it's alive

code/controllers/subsystem/shuttles.dm

@@ -39,6 +39,8 @@ SUBSYSTEM_DEF(shuttle)
 	var/list/supply_packs = list()
 	var/datum/round_event/shuttle_loan/shuttle_loan
 	var/sold_atoms = ""
+	var/list/hidden_shuttle_turfs = list() //all turfs hidden from navigation computers associated with a list containing the image hiding them and the type of the turf they are pretending to be
+	var/list/hidden_shuttle_turf_images = list() //only the images from the above list
 
 /datum/controller/subsystem/shuttle/Initialize(start_timeofday)
 	ordernum = rand(1,9000)
@@ -49,7 +51,7 @@ SUBSYSTEM_DEF(shuttle)
 		WARNING("No /obj/docking_port/mobile/emergency/backup placed on the map!")
 	if(!supply)
 		WARNING("No /obj/docking_port/mobile/supply placed on the map!")
-	
+
 	initial_load()
 
 	for(var/typepath in subtypesof(/datum/supply_packs))
@@ -259,4 +261,54 @@ SUBSYSTEM_DEF(shuttle)
 
 	return O
 
+/datum/controller/subsystem/shuttle/proc/get_dock_overlap(x0, y0, x1, y1, z)
+	. = list()
+	var/list/stationary_cache = stationary
+	for(var/i in 1 to stationary_cache.len)
+		var/obj/docking_port/port = stationary_cache[i]
+		if(!port || port.z != z)
+			continue
+		var/list/bounds = port.return_coords()
+		var/list/overlap = get_overlap(x0, y0, x1, y1, bounds[1], bounds[2], bounds[3], bounds[4])
+		var/list/xs = overlap[1]
+		var/list/ys = overlap[2]
+		if(xs.len && ys.len)
+			.[port] = overlap
+
+/datum/controller/subsystem/shuttle/proc/update_hidden_docking_ports(list/remove_turfs, list/add_turfs)
+	var/list/remove_images = list()
+	var/list/add_images = list()
+
+	if(remove_turfs)
+		for(var/T in remove_turfs)
+			var/list/L = hidden_shuttle_turfs[T]
+			if(L)
+				remove_images += L[1]
+		hidden_shuttle_turfs -= remove_turfs
+
+	if(add_turfs)
+		for(var/V in add_turfs)
+			var/turf/T = V
+			var/image/I
+			if(remove_images.len)
+				//we can just reuse any images we are about to delete instead of making new ones
+				I = remove_images[1]
+				remove_images.Cut(1, 2)
+				I.loc = T
+			else
+				I = image(loc = T)
+				add_images += I
+			I.appearance = T.appearance
+			I.override = TRUE
+			hidden_shuttle_turfs[T] = list(I, T.type)
+
+	hidden_shuttle_turf_images -= remove_images
+	hidden_shuttle_turf_images += add_images
+
+	for(var/V in GLOB.navigation_computers)
+		var/obj/machinery/computer/camera_advanced/shuttle_docker/C = V
+		C.update_hidden_docking_ports(remove_images, add_images)
+
+	QDEL_LIST(remove_images)
+
 #undef CALL_SHUTTLE_REASON_LENGTH