#!/usr/bin/env python3
#
# Fill a circle with 0 and 1's
# The circle is made of half as many lines as it is made of columns.
# This way, it usually appears round (with most terminal fonts at least).
# Accept the circle's width-radius as argument. See the default radius r, below.

r = 15
from sys import argv
if len(argv) > 1:
    r = int(argv[1])

import random

def rand01generator():
    while True:
        r = random.randrange(2 ** 32)
        for i in range(32):
            yield 1 & r >> i

class Circle:
    def __init__(self, r):
        self.r = r
    def __contains__(self, point):
        x, y = point
        return x ** 2 + y ** 2 <= self.r ** 2

c = Circle(r)

g = rand01generator()


text = []

for y in range(r):
    line = []
    for x in range(2*r):
        if (x + 0.5 - r, 2 * y + 1 - r) in c:
            line.append(str(next(g)))
        else:
            if x <= r:
                line.append(" ")
    text.append("".join(line))

print("\n".join(text))

example_output = """
          0101010011
      011110000011100101
    1110111010111111011011
  00000000101011000010100100
 1101011100101001001110110100
 1101110101110101100101111111
010101001110010111001011111101
101100011100101101110011000111
110111000110000010000010001101
 0010100110001000110010010000
 0100110101000100011000100111
  11100100010011000000001000
    1001010101101101010101
      011111010101101011
          1011110000
"""