khodowany
39 lines
2.0 KiB
Python
39 lines
2.0 KiB
Python
"""Exact notated attacks used to compare arrangements; no audio rendering."""
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import fractions
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import generator.model
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import generator.pitch
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def timeline(document):
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events, linked = [], {}
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absolute = fractions.Fraction()
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for measure in document['staves'][0]['measures']:
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for voice in measure['voices']:
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state = {key: measure[key] for key in ('transpose', 'clef', 'staff_details')}
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changes = iter(sorted(measure.get('attributes', []), key=lambda a: generator.model.fraction(a['onset'])))
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change = next(changes, None)
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for note in voice['notes']:
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onset = generator.model.fraction(note['onset'])
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while change is not None and generator.model.fraction(change['onset']) <= onset:
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state.update({key: change[key] for key in state if key in change})
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change = next(changes, None)
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if note.get('cue') or note.get('grace'):
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continue
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for pitch in note['pitches']:
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if pitch.get('cue'):
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continue
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length = generator.model.fraction(pitch['duration'])
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value = generator.pitch.sounding_pitch(pitch, state)
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if pitch.get('tie_from'):
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previous = linked[pitch['tie_from']]
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assert generator.model.fraction(previous['onset']) + generator.model.fraction(previous['duration']) == absolute + onset
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assert generator.model.fraction(previous['pitch']) == value
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previous['duration'] = generator.model.rational(generator.model.fraction(previous['duration']) + length)
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linked[pitch['id']] = previous
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else:
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event = dict(id=pitch['id'], pitch=generator.model.rational(value), onset=generator.model.rational(absolute + onset), duration=generator.model.rational(length))
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events.append(event)
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linked[pitch['id']] = event
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absolute += generator.model.fraction(measure['duration'])
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events.sort(key=lambda e: (generator.model.fraction(e['onset']), e['id']))
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return dict(duration=generator.model.rational(absolute), events=events)
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