EXAMPLE MAP:

                                                    ##########  
                                                    #........#  
                                                    #........#  
                                           ##########........#  
                                           #........#........#  
                                      ######.................## 
        ############                  #.......................# 
        #..........#          ###     #.####........#####.....# 
        #..........#          #.#     #.#  #........#   #.....# 
        #..........#          #.#     #.#  #........#   #.....# 
        #..........#        ###.#######.####........#####.....# 
        #..........#        #.................................# 
        #..........#        #........##.####..###########.....# 
        #..........#        #........##...................##### 
        #.##########        #........##..###..#############     
        #.#                 #........##..# #..#                 
        #.#                 #........##..# #..#                 
        #.#                 #........##..# #..#                 
        #.#                 ###.#######..# #..#                 
        #.#                   #.#     #..# #..#                 
        #.#                   #.#     #..# #..#                 
     ####.#####               #.#     #..# #..#                 
     #........#       #########.#     #..# #..#                 
     #........#       #.......#.#     #..# #..#                 
     #........#       #.......#.#     #..# #..#                 
     #........#       #.......#.#   ###..###..#                 
     #........#       #.......#.#   #.........#                 
     #........#       #.......#.#   #.........#                 
     #........#       #.......#.#   #.........#                 
     ####.#.#.#########.......#.#   #.........#                 
 ########.#...................#.#   #.........#                 
 #............................#.#   #.........#                 
 #.######.#...#################.#   #.........#                 
 #.#    #.#...#               #.#   #.........#                 
 #.#    #.#...# ###############.#####.........#                 
 #.#    #.#...# #.............................#      #########  
 #.#    #.#...# #.#############.#######..####.#      #.......#  
 #.#    #.#...# #.#           #.#     #..#  #.#      #.......#  
 #.#    #.#...###.####       ##.#######..#  #.#      #.......#  
 #.#    #.#..........#########...........#  #.#      #.......#  
 #.#    #................................#  #.#      #.......#  
 #.######.#..........#########..##......##  #.#      #.......#  
 #...................#########..##......#####.########.......#  
 #.######.#..................................................#  
 #.#    #.##.........#########...#......#####.########.......#  
 #.#    #.##.........#       #..........#####.#####  #########  
 #.#    #.##.........#       #....................#             
 #.#    #.##.####.####       #..........###.......#             
 #.#    #.##.#  #.#          #..........# #.......#             
 #.#    #.##.####.####       #..........# #.......#             
 #.#    #.#..........#       #.#........# #.......#             
 #.######.#..........#       #.#........# ###.#####             
 #........#..........#       #.#........#   #.#                 
 #........#..........#       #.#........#   #.#                 
 #........#..........#       #.##########   #.#                 
 #........#..........#       #.#            #.#####             
 #........############       #.#            #.....#             
 #........#                  #.#            #######             
 #........#                  #.#                                
 ##########                  ###                                

based on python code by James Spencer: https://pastebin.com/zehq4vMM