def get_notes_from_root(cls,
root,
note_list_type=None,
octave=None,
alt=Note.SHARP):
"""
:param root: root note
:param note_list_type: a list of notes distance from root note
:param octave: octave of notes in chord
:param alt: note alteration 'sharp' or 'flat'
:type root: Note
:type note_list_type: list
:type octave: Union[int, string, callable]
:type alt: string
:return: Scale
"""
if note_list_type is None:
raise NoteListException('Invalid note list type')
if octave is None:
octave = cls.OCTAVE_TYPE_ROOT
root_idx = root.get_note_index()
def get_octave(i, distance):
if callable(octave):
return octave(root.octave, i, distance)
elif isinstance(octave, int):
return octave
elif octave == cls.OCTAVE_TYPE_ROOT:
return root.octave
elif octave == cls.OCTAVE_TYPE_FROM_ROOT:
return root.octave + int(distance / len(Note.NOTES))
else:
return Note.A_DEFAULT_OCTAVE
notes = [
Note(name=Note.get_note_name_by_index(root_idx + distance,
alt=alt),
octave=get_octave(i, root_idx + distance),
alt=alt) for i, distance in enumerate(note_list_type)
]
notes.insert(0, root)
return notes
def test_get_note_name_by_index():
assert Note.get_note_name_by_index(0) == 'C'
assert Note.get_note_name_by_index(1) == 'C#'
assert Note.get_note_name_by_index(1, alt=Note.FLAT) == 'Db'
assert Note.get_note_name_by_index(12) == 'C'
assert Note.get_note_name_by_index(26) == 'D'