setup to start modifying other maps

src/map_nextgen.lua

@@ -38,11 +38,15 @@ simplex_map.normalize = function(map, new_min, new_max)
   return map -- superfluous
 end
 
-simplex_map.generate = function(size, scale, min, max)
+simplex_map.generate = function(size, scale, min, max, octaves, lacunarity, gain)
   if type(size) == "table" then
     scale = size.scale
     min = size.min
     max = size.max
+    octaves = size.octaves
+    lacunarity = size.lacunarity
+    gain = size.gain
+
     size = size.size
   end
 
@@ -54,7 +58,7 @@ simplex_map.generate = function(size, scale, min, max)
   for x = 1, map.size do
     map[x] = {}
     for y = 1, map.size do
-      map[x][y] = simplex.FractalBrownianMotion2D(x * scale, y * scale, 7)
+      map[x][y] = simplex.FractalBrownianMotion2D(x * scale, y * scale, octaves, lacunarity, gain)
     end
   end
 
@@ -117,9 +121,18 @@ local generate = function()
   local map = {}
   map.size = 500
   map.tile_size = 1 -- TODO tile_size really shouldn't be the responsibility of the map generator - it's a rendering detail, not a map feature
-  map.altitude = simplex_map.generate(map.size, 0.001, 0, 1) -- meters
-  map.temperature = simplex_map.generate(map.size, 0.005, -89.2, 56.7) -- celsius
-  map.rainfall = simplex_map.generate(map.size, 0.005, 18, 3240) -- millimeters rainfall
+  map.altitude = simplex_map.generate{   -- will be converted to meters
+    size = map.size, scale = 0.001, min = 0, max = 1,
+    octaves = 7, lacunarity = 2, gain = 0.5,
+  }
+  map.temperature = simplex_map.generate{   -- in celsius
+    size = map.size, scale = 0.005, min = 0, max = 1, -- min = -89.2, max = 56.7,
+    octaves = 1, lacunarity = 2, gain = 0.5,
+  }
+  map.rainfall = simplex_map.generate{   -- in millimeters of rainfall
+    size = map.size, scale = 0.005, -- min = 18, max = 3240,
+    octaves = 1, lacunarity = 2, gain = 0.5,
+  }
 
   local function earthlike_altitude_adjustment(altitude)
     -- TODO replace with a simpler function?