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0343cedd48
* General proofreading for grammar and spelling * General formatting * Addition of appropriate literals where appropriate, i.e. `&"foo"` for `StringName` cases and `^"foo/bar"` for `NodePath` cases
81 lines
2.1 KiB
GDScript
81 lines
2.1 KiB
GDScript
extends Node2D
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const VU_COUNT = 16
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const FREQ_MAX = 11050.0
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const WIDTH = 800
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const HEIGHT = 250
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const HEIGHT_SCALE = 8.0
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const MIN_DB = 60
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const ANIMATION_SPEED = 0.1
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var spectrum: AudioEffectSpectrumAnalyzerInstance
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var min_values: Array[float] = []
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var max_values: Array[float] = []
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func _draw() -> void:
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@warning_ignore("integer_division")
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var w := WIDTH / VU_COUNT
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for i in VU_COUNT:
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var min_height = min_values[i]
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var max_height = max_values[i]
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var height = lerp(min_height, max_height, ANIMATION_SPEED)
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draw_rect(
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Rect2(w * i, HEIGHT - height, w - 2, height),
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Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 0.6)
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)
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draw_line(
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Vector2(w * i, HEIGHT - height),
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Vector2(w * i + w - 2, HEIGHT - height),
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Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 1.0),
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2.0,
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true
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)
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# Draw a reflection of the bars with lower opacity.
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draw_rect(
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Rect2(w * i, HEIGHT, w - 2, height),
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Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 0.6) * Color(1, 1, 1, 0.125)
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)
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draw_line(
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Vector2(w * i, HEIGHT + height),
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Vector2(w * i + w - 2, HEIGHT + height),
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Color.from_hsv(float(VU_COUNT * 0.6 + i * 0.5) / VU_COUNT, 0.5, 1.0) * Color(1, 1, 1, 0.125),
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2.0,
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true
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)
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func _process(_delta: float) -> void:
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var data: Array[float] = []
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var prev_hz := 0.0
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for i in range(1, VU_COUNT + 1):
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var hz := i * FREQ_MAX / VU_COUNT
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var magnitude := spectrum.get_magnitude_for_frequency_range(prev_hz, hz).length()
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var energy := clampf((MIN_DB + linear_to_db(magnitude)) / MIN_DB, 0, 1)
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var height := energy * HEIGHT * HEIGHT_SCALE
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data.append(height)
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prev_hz = hz
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for i in VU_COUNT:
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if data[i] > max_values[i]:
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max_values[i] = data[i]
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else:
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max_values[i] = lerpf(max_values[i], data[i], ANIMATION_SPEED)
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if data[i] <= 0.0:
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min_values[i] = lerpf(min_values[i], 0.0, ANIMATION_SPEED)
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# Sound plays back continuously, so the graph needs to be updated every frame.
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queue_redraw()
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func _ready() -> void:
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spectrum = AudioServer.get_bus_effect_instance(0, 0)
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min_values.resize(VU_COUNT)
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max_values.resize(VU_COUNT)
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min_values.fill(0.0)
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max_values.fill(0.0)
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