Circle in bitmap graphics

circle.py

import math

from PIL import Image


def circle(r=20, fill=True):
    im = Image.new("RGB", (r * 2 + 1, r * 2 + 1), (255, 255, 255))
    for a in range(360):
        x = int(r + r * math.cos(math.radians(a)))
        y = int(r + r * math.sin(math.radians(a)))
        im.putpixel((x, y), (0, 0, 0))

    if fill:
        for x in range(r * 2):
            for y in range(r * 2):
                if round((x - r) ** 2 + (y - r) ** 2) <= round(r ** 2):
                    im.putpixel((x, y), (0, 0, 0))
    im.save("circle" + str(r) + "_" + ("fill" if fill else "nofill") + ".png")

# circle(100, fill=False)  # Obr. 1
# circle(100, fill=True)  # Obr. 2