Compose vessels from definitions and capabilities

VesselWeaponComponent.gd

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+class_name VesselWeaponComponent
+extends Node
+
+var capability_id: String = "weapon"
+var fire_range: float
+var fire_cooldown: float
+var projectile_damage: int
+var fire_timer: float = 0.0
+var projectile_scene: PackedScene = preload("res://Projectile.tscn")
+
+
+func apply_stats() -> void:
+	var ship: Node = get_parent()
+	var state: Node = ship.get_tree().root.get_node("GameState")
+	fire_range = state.vessel_stat(ship.vessel_type, "fire_range")
+	fire_cooldown = state.vessel_stat(ship.vessel_type, "fire_cooldown")
+	projectile_damage = int(state.vessel_stat(ship.vessel_type, "damage"))
+
+
+func tick(delta: float) -> void:
+	fire_timer -= delta
+	if fire_timer > 0.0:
+		return
+	var ship: Node2D = get_parent()
+	var target: Node2D = _find_nearest_enemy(ship)
+	if target == null:
+		fire_timer = 0.25
+		return
+	var projectile: Node2D = projectile_scene.instantiate()
+	projectile.position = ship.position
+	projectile.damage = projectile_damage
+	ship.get_tree().root.add_child(projectile)
+	projectile.launch(target.position - ship.position)
+	fire_timer = fire_cooldown
+
+
+func _find_nearest_enemy(ship: Node2D) -> Node2D:
+	var nearest: Node2D = null
+	var best_distance: float = fire_range
+	for enemy in ship.get_tree().get_nodes_in_group("enemies"):
+		if not is_instance_valid(enemy):
+			continue
+		var distance: float = ship.position.distance_to(enemy.position)
+		if distance <= best_distance:
+			best_distance = distance
+			nearest = enemy
+	return nearest