Allow fighters to traverse overmap ships predictably

code/game/mecha/combat/fighter.dm

@@ -9,15 +9,15 @@
 	var/ground_capable = FALSE //If we can fly over normal turfs and not just space
 
 	icon = 'icons/mecha/fighters64x64.dmi'
-	
+
 	icon_state = ""
 	initial_icon = ""
-	
+
 	step_in = 2 //Fast
 
 	health = 400
 	maxhealth = 400
-	
+
 	infra_luminosity = 6
 
 	opacity = FALSE
@@ -50,6 +50,77 @@
 	. = ..()
 	consider_gravity()
 
+//We don't get lost quite as easy.
+/obj/mecha/combat/fighter/touch_map_edge()
+	//No overmap enabled or no driver to choose
+	if(!using_map.use_overmap || !occupant || !can_ztravel())
+		return ..()
+
+	var/obj/effect/overmap/visitable/our_ship = get_overmap_sector(z)
+
+	//We're not on the overmap
+	if(!our_ship)
+		return ..()
+
+	//Stored for safety checking after user input
+	var/this_x = x
+	var/this_y = y
+	var/this_z = z
+	var/this_occupant = occupant
+
+	var/what_edge
+
+	var/new_x
+	var/new_y
+	var/new_z
+
+	if(x <= TRANSITIONEDGE)
+		what_edge = WEST
+		new_x = world.maxx - TRANSITIONEDGE - 2
+		new_y = rand(TRANSITIONEDGE + 2, world.maxy - TRANSITIONEDGE - 2)
+
+	else if (x >= (world.maxx - TRANSITIONEDGE + 1))
+		what_edge = EAST
+		new_x = TRANSITIONEDGE + 1
+		new_y = rand(TRANSITIONEDGE + 2, world.maxy - TRANSITIONEDGE - 2)
+
+	else if (y <= TRANSITIONEDGE)
+		what_edge = SOUTH
+		new_y = world.maxy - TRANSITIONEDGE -2
+		new_x = rand(TRANSITIONEDGE + 2, world.maxx - TRANSITIONEDGE - 2)
+
+	else if (y >= (world.maxy - TRANSITIONEDGE + 1))
+		what_edge = NORTH
+		new_y = TRANSITIONEDGE + 1
+		new_x = rand(TRANSITIONEDGE + 2, world.maxx - TRANSITIONEDGE - 2)
+
+	var/list/choices = list()
+	for(var/obj/effect/overmap/visitable/V in range(1, our_ship))
+		choices[V.name] = V
+
+	var/choice = input("Choose an overmap destination:", "Destination", null) as null|anything in choices
+	if(!choice)
+		var/backwards = turn(what_edge, 180)
+		forceMove(get_step(src,backwards)) //Move them back a step, then.
+		set_dir(backwards)
+		return
+	else
+		var/obj/effect/overmap/visitable/V = choices[choice]
+		if(occupant != this_occupant || this_x != x || this_y != y || this_z != z || get_dist(V,our_ship) > 1) //Sanity after user input
+			to_chat(occupant, "<span class='warning'>You or they appear to have moved!</span>")
+			return
+		var/list/levels = V.get_space_zlevels()
+		if(!levels.len)
+			to_chat(occupant, "<span class='warning'>You don't appear to be able to get there from here!</span>")
+			return
+		new_z = pick(levels)
+	var/turf/destination = locate(new_x, new_y, new_z)
+	if(!destination || destination.density)
+		to_chat(occupant, "<span class='warning'>You don't appear to be able to get there from here! Is it blocked?</span>")
+		return
+	else
+		forceMove(destination)
+
 //Modified phazon code
 /obj/mecha/combat/fighter/Topic(href, href_list)
 	..()
@@ -97,7 +168,7 @@
 
 /obj/mecha/combat/fighter/handle_equipment_movement()
 	. = ..()
-	consider_gravity(TRUE)	
+	consider_gravity(TRUE)
 
 /obj/mecha/combat/fighter/proc/start_hover()
 	if(!ion_trail.on) //We'll just use this to store if we're floating or not
@@ -162,7 +233,7 @@
 	step_in = 3 //Slightly slower than others
 
 	ground_capable = TRUE
-	
+
 	// Paint colors! Null if not set.
 	var/stripe1_color
 	var/stripe2_color

code/modules/multi-tile/multi-tile.dm

@@ -11,6 +11,8 @@
 		var/list/checked_turfs = list()
 		for(var/turf/T in locs)
 			var/turf/Tcheck = get_step(T, stepdir)
+			if(!Tcheck) //Map edge
+				continue
 			if(Tcheck in checked_turfs)
 				continue
 			if(Tcheck in locs)