Adds Multi-Z Test Map

code/datums/observation/turf_changed.dm

@@ -0,0 +1,28 @@
+//	Observer Pattern Implementation: Turf Changed
+//		Registration type: /turf
+//
+//		Raised when: A turf has been changed using the ChangeTurf proc.
+//
+//		Arguments that the called proc should expect:
+//			/turf/affected:  The turf that has changed
+//			/old_density: Density before the change
+//			/new_density: Density after the change
+//			/old_opacity: Opacity before the change
+//			/new_opacity: Opacity after the change
+
+var/decl/observ/turf_changed/turf_changed_event = new()
+
+/decl/observ/turf_changed
+	name = "Turf Changed"
+	expected_type = /turf
+
+/************************
+* Turf Changed Handling *
+************************/
+
+/turf/ChangeTurf()
+	var/old_density = density
+	var/old_opacity = opacity
+	. = ..()
+	if(.)
+		turf_changed_event.raise_event(src, old_density, density, old_opacity, opacity)

code/game/machinery/CableLayer.dm

@@ -73,7 +73,7 @@
 		visible_message("A red light flashes on \the [src].")
 		return
 	cable.use(amount)
-	if(deleted(cable)) 
+	if(deleted(cable))
 		cable = null
 	return 1
 
@@ -104,13 +104,13 @@
 	NC.cableColor("red")
 	NC.d1 = 0
 	NC.d2 = fdirn
-	NC.updateicon()
+	NC.update_icon()
 
 	var/datum/powernet/PN
 	if(last_piece && last_piece.d2 != M_Dir)
 		last_piece.d1 = min(last_piece.d2, M_Dir)
 		last_piece.d2 = max(last_piece.d2, M_Dir)
-		last_piece.updateicon()
+		last_piece.update_icon()
 		PN = last_piece.powernet
 
 	if(!PN)

code/game/mecha/equipment/tools/medical_tools.dm

@@ -348,13 +348,13 @@
 		NC.cableColor("red")
 		NC.d1 = 0
 		NC.d2 = fdirn
-		NC.updateicon()
+		NC.update_icon()
 
 		var/datum/powernet/PN
 		if(last_piece && last_piece.d2 != chassis.dir)
 			last_piece.d1 = min(last_piece.d2, chassis.dir)
 			last_piece.d2 = max(last_piece.d2, chassis.dir)
-			last_piece.updateicon()
+			last_piece.update_icon()
 			PN = last_piece.powernet
 
 		if(!PN)

code/game/objects/effects/effect_system.dm

@@ -333,7 +333,7 @@ steam.start() -- spawns the effect
 			spawn(0)
 				var/turf/T = get_turf(src.holder)
 				if(T != src.oldposition)
-					if(istype(T, /turf/space))
+					if(istype(T, /turf/simulated))
 						var/obj/effect/effect/ion_trails/I = PoolOrNew(/obj/effect/effect/ion_trails, src.oldposition)
 						src.oldposition = T
 						I.set_dir(src.holder.dir)

code/game/objects/structures/lattice.dm

@@ -34,6 +34,11 @@
 		if(locate(/obj/structure/lattice, get_step(src, dir)))
 			L = locate(/obj/structure/lattice, get_step(src, dir))
 			L.updateOverlays(src.loc)
+	if(istype(loc, /turf/simulated/open))
+		var/turf/simulated/open/O = loc
+		spawn(1)
+			if(O) // If we built a new floor with the lattice, the open turf won't exist anymore.
+				O.update() // This lattice may be supporting things on top of it.  If it's being deleted, they need to fall down.
 	..()
 
 /obj/structure/lattice/ex_act(severity)

code/game/turfs/turf_changing.dm

@@ -9,6 +9,13 @@
 	if(L)
 		qdel(L)
 
+// Called after turf replaces old one
+/turf/proc/post_change()
+	levelupdate()
+	var/turf/simulated/open/T = GetAbove(src)
+	if(istype(T))
+		T.update_icon()
+
 //Creates a new turf
 /turf/proc/ChangeTurf(var/turf/N, var/tell_universe=1, var/force_lighting_update = 0)
 	if (!N)
@@ -60,6 +67,7 @@
 
 		W.levelupdate()
 		W.update_icon(1)
+		W.post_change()
 		. = W
 
 	else
@@ -83,6 +91,7 @@
 
 		W.levelupdate()
 		W.update_icon(1)
+		W.post_change()
 		. =  W
 
 	lighting_overlay = old_lighting_overlay

code/modules/admin/verbs/buildmode.dm

@@ -392,11 +392,12 @@
 
 			if(holder.buildmode.coordA && holder.buildmode.coordB)
 				user << "<span class='notice'>Ladder locations set, building ladders.</span>"
-				var/obj/structure/ladder/A = new /obj/structure/ladder(holder.buildmode.coordA)
+				var/obj/structure/ladder/A = new /obj/structure/ladder/up(holder.buildmode.coordA)
 				var/obj/structure/ladder/B = new /obj/structure/ladder(holder.buildmode.coordB)
-				A.target = B
-				B.target = A
-				B.icon_state = "ladderup"
+				A.target_up = B
+				B.target_down = A
+				A.update_icon()
+				B.update_icon()
 				holder.buildmode.coordA = null
 				holder.buildmode.coordB = null
 		if(7) // Move into contents

code/modules/multiz/movement.dm

@@ -1,51 +1,194 @@
-/obj/item/weapon/tank/jetpack/verb/moveup()
+/mob/verb/up()
 	set name = "Move Upwards"
-	set category = "Object"
+	set category = "IC"
 
-	. = 1
-	if(!allow_thrust(0.01, usr))
-		usr << "<span class='warning'>\The [src] is disabled.</span>"
+	if(zMove(UP))
+		to_chat(usr, "<span class='notice'>You move upwards.</span>")
+
+/mob/verb/down()
+	set name = "Move Down"
+	set category = "IC"
+
+	if(zMove(DOWN))
+		to_chat(usr, "<span class='notice'>You move down.</span>")
+
+/mob/proc/zMove(direction)
+	if(eyeobj)
+		return eyeobj.zMove(direction)
+	if(!can_ztravel())
+		to_chat(usr, "<span class='warning'>You lack means of travel in that direction.</span>")
 		return
 
-	var/turf/above = GetAbove(src)
-	if(!istype(above))
-		usr << "<span class='notice'>There is nothing of interest in this direction.</span>"
-		return
+	var/turf/destination = (direction == UP) ? GetAbove(src) : GetBelow(src)
 
-	if(!istype(above, /turf/space) && !istype(above, /turf/simulated/open))
-		usr << "<span class='warning'>You bump against \the [above].</span>"
-		return
+	if(!destination)
+		to_chat(usr, "<span class='notice'>There is nothing of interest in this direction.</span>")
+		return 0
 
