86 lines
3.1 KiB
GDScript3
86 lines
3.1 KiB
GDScript3
|
extends Node2D
|
||
|
|
|
||
|
|
# Spawns slow-drifting asteroids inside ASTEROID_FIELD biome chunks near
|
||
|
|
# the fleet, and despawns them once the fleet has moved far enough away -
|
||
|
|
# keeps the scene from accumulating unbounded nodes over a long session
|
||
|
|
# while still populating newly-entered asteroid regions on the fly.
|
||
|
|
|
||
|
|
@export var check_interval: float = 1.0
|
||
|
|
@export var spawn_radius_chunks: int = 2
|
||
|
|
@export var despawn_radius_chunks: int = 4
|
||
|
|
@export var asteroids_per_chunk: int = 6
|
||
|
|
@export var min_speed: float = 12.0
|
||
|
|
@export var max_speed: float = 35.0
|
||
|
|
|
||
|
|
@onready var fleet: Node2D = get_node("../Fleet")
|
||
|
|
|
||
|
|
var asteroid_scene: PackedScene = preload("res://Asteroid.tscn")
|
||
|
|
var populated_chunks: Dictionary = {}
|
||
|
|
var timer: float = 0.0
|
||
|
|
|
||
|
|
|
||
|
|
func _ready() -> void:
|
||
|
|
randomize()
|
||
|
|
|
||
|
|
|
||
|
|
func _process(delta: float) -> void:
|
||
|
|
timer += delta
|
||
|
|
if timer < check_interval:
|
||
|
|
return
|
||
|
|
timer = 0.0
|
||
|
|
update_chunks()
|
||
|
|
|
||
|
|
|
||
|
|
func update_chunks() -> void:
|
||
|
|
# Public (not just called from _process's own timer): also invoked
|
||
|
|
# once synchronously right after the fleet is positioned on a fresh
|
||
|
|
# Main.tscn load, so nearby asteroids exist immediately instead of
|
||
|
|
# only appearing ~check_interval seconds later - most noticeable as a
|
||
|
|
# jarring pop-in right after returning from a planet's surface.
|
||
|
|
var center_chunk: Vector2i = WorldGen.chunk_coords(fleet.get_centroid())
|
||
|
|
|
||
|
|
for dx in range(-spawn_radius_chunks, spawn_radius_chunks + 1):
|
||
|
|
for dy in range(-spawn_radius_chunks, spawn_radius_chunks + 1):
|
||
|
|
var chunk: Vector2i = center_chunk + Vector2i(dx, dy)
|
||
|
|
if populated_chunks.has(chunk):
|
||
|
|
continue
|
||
|
|
if WorldGen.biome_at_chunk(chunk) != WorldGen.Biome.ASTEROID_FIELD:
|
||
|
|
continue
|
||
|
|
_spawn_chunk_asteroids(chunk)
|
||
|
|
|
||
|
|
var to_remove: Array = []
|
||
|
|
for chunk in populated_chunks.keys():
|
||
|
|
if _chebyshev_chunk_distance(chunk, center_chunk) > despawn_radius_chunks:
|
||
|
|
for asteroid in populated_chunks[chunk]:
|
||
|
|
if is_instance_valid(asteroid):
|
||
|
|
asteroid.queue_free()
|
||
|
|
to_remove.append(chunk)
|
||
|
|
for chunk in to_remove:
|
||
|
|
populated_chunks.erase(chunk)
|
||
|
|
|
||
|
|
|
||
|
|
func _chebyshev_chunk_distance(a: Vector2i, b: Vector2i) -> int:
|
||
|
|
return max(abs(a.x - b.x), abs(a.y - b.y))
|
||
|
|
|
||
|
|
|
||
|
|
func _spawn_chunk_asteroids(chunk: Vector2i) -> void:
|
||
|
|
var origin: Vector2 = WorldGen.chunk_origin(chunk)
|
||
|
|
var spawned: Array = []
|
||
|
|
|
||
|
|
for i in range(asteroids_per_chunk):
|
||
|
|
var local_pos: Vector2 = Vector2(randf() * WorldGen.CHUNK_SIZE, randf() * WorldGen.CHUNK_SIZE)
|
||
|
|
var asteroid: Node2D = asteroid_scene.instantiate()
|
||
|
|
asteroid.position = origin + local_pos
|
||
|
|
var angle: float = randf() * TAU
|
||
|
|
var speed: float = randf_range(min_speed, max_speed)
|
||
|
|
asteroid.velocity = Vector2(cos(angle), sin(angle)) * speed
|
||
|
|
asteroid.rotation_speed = randf_range(-0.4, 0.4)
|
||
|
|
# Deferred: update_chunks() can run synchronously from inside a
|
||
|
|
# parent's own _ready() chain (forced once right after the fleet
|
||
|
|
# is positioned, to avoid a pop-in on scene load) - Godot refuses
|
||
|
|
# a direct add_child() while the tree is still "busy setting up
|
||
|
|
# children" in that situation, so this must be deferred either way.
|
||
|
|
get_parent().add_child.call_deferred(asteroid)
|
||
|
|
spawned.append(asteroid)
|
||
|
|
|
||
|
|
populated_chunks[chunk] = spawned
|