A little cleanup

scripts/Ship/projectile.gd

@@ -0,0 +1,44 @@
+extends Node2D
+
+class_name Projectile
+
+@export var speed : float = 300
+@export var rotation_speed : float = 0
+@export var damage : float = 1
+@export var collider : Area2D
+@export var lifetime : float = 10
+
+var faction: Game.Faction = Game.Faction.None
+var destination_angle : float
+var target : Node2D = self
+
+func _ready():
+	get_tree().create_timer(lifetime).timeout.connect(queue_free)
+	collider.body_entered.connect(_on_collision)
+
+func _physics_process(delta):
+	if rotation_speed == 0: destination_angle = global_rotation_degrees
+	else: destination_angle = rad_to_deg(global_position.angle_to_point(target.global_position))
+	global_position += speed * delta * global_transform.x
+	var destination_difference : float
+	if abs(destination_angle - global_rotation_degrees) <= 180:
+		destination_difference = destination_angle - global_rotation_degrees
+	else:
+		destination_difference = global_rotation_degrees - destination_angle
+	if destination_difference != clamp(destination_difference, -1, 1):
+		global_rotation_degrees += sign(destination_difference) * rotation_speed * delta
+	else:
+		global_rotation_degrees = destination_angle
+
+func _on_collision(body):
+	match body.collision_layer:
+		1:
+			if body.ship.faction != faction:
+				if target != self:
+					target.queue_free()
+				body.ship.shield.deal_damage(damage)
+				queue_free()
+		2:
+			if target != self:
+				target.queue_free()
+			queue_free()