Adds the dust anomaly (#19228)

* Dust anomaly

* FILTH

* Check for simulated turf instead

code/game/objects/effects/anomalies/_anomalies.dm

@@ -120,3 +120,5 @@
 			new /obj/effect/anomaly/dimensional(local_turf, null, drops_core)
 		if(WEATHER_ANOMALY)
 			new /obj/effect/anomaly/weather(local_turf, null, drops_core)
+		if(DUST_ANOMALY)
+			new /obj/effect/anomaly/dust(local_turf, null, drops_core)

code/game/objects/effects/anomalies/anomalies_dust.dm

@@ -0,0 +1,73 @@
+/obj/effect/anomaly/dust
+	name = "dust anomaly"
+	icon_state = "dust"
+	density = FALSE
+	anomaly_core = /obj/item/assembly/signaler/anomaly/dust
+	pass_flags = PASSTABLE | PASSGRILLE
+	layer = ABOVE_MOB_LAYER
+	lifespan = ANOMALY_COUNTDOWN_TIMER * 1.5
+
+	move_chance = 80
+
+	COOLDOWN_DECLARE(pulse_cooldown)
+	var/pulse_delay = 5 SECONDS
+
+/obj/effect/anomaly/dust/Initialize(mapload, new_lifespan, drops_core)
+	. = ..()
+	var/static/list/loc_connections = list(
+		COMSIG_ATOM_ENTERED = PROC_REF(on_entered)
+	)
+	AddElement(/datum/element/connect_loc, loc_connections)
+
+	animate(src, transform = matrix()*0.85, time = 3, loop = -1)
+	animate(transform = matrix(), time = 3, loop = -1)
+
+/obj/effect/anomaly/dust/proc/on_entered(datum/source, atom/movable/AM)
+	SIGNAL_HANDLER
+	if(istype(AM, /turf/simulated/floor))
+		var/turf/simulated/floor/floor = AM
+		if(floor.can_dirty)
+			floor.dirt += 50
+			floor.update_dirt()
+
+/obj/effect/anomaly/dust/anomalyEffect(seconds_per_tick)
+	. = ..()
+
+	if(!COOLDOWN_FINISHED(src, pulse_cooldown))
+		return
+
+	new /obj/effect/temp_visual/circle_wave/dirt(get_turf(src))
+	playsound(src, 'sound/effects/cosmic_energy.ogg', vol = 50, vary = TRUE)
+	COOLDOWN_START(src, pulse_cooldown, pulse_delay)
+	for(var/mob/living/carbon/human/person in viewers(5, src))
+		person.germ_level += rand(5, 10)
+		if(person.isSynthetic())
+			continue
+		if(person.is_mouth_covered())
+			continue
+		if(!person.has_lungs())
+			continue
+		person.emote(prob(50) ? "cough" : "sneeze")
+		person.Stun(2)
+		person.adjustOxyLoss(5)
+		if(prob(15))
+			person.Stun(2)
+			to_chat(person, span_danger(pick("You have a coughing fit!", "You can't stop coughing!")))
+			addtimer(CALLBACK(person, TYPE_PROC_REF(/mob, emote), "cough"), 1 SECONDS)
+			addtimer(CALLBACK(person, TYPE_PROC_REF(/mob, emote), "cough"), 3 SECONDS)
+			addtimer(CALLBACK(person, TYPE_PROC_REF(/mob, emote), "cough"), 6 SECONDS)
+
+	for(var/turf/simulated/floor/ground in circleviewturfs(src, 3))
+		if(ground.can_dirty)
+			ground.dirt += 20
+			ground.update_dirt()
+
+		if(prob(1))
+			new /obj/random/mob/vermin(ground)
+
+		if(prob(2))
+			new /obj/effect/decal/cleanable/filth(ground)
+
+/obj/effect/anomaly/dust/detonate()
+	COOLDOWN_RESET(src, pulse_cooldown)
+	anomalyEffect()

code/game/objects/effects/temporary_visuals/miscellaneous.dm

@@ -145,3 +145,6 @@
 
 /obj/effect/temp_visual/circle_wave/star_blast
 	color = COLOR_VOID_PURPLE
+
+/obj/effect/temp_visual/circle_wave/dirt
+	color = COLOR_ASTEROID_ROCK

code/game/objects/random/mob.dm

@@ -419,3 +419,21 @@
 				/mob/living/simple_mob/animal/sif/sakimm
 			)
 		)
+
+/obj/random/mob/vermin
+	name = "Random Vermin"
+	desc = "Often found in trash."
+	icon_state = "animal"
+	spawn_nothing_percentage = 15
+
+/obj/random/mob/vermin/item_to_spawn()
+	return pick(prob(15);/mob/living/simple_mob/animal/passive/mouse/white,
+				prob(15);/mob/living/simple_mob/animal/passive/mouse/black,
+				prob(30);/mob/living/simple_mob/animal/passive/mouse/brown,
+				prob(30);/mob/living/simple_mob/animal/passive/mouse/gray,
+				prob(30);/mob/living/simple_mob/animal/passive/mouse/rat,
+				prob(30);/obj/effect/spider/spiderling/non_growing,
+				prob(30);/mob/living/simple_mob/animal/passive/raccoon,
+				prob(30);/mob/living/simple_mob/animal/passive/opossum,
+				prob(40);/mob/living/simple_mob/animal/passive/cockroach,
+				)