mods/flow_lib/init.lua

   1 --this is from https://github.com/HybridDog/builtin_item/blob/e6dfd9dce86503b3cbd1474257eca5f6f6ca71c2/init.lua#L50
   2 local
   3 minetest,vector,math,pairs
   4 =
   5 minetest,vector,math,pairs
   6
   7 local tab
   8 local n
   9 local function get_nodes(pos)
  10         tab,n = {},1
  11         for i = -1,1,2 do
  12                 for _,p in pairs({
  13                         {x=pos.x+i, y=pos.y, z=pos.z},
  14                         {x=pos.x, y=pos.y, z=pos.z+i}
  15                 }) do
  16                         tab[n] = {p, minetest.get_node(p)}
  17                         n = n+1
  18                 end
  19         end
  20         return tab
  21 end
  22
  23
  24 local data
  25 local param2
  26 local nd
  27 local par2
  28 local name
  29 local tmp
  30 local c_node
  31 local function get_flowing_dir(pos)
  32         c_node = minetest.get_node(pos).name
  33         if c_node ~= "main:waterflow" and c_node ~= "main:water" then
  34                 print("return initial")
  35                 return nil
  36         end
  37         data = get_nodes(pos)
  38         param2 = minetest.get_node(pos).param2
  39         if param2 > 7 then
  40                 print("return 0")
  41                 return nil
  42         end
  43         if c_node == "main:water" then
  44                 for _,i in pairs(data) do
  45                         nd = i[2]
  46                         name = nd.name
  47                         par2 = nd.param2
  48                         if name == "main:waterflow" and par2 == 7 then
  49                                 return(vector.subtract(i[1],pos))
  50                         end
  51                 end
  52         end
  53         for _,i in pairs(data) do
  54                 nd = i[2]
  55                 name = nd.name
  56                 par2 = nd.param2
  57                 if name == "main:waterflow" and par2 < param2 then
  58                         print("return 1")
  59                         return(vector.subtract(i[1],pos))
  60                 end
  61         end
  62         for _,i in pairs(data) do
  63                 nd = i[2]
  64                 name = nd.name
  65                 par2 = nd.param2
  66                 if name == "main:waterflow" and par2 >= 11 then
  67                         print("return 2")
  68                         return(vector.subtract(i[1],pos))
  69                 end
  70         end
  71         for _,i in pairs(data) do
  72                 nd = i[2]
  73                 name = nd.name
  74                 par2 = nd.param2
  75                 tmp = minetest.registered_nodes[name]
  76                 if tmp and not tmp.walkable and name ~= "main:waterflow" and name ~= "main:water" then
  77                         print("return 3")
  78                         return(vector.subtract(i[1],pos))
  79                 end
  80         end
  81
  82         return nil
  83 end
  84
  85 function flow(self,pos)
  86         return(get_flowing_dir(pos))
  87 end