add unit creation from anthill

scripts/anthill.gd

@@ -1,4 +1,22 @@
 extends Interactable
+class_name Anthill
+
+const SPAWN_RADIUS: float = 1
 
 var honeydew: int = 0
 
+var ant_nitwit := preload("res://scenes/units/ant_nitwit.tscn")
+
+@onready var nitwits_holder: Node = $/root/World/Units/Nitwits
+
+func _click() -> void:
+	var spawn_pos_angle := randf_range(0, 360)
+	var new_pos_offset := Vector3.BACK.rotated(Vector3.UP, spawn_pos_angle)
+	var new_pos := global_position + (new_pos_offset * SPAWN_RADIUS)
+	var new_unit := (
+			(ant_nitwit.instantiate() as AntNitwit).initialize(
+					self,
+					new_pos
+			)
+	)
+	nitwits_holder.add_child(new_unit)

scripts/units/controlled_unit.gd

@@ -4,6 +4,8 @@ class_name ControlledUnit
 signal moving_started
 signal moving_ended
 
+var anthill: Anthill
+
 var selected: bool = false
 var moving_to_target: bool = false
 var ground_plane: Plane = Plane(Vector3.UP, 0)
@@ -48,6 +50,12 @@ func _input(event: InputEvent) -> void:
 			_set_target_click(button_event.position)
 
 
+func initialize(from: Anthill, pos: Vector3) -> ControlledUnit:
+	anthill = from
+	global_position = pos
+	return self
+
+
 func set_selected(on: bool) -> void:
 	selected = on