Adds a megafauna_safe_range var to ruin datums and adds a megafauna exclusion zone to ghost spawn ruins on lavaland. (#29120)

* add exclusion check, change area types, update script

* merged the 2 for loops

* removed commented out section

* rename updatepaths script

* var

* undo area and map edits

* add safe var for ruin datums, add megafauna distance check for safe ruins

* removed unneeded file

* rename variable

code/datums/ruins.dm

@@ -7,6 +7,8 @@
 		wooden container filled with 18th century coinage in the middle of a \
 		lavawracked hellscape? It is clearly a mystery."
 
+	/// Prevents megafauna spawning within a certain range of ruins.
+	var/megafauna_safe_range = FALSE
 	var/unpickable = FALSE 	 //If TRUE these won't be placed automatically (can still be forced or loaded with another ruin)
 	var/always_place = FALSE //Will skip the whole weighting process and just plop this down, ideally you want the ruins of this kind to have no cost.
 	var/placement_weight = 1 //How often should this ruin appear

code/datums/ruins/lavaland.dm

@@ -27,6 +27,7 @@
 	suffix = "lavaland_surface_seed_vault.dmm"
 	allow_duplicates = FALSE
 	always_place = TRUE
+	megafauna_safe_range = TRUE
 
 /datum/map_template/ruin/lavaland/seed_vault_eden
 	name = "Garden of Eden"
@@ -44,6 +45,7 @@
 	Probably best to stay clear."
 	suffix = "lavaland_surface_ash_walker1.dmm"
 	allow_duplicates = FALSE
+	megafauna_safe_range = TRUE
 
 /datum/map_template/ruin/lavaland/ash_walker_siege
 	name = "Ash Walker Siege"
@@ -61,6 +63,7 @@
 	suffix = "lavaland_surface_golem_ship.dmm"
 	allow_duplicates = FALSE
 	always_place = TRUE
+	megafauna_safe_range = TRUE
 
 /datum/map_template/ruin/lavaland/althland_facility
 	name = "Althland Facility"
@@ -197,6 +200,7 @@
 	suffix = "lavaland_surface_hermit.dmm"
 	allow_duplicates = FALSE
 	always_place = TRUE
+	megafauna_safe_range = TRUE
 
 /datum/map_template/ruin/lavaland/miningripley
 	name = "Ripley"

code/game/objects/effects/spawners/random/pool/lavaland_pools.dm

@@ -27,6 +27,7 @@
 
 	var/fauna_scan_range = 12
 	var/megafauna_scan_range = 16
+	var/ghost_ruin_scan_range = 12
 	var/turf/mining_base_gps
 
 	loot = list(
@@ -94,6 +95,15 @@
 		if(ismegafauna(thing) && get_dist(T, thing) <= megafauna_scan_range)
 			return FALSE
 
+	for(var/obj/effect/landmark/ruin/ruin_landmark in GLOB.ruin_landmarks)
+		var/datum/map_template/ruin/template = ruin_landmark.ruin_template
+		// avoid spawning a megafauna if it's too close to a ghost spawn ruin
+		if(template.megafauna_safe_range)
+			// largest axis halved + the ruin scan range
+			var/exclusion_distance = (template.width > template.height ? template.width : template.height * 0.5) + ghost_ruin_scan_range
+			if(get_dist(T, ruin_landmark) < exclusion_distance)
+				return FALSE
+
 	return ..()
 
 /obj/effect/spawner/random/pool/lavaland_fauna/megafauna/unique