-	for(var/atom/A in above)
-		if(A.density)
-			usr << "<span class='warning'>\The [A] blocks you.</span>"
-			return
+	var/turf/start = get_turf(src)
+	if(!start.CanZPass(src, direction))
+		to_chat(usr, "<span class='warning'>\The [start] is in the way.</span>")
+		return 0
+	if(!destination.CanZPass(src, direction))
+		to_chat(usr, "<span class='warning'>\The [destination] blocks your way.</span>")
+		return 0
 
-	usr.Move(above)
-	usr << "<span class='notice'>You move upwards.</span>"
+	var/area/area = get_area(src)
+	if(direction == UP && area.has_gravity)
+		var/obj/structure/lattice/lattice = locate() in destination.contents
+		if(lattice)
+			var/pull_up_time = max(5 SECONDS + (src.movement_delay() * 10), 1)
+			to_chat(src, "<span class='notice'>You grab \the [lattice] and start pulling yourself upward...</span>")
+			destination.audible_message("<span class='notice'>You hear something climbing up \the [lattice].</span>")
+			if(do_after(src, pull_up_time))
+				to_chat(src, "<span class='notice'>You pull yourself up.</span>")
+			else
+				to_chat(src, "<span class='warning'>You gave up on pulling yourself up.</span>")
+				return 0
+		else
+			to_chat(usr, "<span class='warning'>Gravity stops you from moving upward.</span>")
+			return 0
 
-/obj/item/weapon/tank/jetpack/verb/movedown()
-	set name = "Move Downwards"
-	set category = "Object"
+	for(var/atom/A in destination)
+		if(!A.CanPass(src, start, 1.5, 0))
+			to_chat(usr, "<span class='warning'>\The [A] blocks you.</span>")
+			return 0
+	Move(destination)
+	return 1
 
-	. = 1
-	if(!allow_thrust(0.01, usr))
-		usr << "<span class='warning'>\The [src] is disabled.</span>"
+/mob/observer/zMove(direction)
+	var/turf/destination = (direction == UP) ? GetAbove(src) : GetBelow(src)
+	if(destination)
+		forceMove(destination)
+	else
+		to_chat(usr, "<span class='notice'>There is nothing of interest in this direction.</span>")
+
+/mob/observer/eye/zMove(direction)
+	var/turf/destination = (direction == UP) ? GetAbove(src) : GetBelow(src)
+	if(destination)
+		setLoc(destination)
+	else
+		to_chat(usr, "<span class='notice'>There is nothing of interest in this direction.</span>")
+
+/mob/proc/can_ztravel()
+	return 0
+
+/mob/observer/can_ztravel()
+	return 1
+
+/mob/living/carbon/human/can_ztravel()
+	if(incapacitated())
+		return 0
+
+	if(Process_Spacemove())
+		return 1
+
+	if(Check_Shoegrip())	//scaling hull with magboots
+		for(var/turf/simulated/T in trange(1,src))
+			if(T.density)
+				return 1
+
+/mob/living/silicon/robot/can_ztravel()
+	if(incapacitated() || is_dead())
+		return 0
+
+	if(Process_Spacemove()) //Checks for active jetpack
+		return 1
+
+	for(var/turf/simulated/T in trange(1,src)) //Robots get "magboots"
+		if(T.density)
+			return 1
+
+
+
+
+//FALLING STUFF
+
+//Holds fall checks that should not be overriden by children
+/atom/movable/proc/fall()
+	if(!isturf(loc))
 		return
 
 	var/turf/below = GetBelow(src)
-	if(!istype(below))
-		usr << "<span class='notice'>There is nothing of interest in this direction.</span>"
+	if(!below)
 		return
 
-	if(below.density)
-		usr << "<span class='warning'>You bump against \the [below].</span>"
+	var/turf/T = loc
+	if(!T.CanZPass(src, DOWN) || !below.CanZPass(src, DOWN))
 		return
 
+	// No gravity in space, apparently.
+	var/area/area = get_area(src)
+	if(!area.has_gravity())
+		return
+
+	if(throwing)
+		return
+
+	if(can_fall())
+		handle_fall(below)
+
+//For children to override
+/atom/movable/proc/can_fall()
+	if(anchored)
+		return FALSE
+
+	if(locate(/obj/structure/lattice, loc))
+		return FALSE
+
+	// See if something prevents us from falling.
+	var/turf/below = GetBelow(src)
 	for(var/atom/A in below)
-		if(A.density)
-			usr << "<span class='warning'>\The [A] blocks you.</span>"
-			return
+		if(!A.CanPass(src, src.loc))
+			return FALSE
 
-	usr.Move(below)
-	usr << "<span class='notice'>You move downwards.</span>"
+	return TRUE
+
+/obj/effect/can_fall()
+	return FALSE
+
+/obj/effect/decal/cleanable/can_fall()
+	return TRUE
+
+/obj/item/pipe/can_fall()
+	var/turf/simulated/open/below = loc
+	below = below.below
+
+	. = ..()
+
+	if(anchored)
+		return FALSE
+
+	if((locate(/obj/structure/disposalpipe/up) in below) || locate(/obj/machinery/atmospherics/pipe/zpipe/up in below))
+		return FALSE
+
+/mob/living/simple_animal/parrot/can_fall() // Poly can fly.
+	return FALSE
+
+/mob/living/simple_animal/hostile/carp/can_fall() // So can carp apparently.
+	return FALSE
+
+/atom/movable/proc/handle_fall(var/turf/landing)
+	Move(landing)
+	if(locate(/obj/structure/stairs) in landing)
+		return 1
+
+	if(istype(landing, /turf/simulated/open))
+		visible_message("\The [src] falls from the deck above through \the [landing]!", "You hear a whoosh of displaced air.")
+	else
+		visible_message("\The [src] falls from the deck above and slams into \the [landing]!", "You hear something slam into the deck.")
+
+/mob/living/carbon/human/handle_fall(var/turf/landing)
+	if(..())
+		return
+	to_chat(src, "<span class='danger'>You fall off and hit \the [landing]!</span>")
+	playsound(loc, "punch", 25, 1, -1)
+	var/damage = 20 // Because wounds heal rather quickly, 20 should be enough to discourage jumping off but not be enough to ruin you, at least for the first time.
+	apply_damage(rand(0, damage), BRUTE, BP_HEAD)
+	apply_damage(rand(0, damage), BRUTE, BP_TORSO)
+	apply_damage(rand(0, damage), BRUTE, BP_L_LEG)
+	apply_damage(rand(0, damage), BRUTE, BP_R_LEG)
+	apply_damage(rand(0, damage), BRUTE, BP_L_ARM)
+	apply_damage(rand(0, damage), BRUTE, BP_R_ARM)
+	Weaken(4)
+	updatehealth()

code/modules/multiz/structures.dm

@@ -4,54 +4,127 @@
 
 /obj/structure/ladder
 	name = "ladder"
-	desc = "A ladder.  You can climb it up and down."
-	icon_state = "ladderdown"
+	desc = "A ladder. You can climb it up and down."
+	icon_state = "ladder01"
 	icon = 'icons/obj/structures.dmi'
 	density = 0
 	opacity = 0
 	anchored = 1
 
