https://www.reddit.com/r/vexillologycirclejerk/comments/84dpgu/ultra_sweden_sweden_but_we_must_go_deeper/dvov878/ https://www.reddit.com/r/eyehurtingflags/comments/7w4ing/my_improved_swedish_flag/dtyiuqr/

supersweden.py

#!/usr/bin/env python3

# for i in {1..10}; do echo $i; python3 supersweden.py $i; done

import sys

import cairo


level = int(sys.argv[1])
size = (1600, 1000)
dx = (5, 2, 9)
dy = (4, 2, 4)
blue = (0, 106, 168)
yellow = (254, 205, 0)


surface = cairo.ImageSurface(cairo.FORMAT_RGB24, *size)
g = cairo.Context(surface)

g.rectangle(0, 0, *size)
g.set_source_rgb(*(c/255 for c in blue))
g.fill()

g.set_source_rgb(*(c/255 for c in yellow))

def draw(x, y, zx, zy, level):
  if level == 0:
    return
  dx1, dx2, dx3 = [zx*d/sum(dx) for d in dx]
  dy1, dy2, dy3 = [zy*d/sum(dy) for d in dy]
  ddx = dx1+dx2
  ddy = dy1+dy2

  g.rectangle(x+dx1, y, dx2, zy)
  g.rectangle(x, y+dy1, zx, dy2)
  g.fill()

  draw(x    , y    , dx1, dy1, level-1)
  draw(x+ddx, y    , dx3, dy1, level-1)
  draw(x    , y+ddy, dx1, dy3, level-1)
  draw(x+ddx, y+ddy, dx3, dy3, level-1)

draw(0, 0, *size, level)
surface.write_to_png(f's{level}.png')