handlers/nodeboxes.lua

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