3].goto(-R,-R)

    tur[0].seth(0)

    tur[1].seth(-90)

    tur[2].seth(180)

    tur[3].seth(90)

    r=R*2

    for i in range(20):

        color(cs.hsv_to_rgb(h,1,1))

        goto(tur[0].pos())

        down()

        goto(tur[1].pos())

        goto(tur[2].pos())

        goto(tur[3].pos())

        goto(tur[0].pos())

        up()

        a = degrees(atan2(M*r,r-M*r))

        for j in range(4):

            tur[j].fd(M*r)

            tur[j].rt(a)

        r=r-M*r

        h = h+0.025

    update()

    hh = hh+0.0025

    M=M+dM

    if M>=0.2 or M<=-0.1:

        dM=-dM

        dM=dM*1.25

done()