-	var/obj/structure/ladder/target
+	var/allowed_directions = DOWN
+	var/obj/structure/ladder/target_up
+	var/obj/structure/ladder/target_down
 
-	initialize()
-		// the upper will connect to the lower
-		if(icon_state == "ladderup")
-			return
+	var/const/climb_time = 2 SECONDS
 
+/obj/structure/ladder/initialize()
+	// the upper will connect to the lower
+	if(allowed_directions & DOWN) //we only want to do the top one, as it will initialize the ones before it.
 		for(var/obj/structure/ladder/L in GetBelow(src))
-			if(L.icon_state == "ladderup")
-				target = L
-				L.target = src
+			if(L.allowed_directions & UP)
+				target_down = L
+				L.target_up = src
 				return
+	update_icon()
 
-	Destroy()
-		if(target && icon_state == "ladderdown")
-			qdel(target)
-		return ..()
+/obj/structure/ladder/Destroy()
+	if(target_down)
+		target_down.target_up = null
+		target_down = null
+	if(target_up)
+		target_up.target_down = null
+		target_up = null
+	return ..()
 
-	attackby(obj/item/C as obj, mob/user as mob)
-		. = ..()
-		attack_hand(user)
+/obj/structure/ladder/attackby(obj/item/C as obj, mob/user as mob)
+	attack_hand(user)
+	return
+
+/obj/structure/ladder/attack_hand(var/mob/M)
+	if(!M.may_climb_ladders(src))
 		return
 
-	attack_hand(var/mob/M)
-		if(!target || !istype(target.loc, /turf))
-			M << "<span class='notice'>\The [src] is incomplete and can't be climbed.</span>"
+	var/obj/structure/ladder/target_ladder = getTargetLadder(M)
+	if(!target_ladder)
+		return
+	if(!M.Move(get_turf(src)))
+		to_chat(M, "<span class='notice'>You fail to reach \the [src].</span>")
+		return
+
+	var/direction = target_ladder == target_up ? "up" : "down"
+
+	M.visible_message("<span class='notice'>\The [M] begins climbing [direction] \the [src]!</span>",
+	"You begin climbing [direction] \the [src]!",
+	"You hear the grunting and clanging of a metal ladder being used.")
+
+	target_ladder.audible_message("<span class='notice'>You hear something coming [direction] \the [src]</span>")
+
+	if(do_after(M, climb_time, src))
+		climbLadder(M, target_ladder)
+
+/obj/structure/ladder/attack_ghost(var/mob/M)
+	var/target_ladder = getTargetLadder(M)
+	if(target_ladder)
+		M.forceMove(get_turf(target_ladder))
+
+/obj/structure/ladder/proc/getTargetLadder(var/mob/M)
+	if((!target_up && !target_down) || (target_up && !istype(target_up.loc, /turf) || (target_down && !istype(target_down.loc,/turf))))
+		to_chat(M, "<span class='notice'>\The [src] is incomplete and can't be climbed.</span>")
+		return
+	if(target_down && target_up)
+		var/direction = alert(M,"Do you want to go up or down?", "Ladder", "Up", "Down", "Cancel")
+
+		if(direction == "Cancel")
 			return
 
-		var/turf/T = target.loc
-		for(var/atom/A in T)
-			if(A.density)
-				M << "<span class='notice'>\A [A] is blocking \the [src].</span>"
-				return
+		if(!M.may_climb_ladders(src))
+			return
+
+		switch(direction)
+			if("Up")
+				return target_up
+			if("Down")
+				return target_down
+	else
+		return target_down || target_up
+
+/mob/proc/may_climb_ladders(var/ladder)
+	if(!Adjacent(ladder))
+		to_chat(src, "<span class='warning'>You need to be next to \the [ladder] to start climbing.</span>")
+		return FALSE
+	if(incapacitated())
+		to_chat(src, "<span class='warning'>You are physically unable to climb \the [ladder].</span>")
+		return FALSE
+	return TRUE
+
+/mob/observer/ghost/may_climb_ladders(var/ladder)
+	return TRUE
+
+/obj/structure/ladder/proc/climbLadder(var/mob/M, var/target_ladder)
+	var/turf/T = get_turf(target_ladder)
+	for(var/atom/A in T)
+		if(!A.CanPass(M, M.loc, 1.5, 0))
+			to_chat(M, "<span class='notice'>\The [A] is blocking \the [src].</span>")
+			return FALSE
+	return M.Move(T)
+
+/obj/structure/ladder/CanPass(obj/mover, turf/source, height, airflow)
+	return airflow || !density
+
+/obj/structure/ladder/update_icon()
+	icon_state = "ladder[!!(allowed_directions & UP)][!!(allowed_directions & DOWN)]"
+
+/obj/structure/ladder/up
+	allowed_directions = UP
+	icon_state = "ladder10"
+
+/obj/structure/ladder/updown
+	allowed_directions = UP|DOWN
+	icon_state = "ladder11"
+
+
 
-		M.visible_message("<span class='notice'>\A [M] climbs [icon_state == "ladderup" ? "up" : "down"] \a [src]!</span>",
-			"You climb [icon_state == "ladderup"  ? "up" : "down"] \the [src]!",
-			"You hear the grunting and clanging of a metal ladder being used.")
-		M.Move(T)
 
-	CanPass(obj/mover, turf/source, height, airflow)
-		return airflow || !density
 
 /obj/structure/stairs
 	name = "Stairs"
@@ -61,46 +134,50 @@
 	opacity = 0
 	anchored = 1
 
-	initialize()
-		for(var/turf/turf in locs)
-			var/turf/simulated/open/above = GetAbove(turf)
-			if(!above)
-				warning("Stair created without level above: ([loc.x], [loc.y], [loc.z])")
-				return qdel(src)
-			if(!istype(above))
-				above.ChangeTurf(/turf/simulated/open)
+/obj/structure/stairs/initialize()
+	for(var/turf/turf in locs)
+		var/turf/simulated/open/above = GetAbove(turf)
+		if(!above)
+			warning("Stair created without level above: ([loc.x], [loc.y], [loc.z])")
+			return qdel(src)
+		if(!istype(above))
+			above.ChangeTurf(/turf/simulated/open)
 
