initial commit

description.txt

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+A node that keeps the map block it is in loaded when players are not near by.

init.lua

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+
+-- display entity shown when loader node is punched
+minetest.register_entity("simple_anchor:display", {
+	physical = false,
+	collisionbox = {0, 0, 0, 0, 0, 0},
+	visual = "wielditem",
+	-- wielditem seems to be scaled to 1.5 times original node size
+	visual_size = {x = 1.0 / 1.5, y = 1.0 / 1.5},
+	textures = {"simple_anchor:display_node"},
+	timer = 0,
+	on_step = function(self, dtime)
+		self.timer = self.timer + dtime
+		-- remove after 8 seconds
+		if self.timer > 8 then
+			self.object:remove()
+		end
+	end,
+})
+
+
+-- Display-zone node, Do NOT place the display as a node,
+-- it is made to be used as an entity (see above)
+local x = 8
+minetest.register_node("simple_anchor:display_node", {
+	tiles = {"loader_display.png"},
+	use_texture_alpha = true,
+	walkable = false,
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+			-- sides
+			{-(x+.55), -(x+.55), -(x+.55), -(x+.45), (x+.55), (x+.55)},
+			{-(x+.55), -(x+.55), (x+.45), (x+.55), (x+.55), (x+.55)},
+			{(x+.45), -(x+.55), -(x+.55), (x+.55), (x+.55), (x+.55)},
+			{-(x+.55), -(x+.55), -(x+.55), (x+.55), (x+.55), -(x+.45)},
+			-- top
+			{-(x+.55), (x+.45), -(x+.55), (x+.55), (x+.55), (x+.55)},
+			-- bottom
+			{-(x+.55), -(x+.55), -(x+.55), (x+.55), -(x+.45), (x+.55)},
+		},
+	},
+	groups = {dig_immediate = 3, not_in_creative_inventory = 1},
+	drop = "",
+})
+
+
+minetest.register_node("simple_anchor:loader_block", {
+	description = "forceload anchor",
+	tiles = {"loader_block.png"},
+	groups = {dig_immediate=2},
+	light_source = 4,
+	on_construct = function (pos)
+		if minetest.forceload_block(pos) then
+			minetest.debug("forceload block ".. minetest.pos_to_string(pos))
+			local meta = minetest.get_meta(pos)
+			local vm = minetest.get_voxel_manip(pos, pos)
+			local pmin, pmax = vm:get_emerged_area()
+			local epos = vector.divide(vector.add(pmin,pmax),2)
+			meta:set_string("epos",minetest.pos_to_string(epos))
+    else
+      minetest.debug("failed forceload block ".. minetest.pos_to_string(pos))
+    end
+	end,
+	on_destruct = function (pos)
+		minetest.forceload_free_block(pos)
+		minetest.debug("unforceloaded block ".. minetest.pos_to_string(pos))
+	end,
+	on_punch = function (pos, node, puncher, pointed_thing)
+		local meta = minetest.get_meta(pos)
+		local epos = minetest.string_to_pos(meta:get_string("epos"))
+		minetest.add_entity(epos, "simple_anchor:display")	
+	end,
+});

license.txt

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+The MIT License (MIT)
+
+Copyright (c) 2018 zing269
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.

mod.conf

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+name = simple_anchor