class_name GameViewportContainer extends SubViewportContainer
## SubViewportContainer with game-specific special effects

var _screen_shake_intensity: float = 0.0

@onready var root_control: Control = %RootControl


## Start playing a screen shake effect.
func screen_shake(intensity: float, duration: float = 0.2) -> void:
	var tween := get_tree().create_tween()
	_screen_shake_intensity = intensity
	tween.tween_property(self, "_screen_shake_intensity", 0.0, duration).set_trans(
		Tween.TRANS_CUBIC
	)
	tween.tween_callback(_reset_position)


func _reset_position() -> void:
	position = Vector2.ZERO


func _process(_delta: float) -> void:
	if _screen_shake_intensity > 0:
		position.x = randfn(0, _screen_shake_intensity)
		position.y = randfn(0, _screen_shake_intensity)