From 996091bebccf344d027b36d865bebdeb2fa0ef9d Mon Sep 17 00:00:00 2001
From: cheesePizza2 <34486300+cheesePizza2@users.noreply.github.com>
Date: Tue, 5 Mar 2024 20:24:33 -0500
Subject: [PATCH] Turnstiles (#2502)

Implements the turnstile icons sprited by Infra. They block entry coming from the sides (although, chances are you'll have walls there anyways) and the wrong direction. Taking enough damage will break the bars off (if you have a high enough move_force, you can just walk through it and it'll break itself). You can also hop over one in a second.
---
 mojave/icons/obstacles/turnstile.dmi | Bin 0 -> 1489 bytes
 mojave/structures/obstacles.dm       | 104 +++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)
 create mode 100644 mojave/icons/obstacles/turnstile.dmi

diff --git a/mojave/icons/obstacles/turnstile.dmi b/mojave/icons/obstacles/turnstile.dmi
new file mode 100644
index 0000000000000000000000000000000000000000..550f9457a7dec1205c079d962c164b34d5f9a895
GIT binary patch
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diff --git a/mojave/structures/obstacles.dm b/mojave/structures/obstacles.dm
index ef739de1aa8..718a9041f27 100644
--- a/mojave/structures/obstacles.dm
+++ b/mojave/structures/obstacles.dm
@@ -1058,3 +1058,107 @@
 	var/turf/my_turf = get_turf(loc)
 	if(my_turf)
 		REMOVE_TRAIT(my_turf, TRAIT_REMOVE_SLOWDOWN, STAIRS_ON_TURF)
+
+// Turnstiles //
+
+/**
+ * Turnstiles. They block movement in two directions (the two walls of the turnstile) and knock down people coming from another. Dir+180 is the intended entry direction.
+ * NOTE: we only have sprites for NORTH and SOUTH turnstiles.
+ *
+*/
+/obj/structure/ms13/turnstile
+	name = "turnstile"
+	desc = "You can only go one way... assuming you don't hop over."
+	icon = 'mojave/icons/obstacles/turnstile.dmi'
+	icon_state = "tourniquet"
+	density = TRUE
+	anchored = TRUE
+	max_integrity = 400
+	integrity_failure = 0.85
+
+/obj/structure/ms13/turnstile/Initialize()
+	. = ..()
+	AddElement(/datum/element/climbable, climb_time = 1 SECONDS, climb_stun = 0, no_stun = TRUE, jump_over = TRUE)
+
+	var/static/list/loc_connections = list(
+		COMSIG_ATOM_EXIT = .proc/on_exit,
+		COMSIG_ATOM_ENTERED = .proc/on_entered,
+	)
+	AddElement(/datum/element/connect_loc, loc_connections)
+
+/// Stop people from just walking out the side
+/obj/structure/ms13/turnstile/proc/on_exit(datum/source, atom/movable/leaving, direction)
+	SIGNAL_HANDLER
+
+	if(leaving == src)
+		return // Let's not block ourselves.
+
+	if((direction & dir) || (direction & turn(dir, 180)))
+		return
+
+	if (leaving.throwing)
+		return
+
+	if (leaving.movement_type & (PHASING | FLYING | FLOATING))
+		return
+
+	leaving.Bump(src)
+	return COMPONENT_ATOM_BLOCK_EXIT
+
+/// Handles flicking the rotation animation.
+/obj/structure/ms13/turnstile/proc/on_entered(datum/source, atom/movable/arrived, atom/old_loc, list/atom/old_locs)
+	SIGNAL_HANDLER
+
+	if(arrived.throwing)
+		return
+
+	if(arrived.movement_type & (PHASING | FLYING | FLOATING))
+		return
+
+	// ghetto check for if we're being climbed over (which sets our density to FALSE during the step)
+	if(!density)
+		return
+
+	if(!broken)
+		flick("rotating", src)
+
+/obj/structure/ms13/turnstile/CanAllowThrough(atom/movable/mover, border_dir)
+	. = ..()
+
+	if(istype(mover, /obj/projectile))
+		return
+
+	if(istype(mover, /obj/item))
+		var/obj/item/I = mover
+		if(I.w_class <= WEIGHT_CLASS_NORMAL)
+			return TRUE
+
+	if(ismob(mover))
+		if((border_dir == turn(dir, 90)) || (border_dir == turn(dir, -90)))
+			return
+
+	if((border_dir & turn(dir, 180)) && !broken)
+		if(mover.move_force >= MOVE_FORCE_STRONG)
+			// 20 damage at FORCE_STRONG, +10 for every step above that
+			take_damage(10 * mover.move_force / MOVE_FORCE_DEFAULT)
+
+		// taking damage could have broken the bars
+		if(!broken)
+			return
+
+	return TRUE
+
+/obj/structure/ms13/turnstile/CanAStarPass(obj/item/card/id/ID, to_dir, atom/movable/caller)
+	if ((to_dir == turn(dir, 90)) || (to_dir == turn(dir, -90)))
+		return FALSE
+	return ..()
+
+/obj/structure/ms13/turnstile/atom_break()
+	. = ..()
+	broken = TRUE
+	icon_state = "bent"
+
+/obj/structure/ms13/turnstile/atom_fix()
+	. = ..()
+	broken = FALSE
+	icon_state = "tourniquet"