goddammit git I TOLD you to commit this

src/lib/simplex_map.lua

@@ -0,0 +1,77 @@
+local simplex = require "lib.simplex"
+
+local simplex_map = {}
+
+simplex_map.min = function(map)
+  local r = math.huge
+  for i=1,#map do
+    if map[i] then
+      for j=1,#map[1] do
+        local v = map[i][j]
+        if v and r > v then r = v end
+      end
+    end
+  end
+  return r
+end
+simplex_map.max = function(map)
+  local r = -math.huge
+  for i=1,#map do
+    if map[i] then
+      for j=1,#map[1] do
+        local v = map[i][j]
+        if v and r < v then r = v end
+      end
+    end
+  end
+  return r
+end
+
+simplex_map.normalize = function(map, new_min, new_max)
+  local minimum = simplex_map.min(map)
+  local initialRange = simplex_map.max(map) - minimum
+  local finalRange = new_max - new_min
+  for i = 1, #map do
+    for j = 1, #map[1] do
+      map[i][j] = (map[i][j] - minimum) / initialRange * finalRange + new_min
+    end
+  end
+  map.min = simplex_map.min(map)
+  map.max = simplex_map.max(map)
+  return map -- superfluous
+end
+
+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
+
+  simplex.Seed(math.random())
+  local map = {}
+  map.size = size
+
+  scale = scale or 0.005
+  for x = 1, map.size do
+    map[x] = {}
+    for y = 1, map.size do
+      map[x][y] = simplex.FractalBrownianMotion2D(x * scale, y * scale, octaves, lacunarity, gain)
+    end
+  end
+
+  if min or max then
+    min = min or 0
+    max = max or 1
+    simplex_map.normalize(map, min, max)
+  end
+
+  return map
+end
+
+return simplex_map