1 files changed, 59 insertions, 0 deletions
diff --git a/homedecor_common/nodeboxes.lua b/homedecor_common/nodeboxes.lua
new file mode 100644
index 0000000..c0a7df7
--- /dev/null
+++ b/homedecor_common/nodeboxes.lua
@@ -0,0 +1,59 @@
+-- please keep any non-generic nodeboxe with its node definition
+-- this file should not accumulate any left over nodeboxes
+-- but is meant to host any abstractions or calculations based on nodeboxes
+
+-- a box is defined as {x1, y1, z1, x2, y2, z2}
+homedecor.box = {
+	-- slab starting from -x (after rotation: left)
+	slab_x = function(depth) return { -0.5, -0.5, -0.5, -0.5+depth, 0.5, 0.5 } end,
+	-- bottom slab (starting from -y) with height optionally shifted upwards
+	slab_y = function(height, shift) return { -0.5, -0.5+(shift or 0), -0.5, 0.5, -0.5+height+(shift or 0), 0.5 } end,
+	-- slab starting from -z (+z with negative depth)
+	slab_z = function(depth)
+		-- for consistency with the other functions here, we have to assume that a "z" slab starts from -z and extends by depth,
+		-- but since conventionally a lot of nodes place slabs against +z for player convenience, we define
+		-- a "negative" depth as a depth extending from the other side, i.e. +z
+		if depth > 0 then
+			-- slab starting from -z
+			return { -0.5, -0.5, -0.5, 0.5, 0.5, -0.5+depth }
+		else
+			-- slab starting from +z (z1=0.5-(-depth))
+			return { -0.5, -0.5, 0.5+depth, 0.5, 0.5, 0.5 }
+		end
+	end,
+	bar_y = function(radius) return {-radius, -0.5, -radius, radius, 0.5, radius} end,
+	cuboid = function(radius_x, radius_y, radius_z) return {-radius_x, -radius_y, -radius_z, radius_x, radius_y, radius_z} end,
+}
+
+homedecor.nodebox = {
+	-- { -0.5, -0.5, -0.5, 0.5, 0.5, 0.5 },
+	-- can be used in-place as:
+	-- { type="regular" },
+	regular = { type="regular" },
+	null = { type = "fixed", fixed = { 0, 0, 0, 0, 0, 0 } },
+	corner_xz = function(depth_x, depth_z) return {
+		type="fixed",
+		fixed={
+			homedecor.box.slab_x(depth_x),
+			homedecor.box.slab_z(depth_z),
+		-- { -0.5, -0.5, -0.5, 0.5-depth, 0.5, -0.5+depth } -- slab_x without the overlap, but actually looks a bit worse
+		}
+	} end,
+}
+
+local mt = {}
+mt.__index = function(table, key)
+	local ref = homedecor.box[key]
+	local ref_type = type(ref)
+	if ref_type == "function" then
+		return function(...)
+			return { type = "fixed", fixed = ref(...) }
+		end
+	elseif ref_type == "table" then
+		return { type = "fixed", fixed = ref }
+	elseif ref_type == "nil" then
+		error(key .. "could not be found among nodebox presets and functions")
+	end
+	error("unexpected datatype " .. tostring(type(ref)) .. " while looking for " .. key)
+end
+setmetatable(homedecor.nodebox, mt)