Add digilines rail

README

@@ -27,3 +27,15 @@ This mod adds several types of rails for use with the existing carts from minete
 -- When not powered, causes any carts passing over it to come to an immediate stop.
 -- When powered via mesecons while the cart is still stopped on it, causes the cart to resume moving with its previous speed.
 -- If left powered, acts as a normal rail.
+
+* Digilines Controlled Rail (available only if digilines is installed)
+-- Sends a table on its set channel when passed over by a cart, including the following elements:
+---- pos: Exact position of the cart
+---- velocity: X and Z velocity of the cart
+---- driver: Name of the player inside the cart (nil if none)
+-- Responds to the following commands on its set channel:
+---- "grab": Stops a cart traveling over the rail, same as the start-stop rail. Only does anything if a cart is present when the command is issued.
+---- "release": Restarts a cart stopped via the "grab" command, causing it to resume moving with its previous speed.
+---- "power1" through "power15": Causes the rail to act as a powered rail. The power of a normal powered rail is 5.
+---- "brake1" through "brake15": Causes the rail to act as a brake rail. The power of a normal brake rail is 5.
+---- "idle" (also "power0" or "brake0"): Causes the rail to act as a normal rail, applying no power or braking force.

init.lua

@@ -360,3 +360,201 @@ minetest.register_craft({
 		{"carts:rail","default:sand","",},
 	},
 })
+
+if minetest.get_modpath("digilines") then
+	local digilines_rules = {
+		{x =  1,y =  0,z =  0,},
+		{x = -1,y =  0,z =  0,},
+		{x =  0,y =  0,z =  1,},
+		{x =  0,y =  0,z = -1,},
+		{x =  1,y = -1,z =  0,},
+		{x = -1,y = -1,z =  0,},
+		{x =  0,y = -1,z =  1,},
+		{x =  0,y = -1,z = -1,},
+		{x =  1,y =  1,z =  0,},
+		{x = -1,y =  1,z =  0,},
+		{x =  0,y =  1,z =  1,},
+		{x =  0,y =  1,z = -1,},
+		{x =  0,y = -1,z =  0,},
+		{x =  0,y =  1,z =  0,},
+	}
+	
+	local function digilinesrail_onstep(cart,dtime)
+		local cartpos = cart.object:get_pos()
+		local trackpos = {}
+		trackpos.x = math.floor(cartpos.x + 0.5)
+		trackpos.y = math.floor(cartpos.y + 0.5)
+		trackpos.z = math.floor(cartpos.z + 0.5)
+		local track = minetest.get_node(trackpos)
+		if not string.find(track.name,"mesecons_carts:digilines_rail") then return end
+		local trackmeta = minetest.get_meta(trackpos)
+		local response = {}
+		local velocity = cart.object:get_velocity()
+		response.pos = {x = cartpos.x,y = cartpos.y,z = cartpos.z,}
+		response.velocity = {x = velocity.x,z = velocity.z,}
+		response.driver = cart.driver
+		digiline:receptor_send(trackpos,digilines_rules,trackmeta:get_string("channel"),response)
+	end
+	
+	local function digilinesrail_handle_digilines(pos,node,channel,msg)
+		local trackmeta = minetest.get_meta(pos)
+		if channel ~= trackmeta:get_string("channel") then return end
+		if msg == "grab" then
+			local possible_carts = minetest.get_objects_inside_radius(pos,1)
+			for _,object in pairs(possible_carts) do
+				local cart = object:get_luaentity()
+				if cart and cart.name == "carts:cart" then
+					local velocity = cart.object:get_velocity()
+					trackmeta:set_string("velocity",minetest.serialize(velocity))
+					cart.object:set_velocity(vector.new(0,0,0))
+					cart.object:set_pos(pos)
+				end
+			end
+		elseif msg == "release" then
+			local velocity = trackmeta:get_string("velocity")
+			if velocity then velocity = minetest.deserialize(velocity) end
+			if not velocity then return end
+			local possible_carts = minetest.get_objects_inside_radius(pos,1)
+			for _,object in pairs(possible_carts) do
+				local cart = object:get_luaentity()
+				if cart and cart.name == "carts:cart" then
+					cart.object:set_velocity(velocity)
+				end
+			end
+		elseif msg == "idle" or msg == "power0" or msg == "brake0" then
+			minetest.swap_node(pos,{name = "mesecons_carts:digilines_rail_idle",})
+		elseif type(msg) == "string" then
+			if string.sub(msg,1,5) == "power" then
+				local strength = string.sub(msg,6,-1)
+				if strength then strength = tonumber(strength) end
+				if not strength then return end
+				strength = math.min(15,math.max(1,math.floor(strength)))
+				local newnode = "mesecons_carts:digilines_rail_pwr_"..strength
+				minetest.swap_node(pos,{name = newnode,})
+			elseif string.sub(msg,1,5) == "brake" then
