handlers/nodeboxes.lua

   1 xdecor.box = {
   2         slab_y = function(height, shift)
   3                 return {
   4                         -0.5,
   5                         -0.5 + (shift or 0),
   6                         -0.5,
   7                          0.5,
   8                         -0.5 + height + (shift or 0),
   9                          0.5
  10                 }
  11         end,
  12         slab_z = function(depth)
  13                 return {-0.5, -0.5, -0.5 + depth, 0.5, 0.5, 0.5}
  14         end,
  15         bar_y = function(radius)
  16                 return {-radius, -0.5, -radius, radius, 0.5, radius}
  17         end,
  18         cuboid = function(radius_x, radius_y, radius_z)
  19                 return {-radius_x, -radius_y, -radius_z, radius_x, radius_y, radius_z}
  20         end
  21 }
  22
  23 xdecor.nodebox = {
  24         regular = {type = "regular"},
  25         null = {
  26                 type = "fixed", fixed = {0,0,0,0,0,0}
  27         }
  28 }
  29
  30 xdecor.pixelbox = function(size, boxes)
  31         local fixed = {}
  32         for _, box in ipairs(boxes) do
  33                 -- `unpack` has been changed to `table.unpack` in newest Lua versions.
  34                 local x, y, z, w, h, l = unpack(box)
  35                 fixed[#fixed + 1] = {
  36                         (x / size) - 0.5,
  37                         (y / size) - 0.5,
  38                         (z / size) - 0.5,
  39                         ((x + w) / size) - 0.5,
  40                         ((y + h) / size) - 0.5,
  41                         ((z + l) / size) - 0.5
  42                 }
  43         end
  44
  45         return {type = "fixed", fixed = fixed}
  46 end
  47
  48 local mt = {}
  49
  50 mt.__index = function(table, key)
  51         local ref = xdecor.box[key]
  52         local ref_type = type(ref)
  53
  54         if ref_type == "function" then
  55                 return function(...)
  56                         return {type = "fixed", fixed = ref(...)}
  57                 end
  58         elseif ref_type == "table" then
  59                 return {type = "fixed", fixed = ref}
  60         elseif ref_type == "nil" then
  61                 error(key .. "could not be found among nodebox presets and functions")
  62         end
  63
  64         error("unexpected datatype " .. tostring(type(ref)) .. " while looking for " .. key)
  65 end
  66
  67 setmetatable(xdecor.nodebox, mt)