Less dense forests, make map sections square, better documentation.

mapgen.lua

@@ -1,8 +1,8 @@
 --- Procedural generation methods
 
 function init_mapgen()
-   uid_seed = 1229 -- arbitrarily chosen number
-   block_size = 128
+   uid_seed = 2229 -- arbitrarily chosen number
+   block_size = 64
 
    -- Sprite ratios for different biomes, of the form { "biome_name": {frequency, sprite index} ... } }
    -- frequencies don't have to add up to 100, but they should by convention
@@ -15,12 +15,12 @@ function init_mapgen()
    --  * 6 - pink flowers
    --  * 7 - mushrooms
    biomes = { grassland = { {40, 2}, {28, 5}, {28, 6}, {3, 3}, {1, 4} },
-              forest = { {40, 2}, {50, 4}, {5, 3}, {4, 5}, {1, 7} } }
+              forest = { {50, 2}, {40, 4}, {5, 3}, {4, 5}, {1, 7} } }
    
    build_biome("forest")
 end
 
--- use biome1
+-- use biome1 if mix == false
 function build_biome(biome1, biome2, mix)
    if mix == true then
    else
@@ -28,6 +28,9 @@ function build_biome(biome1, biome2, mix)
    end
 
    -- global variable used for lookup during mapgen
+   -- build_biome() writes the biome_lookup table such
+   -- that biome_lookup[uid] returns a sprite index,
+   -- weighted by the frequency information for current biome.
    biome_lookup = {}
    for i=1,#frequencies do
       local tuple=frequencies[i]