save settlements to file and check distance between settlements

buildings.lua

@@ -50,7 +50,10 @@ function settlements.place_settlement_circle(minp, maxp)
   local center_surface = settlements.find_surface(center)
   -- go build settlement around center
   if center_surface then
-    last_time = os.time() + 30
+    -- add settlement to list
+    table.insert(settlements_in_world, center_surface)
+    -- save list to file
+    settlements.save()
     -- initialize all settlement information
     settlements.initialize_settlement()
     -- build well in the center

const.lua

@@ -24,4 +24,5 @@ surface_mat = {
 above_surface_mat = {"default:air","default:dirt_with_snow"}
 under_surface_mat = {"default:stone","default:dirt"}
 schem_path = settlements.modpath.."/schematics/"
-settlement_info = {}
+settlement_info = {}
+settlements_in_world = {}

init.lua

@@ -8,37 +8,27 @@ settlements.modpath = minetest.get_modpath("settlements");
 dofile(settlements.modpath.."/const.lua")
 dofile(settlements.modpath.."/utils.lua")
 dofile(settlements.modpath.."/foundation.lua")
---dofile(settlements.modpath.."/doors.lua")
 dofile(settlements.modpath.."/buildings.lua")
+-- load settlements on server
+settlements_in_world = settlements.load()
 
-
-local function place_settlement(minp, maxp)
-  -- wait xx seconds until building a new settlement 
-  last_time = os.time() + 30
-  -- find locations for buildings
-  local location_list = settlements.find_locations(minp, maxp)
-  if location_list then
-    minetest.chat_send_all("Dorf")
-    -- for each location, build something
-    for i, mpos in ipairs(location_list) do
-      minetest.after(0.5, function()
-          settlements.build_schematic(mpos)
-        end)
-    end
-  end
-end
 --
 -- on map generation, try to build a settlement
 --
-minetest.register_on_generated(function(minp, maxp, seed)
-  if maxp.y < 0 then 
-      return 
-    end
-    if math.random(0,10)<9 or os.time() < last_time then 
+minetest.register_on_generated(function(minp, maxp)
+    if maxp.y < 0 then 
       return 
     end
+    if math.random(0,10)<9 then 
+      -- check if too close to other settlements
+      local center_of_chunk = {x=maxp.x-40, y=maxp.y-40, z=maxp.z-40} 
+      local dist_ok = settlements.check_distance_other_settlements(center_of_chunk)
+      if dist_ok == false then
+        return
+      end
 --    place_settlement(minp, maxp)
-    settlements.place_settlement_circle(minp, maxp)
+      settlements.place_settlement_circle(minp, maxp)
+    end
   end)
 
 --

utils.lua

@@ -52,50 +52,32 @@ function settlements.check_distance(building_pos, building_size)
   return true
 end
 --
--- Function to find random positions
--- returns array with coords where houses are built
---
-function settlements.find_locations(minp, maxp)
--- Anzahl Gebäude
-  local amount_of_buildings = 10 --math.random(5,10) 
-  local location_list = {}
--- Mindest und maxi Abstand
-  local radius = 1000
-  local housemindist = 7
-  local housemaxdist = 1000
-  local centeroftown -- Erste location ist Mittelpunkt des Dorfes
-  local tries = 500 -- 500 Versuche, ne geeignete Location zu finden
-  local count = 0
---
-  for i = 1,amount_of_buildings do
--- Zufallslocation finden
-    ::neuerversuch:: -- Sprungpunkt, falls Abstand nicht passt
-    count = count + 1
-    -- nicht unendlich oft probieren, sonst endlos schleife
-    if count > tries then return nil end
-    local tpos = {x=math.random(minp.x,maxp.x), y=math.random(minp.y,maxp.y), z=math.random(minp.z,maxp.z)} 
-    if tpos.y < 0 then goto neuerversuch end
-    local mpos = settlements.find_surface(tpos)
-    if not mpos or mpos == nil or mpos.y < 0 then goto neuerversuch end
-
--- vor dem Ablegen in die Liste, Abstand zu bisherigen locations finden, sobald mehr als eine location gefunden wurde
-    if i > 1 then
--- bisherige Liste durchgehen und mit aktueller mpos vergleichen
-      for j, saved_location in ipairs(location_list) do
-        local distanceToCenter = math.sqrt(((centeroftown.x - mpos.x)*(centeroftown.x - mpos.x))+((centeroftown.y - mpos.y)*(centeroftown.y - mpos.y)))
-        local distanceTohouses = math.sqrt(((saved_location.x - mpos.x)*(saved_location.x - mpos.x))+((saved_location.y - mpos.y)*(saved_location.y - mpos.y)))
+function settlements.save()
+  local file = io.open(minetest.get_worldpath().."/settlements.txt", "w")
+  if file then
+    file:write(minetest.serialize(settlements_in_world))
+    file:close()
+  end
+end
 
--- nicht weiter als 
-        --               if distanceToCenter > radius or distanceTohouses < housemindist or distanceTohouses > housemaxdist then
-        if distanceTohouses < housemindist then
-          goto neuerversuch
-        end
-      end
-      location_list[i] = mpos
-    else
-      location_list[i] = mpos
-      centeroftown = mpos
+function settlements.load()
+  local file = io.open(minetest.get_worldpath().."/settlements.txt", "r")
+  if file then
+    local table = minetest.deserialize(file:read("*all"))
+    if type(table) == "table" then
+      return table
     end
   end
-  return location_list
+  return {}
 end
+
+function settlements.check_distance_other_settlements(center_new_chunk)
+  local min_dist_settlements = 1000
+  for i, pos in ipairs(settlements_in_world) do 
+    local distance = vector.distance(center_new_chunk, pos)
+    if distance < min_dist_settlements then
+      return false
+    end
+  end  
+  return true
+end