Python Turtle Graphics Drawing - Sierpiński Triangle

 Python Turtle Graphics Drawing - Sierpiński Triangle

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Source code:

import turtle as t

import colorsys as cs

from math import sqrt

t.setup(640, 640)

t.bgcolor('black')

t.tracer(10)

t.pensize(2)

R = 500

def tri(r,l):

    if l == 0:

        p=t.pos()

        d = sqrt(p[0]**2+p[1]**2)

        t.color(cs.hls_to_rgb(d/300,0.5,1))

        t.down()

        for i in range(3):

            t.fd(r)

            t.lt(120)

        t.up()

    else:

        t.fd(r/2)

        tri(r/2,l-1)

        t.lt(120)

        tri(r/2,l-1)

        t.fd(r/2)

        t.rt(120)

        tri(r/2,l-1)

        t.rt(120)

        t.fd(r/2)

        t.lt(120)

t.hideturtle()

y = sqrt(R**2-(R/2)**2)

t.up()

t.goto(-R/2,-y/2)

tri(R,7)

t.done()