attempt using layered additive colors

src/main.moon

@@ -1,9 +1,6 @@
 size = 500
 debug = false
 
-love.load = ->
-  love.window.setMode size, size
-
 biomes = {
   "frozen desert": { 1/3, 0.75, 0.76, 1, h: 0.5, p: 0.12, t: 0 }
   swamp: { 65/255, 104/255, 37/255, 1, h: 0.1, p: 1, t: 0.8 }
@@ -33,17 +30,85 @@ d2 = (A, B) ->
 
 colors = {}
 
-for h = 0, size
-  colors[h] = {}
-  for t = 0, size
-    distances = {}
-    for name, biome in pairs biomes
-      table.insert distances, { d2({biome.h, biome.t}, {h/size, t/size}), name, biome }
-    table.sort distances, (A, B) -> return A[1] < B[1]
-    colors[h][t] = distances[1][3]
+merge = (A, B, d) ->
+  A[4] = A[4] or 1
+  B[4] = B[4] or 1
+  c = 1
+  f = 1 - d
+  r = math.sqrt ((A[1]*c)^2 + (B[1]*d)^2) / (2 - f)
+  g = math.sqrt ((A[2]*c)^2 + (B[2]*d)^2) / (2 - f)
+  b = math.sqrt ((A[3]*c)^2 + (B[3]*d)^2) / (2 - f)
+  a = math.sqrt ((A[4]*c)^2 + (B[4]*d)^2) / (2 - f)
+  -- r = math.abs (A[1] + B[1]*d) / (2 - f)
+  -- g = math.abs (A[2] + B[2]*d) / (2 - f)
+  -- b = math.abs (A[3] + B[3]*d) / (2 - f)
+  -- a = math.abs (A[4] + B[4]*d) / (2 - f)
+  -- r = math.sqrt math.abs(A[1]^2 - B[1]^2)*d + A[1]^2
+  -- g = math.sqrt math.abs(A[2]^2 - B[2]^2)*d + A[2]^2
+  -- b = math.sqrt math.abs(A[3]^2 - B[3]^2)*d + A[3]^2
+  -- a = math.sqrt math.abs(A[4]^2 - B[4]^2)*d + A[4]^2
+  -- r = math.sqrt (A[1]^2 + B[1]^2) / 2
+  -- g = math.sqrt (A[2]^2 + B[2]^2) / 2
+  -- b = math.sqrt (A[3]^2 + B[3]^2) / 2
+  -- a = math.sqrt (A[4]^2 + B[4]^2) / 2
+  return { r, g, b, a }
+
+love.load = ->
+  love.window.setMode size, size
+
+  for h = 0, size
+    colors[h] = {}
+    for t = 0, size
+      colors[h][t] = { 0, 0, 0, 1 }
+
+  max = 0
+  for name, biome in pairs biomes
+    for h = 0, size
+      for t = 0, size
+        v = 1 - math.sqrt d2({biome.h, biome.t}, {h/size, t/size})
+        color = colors[h][t]
+        color[1] += biome[1] * v
+        color[2] += biome[2] * v
+        color[3] += biome[3] * v
+        max = color[1] if color[1] > max
+        max = color[2] if color[2] > max
+        max = color[3] if color[3] > max
+        -- print color[1], color[2], color[3], color[4]
+
+  for h = 0, size
+    for t = 0, size
+      color = colors[h][t]
+      color[1] /= max
+      color[2] /= max
+      color[3] /= max
+
+  if true return
+
+
+
+  for h = 0, size
+    colors[h] = {}
+    for t = 0, size
+      distances = {} -- format: distance, biome name, biome colors
+      for name, biome in pairs biomes
+        table.insert distances, { d2({biome.h, biome.t}, {h/size, t/size}), name, biome }
+      table.sort distances, (A, B) -> return A[1] < B[1]
+      -- colors[h][t] = distances[1][3]
+
+      -- distanceA, distanceB = 28, 99
+      -- relative distance is B - A (71)
+      -- ratio = 28/99 = 0.28 mix of B
+      -- another example, w 30 and 31... 0.91 (way to high..either divide it in half OR...smaller/difference?)
+
+      d = distances[1][1] / distances[2][1] --/ 2
+      colors[h][t] = merge(distances[1][3], distances[2][3], d)
 
 love.draw = ->
   for x = 1, size
+    -- green = size / x
+    -- yellow = 1 - green
+    -- yg = math.min green, yellow
+    -- love.graphics.setColor yellow, yg, 0, 1
     for y = 1, size
       love.graphics.setColor colors[x][y]
       love.graphics.points x, y