+				local strength = string.sub(msg,6,-1)
+				if strength then strength = tonumber(strength) end
+				if not strength then return end
+				strength = math.min(15,math.max(1,math.floor(strength)))
+				local newnode = "mesecons_carts:digilines_rail_brk_"..strength
+				minetest.swap_node(pos,{name = newnode,})
+			end
+		end
+	end
+	
+	carts:register_rail("mesecons_carts:digilines_rail_idle", {
+		description = "Digilines-Controlled Rail",
+		tiles = {
+			"mesecons_carts_digi_straight.png",
+			"mesecons_carts_digi_curve.png",
+			"mesecons_carts_digi_tjunction.png",
+			"mesecons_carts_digi_crossing.png",
+		},
+		after_place_node = function(pos)
+			local meta = minetest.get_meta(pos)
+			meta:set_string("formspec","field[channel;Channel;${channel}")
+			meta:set_string("channel","")
+			meta:set_string("velocity",minetest.serialize(vector.new(0,0,0)))
+		end,
+		on_receive_fields = function(pos, formname, fields, sender)
+			if not fields.channel then return end
+			local name = sender:get_player_name()
+			if minetest.is_protected(pos,name) and not minetest.check_player_privs(name,{protection_bypass=true}) then
+				minetest.record_protection_violation(pos,name)
+				return
+			end
+			minetest.get_meta(pos):set_string("channel",fields.channel)
+		end,
+		digiline = {
+			wire = {
+				rules = digilines_rules,
+			},
+			receptor = {},
+			effector = {
+				action = digilinesrail_handle_digilines,
+			},
+		},
+		groups = carts:get_rail_groups(),
+	}, {on_step = digilinesrail_onstep,})
+	
+	for i=1,15,1 do
+		carts:register_rail("mesecons_carts:digilines_rail_pwr_"..i, {
+			description = string.format("Digilines-Controlled Rail (powered, strength %d - you hacker you!)",i),
+			tiles = {
+				"mesecons_carts_digi_straight.png",
+				"mesecons_carts_digi_curve.png",
+				"mesecons_carts_digi_tjunction.png",
+				"mesecons_carts_digi_crossing.png",
+			},
+			drop = "mesecons_carts:digilines_rail_idle",
+			after_place_node = function(pos)
+				local meta = minetest.get_meta(pos)
+				meta:set_string("formspec","field[channel;Channel;${channel}")
+				meta:set_string("channel","")
+				meta:set_string("velocity",minetest.serialize(vector.new(0,0,0)))
+			end,
+			on_receive_fields = function(pos, formname, fields, sender)
+				if not fields.channel then return end
+				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
+				minetest.get_meta(pos):set_string("channel",fields.channel)
+			end,
+			digiline = {
+				wire = {
+					rules = digilines_rules,
+				},
+				receptor = {},
+				effector = {
+					action = digilinesrail_handle_digilines,
+				},
+			},
+			groups = carts:get_rail_groups({not_in_creative_inventory = 1,}),
+		}, {on_step = digilinesrail_onstep,acceleration = i,})
+		carts:register_rail("mesecons_carts:digilines_rail_brk_"..i, {
+			description = string.format("Digilines-Controlled Rail (brake, strength %d - you hacker you!)",i),
+			tiles = {
+				"mesecons_carts_digi_straight.png",
+				"mesecons_carts_digi_curve.png",
+				"mesecons_carts_digi_tjunction.png",
+				"mesecons_carts_digi_crossing.png",
+			},
+			drop = "mesecons_carts:digilines_rail_idle",
+			after_place_node = function(pos)
+				local meta = minetest.get_meta(pos)
+				meta:set_string("formspec","field[channel;Channel;${channel}")
+				meta:set_string("channel","")
+				meta:set_string("velocity",minetest.serialize(vector.new(0,0,0)))
+			end,
+			on_receive_fields = function(pos, formname, fields, sender)
+				if not fields.channel then return end
+				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
+				minetest.get_meta(pos):set_string("channel",fields.channel)
+			end,
+			digiline = {
+				wire = {
+					rules = digilines_rules,
+				},
+				receptor = {},
+				effector = {
+					action = digilinesrail_handle_digilines,
+				},
+			},
+			groups = carts:get_rail_groups({not_in_creative_inventory = 1,}),
+		}, {on_step = digilinesrail_onstep,acceleration = i*-1,})
+	end
+	minetest.register_craft({
+		output = "mesecons_carts:digilines_rail_idle 3",
+		recipe = {
+			{"carts:rail","basic_materials:motor","",},
+			{"carts:rail","mesecons_luacontroller:luacontroller0000","digilines:wire_std_00000000",},
+			{"carts:rail","default:sand","",},
+		},
+	})
+end

mod.conf

@@ -1,3 +1,4 @@
 name = mesecons_carts
 description = Mesecons Carts Integration
 depends = carts,mesecons
+optional_depends = digilines