better sizing of current status

src/lib/simplex.lua

@@ -556,4 +556,21 @@ function simplex.Seed(seed)
     end
 end
 
+-- TODO test functionality
+function simplex.FractalBrownianMotion2D(x, y, octaves, lacunarity, gain)
+    octaves = octaves or 4
+    lacunarity = lacunarity or 2
+    gain = gain or 0.5
+
+    local total, amplitude, frequency, peak_amplitude = 0, 1, 1, 0
+    for i = 1, octaves do
+        total = total + amplitude * simplex.Noise2D(x * frequency, y * frequency)
+        peak_amplitude = peak_amplitude + amplitude
+        amplitude = amplitude * gain
+        frequency = frequency * lacunarity
+    end
+
+    return total / peak_amplitude   -- normalize to [-1, 1]
+end
+
 return simplex

src/main.lua

@@ -1,3 +1,5 @@
+math.randomseed(os.time())
+
 local map_generator = require "map_nextgen"
 local lovebird = require "lib.lovebird"
 local lume = require "lib.lume"
@@ -81,5 +83,9 @@ love.keypressed = function(key)
     love.event.quit()
   elseif key == "r" then
     love.load()
+  elseif key == "=" then
+    map.tile_size = map.tile_size * 2
+  elseif key == "-" then
+    map.tile_size = map.tile_size / 2
   end
 end

src/map_nextgen.lua

@@ -54,7 +54,7 @@ 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.Noise2D(x * scale, y * scale)
+      map[x][y] = simplex.FractalBrownianMotion2D(x * scale, y * scale, 7)
     end
   end
 
@@ -117,7 +117,7 @@ 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, 0.005, 0, 1) -- meters
+  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