-	Uncross(atom/movable/A)
-		if(A.dir == dir)
-			// This is hackish but whatever.
-			var/turf/target = get_step(GetAbove(A), dir)
-			var/turf/source = A.loc
-			if(target.Enter(A, source))
-				A.loc = target
-				target.Entered(A, source)
-			return 0
-		return 1
+/obj/structure/stairs/Uncross(atom/movable/A)
+	if(A.dir == dir)
+		// This is hackish but whatever.
+		var/turf/target = get_step(GetAbove(A), dir)
+		var/turf/source = A.loc
+		if(target.Enter(A, source))
+			A.loc = target
+			target.Entered(A, source)
+			if(isliving(A))
+				var/mob/living/L = A
+				if(L.pulling)
+					L.pulling.forceMove(target)
+		return 0
+	return 1
 
-	CanPass(obj/mover, turf/source, height, airflow)
-		return airflow || !density
+/obj/structure/stairs/CanPass(obj/mover, turf/source, height, airflow)
+	return airflow || !density
 
-	// type paths to make mapping easier.
-	north
-		dir = NORTH
-		bound_height = 64
-		bound_y = -32
-		pixel_y = -32
+// type paths to make mapping easier.
+/obj/structure/stairs/north
+	dir = NORTH
+	bound_height = 64
+	bound_y = -32
+	pixel_y = -32
 
-	south
-		dir = SOUTH
-		bound_height = 64
+/obj/structure/stairs/south
+	dir = SOUTH
+	bound_height = 64
 
-	east
-		dir = EAST
-		bound_width = 64
-		bound_x = -32
-		pixel_x = -32
+/obj/structure/stairs/east
+	dir = EAST
+	bound_width = 64
+	bound_x = -32
+	pixel_x = -32
 
-	west
-		dir = WEST
-		bound_width = 64
+/obj/structure/stairs/west
+	dir = WEST
+	bound_width = 64

code/modules/multiz/turf.dm

@@ -1,87 +1,79 @@
+/turf/proc/CanZPass(atom/A, direction)
+	if(z == A.z) //moving FROM this turf
+		return direction == UP //can't go below
+	else
+		if(direction == UP) //on a turf below, trying to enter
+			return 0
+		if(direction == DOWN) //on a turf above, trying to enter
+			return !density
+
+/turf/simulated/open/CanZPass(atom, direction)
+	return 1
+
+/turf/space/CanZPass(atom, direction)
+	return 1
+
 /turf/simulated/open
 	name = "open space"
 	icon = 'icons/turf/space.dmi'
-	icon_state = "black"
-	alpha = 16
+	icon_state = ""
 	layer = 0
 	density = 0
 	pathweight = 100000 //Seriously, don't try and path over this one numbnuts
 
 	var/turf/below
-	var/list/underlay_references
-	var/global/overlay_map = list()
+
+/turf/simulated/open/post_change()
+	..()
+	update()
 
 /turf/simulated/open/initialize()
 	..()
-	below = GetBelow(src)
 	ASSERT(HasBelow(z))
+	update()
 
 /turf/simulated/open/Entered(var/atom/movable/mover)
-	// only fall down in defined areas (read: areas with artificial gravitiy)
-	if(!istype(below)) //make sure that there is actually something below
-		below = GetBelow(src)
-		if(!below)
-			return
+	..()
+	mover.fall()
 
-	// No gravity in space, apparently.
-	var/area/area = get_area(src)
-	if(area.name == "Space")
-		return
-
-	// Prevent pipes from falling into the void... if there is a pipe to support it.
-	if(mover.anchored || istype(mover, /obj/item/pipe) && \
-		(locate(/obj/structure/disposalpipe/up) in below) || \
-		 locate(/obj/machinery/atmospherics/pipe/zpipe/up in below))
-		return
-
-	// See if something prevents us from falling.
-	var/soft = 0
-	for(var/atom/A in below)
-		if(A.density)
-			if(!istype(A, /obj/structure/window))
-				return
-			else
-				var/obj/structure/window/W = A
-				if(W.is_fulltile())
-					return
-		// Dont break here, since we still need to be sure that it isnt blocked
-		if(istype(A, /obj/structure/stairs))
-			soft = 1
-
-	// We've made sure we can move, now.
-	mover.Move(below)
-
-	if(!soft)
-		if(!istype(mover, /mob))
-			if(istype(below, /turf/simulated/open))
-				mover.visible_message("\The [mover] falls from the deck above through \the [below]!", "You hear a whoosh of displaced air.")
-			else
-				mover.visible_message("\The [mover] falls from the deck above and slams into \the [below]!", "You hear something slam into the deck.")
-		else
-			var/mob/M = mover
-			if(istype(below, /turf/simulated/open))
-				below.visible_message("\The [mover] falls from the deck above through \the [below]!", "You hear a soft whoosh.[M.stat ? "" : ".. and some screaming."]")
-			else
-				M.visible_message("\The [mover] falls from the deck above and slams into \the [below]!", "You land on \the [below].", "You hear a soft whoosh and a crunch")
-
-			// Handle people getting hurt, it's funny!
-			if (istype(mover, /mob/living/carbon/human))
-				var/mob/living/carbon/human/H = mover
-				var/damage = 5
-				H.apply_damage(rand(0, damage), BRUTE, BP_HEAD)
-				H.apply_damage(rand(0, damage), BRUTE, BP_TORSO)
-				H.apply_damage(rand(0, damage), BRUTE, BP_L_LEG)
-				H.apply_damage(rand(0, damage), BRUTE, BP_R_LEG)
-				H.apply_damage(rand(0, damage), BRUTE, BP_L_ARM)
-				H.apply_damage(rand(0, damage), BRUTE, BP_R_ARM)
-				H.weakened = max(H.weakened,2)
-				H.updatehealth()
+/turf/simulated/open/proc/update()
+	below = GetBelow(src)
+	turf_changed_event.register(below, src, /turf/simulated/open/update_icon)
+	var/turf/simulated/T = get_step(src,NORTH)
+	if(T)
+		turf_changed_event.register(T, src, /turf/simulated/open/update_icon)
+	levelupdate()
+	for(var/atom/movable/A in src)
+		A.fall()
+	update_icon()
 
 // override to make sure nothing is hidden
 /turf/simulated/open/levelupdate()
 	for(var/obj/O in src)
 		O.hide(0)
 
