55 lines
1.9 KiB
GDScript3
55 lines
1.9 KiB
GDScript3
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class_name EnemySpawnerComponent
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extends Node
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# Continuously spawns another enemy type beside its host, at a fixed
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# interval, capped at max_alive concurrently. The spawned enemies are
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# added as children of the spawner's OWN PARENT - not the spawner itself -
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# so killing the spawner never frees its already-spawned children (they
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# are siblings, not descendants) and so a surface-hosted spawner keeps its
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# spawns under the same host a `../Fleet`-style path assumption would miss
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# (see #44's note on why that hazard exists for anything parented under a
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# planet surface's PlanetSetupHost rather than directly under Main.tscn).
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var capability_id: String = "spawner"
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@export var spawn_interval: float = 4.0
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@export var spawned_enemy_id: String = "chaser"
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@export var max_alive: int = 6
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@export var spawn_radius: float = 90.0
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var spawn_timer: float = 0.0
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var spawned: Array = []
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var enemy_scene: PackedScene = preload("res://Enemy.tscn")
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func tick(delta: float) -> void:
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spawned = spawned.filter(func(node): return is_instance_valid(node))
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if spawned.size() >= max_alive:
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return
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spawn_timer -= delta
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if spawn_timer > 0.0:
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return
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spawn_timer = spawn_interval
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var fleet: Node2D = get_tree().get_first_node_in_group("player_fleet")
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if fleet == null or fleet.ships.is_empty():
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return
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var spawner: Node2D = get_parent()
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var host: Node = spawner.get_parent()
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if host == null:
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return
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var angle: float = randf() * TAU
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var offset: Vector2 = Vector2(cos(angle), sin(angle)) * spawn_radius
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var new_enemy: Node2D = enemy_scene.instantiate()
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new_enemy.enemy_id = spawned_enemy_id
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# spawner.position is already expressed in `host`'s local space, and
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# new_enemy is about to be added to that same `host` - unlike
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# EnemyRangedWeaponComponent's projectile, which reparents to root and
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# needs global_position, there is no space conversion needed here.
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new_enemy.position = spawner.position + offset
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host.add_child(new_enemy)
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spawned.append(new_enemy)
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