Add mob spawning test structures

/spawnstruct spawncircle and spawncircle_lit

mobtest/init.lua

@@ -1,4 +1,13 @@
 math.randomseed(os.time())
+
+local function get_point_on_circle(pos,r,n)
+	local rt = {}
+	for i=1, n do
+		table.insert(rt,vector.offset(pos,r * math.cos(((i-1)/n) * (2*math.pi)),0,  r* math.sin(((i-1)/n) * (2*math.pi)) ))
+	end
+	return rt[math.random(#rt)]
+end
+
 minetest.register_chatcommand("mobtest",{
 	description="Spawns all available mobs",
 	privs={server=true},
@@ -7,7 +16,7 @@ minetest.register_chatcommand("mobtest",{
 	local pos=p:get_pos()
 	for k,v in pairs(minetest.registered_entities) do
 		if v.is_mob then
-			local spos=vector.add(pos,vector.new(math.random(100)-50,0,math.random(100)-50))
+			local spos=vector.add(pos,get_point_on_circle(pos,28,32))
 			local o = mcl_mobs.spawn(spos,v.name)
 			if o then
 				local l=o:get_luaentity()
@@ -19,3 +28,67 @@ minetest.register_chatcommand("mobtest",{
 		end
 	end
 end})
+
+mcl_structures.register_structure("spawncircle",{
+	place_func = function(pos,def,pr)
+		local p1 = vector.offset(pos,-36,-5,-36)
+		local p2 = vector.offset(pos,36,5,36)
+		local nn1 = minetest.find_nodes_in_area_under_air(p1,p2,{"group:solid","group:plant","group:leaves","group:tree","group:mushroom"})
+		local c1 = {}
+		local c2 = {}
+		for k,v in pairs(nn1) do
+			local dst1=vector.distance(vector.round(vector.new(pos.x,0,pos.z)),vector.round(vector.new(v.x,0,v.z)))
+			local dst2=vector.distance(vector.round(vector.new(pos.x,0,pos.z)),vector.round(vector.new(v.x,0,v.z)))
+			if  dst1 > 20 and dst1 < 22 then
+				table.insert(c1,v)
+			elseif  dst2 > 33 and dst2 < 35 then
+				table.insert(c2,v)
+			end
+		end
+		local cobble = {}
+		local brick = {}
+		for k,v in pairs(c1) do
+			for i=1,6 do table.insert(cobble,vector.offset(v,0,(i-1),0)) end
+			minetest.set_node(vector.offset(v,0,6,0),{name="mcl_stairs:slab_andesite_smooth"})
+		end
+		for k,v in pairs(c2) do
+			for i=1,8 do table.insert(brick,vector.offset(v,0,(i-1),0)) end
+			minetest.set_node(vector.offset(v,0,8,0),{name="mcl_stairs:slab_diorite_smooth"})
+		end
+		minetest.bulk_set_node(cobble,{name="mcl_core:cobble"})
+		minetest.bulk_set_node(brick,{name="mcl_core:stonebrick"})
+		minetest.set_node(vector.offset(pos,0,-1,0),{name="mcl_core:obsidian"})
+	end
+},true)
+
+mcl_structures.register_structure("spawncircle_lit",{
+	place_func = function(pos,def,pr)
+		local p1 = vector.offset(pos,-33,-5,-33)
+		local p2 = vector.offset(pos,33,5,33)
+		local nn1 = minetest.find_nodes_in_area_under_air(p1,p2,{"group:solid","group:plant","group:leaves","group:tree","group:mushroom"})
+		local c1 = {}
+		local c2 = {}
+		for k,v in pairs(nn1) do
+			local dst1=vector.distance(vector.round(vector.new(pos.x,0,pos.z)),vector.round(vector.new(v.x,0,v.z)))
+			local dst2=vector.distance(vector.round(vector.new(pos.x,0,pos.z)),vector.round(vector.new(v.x,0,v.z)))
+			if  dst1 > 23 and dst1 < 25 then
+				table.insert(c1,v)
+			elseif  dst2 > 31 and dst2 < 33 then
+				table.insert(c2,v)
+			end
+		end
+		local cobble = {}
+		local brick = {}
+		for k,v in pairs(c1) do
+			for i=1,6 do table.insert(cobble,vector.offset(v,0,(i-1),0)) end
+			minetest.set_node(vector.offset(v,0,6,0),{name="mcl_stairs:slab_andesite_smooth"})
+		end
+		for k,v in pairs(c2) do
+			for i=1,8 do table.insert(brick,vector.offset(v,0,(i-1),0)) end
+			minetest.set_node(vector.offset(v,0,8,0),{name="mcl_stairs:slab_diorite_smooth"})
+		end
+		minetest.bulk_set_node(cobble,{name="mcl_nether:glowstone"})
+		minetest.bulk_set_node(brick,{name="mcl_ocean:sea_lantern"})
+		minetest.set_node(vector.offset(pos,0,-1,0),{name="mcl_core:obsidian"})
+	end
+},true)

mobtest/mod.conf

@@ -1,2 +1,2 @@
 name = mobtest
-depends = mcl_mobs
+depends = mcl_mobs, mcl_structures