+/turf/simulated/open/update_icon()
+	if(below)
+		underlays = list(image(icon = below.icon, icon_state = below.icon_state))
+		underlays += below.overlays.Copy()
+
+	var/list/noverlays = list()
+	if(!istype(below,/turf/space))
+		noverlays += image(icon =icon, icon_state = "empty", layer = 2.2)
+
+	var/turf/simulated/T = get_step(src,NORTH)
+	if(istype(T) && !istype(T,/turf/simulated/open))
+		noverlays += image(icon ='icons/turf/cliff.dmi', icon_state = "metal", layer = 2.2)
+
+	var/obj/structure/stairs/S = locate() in below
+	if(S && S.loc == below)
+		var/image/I = image(icon = S.icon, icon_state = "below", dir = S.dir, layer = 2.2)
+		I.pixel_x = S.pixel_x
+		I.pixel_y = S.pixel_y
+		noverlays += I
+
+	overlays = noverlays
+
 // Straight copy from space.
 /turf/simulated/open/attackby(obj/item/C as obj, mob/user as mob)
 	if (istype(C, /obj/item/stack/rods))
@@ -108,4 +100,14 @@
 			return
 		else
 			user << "<span class='warning'>The plating is going to need some support.</span>"
-	return
+
+	//To lay cable.
+	if(istype(C, /obj/item/stack/cable_coil))
+		var/obj/item/stack/cable_coil/coil = C
+		coil.turf_place(src, user)
+		return
+	return
+
+//Most things use is_plating to test if there is a cover tile on top (like regular floors)
+/turf/simulated/open/is_plating()
+	return 1

code/modules/power/cable.dm

@@ -129,12 +129,12 @@ var/list/possible_cable_coil_colours = list(
 /obj/structure/cable/hide(var/i)
 	if(istype(loc, /turf))
 		invisibility = i ? 101 : 0
-	updateicon()
+	update_icon()
 
 /obj/structure/cable/hides_under_flooring()
 	return 1
 
-/obj/structure/cable/proc/updateicon()
+/obj/structure/cable/update_icon()
 	icon_state = "[d1]-[d2]"
 	alpha = invisibility ? 127 : 255
 
@@ -635,102 +635,75 @@ obj/structure/cable/proc/cableColor(var/colorC)
 //////////////////////////////////////////////
 
 // called when cable_coil is clicked on a turf/simulated/floor
-/obj/item/stack/cable_coil/proc/turf_place(turf/simulated/floor/F, mob/user)
+/obj/item/stack/cable_coil/proc/turf_place(turf/simulated/F, mob/user)
 	if(!isturf(user.loc))
 		return
 
 	if(get_amount() < 1) // Out of cable
-		user << "There is no cable left."
+		to_chat(user, "There is no cable left.")
 		return
 
 	if(get_dist(F,user) > 1) // Too far
-		user << "You can't lay cable at a place that far away."
+		to_chat(user, "You can't lay cable at a place that far away.")
 		return
 
 	if(!F.is_plating())		// Ff floor is intact, complain
-		user << "You can't lay cable there unless the floor tiles are removed."
+		to_chat(user, "You can't lay cable there unless the floor tiles are removed.")
 		return
 
+	var/dirn
+	if(user.loc == F)
+		dirn = user.dir			// if laying on the tile we're on, lay in the direction we're facing
 	else
-		var/dirn
+		dirn = get_dir(F, user)
 
-		if(user.loc == F)
-			dirn = user.dir			// if laying on the tile we're on, lay in the direction we're facing
-		else
-			dirn = get_dir(F, user)
+	var/end_dir = 0
+	if(istype(F, /turf/simulated/open))
+		if(!can_use(2))
+			to_chat(user, "You don't have enough cable to do this!")
+			return
+		end_dir = DOWN
 
-		for(var/obj/structure/cable/LC in F)
-			if((LC.d1 == dirn && LC.d2 == 0 ) || ( LC.d2 == dirn && LC.d1 == 0))
-				user << "<span class='warning'>There's already a cable at that position.</span>"
-				return
-///// Z-Level Stuff
-		// check if the target is open space
-		if(istype(F, /turf/simulated/open))
-			for(var/obj/structure/cable/LC in F)
-				if((LC.d1 == dirn && LC.d2 == 11 ) || ( LC.d2 == dirn && LC.d1 == 11))
-					user << "<span class='warning'>There's already a cable at that position.</span>"
-					return
+	for(var/obj/structure/cable/LC in F)
+		if((LC.d1 == dirn && LC.d2 == end_dir ) || ( LC.d2 == dirn && LC.d1 == end_dir))
+			to_chat(user, "<span class='warning'>There's already a cable at that position.</span>")
+			return
 
-			var/obj/structure/cable/C = new(F)
-			var/obj/structure/cable/D = new(GetBelow(F))
+	put_cable(F, user, end_dir, dirn)
+	if(end_dir == DOWN)
+		put_cable(GetBelow(F), user, UP, 0)
+		to_chat(user, "You slide some cable downward.")
 
-			C.cableColor(color)
+/obj/item/stack/cable_coil/proc/put_cable(turf/simulated/F, mob/user, d1, d2)
+	if(!istype(F))
+		return
 
-			C.d1 = 11
-			C.d2 = dirn
-			C.add_fingerprint(user)
-			C.updateicon()
+	var/obj/structure/cable/C = new(F)
+	C.cableColor(color)
+	C.d1 = d1
+	C.d2 = d2
+	C.add_fingerprint(user)
+	C.update_icon()
 
-			var/datum/powernet/PN = new()
-			PN.add_cable(C)
+	//create a new powernet with the cable, if needed it will be merged later
+	var/datum/powernet/PN = new()
+	PN.add_cable(C)
 
-			C.mergeConnectedNetworks(C.d2)
-			C.mergeConnectedNetworksOnTurf()
+	C.mergeConnectedNetworks(C.d1) //merge the powernets...
+	C.mergeConnectedNetworks(C.d2) //...in the two new cable directions
+	C.mergeConnectedNetworksOnTurf()
 
-			D.cableColor(color)
+	if(C.d1 & (C.d1 - 1))// if the cable is layed diagonally, check the others 2 possible directions
+		C.mergeDiagonalsNetworks(C.d1)
 
-			D.d1 = 12
-			D.d2 = 0
-			D.add_fingerprint(user)
-			D.updateicon()
+	if(C.d2 & (C.d2 - 1))// if the cable is layed diagonally, check the others 2 possible directions
+		C.mergeDiagonalsNetworks(C.d2)
 
-			PN.add_cable(D)
-			D.mergeConnectedNetworksOnTurf()
-
-		// do the normal stuff
-		else
-///// Z-Level Stuff
-			for(var/obj/structure/cable/LC in F)
-				if((LC.d1 == dirn && LC.d2 == 0 ) || ( LC.d2 == dirn && LC.d1 == 0))
-					user << "There's already a cable at that position."
-					return
-
-			var/obj/structure/cable/C = new(F)
-
-			C.cableColor(color)
-
-			//set up the new cable
-			C.d1 = 0 //it's a O-X node cable
-			C.d2 = dirn
-			C.add_fingerprint(user)
-			C.updateicon()
-
-			//create a new powernet with the cable, if needed it will be merged later
-			var/datum/powernet/PN = new()
-			PN.add_cable(C)
-
-			C.mergeConnectedNetworks(C.d2) //merge the powernet with adjacents powernets
-			C.mergeConnectedNetworksOnTurf() //merge the powernet with on turf powernets
-
-			if(C.d2 & (C.d2 - 1))// if the cable is layed diagonally, check the others 2 possible directions
-				C.mergeDiagonalsNetworks(C.d2)
-
-
-			use(1)
-			if (C.shock(user, 50))
-				if (prob(50)) //fail
-					new/obj/item/stack/cable_coil(C.loc, 1, C.color)
-					qdel(C)
+	use(1)
+	if (C.shock(user, 50))
+		if (prob(50)) //fail
+			new/obj/item/stack/cable_coil(C.loc, 1, C.color)
+			qdel(C)
 
