Merge remote-tracking branch 'upstream/master' into health_data-performance

code/datums/components/swarming.dm

@@ -0,0 +1,55 @@
+/datum/component/swarming
+	var/offset_x = 0
+	var/offset_y = 0
+	var/is_swarming = FALSE
+	var/list/swarm_members = list()
+
+/datum/component/swarming/Initialize(max_x = 24, max_y = 24)
+	if(!ismovableatom(parent))
+		return COMPONENT_INCOMPATIBLE
+	offset_x = rand(-max_x, max_x)
+	offset_y = rand(-max_y, max_y)
+
+	RegisterSignal(parent, COMSIG_MOVABLE_CROSSED, .proc/join_swarm)
+	RegisterSignal(parent, COMSIG_MOVABLE_UNCROSSED, .proc/leave_swarm)
+
+/datum/component/swarming/Destroy()
+	for(var/other in swarm_members)
+		var/datum/component/swarming/other_swarm = other
+		other_swarm.swarm_members -= src
+		if(!other_swarm.swarm_members.len)
+			other_swarm.unswarm()
+	swarm_members = null
+	return ..()
+
+/datum/component/swarming/proc/join_swarm(datum/source, atom/movable/AM)
+	var/datum/component/swarming/other_swarm = AM.GetComponent(/datum/component/swarming)
+	if(!other_swarm)
+		return
+	swarm()
+	swarm_members |= other_swarm
+	other_swarm.swarm()
+	other_swarm.swarm_members |= src
+
+/datum/component/swarming/proc/leave_swarm(datum/source, atom/movable/AM)
+	var/datum/component/swarming/other_swarm = AM.GetComponent(/datum/component/swarming)
+	if(!other_swarm || !(other_swarm in swarm_members))
+		return
+	swarm_members -= other_swarm
+	if(!swarm_members.len)
+		unswarm()
+	other_swarm.swarm_members -= src
+	if(!other_swarm.swarm_members.len)
+		other_swarm.unswarm()
+
+/datum/component/swarming/proc/swarm()
+	var/atom/movable/owner = parent
+	if(!is_swarming)
+		is_swarming = TRUE
+		animate(owner, pixel_x = owner.pixel_x + offset_x, pixel_y = owner.pixel_y + offset_y, time = 2)
+
+/datum/component/swarming/proc/unswarm()
+	var/atom/movable/owner = parent
+	if(is_swarming)
+		animate(owner, pixel_x = owner.pixel_x - offset_x, pixel_y = owner.pixel_y - offset_y, time = 2)
+		is_swarming = FALSE