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Code Issues Packages Projects Releases Wiki Activity

Make animations smoother in Audio Spectrum demo (#972)

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This commit is contained in:
Alex
2023-10-18 01:31:12 +02:00
committed by GitHub
parent ce4600350e
commit 7e43dbf64b
2 changed files with 38 additions and 13 deletions
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6
audio/spectrum/project.godot
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@@ -12,17 +12,17 @@ config_version=5
config/name="Audio Spectrum Demo" config/name="Audio Spectrum Demo"
config/description="This is a demo showing how a spectrum analyzer can be built using Godot." config/description="This is a demo showing how a spectrum analyzer can be built using Godot."
config/tags=PackedStringArray("audio", "demo", "official", "visualization")
run/main_scene="res://show_spectrum.tscn" run/main_scene="res://show_spectrum.tscn"
config/features=PackedStringArray("4.0") config/features=PackedStringArray("4.1")
run/low_processor_mode=true run/low_processor_mode=true
config/icon="res://icon.webp" config/icon="res://icon.webp"
config/tags=PackedStringArray("audio", "demo", "official", "visualization")
[display] [display]
window/vsync/vsync_mode=0
window/stretch/mode="canvas_items" window/stretch/mode="canvas_items"
window/stretch/aspect="expand" window/stretch/aspect="expand"
window/vsync/vsync_mode=0
[rendering] [rendering]

45
audio/spectrum/show_spectrum.gd
View File

@@ -1,24 +1,27 @@
extends Node2D extends Node2D
const VU_COUNT = 16 const VU_COUNT = 16
const FREQ_MAX = 11050.0 const FREQ_MAX = 11050.0
const WIDTH = 800 const WIDTH = 800
const HEIGHT = 250 const HEIGHT = 250
const HEIGHT_SCALE = 8.0
const MIN_DB = 60 const MIN_DB = 60
const ANIMATION_SPEED = 0.1
var spectrum var spectrum
var min_values = []
var max_values = []
func _draw(): func _draw():
@warning_ignore("integer_division")
var w = WIDTH / VU_COUNT var w = WIDTH / VU_COUNT
var prev_hz = 0 for i in range(VU_COUNT):
for i in range(1, VU_COUNT + 1): var min_height = min_values[i]
var hz = i * FREQ_MAX / VU_COUNT var max_height = max_values[i]
var magnitude = spectrum.get_magnitude_for_frequency_range(prev_hz, hz).length() var height = lerp(min_height, max_height, ANIMATION_SPEED)
var energy = clampf((MIN_DB + linear_to_db(magnitude)) / MIN_DB, 0, 1)
var height = energy * HEIGHT
draw_rect( draw_rect(
Rect2(w * i, HEIGHT - height, w - 2, height), Rect2(w * i, HEIGHT - height, w - 2, height),
Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 0.6) Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 0.6)
@@ -44,13 +47,35 @@ func _draw():
true true
) )
prev_hz = hz
func _process(_delta): func _process(_delta):
var data = []
var prev_hz = 0
for i in range(1, VU_COUNT + 1):
var hz = i * FREQ_MAX / VU_COUNT
var magnitude = spectrum.get_magnitude_for_frequency_range(prev_hz, hz).length()
var energy = clampf((MIN_DB + linear_to_db(magnitude)) / MIN_DB, 0, 1)
var height = energy * HEIGHT * HEIGHT_SCALE
data.append(height)
prev_hz = hz
for i in range(VU_COUNT):
if data[i] > max_values[i]:
max_values[i] = data[i]
else:
max_values[i] = lerp(max_values[i], data[i], ANIMATION_SPEED)
if data[i] <= 0.0:
min_values[i] = lerp(min_values[i], 0.0, ANIMATION_SPEED)
# Sound plays back continuously, so the graph needs to be updated every frame. # Sound plays back continuously, so the graph needs to be updated every frame.
queue_redraw() queue_redraw()
func _ready(): func _ready():
spectrum = AudioServer.get_bus_effect_instance(0, 0) spectrum = AudioServer.get_bus_effect_instance(0, 0)
min_values.resize(VU_COUNT)
max_values.resize(VU_COUNT)
min_values.fill(0.0)
max_values.fill(0.0)