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60 lines
1.2 KiB
GDScript
60 lines
1.2 KiB
GDScript
extends Node
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class_name Conductor
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# The Conductor (optionally) plays a song, and sends signals based on the beats of the song.
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# The beats per minute of the song
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export(float, 1, 500) var song_bpm: float = 120
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# Microseconds of silence present in the song
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export(float, 0, 1000000) var song_offset: float = 0
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# The time the song started playing at
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var start_time: int
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# The time of the last beat
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var last_beat: int
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# A song beat
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signal beat
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# Calculate the microseconds per beat
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func usec_per_beat():
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return 60000000 / song_bpm
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# Returns microseconds since the song start
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func song_time():
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var current_time: int = OS.get_ticks_usec()
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return current_time - start_time
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# Return corrected microseconds (after applying the offset) since the song start
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func corrected_time():
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var song_time = song_time()
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return song_time - song_offset
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# Start playing the song
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func play():
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start_time = OS.get_ticks_usec()
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$Music.play()
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# Signal that a beat has happened
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func beat():
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pass
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func _ready():
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play()
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func _process(delta):
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var time = corrected_time()
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if time - last_beat >= usec_per_beat():
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emit_signal("beat")
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last_beat = time
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func _on_Conductor_beat():
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print("Beat! %f" % song_time())
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