Add camera

Essentially a "remote player detector", recommended uses include traffic light vehicle detection and security cameras

README

@@ -10,7 +10,7 @@ Textures WITH "adwaita" in the file name - These are icons by the GNOME Project,
 
 Depends:
 Required: digilines (base only) and mesecons (base only)
-Only needed for craft recipes: default and mesecons_luacontroller
+Only needed for craft recipes: default, mesecons_luacontroller, homedecor
 
 
 How to use digilines buttons:
@@ -34,3 +34,8 @@ Once a channel is set, any messages sent on that channel will be shown on the "L
 
 How to use the NIC:
 Send a digilines signal with the URL you want to download. The HTTPRequestResult table will be sent back on the same channel.
+
+
+How to use the camera:
+Set the channel, distance, and radius. The camera will search for a node "distance" meters away and up to 10m down.
+Every second while a player is within "radius" meters of that point, a table listing the players in range will be sent via digilines on the chosen channel.

init.lua

@@ -829,3 +829,102 @@ if http then
 		}
 	})
 end
+
+minetest.register_node("digistuff:camera", {
+	tiles = {
+		"digistuff_camera_top.png",
+		"digistuff_camera_bottom.png",
+		"digistuff_camera_right.png",
+		"digistuff_camera_left.png",
+		"digistuff_camera_back.png",
+		"digistuff_camera_front.png",
+	},
+	digiline = 
+	{
+		receptor = {}
+	},
+	groups = {cracky=2},
+	paramtype = "light",
+	paramtype2 = "facedir",
+	drawtype = "nodebox",
+	node_box = {
+		type = "fixed",
+		fixed = {
+				{-0.1,-0.5,-0.28,0.1,-0.3,0.3}, --Camera Body
+				{-0.045,-0.42,-0.34,0.045,-0.36,-0.28}, -- Lens
+				{-0.05,-0.9,-0.05,0.05,-0.5,0.05}, --Pole
+			}
+	},
+	selection_box = {
+		type = "fixed",
+		fixed = {
+				{-0.1,-0.5,-0.34,0.1,-0.3,0.3}, --Camera Body
+			}
+	},
+	description = "Digilines Camera",
+	on_construct = function(pos)
+		local meta = minetest.get_meta(pos)
+		meta:set_string("formspec","size[8,6;]field[1,1;6,2;channel;Channel;${channel}]field[1,2;6,2;radius;Radius (max 10);${radius}]field[1,3;6,2;distance;Distance (max 20);${distance}]button_exit[2.25,4;3,1;submit;Save]")
+	end,
+	on_receive_fields = function(pos, formname, fields, sender)
+		local name = sender:get_player_name()
+		if minetest.is_protected(pos,name) and not minetest.check_player_privs(name,{protection_bypass=true}) then
+			minetest.record_protection_violation(pos,name)
+			return
+		end
+		local meta = minetest.get_meta(pos)
+		if fields.channel then meta:set_string("channel",fields.channel) end
+		if fields.distance and tonumber(fields.distance) then meta:set_int("distance",math.max(math.min(20,fields.distance),0)) end
+		if fields.radius and tonumber(fields.radius) then meta:set_int("radius",math.max(math.min(10,fields.radius),1)) end
+	end,
+	sounds = default.node_sound_stone_defaults()
+})
+
+minetest.register_abm({
+	nodenames = {"digistuff:camera"},
+	interval = 1.0,
+	chance = 1,
+	action = function(pos,node)
+			local meta = minetest.get_meta(pos)
+			local channel = meta:get_string("channel")
+			local radius = meta:get_int("radius")
+			local distance = meta:get_int("distance")
+			local dir = vector.multiply(minetest.facedir_to_dir(node.param2),-1)
+			local spot = vector.add(pos,vector.multiply(dir,distance))
+			local i = 0
+			while i <= 10 and minetest.get_node(spot).name == "air" do
+				--Downward search for ground level
+				spot = vector.add(spot,vector.new(0,-1,0))
+				i = i + 1
+			end
+			if minetest.get_node(spot).name == "air" or minetest.get_node(spot).name == "ignore" then
+				--Ground not in range
+				return
+			end
+
+			local found_any = false
+			local players_found = {}
+			local objs = minetest.get_objects_inside_radius(spot,radius)
+			if objs then
+				local _,obj
+				for _,obj in ipairs(objs) do
+					if obj:is_player() then
+						table.insert(players_found,obj:get_player_name())
+						found_any = true
+					end
+				end
+				if found_any then
+					digiline:receptor_send({x=pos.x,y=pos.y-1,z=pos.z}, digiline.rules.default, channel, players_found)
+				end
+			end
+		end
+})
+
+minetest.register_craft({
+	output = "digistuff:camera",
+	recipe = {
+		{"homedecor:plastic_sheeting","homedecor:plastic_sheeting","homedecor:plastic_sheeting"},
+		{"default:glass","homedecor:ic","mesecons_luacontroller:luacontroller0000"},
+		{"homedecor:plastic_sheeting","homedecor:plastic_sheeting","homedecor:plastic_sheeting"},
+	}
+})