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                 return nil
  35         end
  36         data = get_nodes(pos)
  37         param2 = minetest.get_node(pos).param2
  38         if param2 > 7 then
  39                 return nil
  40         end
  41         if c_node == "main:water" then
  42                 for _,i in pairs(data) do
  43                         nd = i[2]
  44                         name = nd.name
  45                         par2 = nd.param2
  46                         if name == "main:waterflow" and par2 == 7 then
  47                                 return(vector.subtract(i[1],pos))
  48                         end
  49                 end
  50         end
  51         for _,i in pairs(data) do
  52                 nd = i[2]
  53                 name = nd.name
  54                 par2 = nd.param2
  55                 if name == "main:waterflow" and par2 < param2 then
  56                         return(vector.subtract(i[1],pos))
  57                 end
  58         end
  59         for _,i in pairs(data) do
  60                 nd = i[2]
  61                 name = nd.name
  62                 par2 = nd.param2
  63                 if name == "main:waterflow" and par2 >= 11 then
  64                         return(vector.subtract(i[1],pos))
  65                 end
  66         end
  67         for _,i in pairs(data) do
  68                 nd = i[2]
  69                 name = nd.name
  70                 par2 = nd.param2
  71                 tmp = minetest.registered_nodes[name]
  72                 if tmp and not tmp.walkable and name ~= "main:waterflow" and name ~= "main:water" then
  73                         return(vector.subtract(i[1],pos))
  74                 end
  75         end
  76
  77         return nil
  78 end
  79
  80 function flow(pos)
  81         return(get_flowing_dir(pos))
  82 end