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rbricheno/pi_turtle.py

Created November 24, 2020 10:17
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pi_turtle.py
from turtle import *
DIGITS = 1000
def pi_digits(x):
"""Generate x digits of Pi.
Nicked from https://stackoverflow.com/a/54967370/9794932"""
k,a,b,a1,b1 = 2,4,1,12,4
while x > 0:
p,q,k = k * k, 2 * k + 1, k + 1
a,b,a1,b1 = a1, b1, p*a + q*a1, p*b + q*b1
d,d1 = a/b, a1/b1
while d == d1 and x > 0:
yield int(d)
x -= 1
a,a1 = 10*(a % b), 10*(a1 % b1)
d,d1 = a/b, a1/b1
digits = [str(n) for n in list(pi_digits(DIGITS))]
color('red')
just_turned = False
for digit in digits:
digit = int(digit)
if not just_turned:
left(digit * 36)
just_turned = True
else:
forward(digit * 5)
just_turned = False
done()
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