Refactored go-kart code (#29938)

* Refactored go-kart code

* Go-karts explode fuel tanks

* Improved speen(), correctly reset fucked up offsets when leaving vehicles

* Even better speen()

code/game/atoms.dm

@@ -206,9 +206,6 @@ var/global/list/ghdel_profiling = list()
 		if(T)
 			T.densityChanged()
 
-/atom/proc/bumped_by_firebird(var/obj/structure/bed/chair/vehicle/firebird/F)
-	return Bumped(F)
-
 // Convenience proc to see if a container is open for chemistry handling
 // returns true if open
 // false if closed

code/game/atoms_movable.dm

@@ -1193,3 +1193,13 @@
 	target = get_turf(target_loc)
 
 	current_tick = 1
+
+
+/atom/movable/proc/speen(times = 4)
+	set waitfor = FALSE
+	var/prev_dir = dir
+	for(var/i in 1 to times)
+		for(var/new_dir in cardinal)
+			change_dir(new_dir)
+			sleep(1)
+	change_dir(prev_dir)

code/game/objects/items/stacks/tiles/mineral.dm

@@ -141,7 +141,7 @@
 
 /obj/item/stack/tile/mineral/phazon/adjust_slowdown(mob/living/L, current_slowdown)
 	current_slowdown *= 0.75
-	..()
+	return ..()
 
 /obj/item/stack/tile/mineral/brass
 	name = "brass tile"

code/game/objects/items/weapons/clown_items.dm

@@ -13,6 +13,16 @@
 		if(slip_n_slide(M))
 			M.simple_message("<span class='notice'>You slipped on the [name]!</span>",
 				"<span class='userdanger'>Something is scratching at your feet! Oh god!</span>")
+	if(istype(AM, /obj/structure/bed/chair/vehicle/gokart))
+		var/obj/structure/bed/chair/vehicle/gokart/kart = AM
+		var/left_or_right = prob(50) ? turn(kart.dir, 90) : turn(kart.dir, -90)
+		var/tiles_to_slip = rand(round(potency/20, 1), round(potency/10, 1))
+		kart.speen()
+		playsound(src, 'sound/misc/slip.ogg', 50, 1, -3)
+		spawn()
+			for(var/i in 1 to tiles_to_slip)
+				step(kart, left_or_right)
+				sleep(1)
 
 /datum/locking_category/banana_peel
 

code/game/objects/structures/tables_racks.dm

@@ -320,8 +320,10 @@
 			return 1
 	return 0
 
-/obj/structure/table/bumped_by_firebird(obj/structure/bed/chair/vehicle/firebird/F)
-	destroy()
+/obj/structure/table/Bumped(atom/movable/AM)
+	..()
+	if(istype(AM, /obj/structure/bed/chair/vehicle/firebird))
+		destroy()
 
 //checks if projectile 'P' from turf 'from' can hit whatever is behind the table. Returns 1 if it can, 0 if bullet stops.
 /obj/structure/table/proc/check_cover(obj/item/projectile/P, turf/from)
@@ -778,8 +780,10 @@ obj/structure/table/plastic
 		return 1
 	return !density
 
-/obj/structure/rack/bumped_by_firebird(obj/structure/bed/chair/vehicle/firebird/F)
-	destroy()
+/obj/structure/rack/Bumped(atom/movable/AM)
+	..()
+	if(istype(AM, /obj/structure/bed/chair/vehicle/firebird))
+		destroy()
 
 /obj/structure/rack/attackby(obj/item/weapon/W as obj, mob/user as mob)
 	if(W.is_wrench(user) && can_disassemble())

code/game/objects/structures/vehicles/firebird.dm

@@ -29,7 +29,7 @@
 	plane = ABOVE_HUMAN_PLANE
 	pass_flags = PASSMOB|PASSDOOR
 	wreckage_type = /obj/effect/decal/mecha_wreckage/vehicle/firebird
-
+	explodes_fueltanks = TRUE
 	var/datum/effect/effect/system/trail/firebird/ion_trail
 
 /obj/structure/bed/chair/vehicle/firebird/New()
@@ -61,12 +61,6 @@
 /obj/structure/bed/chair/vehicle/firebird/handle_layer()
 	return
 
-/obj/structure/bed/chair/vehicle/firebird/to_bump(var/atom/obstacle)
-	if(throwing)
-		return ..()
-	else
-		return obstacle.bumped_by_firebird(src) //Yep
-
 /obj/structure/bed/chair/vehicle/firebird/santa
 	name = "magic snowmobile"
 	desc = "After a complaint from space PETA, santa's been forced to take a less elegant ride."

code/game/objects/structures/vehicles/gokart.dm

@@ -12,6 +12,13 @@
 	noghostspin = 0
 	can_have_carts = FALSE
 	wreckage_type = /obj/effect/decal/mecha_wreckage/vehicle/gokart
+	explodes_fueltanks = TRUE
+
+/obj/structure/bed/chair/vehicle/gokart/getMovementDelay()
+	. = ..()
+	var/turf/here = get_turf(src)
+	if(here)
+		return here.adjust_slowdown(src, .)
 
 /obj/structure/bed/chair/vehicle/gokart/unlock_atom(var/atom/movable/AM)
 	. = ..()

code/game/objects/structures/vehicles/vehicle.dm

@@ -60,6 +60,7 @@
 	var/list/datum/action/vehicle_actions = list()
 
 	var/headlights = FALSE
+	var/explodes_fueltanks = FALSE
 
 /obj/structure/bed/chair/vehicle/proc/getMovementDelay()
 	return movement_delay
@@ -421,8 +422,8 @@
 	if(!.)
 		return
 
-	AM.pixel_x -= offsets["[dir]"]["x"]
-	AM.pixel_y -= offsets["[dir]"]["y"]
+	AM.pixel_x = initial(AM.pixel_x)
+	AM.pixel_y = initial(AM.pixel_y)
 
 	last_dir = null
 

code/modules/mob/emote.dm

@@ -42,11 +42,7 @@
 /datum/emote/spin/run_emote(mob/user)
 	. = ..()
 	if(.)
-		var/prev_dir = user.dir
-		for(var/i in list(1, 4, 2, 8, 1, 4, 2, 8, 1, 4, 2, 8, 1, 4, 2, 8))
-			user.dir = i
-			sleep(1)
-		user.dir = prev_dir
+		user.speen()
 
 /datum/emote/me
 	key = "me"

code/modules/reagents/reagent_dispenser.dm

@@ -194,9 +194,13 @@
 	if(exposed_temperature >= AUTOIGNITION_WELDERFUEL)
 		explode()
 
-/obj/structure/reagent_dispensers/fueltank/bumped_by_firebird(var/obj/structure/bed/chair/vehicle/firebird/F)
-	visible_message("<span class='danger'>\the [F] crashes into \the [src]!</span>")
-	explode()
+/obj/structure/reagent_dispensers/fueltank/Bumped(atom/movable/AM)
+	..()
+	if(istype(AM, /obj/structure/bed/chair/vehicle))
+		var/obj/structure/bed/chair/vehicle/car = AM
+		if(car.explodes_fueltanks)
+			visible_message("<span class='danger'>\The [car] crashes into \the [src]!</span>")
+			explode()
 
 /obj/structure/reagent_dispensers/fueltank/proc/explode()
 	if (reagents.total_volume > 500)