 // called when cable_coil is click on an installed obj/cable
 // or click on a turf that already contains a "node" cable
@@ -745,10 +718,9 @@ obj/structure/cable/proc/cableColor(var/colorC)
 		return
 
 	if(get_dist(C, user) > 1)		// make sure it's close enough
-		user << "You can't lay cable at a place that far away."
+		to_chat(user, "You can't lay cable at a place that far away.")
 		return
 
-
 	if(U == T) //if clicked on the turf we're standing on, try to put a cable in the direction we're facing
 		turf_place(T,user)
 		return
@@ -758,7 +730,7 @@ obj/structure/cable/proc/cableColor(var/colorC)
 	// one end of the clicked cable is pointing towards us
 	if(C.d1 == dirn || C.d2 == dirn)
 		if(!U.is_plating())						// can't place a cable if the floor is complete
-			user << "You can't lay cable there unless the floor tiles are removed."
+			to_chat(user, "You can't lay cable there unless the floor tiles are removed.")
 			return
 		else
 			// cable is pointing at us, we're standing on an open tile
@@ -768,34 +740,9 @@ obj/structure/cable/proc/cableColor(var/colorC)
 
 			for(var/obj/structure/cable/LC in U)		// check to make sure there's not a cable there already
 				if(LC.d1 == fdirn || LC.d2 == fdirn)
-					user << "There's already a cable at that position."
+					to_chat(user, "There's already a cable at that position.")
 					return
-
-			var/obj/structure/cable/NC = new(U)
-			NC.cableColor(color)
-
-			NC.d1 = 0
-			NC.d2 = fdirn
-			NC.add_fingerprint()
-			NC.updateicon()
-
-			//create a new powernet with the cable, if needed it will be merged later
-			var/datum/powernet/newPN = new()
-			newPN.add_cable(NC)
-
-			NC.mergeConnectedNetworks(NC.d2) //merge the powernet with adjacents powernets
-			NC.mergeConnectedNetworksOnTurf() //merge the powernet with on turf powernets
-
-			if(NC.d2 & (NC.d2 - 1))// if the cable is layed diagonally, check the others 2 possible directions
-				NC.mergeDiagonalsNetworks(NC.d2)
-
-			use(1)
-
-			if (NC.shock(user, 50))
-				if (prob(50)) //fail
-					new/obj/item/stack/cable_coil(NC.loc, 1, NC.color)
-					qdel(NC)
-
+			put_cable(U,user,0,fdirn)
 			return
 
 	// exisiting cable doesn't point at our position, so see if it's a stub
@@ -814,7 +761,7 @@ obj/structure/cable/proc/cableColor(var/colorC)
 			if(LC == C)			// skip the cable we're interacting with
 				continue
 			if((LC.d1 == nd1 && LC.d2 == nd2) || (LC.d1 == nd2 && LC.d2 == nd1) )	// make sure no cable matches either direction
-				user << "There's already a cable at that position."
+				to_chat(user, "There's already a cable at that position.")
 				return
 
 
@@ -824,7 +771,7 @@ obj/structure/cable/proc/cableColor(var/colorC)
 		C.d2 = nd2
 
 		C.add_fingerprint()
-		C.updateicon()
+		C.update_icon()
 
 
 		C.mergeConnectedNetworks(C.d1) //merge the powernets...

