from pygame.locals import *
import pygame, sys, random

BACK = (0,0,200)
ORTH = [(-1,0), (1,0), (0,-1), (0,1)]
PI = 3.141592

random.seed(9999)
def ri(n):
    return int(random.random() * n)

args = [int(v) for v in sys.argv[1:]]
W, H = args[:2]
shares = sorted(args[2:])
ratio = float(W*H) / sum(shares)
counts = [int(s*ratio) for s in shares]
for i in range(W*H - sum(counts)):
    counts[i] += 1

colors = [(2+ri(250), 2+ri(250), 2+ri(250)) for c in counts]
countries = range(len(counts))
random.shuffle(countries)

border = ( set((x,y) for x in (0,W-1) for y in range(H)) |
            set((x,y) for x in range(W) for y in (0,H-1)) )

screen = pygame.display.set_mode((W,H))
screen.fill(BACK)
pix = screen.set_at
def look(p):
    if 0 <= p[0] < W and 0 <= p[1] < H:
        return screen.get_at(p)
    else:
        return None

clock = pygame.time.Clock()

while True:
    dt = clock.tick(300)
    pygame.display.flip()

    if countries:
        country = countries.pop()
        color = colors[country]
        if not countries:
            color = (20,20,200)  # last fill color to be water
        count = counts[country]
        frontier = set()
        plotted = 0
        loc = border.pop()
        while plotted < count:
            pix(loc, color)
            if plotted % 50 == 0:
                pygame.display.flip()
            plotted += 1
            direc = [(loc[0]+dx, loc[1]+dy) for dx,dy in ORTH]
            for dloc in direc:
                if look(dloc) == BACK:
                    frontier.add(dloc)
            border |= frontier
            if frontier:
                loc = frontier.pop()
                border.discard(loc)
            else:
                print 'Country %s cover %u of %u' % (
                    shares[country], plotted, count)
                break
        if not countries:
            fn = 'mapper%u.png' % ri(1000)
            pygame.image.save(screen, fn)

    for event in pygame.event.get():
        if event.type == QUIT: sys.exit(0)
        if not hasattr(event, 'key'): continue
        if event.key == K_ESCAPE: sys.exit(0)

from pygame.locals import *
import pygame, sys, random

BACK = (0,0,200)
ORTH = [(-1,0), (1,0), (0,-1), (0,1)]
PI = 3.141592

random.seed(9999)
def ri(n):
    return int(random.random() * n)

args = [int(v) for v in sys.argv[1:]]
W, H = args[:2]
shares = sorted(args[2:])
ratio = float(W*H) / sum(shares)
counts = [int(s*ratio) for s in shares]
for i in range(W*H - sum(counts)):
    counts[i] += 1

colors = [(2+ri(250), 2+ri(250), 2+ri(250)) for c in counts]
countries = range(len(counts))
random.shuffle(countries)

border = ( set((x,y) for x in (0,W-1) for y in range(H)) |
            set((x,y) for x in range(W) for y in (0,H-1)) )

screen = pygame.display.set_mode((W,H))
screen.fill(BACK)
pix = screen.set_at
def look(p):
    if 0 <= p[0] < W and 0 <= p[1] < H:
        return screen.get_at(p)
    else:
        return None

clock = pygame.time.Clock()

while True:
    dt = clock.tick(300)
    pygame.display.flip()

    if countries:
        country = countries.pop()
        color = colors[country]
        if not countries:
            color = (20,20,200)  # last fill color to be water
        count = counts[country]
        frontier = set()
        plotted = 0
        loc = border.pop()
        while plotted < count:
            pix(loc, color)
            if plotted % 50 == 0:
                pygame.display.flip()
            plotted += 1
            direc = [(loc[0]+dx, loc[1]+dy) for dx,dy in ORTH]
            for dloc in direc:
                if look(dloc) == BACK:
                    frontier.add(dloc)
            border |= frontier
            if frontier:
                loc = frontier.pop()
                border.discard(loc)
            else:
                print 'Country %s cover %u of %u' % (
                    shares[country], plotted, count)
                break
        if not countries:
            fn = 'mapper%u.png' % ri(1000)
            pygame.image.save(screen, fn)

    for event in pygame.event.get():
        if event.type == QUIT: sys.exit(0)
        if not hasattr(event, 'key'): continue
        if event.key == K_ESCAPE: sys.exit(0)

This last example looks a little like East Europe?

This example looks a little like East Europe?

An example with more countries: 640 480 6 1 7 2 9 3 4 5 6 1 9 8 7 44 3 1 9 4 5 6 7 2 3 4 9 3 4 5 9 8 7 5 6 1 2 1 2 1 2 6 7 8 9 63 5 33 11 88 2 7 9 5 6 2 5 7

I changed the color generator with this example to colors = [(80+ri(100), 80+ri(100), 80+ri(100)) for c in counts] so as to get a more mellow (and map-like) range.