class_name HudInstrument
extends Control

# Shared base for the HUD's procedural instruments (heading tape, attitude
# indicator, gauges): the exponential-smoothing weight calc and the
# angle-aware lerp helper they all use. Each instrument still owns its own
# _process (smoothing 1-2 distinct fields) and _draw (entirely bespoke).

const SMOOTHING := 12.0


static func lerp_angle_deg(from: float, to: float, weight: float) -> float:
	return rad_to_deg(lerp_angle(deg_to_rad(from), deg_to_rad(to), weight))


func _smoothing_weight(delta: float) -> float:
	return 1.0 - exp(-SMOOTHING * delta)  # frame-rate independent