maps/example/example-1.dmm

@@ -0,0 +1,73 @@
+"a" = (/turf/space,/area/space)
+"b" = (/turf/simulated/wall,/area/aisat)
+"c" = (/obj/machinery/atmospherics/pipe/zpipe/up{tag = "icon-up (EAST)"; icon_state = "up"; dir = 4},/obj/structure/disposalpipe/up,/turf/simulated/floor/plating,/area/aisat)
+"d" = (/obj/machinery/atmospherics/pipe/simple/visible{dir = 4},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"e" = (/obj/machinery/atmospherics/pipe/manifold/visible{dir = 1},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"f" = (/obj/machinery/atmospherics/binary/pump/high_power{dir = 8},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"g" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (SOUTHWEST)"; icon_state = "intact"; dir = 10},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"h" = (/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"i" = (/obj/machinery/light{dir = 1},/turf/simulated/floor/tiled/dark,/area/aisat)
+"j" = (/obj/structure/disposalpipe/segment,/turf/simulated/floor/plating,/area/aisat)
+"k" = (/obj/machinery/atmospherics/pipe/simple/visible,/obj/effect/floor_decal/corner/white/diagonal,/obj/machinery/meter,/turf/simulated/floor/tiled/dark,/area/aisat)
+"l" = (/obj/machinery/atmospherics/portables_connector{dir = 4},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"m" = (/obj/machinery/atmospherics/pipe/manifold/visible{tag = "icon-map (EAST)"; icon_state = "map"; dir = 4},/obj/effect/floor_decal/corner/white/diagonal,/obj/machinery/meter,/turf/simulated/floor/tiled/dark,/area/aisat)
+"n" = (/turf/simulated/floor/tiled/dark,/area/aisat)
+"o" = (/obj/effect/floor_decal/industrial/hatch/yellow,/turf/simulated/floor/tiled/dark,/area/aisat)
+"p" = (/obj/machinery/portable_atmospherics/canister/empty,/obj/effect/floor_decal/corner/white/diagonal,/obj/structure/disposalpipe/segment,/turf/simulated/floor/tiled/dark,/area/aisat)
+"q" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (NORTHEAST)"; icon_state = "intact"; dir = 5},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"r" = (/obj/machinery/atmospherics/binary/pump/high_power{tag = "icon-map_off (EAST)"; icon_state = "map_off"; dir = 4},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"s" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (NORTHWEST)"; icon_state = "intact"; dir = 9},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"t" = (/obj/structure/ladder/up,/turf/simulated/floor/tiled/dark,/area/aisat)
+"u" = (/obj/machinery/portable_atmospherics/canister/air,/obj/effect/floor_decal/corner/white/diagonal,/obj/structure/disposalpipe/segment,/turf/simulated/floor/tiled/dark,/area/aisat)
+"v" = (/obj/machinery/light,/turf/simulated/floor/tiled/dark,/area/aisat)
+"w" = (/obj/machinery/alarm{dir = 4; icon_state = "alarm0"; pixel_x = -22},/obj/machinery/light{icon_state = "tube1"; dir = 8},/obj/machinery/disposal,/obj/structure/disposalpipe/trunk{tag = "icon-pipe-t (NORTH)"; icon_state = "pipe-t"; dir = 1},/turf/simulated/floor/tiled/dark,/area/aisat)
+"x" = (/obj/machinery/light{icon_state = "tube1"; dir = 4},/turf/simulated/floor/tiled/dark,/area/aisat)
+"y" = (/obj/machinery/light_switch,/turf/simulated/wall,/area/aisat)
+"z" = (/obj/machinery/light{icon_state = "tube1"; dir = 8},/turf/simulated/floor/tiled/dark,/area/aisat)
+"A" = (/obj/machinery/light{icon_state = "tube1"; dir = 4},/obj/machinery/power/apc{dir = 4; name = "east bump"; pixel_x = 24},/obj/structure/cable/yellow{d2 = 2; icon_state = "0-2"},/turf/simulated/floor/tiled/dark,/area/aisat)
+"B" = (/obj/effect/floor_decal/corner/white/diagonal,/obj/structure/table/standard,/obj/item/device/multitool,/turf/simulated/floor/tiled/dark,/area/aisat)
+"C" = (/obj/machinery/light{dir = 1},/obj/structure/table/standard,/obj/item/weapon/storage/belt/utility/full,/turf/simulated/floor/tiled/dark,/area/aisat)
+"D" = (/obj/effect/floor_decal/corner/white/diagonal,/obj/structure/table/standard,/obj/item/clothing/gloves/yellow,/turf/simulated/floor/tiled/dark,/area/aisat)
+"E" = (/obj/structure/cable/yellow{d1 = 1; d2 = 2; icon_state = "1-2"},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"F" = (/obj/effect/landmark{name = "JoinLate"},/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"G" = (/obj/effect/landmark/start,/turf/simulated/floor/tiled/dark,/area/aisat)
+"H" = (/obj/structure/stairs/south,/turf/simulated/floor/tiled/dark,/area/aisat)
+"I" = (/obj/effect/floor_decal/sign/a,/turf/simulated/floor/tiled/dark,/area/aisat)
+"J" = (/obj/machinery/light,/obj/effect/floor_decal/corner/white/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat)
+"K" = (/obj/structure/cable/yellow,/obj/structure/cable/yellow{d1 = 16; d2 = 0; icon_state = "16-0"},/turf/simulated/floor/plating,/area/aisat)
+"L" = (/turf/simulated/floor/tiled/red,/area/aisat)
+
+(1,1,1) = {"
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaabbbbbbbbbbbbbbbaaaaaaaaa
+aaaaaaaabcdefghihhhhhhbaaaaaaaaa
+aaaaaaaabjhklmhnhhooohbaaaaaaaaa
+aaaaaaaabphqrshthhooohbaaaaaaaaa
+aaaaaaaabphhhhhnhhooohbaaaaaaaaa
+aaaaaaaabuhhhhhnhhhhhhbaaaaaaaaa
+aaaaaaaabuhhhhhvhhhhhhbaaaaaaaaa
+aaaaaaaabwnnnnxyznnnnAbaaaaaaaaa
+aaaaaaaabhhhhhBCDhhhhEbaaaaaaaaa
+aaaaaaaabhhFFFhnhhhhhEbaaaaaaaaa
+aaaaaaaabhhFFFhGhhhhhEbaaaaaaaaa
+aaaaaaaabnbFFFhnhhhhhEbaaaaaaaaa
+aaaaaaaabHbhhhhIhhhhhEbaaaaaaaaa
+aaaaaaaabbbhJhhnhhJhhKbaaaaaaaaa
+aaaaaaaabbbbbLLLLLbbbbbaaaaaaaaa
+aaaaaaaaaaaabLLLLLbaaaaaaaaaaaaa
+aaaaaaaaaaaabLLLLLbaaaaaaaaaaaaa
+aaaaaaaaaaaabLLLLLbaaaaaaaaaaaaa
+aaaaaaaaaaaabLLLLLbaaaaaaaaaaaaa
+aaaaaaaaaaaabbbbbbbaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+"}

maps/example/example-2.dmm

@@ -0,0 +1,69 @@
+"a" = (/turf/space,/area/space)
+"b" = (/obj/effect/landmark/map_data{height = 2; step_x = 0},/turf/space,/area/space)
+"c" = (/turf/simulated/wall,/area/aisat_interior)
+"d" = (/obj/structure/lattice,/obj/machinery/atmospherics/pipe/zpipe/down{tag = "icon-down (EAST)"; icon_state = "down"; dir = 4},/obj/structure/disposalpipe/down,/turf/simulated/open,/area/aisat_interior)
+"e" = (/obj/machinery/atmospherics/pipe/simple/visible{dir = 4},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"f" = (/obj/machinery/atmospherics/pipe/manifold/visible{dir = 1},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"g" = (/obj/machinery/atmospherics/binary/pump/high_power{dir = 8},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"h" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (SOUTHWEST)"; icon_state = "intact"; dir = 10},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"i" = (/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"j" = (/obj/machinery/light{dir = 1},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"k" = (/obj/structure/disposalpipe/segment,/turf/simulated/floor/plating,/area/aisat_interior)
+"l" = (/obj/machinery/atmospherics/pipe/simple/visible,/obj/effect/floor_decal/corner/lime/diagonal,/obj/machinery/meter,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"m" = (/obj/machinery/atmospherics/portables_connector{dir = 4},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"n" = (/obj/machinery/atmospherics/pipe/manifold/visible{tag = "icon-map (EAST)"; icon_state = "map"; dir = 4},/obj/effect/floor_decal/corner/lime/diagonal,/obj/machinery/meter,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"o" = (/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"p" = (/turf/simulated/open,/area/aisat_interior)
+"q" = (/obj/machinery/portable_atmospherics/canister/empty,/obj/effect/floor_decal/corner/lime/diagonal,/obj/structure/disposalpipe/segment,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"r" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (NORTHEAST)"; icon_state = "intact"; dir = 5},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"s" = (/obj/machinery/atmospherics/binary/pump/high_power{tag = "icon-map_off (EAST)"; icon_state = "map_off"; dir = 4},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"t" = (/obj/machinery/atmospherics/pipe/simple/visible{tag = "icon-intact (NORTHWEST)"; icon_state = "intact"; dir = 9},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"u" = (/obj/structure/ladder,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"v" = (/obj/machinery/portable_atmospherics/canister/air,/obj/effect/floor_decal/corner/lime/diagonal,/obj/structure/disposalpipe/segment,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"w" = (/obj/machinery/light,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"x" = (/obj/machinery/alarm{dir = 4; icon_state = "alarm0"; pixel_x = -22},/obj/machinery/light{icon_state = "tube1"; dir = 8},/obj/machinery/disposal,/obj/structure/disposalpipe/trunk{tag = "icon-pipe-t (NORTH)"; icon_state = "pipe-t"; dir = 1},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"y" = (/obj/machinery/light{icon_state = "tube1"; dir = 4},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"z" = (/obj/machinery/light_switch,/turf/simulated/wall,/area/aisat_interior)
+"A" = (/obj/machinery/power/fractal_reactor,/obj/structure/cable/yellow{d2 = 4; icon_state = "0-4"},/obj/machinery/light{icon_state = "tube1"; dir = 8},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"B" = (/obj/structure/cable/yellow{d1 = 4; d2 = 8; icon_state = "4-8"},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"C" = (/obj/machinery/power/apc{dir = 4; name = "east bump"; pixel_x = 24},/obj/structure/cable/yellow{d2 = 8; icon_state = "0-8"},/obj/structure/cable/yellow{d1 = 2; d2 = 8; icon_state = "2-8"},/obj/machinery/light{icon_state = "tube1"; dir = 4},/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"D" = (/obj/structure/cable/yellow{d1 = 1; d2 = 2; icon_state = "1-2"},/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"E" = (/turf/simulated/floor/tiled/red,/area/aisat_interior)
+"F" = (/obj/effect/floor_decal/sign/two,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"G" = (/obj/machinery/light,/obj/effect/floor_decal/corner/lime/diagonal,/turf/simulated/floor/tiled/dark,/area/aisat_interior)
+"H" = (/obj/structure/lattice,/obj/structure/cable/yellow{d1 = 32; icon_state = "32-1"},/turf/simulated/open,/area/aisat_interior)
+
+(1,1,1) = {"
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaabaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaacccccccccccccccaaaaaaaaa
+aaaaaaaacdefghijiiiiiicaaaaaaaaa
+aaaaaaaackilmnioiipppicaaaaaaaaa
+aaaaaaaacqirstiuiipppicaaaaaaaaa
+aaaaaaaacqiiiiioiipppicaaaaaaaaa
+aaaaaaaacviiiiioiiiiiicaaaaaaaaa
+aaaaaaaacviiiiiwiiiiiicaaaaaaaaa
+aaaaaaaacxooooyzABBBBCcaaaaaaaaa
+aaaaaaaaciiiiiijiiiiiDcaaaaaaaaa
+aaaaaaaaciiiiiioiiiiiDcaaaaaaaaa
+aaaaaaaaccciiiioiiiiiDcaaaaaaaaa
+aaaaaaaacEciiiioiiiiiDcaaaaaaaaa
+aaaaaaaacEciiiiFiiiiiDcaaaaaaaaa
+aaaaaaaaciiiGiioiiGiiHcaaaaaaaaa
+aaaaaaaacccccEEEEEcccccaaaaaaaaa
+aaaaaaaaaaaacEEEEEcaaaaaaaaaaaaa
+aaaaaaaaaaaacEEEEEcaaaaaaaaaaaaa
+aaaaaaaaaaaacEEEEEcaaaaaaaaaaaaa
+aaaaaaaaaaaacEEEEEcaaaaaaaaaaaaa
+aaaaaaaaaaaacccccccaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa
+"}

