Add VoxelArea() constructor (#12886)

builtin/game/voxelarea.lua

@@ -8,7 +8,10 @@ VoxelArea = {
 	zstride = 0,
 }
 
-function VoxelArea:new(o)
+local class_metatable = {}
+setmetatable(VoxelArea, class_metatable)
+
+local function new(self, o)
 	o = o or {}
 	setmetatable(o, self)
 	self.__index = self
@@ -20,6 +23,12 @@ function VoxelArea:new(o)
 	return o
 end
 
+function class_metatable:__call(MinEdge, MaxEdge)
+	return new(self, {MinEdge = MinEdge, MaxEdge = MaxEdge})
+end
+
+VoxelArea.new = new
+
 function VoxelArea:getExtent()
 	local MaxEdge, MinEdge = self.MaxEdge, self.MinEdge
 	return vector_new(

doc/lua_api.txt

@@ -4485,7 +4485,8 @@ Methods
 -----------
 
 A helper class for voxel areas.
-It can be created via `VoxelArea:new({MinEdge = pmin, MaxEdge = pmax})`.
+It can be created via `VoxelArea(pmin, pmax)` or
+`VoxelArea:new({MinEdge = pmin, MaxEdge = pmax})`.
 The coordinates are *inclusive*, like most other things in Minetest.
 
 ### Methods
@@ -4533,7 +4534,7 @@ the axes in a voxel area:
 
 If, for example:
 
-    local area = VoxelArea:new({MinEdge = emin, MaxEdge = emax})
+    local area = VoxelArea(emin, emax)
 
 The values of `ystride` and `zstride` can be obtained using `area.ystride` and
 `area.zstride`.