class_name Explosion
extends Node2D
## 爆炸特效：双火球缩放淡出后自动回收。

const TEX := preload("res://assets/svg/explosion.svg")

var size := 1.0

var _core: Sprite2D
var _ring: Sprite2D


func _ready() -> void:
	_core = Sprite2D.new()
	_core.texture = TEX
	_core.scale = Vector2(0.2, 0.2) * size
	add_child(_core)

	_ring = Sprite2D.new()
	_ring.texture = TEX
	_ring.scale = Vector2(0.55, 0.55) * size
	_ring.modulate = Color(1.0, 0.55, 0.25, 0.9)
	add_child(_ring)

	var tween := create_tween()
	tween.set_parallel(true)
	tween.tween_property(_core, "scale", Vector2(1.5, 1.5) * size, 0.3) \
		.set_trans(Tween.TRANS_CUBIC).set_ease(Tween.EASE_OUT)
	tween.tween_property(_core, "modulate:a", 0.0, 0.38)
	tween.tween_property(_ring, "scale", Vector2(2.6, 2.6) * size, 0.42) \
		.set_trans(Tween.TRANS_QUAD).set_ease(Tween.EASE_OUT)
	tween.tween_property(_ring, "modulate:a", 0.0, 0.42)
	tween.chain().tween_callback(queue_free)