-def make_map():
- """(Re-)make island map.
-
- Let "~" represent water, "." land, "X" trees: Build island shape randomly,
- start with one land cell in the middle, then go into cycle of repeatedly
- selecting a random sea cell and transforming it into land if it is neighbor
- to land. The cycle ends when a land cell is due to be created at the map's
- border. Then put some trees on the map (TODO: more precise algorithm desc).
- """
-
- def is_neighbor(coordinates, type):
- y = coordinates[0]
- x = coordinates[1]
- length = world_db["MAP_LENGTH"]
- ind = y % 2
- diag_west = x + (ind > 0)
- diag_east = x + (ind < (length - 1))
- pos = (y * length) + x
- if (y > 0 and diag_east
- and type == chr(world_db["MAP"][pos - length + ind])) \
- or (x < (length - 1)
- and type == chr(world_db["MAP"][pos + 1])) \
- or (y < (length - 1) and diag_east
- and type == chr(world_db["MAP"][pos + length + ind])) \
- or (y > 0 and diag_west
- and type == chr(world_db["MAP"][pos - length - (not ind)])) \
- or (x > 0
- and type == chr(world_db["MAP"][pos - 1])) \
- or (y < (length - 1) and diag_west
- and type == chr(world_db["MAP"][pos + length - (not ind)])):
- return True
- return False
-
- world_db["MAP"] = bytearray(b'~' * (world_db["MAP_LENGTH"] ** 2))
- length = world_db["MAP_LENGTH"]
- add_half_width = (not (length % 2)) * int(length / 2)
- world_db["MAP"][int((length ** 2) / 2) + add_half_width] = ord(".")
- while (1):
- y = rand.next() % length
- x = rand.next() % length
- pos = (y * length) + x
- if "~" == chr(world_db["MAP"][pos]) and is_neighbor((y, x), "."):
- if y == 0 or y == (length - 1) or x == 0 or x == (length - 1):
- break
- world_db["MAP"][pos] = ord(".")
- n_trees = int((length ** 2) / 16)
- i_trees = 0
- while (i_trees <= n_trees):
- single_allowed = rand.next() % 32
- y = rand.next() % length
- x = rand.next() % length
- pos = (y * length) + x
- if "." == chr(world_db["MAP"][pos]) \
- and ((not single_allowed) or is_neighbor((y, x), "X")):
- world_db["MAP"][pos] = ord("X")
- i_trees += 1
- # This all-too-precise replica of the original C code misses iter_limit().
-
-