Detector rail added

detector.lua

@@ -0,0 +1,74 @@
+local mesecons_rules = mesecon.rules.flat
+
+--local 
+function turnoff_detector_rail(pos)
+	local node = minetest.get_node(pos)
+	if minetest.get_item_group(node.name, "detector_rail") == 1 then
+		if node.name=="carts:detectrail_on" then --has not been dug
+			minetest.swap_node(pos, {name = "carts:detectrail", param2=node.param2})
+		end
+		mesecon.receptor_off(pos, mesecon.rules.flat)
+	end
+end
+
+function boost_cart:signal_detector_rail(pos)
+	local node = minetest.get_node(pos)
+	if minetest.get_item_group(node.name, "detector_rail") ~= 1 then
+		return
+	end
+	print("Signaling detector at " .. vector.tostr(pos))
+	if node.name == "carts:detectrail" then
+		minetest.swap_node(pos, {name = "carts:detectrail_on", param2=node.param2})
+	end
+	mesecon.receptor_on(pos, mesecon.rules.flat)
+	minetest.after(0.5, turnoff_detector_rail, pos)
+end
+
+minetest.register_node(":carts:detectrail", {
+	description = "Detector rail",
+	drawtype = "raillike",
+	tiles = {"carts_rail_dtc.png", "carts_rail_curved_dtc.png", "carts_rail_t_junction_dtc.png", "carts_rail_crossing_dtc.png"},
+	inventory_image = "carts_rail_dtc.png",
+	wield_image = "carts_rail_dtc.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	is_ground_content = true,
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	groups = {dig_immediate = 2, attached_node = 1, rail = 1, connect_to_raillike = 1, detector_rail = 1},
+	
+	mesecons = {receptor = {state = "off", rules = mesecons_rules }},
+})
+
+minetest.register_node(":carts:detectrail_on", {
+	description = "Detector rail ON (you hacker you)",
+	drawtype = "raillike",
+	tiles = {"carts_rail_dtc_on.png", "carts_rail_curved_dtc_on.png", "carts_rail_t_junction_dtc_on.png", "carts_rail_crossing_dtc_on.png"},
+	inventory_image = "carts_rail_dtc_on.png",
+	wield_image = "carts_rail_dtc_on.png",
+	paramtype = "light",
+	sunlight_propagates = true,
+	is_ground_content = true,
+	walkable = false,
+	selection_box = {
+		type = "fixed",
+		-- but how to specify the dimensions for curved and sideways rails?
+		fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
+	},
+	groups = {dig_immediate = 2, attached_node = 1, rail = 1, connect_to_raillike = 1, detector_rail = 1, not_in_creative_inventory = 1},
+	drop = "carts:detectrail",
+	
+	mesecons = {receptor = {state = "on", rules = mesecons_rules }},
+})
+
+minetest.register_craft({
+	output = "carts:detectrail 6",
+	recipe = {
+		{"default:steel_ingot", "mesecon:mesecon", "default:steel_ingot"},
+		{"default:steel_ingot", "group:stick", "default:steel_ingot"},
+		{"default:steel_ingot", "mesecon:mesecon", "default:steel_ingot"},
+	},
+})

init.lua

@@ -13,9 +13,17 @@ function vector.floor(v)
 	}
 end
 
+function vector.tostr(v)
+	return string.format("{%.3f; %.3f; %.3f}", v.x, v.y, v.z)
+end
+
 dofile(boost_cart.modpath.."/functions.lua")
 dofile(boost_cart.modpath.."/rails.lua")
 
+if mesecon then
+	dofile(boost_cart.modpath.."/detector.lua")
+end
+
 boost_cart.cart = {
 	physical = false,
 	collisionbox = {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
@@ -224,6 +232,10 @@ function boost_cart.cart:on_step(dtime)
 		new_acc = vector.multiply(dir, acc)
 	end
 	
+	if mesecon then
+		boost_cart:signal_detector_rail(vector.floor(pos))
+	end
+	
 	self.object:setacceleration(new_acc)
 	self.old_pos = vector.new(pos)
 	self.old_dir = vector.new(dir)