init little circle planet

src/main.lua

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+local heightmap = require "lib.heightmap"
+local lovebird = require "lib.lovebird"
+local lume = require "lib.lume"
+
+local map = {}
+
+love.load = function()
+  map.size = 150
+  map.height = heightmap.create(map.size, map.size, 0, 1)
+  map.temperature = heightmap.create(map.size, map.size, 0, 1)
+  map.humidity = heightmap.create(map.size, map.size, 0, 1)
+
+  -- weird mixing idea test
+  -- why does this average things out?
+  -- trying to renormalize it now..
+  local temporary_maps = {}
+  for i = 1, 3 do
+    temporary_maps[i] = heightmap.create(map.size, map.size, 0, 1)
+  end
+  for x = 0, map.height.w do
+    for y = 0, map.height.h do
+      map.height[x][y] = (map.height[x][y] + temporary_maps[1][x][y] + temporary_maps[2][x][y] + temporary_maps[3][x][y] ) / 4
+    end
+  end
+  heightmap.normalize(map.height, 0, 1)
+
+  -- if true then return end
+
+  -- lower temperature by half height
+  -- NOTE ruins "normalization" but that's fine once we have "real" numbers to work with
+  for x = 0, map.temperature.w do
+    for y = 0, map.temperature.h do
+      map.temperature[x][y] = math.max(0, map.temperature[x][y] - map.height[x][y] / 2)
+    end
+  end
+
+  -- modify temperature by latitude
+  -- TODO would be more efficient to calculate Y in outer loop, since X does not change the distance
+  -- NOTE only subtracts temperature, which further "ruins normalization" and makes everything too cold:
+  local center_y = map.size / 2
+  for x = 0, map.temperature.w do
+    for y = 0, map.temperature.h do
+      local distance = math.abs(y - center_y)
+      map.temperature[x][y] = lume.clamp(map.temperature[x][y] - distance / map.size / 2, 0, 1)
+    end
+  end
+
+  -- increase humidity by half temperature
+  for x = 0, map.humidity.w do
+    for y = 0, map.humidity.h do
+      map.humidity[x][y] = math.min(1, map.humidity[x][y] + map.temperature[x][y] / 2)
+    end
+  end
+
+  -- planetizer!
+  local radius = (map.size / 2)^2
+  for x = 0, map.height.w do
+    for y = 0, map.height.h do
+      if lume.distance(x, y, map.size / 2, map.size / 2, true) > radius then
+        map.height[x][y] = nil
+      end
+    end
+  end
+end
+
+love.update = function(dt)
+  lovebird.update()
+end
+
+love.draw = function()
+  local tile_size = 2
+
+  for x = 0, map.height.w do
+    for y = 0, map.height.h do
+      -- raw heightmap
+      -- NOTE will break with planetizer enabled!
+      -- local value = map.height[x][y]
+      -- love.graphics.setColor(value, value, value, 1)
+      -- love.graphics.rectangle("fill", x * tile_size, y * tile_size, tile_size, tile_size)
+
+      -- even weighting between height and temperature
+      -- local value = map.height[x][y] / 2 + map.temperature[x][y] / 2
+      -- if value < 0.2 then
+      --   love.graphics.setColor(0, 0, 1, 1)
+      -- elseif value < 0.215 then
+      --   love.graphics.setColor(1, 1, 0, 1)
+      -- elseif value < 0.34 then
+      --   love.graphics.setColor(0, 1, 0, 1)
+      -- elseif value < 0.72 then
+      --   love.graphics.setColor(0, 0.67, 0, 1)
+      -- elseif value < 0.9 then
+      --   love.graphics.setColor(0.67, 0.67, 0.67, 1)
+      -- else
+      --   -- love.graphics.setColor(0, 0, 0, 1) -- temporary nothing
+      --   love.graphics.setColor(1, 1, 1, 1)
+      -- end
+      -- love.graphics.rectangle("fill", x * tile_size, y * tile_size, tile_size, tile_size)
+
+      -- temperature map
+      local value = map.temperature[x][y]
+      love.graphics.setColor(value, 0, 0, 1)
+      love.graphics.rectangle("fill", map.size * tile_size + x * tile_size, y * tile_size, tile_size, tile_size)
+
+      -- humidity map
+      local value = map.humidity[x][y]
+      love.graphics.setColor(0, 0, value, 1)
+      love.graphics.rectangle("fill", x * tile_size, map.size * tile_size + y * tile_size, tile_size, tile_size)
+
+      -- "naive" biomed map
+      local value = map.height[x][y]
+      if value then
+        if value < 0.2 then
+          love.graphics.setColor(0, 0, 1, 1)
+        elseif value < 0.215 then
+          love.graphics.setColor(1, 1, 0, 1)
+        elseif value < 0.34 then
+          love.graphics.setColor(0, 1, 0, 1)
+        elseif value < 0.72 then
+          love.graphics.setColor(0, 0.67, 0, 1)
+        elseif value < 0.9 then
+          love.graphics.setColor(0.67, 0.67, 0.67, 1)
+        else
+          -- love.graphics.setColor(0, 0, 0, 1) -- temporary nothing
+          love.graphics.setColor(1, 1, 1, 1)
+        end
+        love.graphics.rectangle("fill", map.size * tile_size + x * tile_size, map.size * tile_size + y * tile_size, tile_size, tile_size)
+      end
+    end
+  end
+end
+
+love.keypressed = function(key)
+  if key == "escape" then
+    love.event.quit()
+  elseif key == "r" then
+    love.load()
+  end
+end