visible area cube added

tubelib/forceload.lua

@@ -102,8 +102,11 @@ minetest.register_node("tubelib:forceload", {
 		if add_pos(pos, placer) then
 			minetest.forceload_block(pos, true)
 			local pos1, pos2, num, max = get_data(pos, placer)
-			M(pos):set_string("infotext", "Area "..S(pos1).." to "..S(pos2).." loaded!")
+			M(pos):set_string("infotext", "Area "..S(pos1).." to "..S(pos2).." loaded!\n"..
+				"Punch the block to make the area visible.")
 			chat(placer, "Area ("..num.."/"..max..") "..S(pos1).." to "..S(pos2).." loaded!")
+			tubelib.mark_region(placer:get_player_name(), pos1, pos2)
+			M(pos):set_string("owner", placer:get_player_name())
 		else
 			chat(placer, "Max. number of Forceload Blocks reached!")
 			minetest.remove_node(pos)
@@ -114,6 +117,12 @@ minetest.register_node("tubelib:forceload", {
 	after_dig_node = function(pos, oldnode, oldmetadata, digger)
 		del_pos(pos, digger)
 		minetest.forceload_free_block(pos, true)
+		tubelib.unmark_region(oldmetadata.fields.owner)
+	end,
+	
+	on_punch = function(pos, node, puncher, pointed_thing)
+		local pos1, pos2 = calc_area(pos)
+		tubelib.switch_region(puncher:get_player_name(), pos1, pos2)
 	end,
 
 	paramtype = "light",

tubelib/init.lua

@@ -103,5 +103,6 @@ dofile(minetest.get_modpath("tubelib") .. "/lamp.lua")
 dofile(minetest.get_modpath("tubelib") .. "/distributor.lua")
 dofile(minetest.get_modpath("tubelib") .. "/legacy_nodes.lua")
 dofile(minetest.get_modpath("tubelib") .. "/repairkit.lua")
+dofile(minetest.get_modpath("tubelib") .. "/mark.lua")
 dofile(minetest.get_modpath("tubelib") .. "/forceload.lua")
 

tubelib/mark.lua

@@ -0,0 +1,93 @@
+--[[
+
+	Tube Library
+	============
+
+	Copyright (C) 2019 Joachim Stolberg
+	Code derived from wordedit (sfan5, Anthony Zhang (Uberi/Temperest), and Brett O'Donnell (cornernote))
+
+	LGPLv2.1+
+	See LICENSE.txt for more information
+
+	mark.lua:
+	
+]]--
+
+local marker_region = {}
+
+function tubelib.unmark_region(name)
+	if marker_region[name] ~= nil then --marker already exists
+		--wip: make the area stay loaded somehow
+		for _, entity in ipairs(marker_region[name]) do
+			entity:remove()
+		end
+		marker_region[name] = nil
+	end
+end
+
+function tubelib.mark_region(name, pos1, pos2)
+
+	tubelib.unmark_region(name)
+	
+	local thickness = 0.2
+	local sizex, sizey, sizez = (1 + pos2.x - pos1.x) / 2, (1 + pos2.y - pos1.y) / 2, (1 + pos2.z - pos1.z) / 2
+	local markers = {}
+
+	--XY plane markers
+	for _, z in ipairs({pos1.z - 0.5, pos2.z + 0.5}) do
+		local marker = minetest.add_entity({x=pos1.x + sizex - 0.5, y=pos1.y + sizey - 0.5, z=z}, "tubelib:region_cube")
+		if marker ~= nil then
+			marker:set_properties({
+				visual_size={x=sizex * 2, y=sizey * 2},
+				collisionbox = {-sizex, -sizey, -thickness, sizex, sizey, thickness},
+			})
+			marker:get_luaentity().player_name = name
+			table.insert(markers, marker)
+		end
+	end
+
+	--YZ plane markers
+	for _, x in ipairs({pos1.x - 0.5, pos2.x + 0.5}) do
+		local marker = minetest.add_entity({x=x, y=pos1.y + sizey - 0.5, z=pos1.z + sizez - 0.5}, "tubelib:region_cube")
+		if marker ~= nil then
+			marker:set_properties({
+				visual_size={x=sizez * 2, y=sizey * 2},
+				collisionbox = {-thickness, -sizey, -sizez, thickness, sizey, sizez},
+			})
+			marker:setyaw(math.pi / 2)
+			marker:get_luaentity().player_name = name
+			table.insert(markers, marker)
+		end
+	end
+
+	marker_region[name] = markers
+end
+
+function tubelib.switch_region(name, pos1, pos2)
+	if marker_region[name] ~= nil then --marker already exists
+		tubelib.unmark_region(name)
+	else
+		tubelib.mark_region(name, pos1, pos2)
+	end
+end
+
+minetest.register_entity(":tubelib:region_cube", {
+	initial_properties = {
+		visual = "upright_sprite",
+		visual_size = {x=1.1, y=1.1},
+		textures = {"tubelib_cube.png"},
+		use_texture_alpha = true,
+		visual_size = {x=10, y=10},
+		physical = false,
+	},
+	on_step = function(self, dtime)
+		if marker_region[self.player_name] == nil then
+			self.object:remove()
+			return
+		end
+	end,
+	on_punch = function(self, hitter)
+		tubelib.unmark_region(self.player_name)
+	end,
+})
+