extends Node2D


const VU_COUNT=16
const FREQ_MAX = 11050.0

const WIDTH = 400
const HEIGHT = 100

const MIN_DB = 60

var spectrum

func _draw():
		
	var w = WIDTH / VU_COUNT
	var prev_hz = 0
	for i in range(1,VU_COUNT+1):	
		var hz = i * FREQ_MAX / VU_COUNT;
		var f = spectrum.get_magnitude_for_frequency_range(prev_hz,hz)
		var energy = clamp((MIN_DB + linear2db(f.length()))/MIN_DB,0,1)
		#print("db ",db,": ",f.length())
		var height = energy * HEIGHT
		draw_rect(Rect2(w*i,HEIGHT-height,w,height),Color(1,1,1))
		prev_hz = hz
	

func _process(delta):
	update()

func _ready():
	spectrum = AudioServer.get_bus_effect_instance(0,0)

# Called every frame. 'delta' is the elapsed time since the previous frame.
#func _process(delta):
#	pass