import pygame
from math import pi

pygame.init()
screen = pygame.display.set_mode([1000,1000])
clock = pygame.time.Clock()
done = False

while not done:
    clock.tick(10)
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            done = True
    screen.fill((0,0,0))

    # draw first arc just past pi/2 to make sure arc is not cut off by rectangle bounds
    pygame.draw.arc(screen, (255,255,255),[100,100,800,800], 9 * pi / 16, 1)

    # normal, easy, simple, arc does not touch vertical red line as expected
    pygame.draw.arc(screen, (255,255,255),[200,200,600,600], 2 * pi, 1)

    # shorter arc because in my actual code it seems that smaller arcs have larger gaps
    # but I can't seem to tell here besides it doesn't connect either
    pygame.draw.arc(screen, (255,255,255),[300,300,400,400], 4 * pi / 16, 1)

    # Horizontal and vertical lines for comparison
    pygame.draw.line(screen, (255,0,0), [500,500], [500,0])
    pygame.draw.line(screen, (255,0,0), [500,500], [900,500])

    pygame.display.flip()

pygame.quit()