a

GonerBG.gd

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+extends Node
+
+@onready var layer = $GonerLayer
+
+var layers: Array = []
+var timer: float = 0.0
+const INTERVAL: float = 2
+const START_SCALE: float = 4.5
+const END_SCALE: float = 8.0
+const DURATION: float = 10.0
+
+func _ready() -> void:
+	layer.visible = false
+
+func _process(delta: float) -> void:
+	timer += delta
+	if timer >= INTERVAL:
+		timer -= INTERVAL
+		_spawn_layer()
+
+	var i: int = layers.size() - 1
+	while i >= 0:
+		var entry = layers[i]
+		entry["elapsed"] += delta
+		var t: float = clampf(entry["elapsed"] / DURATION, 0.0, 1)
+		var node: Node2D = entry["node"]
+		node.scale = Vector2(lerpf(START_SCALE, END_SCALE, t), lerpf(START_SCALE, END_SCALE, t))
+		node.modulate.a = sin(t * PI) * 0.5
+		if t >= 1.0:
+			node.queue_free()
+			layers.remove_at(i)
+		i -= 1
+
+func _spawn_layer() -> void:
+	var clone: Node2D = layer.duplicate()
+	clone.visible = true
+	clone.scale = Vector2(START_SCALE, START_SCALE)
+	clone.modulate = Color(1, 1, 1, 0)
+	layer.get_parent().add_child(clone)
+	layer.get_parent().move_child(clone, layer.get_index())
+	layers.push_back({"node": clone, "elapsed": 0.0})