spaceship/vfx/AsteroidExplosionVFX.gd

class_name AsteroidExplosionVFX
extends ExplosionVFXBase

# Tumbling rock-chunk debris, distinct from the energy-ship light-burst
# style - asteroids are matter, not light.

const COLOR: Color = Color(0.65, 0.5, 0.35)


func _init() -> void:
	# #152: this took the base class's defaults - 12 chunks over half a
	# second, no shockwave - which is why breaking a rock, the thing the
	# player does more than anything else in the game, barely registered.
	# Matter rather than light, so it throws more and slower than an energy
	# burst does, and its shockwave is dust rather than a flash.
	particle_count = 24
	lifetime = 0.7
	min_speed = 70.0
	max_speed = 330.0
	shockwave_radius = 72.0
	shockwave_color = Color(0.72, 0.6, 0.44)


static func spawn(parent: Node, world_position: Vector2) -> void:
	var vfx: AsteroidExplosionVFX = AsteroidExplosionVFX.new()
	vfx.position = world_position
	parent.add_child(vfx)


func _random_particle_size() -> float:
	return randf_range(4.0, 11.0)


# Debris tumbles independently of its flight path, unlike the light-burst
# streaks - each chunk needs its own evolving rotation, so the base class
# must keep writing visual.rotation every frame instead of leaving it fixed.
func _particle_spins() -> bool:
	return true


func _configure_particle(visual: ExplosionParticle, p: Dictionary) -> void:
	var s: float = p["size"]
	# Unrotated local points - the child node's own `rotation` (driven by
	# the base class from p["rot"]) supplies the tumble that used to be
	# baked into a fresh pt.rotated(p["rot"]) call every frame.
	var local_pts: PackedVector2Array = PackedVector2Array([
		Vector2(-s, -s * 0.6), Vector2(s * 0.7, -s * 0.5),
		Vector2(s, s * 0.5), Vector2(-s * 0.6, s),
	])
	visual.draw_callable = func(item: CanvasItem) -> void:
		item.draw_colored_polygon(local_pts, COLOR)