THINGS YAY

behaviours/spawner.gd

@@ -1,16 +1,33 @@
 @icon("res://behaviours/spawner.svg")
-extends Area2D
+extends Node2D
 class_name Spawner
 
+
+## Emitted when a new scene is spawned.
 signal spawned(entity: Node2D)
 
+## Emitted when the [field blocking_tracker] prevents something from spawning.
+signal spawn_blocked
+
+
+## The scene to spawn.
 @export var scene: PackedScene
+
+## Where the scene should be parented to in the tree.
 @export var target: Node2D
 
+## If set, requires the tracker to not be tracking anything before spawning a scene.
+@export var blocking_tracker: Tracker
 
+
+## Spawn [field scene] at [field target] and the position of this node.
 func spawn():
+	if blocking_tracker != null:
+		if not blocking_tracker.tracking.is_empty():
+			spawn_blocked.emit()
+			return  # Perhaps enqueue the spawn?
 	if not target:
-		target = MainGame.get_ancestor(self).default_spawn_parent
+		target = MainGame.get_via_group(self).default_spawn_parent
 	if not target:
 		target = self
 	var entity = scene.instantiate()

behaviours/tracker.gd

@@ -2,7 +2,7 @@
 extends Area2D
 class_name Tracker
 
-## Abstract base class for [Area2D]s tracking a certain subset of [Node2D]s.
+## [Area2D]s tracking a certain subset of [Node2D]s.
 
 
 signal tracked(body: Node2D)
@@ -11,6 +11,9 @@ signal untracked(body: Node2D)
 var tracking: Array = []
 
 
+## Start [field tracking] a [Node2D]. 
+##
+## Returns whether the body was added to the [field tracking] array.
 func track(body: Node2D) -> bool:
 	var act: bool = not body in tracking
 	if act:
@@ -18,9 +21,12 @@ func track(body: Node2D) -> bool:
 		tracked.emit(body)
 		# Handle TrackerTracker
 		for tracker_tracker in body.find_children("*", "TrackerTracker", true, false):
-			tracker_tracker.track(self)
+			tracker_tracker.track_if_detected(self)
 	return act
 
+## Stop [field tracking] a [Node2D].
+##
+## Returns whether the body was removed from the [field tracking] array.
 func untrack(body: Node2D) -> bool:
 	var act: bool = body in tracking
 	if act:

behaviours/tracker.tscn

@@ -0,0 +1,12 @@
+[gd_scene load_steps=2 format=3 uid="uid://8jkesanu4hrn"]
+
+[ext_resource type="Script" path="res://behaviours/tracker.gd" id="1_4joji"]
+
+[node name="Tracker" type="Area2D"]
+collision_layer = 0
+collision_mask = 56
+monitorable = false
+script = ExtResource("1_4joji")
+
+[connection signal="body_entered" from="." to="." method="track"]
+[connection signal="body_exited" from="." to="." method="untrack"]

behaviours/tracker_tracker.gd

@@ -1,6 +1,24 @@
 extends Tracker
 class_name TrackerTracker
 
-## Tracks [Tracker]s tracking the parent. 
+## Tracks [Tracker]s tracking the parent.
-## 
+
-## Shape is ignored.
+
+## Start [field tracking] a [Node2D] if it overlaps this [Area2D]. 
+##
+## Returns whether the body was added to the [field tracking] array.
+func track_if_detected(body: Node2D) -> bool:
+	if overlaps_body(body):
+		return track(body)
+	return false
+
+## Start [field tracking] a [Node2D] if it has a [Tracker] tracking this node or one of its ancestors.
+##
+## Returns whether the body was added to the [field tracking] array.
+func track_if_tracked(body: Node2D) -> bool:
+	var act: bool = false
+	for tracker in body.find_children("*", "Tracker", true, false):
+		for ancestor in Traversal.get_ancestors(self):  # Make more efficient, perhaps?
+			if ancestor in tracker.tracking:
+				act = track(body) or act
+	return act

behaviours/tracker_tracker.tscn

@@ -4,7 +4,9 @@
 
 [node name="TrackerTracker" type="Area2D"]
 collision_layer = 0
-collision_mask = 0
+collision_mask = 24
-monitoring = false
 monitorable = false
 script = ExtResource("1_7b21r")
+
+[connection signal="body_entered" from="." to="." method="track_if_tracked"]
+[connection signal="body_exited" from="." to="." method="untrack"]

entities/gold.gd

@@ -9,7 +9,7 @@ func _on_move(movement: Vector2) -> void:
 	position += movement
 
 func _on_collected(tag: StringName) -> void:
-	var game = MainGame.get_ancestor(self)
+	var game = MainGame.get_via_group(self)
 	
 	# TODO: Perhaps use a dictionary in game to store multiple currencies?
 	match tag:

entities/imp.tscn

@@ -60,7 +60,6 @@ default_priority = 10
 alternative_priority = 10
 
 [node name="ChangeDirectionTimer" parent="MovementWander" instance=ExtResource("10_phvea")]
-wait_time = 0.001
 autostart = true
 mean_secs = 2.0
 deviation = 2.0

entities/sheep.tscn

@@ -153,6 +153,10 @@ alternative_priority = 40
 
 [node name="HunterSense" parent="MovementRunFromHunter" instance=ExtResource("14_eqowb")]
 
+[node name="Shape" type="CollisionShape2D" parent="MovementRunFromHunter/HunterSense"]
+shape = SubResource("CircleShape2D_etpf6")
+debug_color = Color(1, 1, 0, 0)
+
 [node name="TargetPicker" parent="MovementRunFromHunter/HunterSense" node_paths=PackedStringArray("tracker") instance=ExtResource("13_jf6em")]
 tracker = NodePath("..")
 

scenes/game/cursor.gd

@@ -4,7 +4,7 @@ class_name Cursor
 ## A [CharacterBody2D] syncing its position with the mouse on each physics timestep.
 
 
-@onready var game := MainGame.get_ancestor(self)
+@onready var game := MainGame.get_via_group(self)
 
 
 func _physics_process(_delta: float) -> void:

scenes/game/main_game.gd

@@ -2,17 +2,13 @@ extends Node2D
 class_name MainGame
 
 
-## Get the first possible [MainGame] instance by climbing the scene tree one ancestor at a time.
-static func get_ancestor(start: Node) -> MainGame:
-	var current = start
-	while current is Node:
-		if current is MainGame:
-			return current
-		current = current.get_parent()
-	Log.w(start, "MainGame ancestor not found.")
-	return null
-
-
 @onready var gold_counter: Counter = $"GoldCounter"
 @onready var camera: GameCamera = $"GameCamera"
 @onready var default_spawn_parent: Node2D = %"DefaultSpawnParent"
+
+
+static func get_via_group(node: Node) -> MainGame:
+	var result = node.get_tree().get_nodes_in_group("game")
+	if result.is_empty():
+		return null
+	return result[0]

traversal.gd

@@ -0,0 +1,11 @@
+class_name Traversal
+
+
+## Get the first possible [MainGame] instance by climbing the scene tree one ancestor at a time.
+static func get_ancestors(start: Node) -> Array[Node]:
+	var result: Array[Node] = []
+	var current = start
+	while current is Node:
+		result.push_back(current)
+		current = current.get_parent()
+	return result