maps/example/example.dm

@@ -0,0 +1,14 @@
+#if !defined(USING_MAP_DATUM)
+
+	#include "example-1.dmm"
+	#include "example-2.dmm"
+
+	#include "example_defines.dm"
+
+	#define USING_MAP_DATUM /datum/map/example
+
+#elif !defined(MAP_OVERRIDE)
+
+	#warn A map has already been included, ignoring Northern Star
+
+#endif

maps/example/example_defines.dm

@@ -0,0 +1,49 @@
+#define Z_LEVEL_FIRST_EXAMPLE					1
+#define Z_LEVEL_SECOND_EXAMPLE					2
+
+/datum/map/example
+	name = "Test Map"
+	full_name = "The Test Map"
+	path = "example"
+
+	lobby_icon = 'icons/misc/title.dmi'
+	lobby_screens = list("mockingjay00")
+
+	station_levels = list(
+		Z_LEVEL_FIRST_EXAMPLE,
+		Z_LEVEL_SECOND_EXAMPLE
+		)
+
+	admin_levels = list()
+	contact_levels = list(
+		Z_LEVEL_FIRST_EXAMPLE,
+		Z_LEVEL_SECOND_EXAMPLE
+		)
+
+	player_levels = list(
+		Z_LEVEL_FIRST_EXAMPLE,
+		Z_LEVEL_SECOND_EXAMPLE
+		)
+
+	sealed_levels = list()
+	empty_levels = list()
+	accessible_z_levels = list("1" = 50, "2" = 50) // The defines can't be used here sadly.
+	base_turf_by_z = list("2" = /turf/simulated/open)
+
+	station_name  = "The Funhouse"
+	station_short = "Funhouse"
+	dock_name     = "the Maximum Fun Chamber"
+	boss_name     = "Mister Fun"
+	boss_short    = "Mr. Fun"
+	company_name  = "Fun Inc."
+	company_short = "FI"
+	starsys_name  = "Vir"
+
+	shuttle_docked_message = "The scheduled shuttle to the %dock_name% has docked with the station at docks one and two. It will depart in approximately %ETD%."
+	shuttle_leaving_dock = "The Crew Transfer Shuttle has left the station. Estimate %ETA% until the shuttle docks at %dock_name%."
+	shuttle_called_message = "A crew transfer to %Dock_name% has been scheduled. The shuttle has been called. Those leaving should procede to docks one and two in approximately %ETA%"
+	shuttle_recall_message = "The scheduled crew transfer has been cancelled."
+	emergency_shuttle_docked_message = "The Emergency Shuttle has docked with the station at docks one and two. You have approximately %ETD% to board the Emergency Shuttle."
+	emergency_shuttle_leaving_dock = "The Emergency Shuttle has left the station. Estimate %ETA% until the shuttle docks at %dock_name%."
+	emergency_shuttle_called_message = "An emergency evacuation shuttle has been called. It will arrive at docks one and two in approximately %ETA%"
+	emergency_shuttle_recall_message = "The emergency shuttle has been recalled."

maps/northern_star/northern_star.dm

@@ -6,6 +6,8 @@
 	#include "polaris-4.dmm"
 	#include "polaris-5.dmm"
 
+	#include "northern_star_defines.dm"
+
 	#define USING_MAP_DATUM /datum/map/northern_star
 
 #elif !defined(MAP_OVERRIDE)

polaris.dme

@@ -205,6 +205,7 @@
 #include "code\datums\observation\moved.dm"
 #include "code\datums\observation\observation.dm"
 #include "code\datums\observation\task_triggered.dm"
+#include "code\datums\observation\turf_changed.dm"
 #include "code\datums\observation\unequipped.dm"
 #include "code\datums\observation\~cleanup.dm"
 #include "code\datums\repositories\cameras.dm"
@@ -2173,6 +2174,5 @@
 #include "interface\interface.dm"
 #include "interface\skin.dmf"
 #include "maps\northern_star\northern_star.dm"
-#include "maps\northern_star\northern_star_defines.dm"
 #include "maps\~map_system\maps.dm"
 // END_INCLUDE