Decoration: Change divlen to sidelen

doc/lua_api.txt

@@ -1875,8 +1875,9 @@ Decoration definition (register_decoration)
     deco_type = "simple", -- See "Decoration types"
     place_on = "default:dirt_with_grass",
     ^ Node that decoration can be placed on
-    divlen = 8,
-    ^ Number of divisions made in the chunk being generated
+    sidelen = 8,
+    ^ Size of divisions made in the chunk being generated.
+    ^ If the chunk size is not evenly divisible by sidelen, sidelen is made equal to the chunk size.
     fill_ratio = 0.02,
     ^ Ratio of the area to be uniformly filled by the decoration.
     ^ Used only if noise_params is not specified.

src/mapgen.cpp

@@ -232,8 +232,14 @@ void Decoration::placeDeco(Mapgen *mg, u32 blockseed, v3s16 nmin, v3s16 nmax) {
 	int carea_size = nmax.X - nmin.X + 1;
 
 	// Divide area into parts
-	s16 sidelen = carea_size / divlen;
-	float area = sidelen * sidelen;
+	if (carea_size % sidelen) {
+		errorstream << "Decoration::placeDeco: chunk size is not divisible by "
+			"sidelen; setting sidelen to " << carea_size << std::endl;
+		sidelen = carea_size;
+	}
+	
+	s16 divlen = carea_size / sidelen;
+	int area = sidelen * sidelen;
 
 	for (s16 z0 = 0; z0 < divlen; z0++)
 	for (s16 x0 = 0; x0 < divlen; x0++) {

src/mapgen.h

@@ -199,7 +199,7 @@ class Decoration {
 	int mapseed;
 	std::string place_on_name;
 	content_t c_place_on;
-	s16 divlen;
+	s16 sidelen;
 	float fill_ratio;
 	NoiseParams *np;
 	

src/script/lua_api/luaapi.cpp

@@ -683,7 +683,7 @@ int ModApiBasic::l_register_decoration(lua_State *L)
 
 	deco->c_place_on    = CONTENT_IGNORE;
 	deco->place_on_name = getstringfield_default(L, index, "place_on", "ignore");
-	deco->divlen        = getintfield_default(L, index, "divlen", 8);
+	deco->sidelen       = getintfield_default(L, index, "sidelen", 8);
 	deco->fill_ratio    = getfloatfield_default(L, index, "fill_ratio", 0.02);
 	
 	lua_getfield(L, index, "noise_params");
@@ -749,8 +749,8 @@ int ModApiBasic::l_register_decoration(lua_State *L)
 			break; }
 	}
 	
-	if (deco->divlen <= 0) {
-		errorstream << "register_decoration: divlen must be "
+	if (deco->sidelen <= 0) {
+		errorstream << "register_decoration: sidelen must be "
 			"greater than 0" << std::endl;
 		delete deco;
 		return 0;