declassify some projects

heavbiome/main.lua

@@ -0,0 +1,93 @@
+local map = {}
+local w = 300
+local h = 300
+local seed = 349259
+require("perlin") -- not mine.
+-- it uses globals. spiteful, but i do not care enough about code quality for this.
+
+
+local biomecols = {
+    empty      = {0.5, 0.5, 0.5},
+    forest     = {  0, 0.5,   0},
+    rainforest = {  0, 0.5, 0.5},
+    ocean      = {  0,   0,   1},
+    plains     = {  0,   1,   0},
+    desert     = {  1,   1,   0},
+}
+
+local PERSISTENCE = 0.3
+local ITERS = 4
+local function oct_noise(x, y, seed, gen)
+    local total = 0
+    local frequency = 1
+    local amplitude = 1
+    local norm = 0
+    for i = 1, ITERS do
+        total = total + gen:noise(x * frequency, y * frequency, seed + i) * amplitude
+        norm = norm + amplitude
+        frequency = frequency * 2
+        amplitude = amplitude * PERSISTENCE
+    end
+    return total
+end
+
+local sf = 1/20 -- scaling factor.
+local function pick_biome(x, y, gen)
+    local islandicity = gen:noise(x*sf/10, y*sf/10, 302382359)/2+1/2
+    islandicity = math.min(math.max(0,islandicity*3),1)
+    local mainland_modifier = gen:noise(x*sf/20, y*sf/20, 302382359)/2
+    local is_ocean = gen:noise(x*sf/4, y*sf/4, 555575)/2+1/2 + gen:noise(x*sf, y*sf, 555575)/(25-islandicity*10) + mainland_modifier
+    local humidity = oct_noise(x*sf/2, y*sf/2, 10000, gen)/2+1/2
+    local temp = oct_noise(x*sf/6, y*sf/6, 20000, gen)/2+1/2
+    --return { is_ocean, humidity, temp }
+    --
+    if is_ocean > 0.45 then return "ocean" end
+    if is_ocean > 0.43 and humidity < 0.6 then return "desert" end -- coast?
+    if temp > 0.75 then return "desert" end
+    if humidity < 0.5 then
+        if temp > 0.5 then
+            return "desert"
+        else
+            return "plains"
+        end
+    else
+        if humidity > 0.75 then
+            return "rainforest"
+        else
+            if temp < 0.6 then
+                return "forest"
+            else
+                return "plains"
+            end
+        end
+    end
+    return "empty"
+    --]]
+end
+
+function love.load()
+    local noise = perlin(seed)
+    local gen = noise
+    for x=1, w do
+        map[x] = {}
+        for y=1, h do
+            map[x][y] = 0
+        end
+    end
+    for x=1, w do
+        for y=1, h do
+            local biome = pick_biome(x, y, noise)
+            --map[x][y] = biome
+            map[x][y] = biomecols[biome]
+        end
+    end
+end
+
+function love.draw()
+    for x=1, w do
+        for y=1, h do
+            love.graphics.setColor(unpack(map[x][y]))
+            love.graphics.rectangle("fill",x*2, y*2, 2, 2)
+        end
+    end
+end