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"""
Elements that can be inserted by MIDI events
"""
from PyQt5.QtCore import Qt
from PyQt5.QtWidgets import QApplication
import ly.pitch
class Note:
LastPitch = ly.pitch.Pitch()
def __init__(self, midinote, notemapping):
# get correct note 0...11 = c...b
# and octave corresponding to octave modifiers ',' & '''
self._midinote = midinote
octave, note = divmod(midinote, 12)
octave -= 4
self._pitch = ly.pitch.Pitch(notemapping[note][0] % 7, notemapping[note][1], octave + notemapping[note][0] // 7)
def output(self, relativemode=False, language='nederlands'):
if relativemode:
pitch = self._pitch.copy()
pitch.makeRelative(Note.LastPitch)
Note.LastPitch.note = self._pitch.note
Note.LastPitch.octave = self._pitch.octave
else:
pitch = self._pitch
# also octavecheck if Shift is held
return pitch.output(language) + (('='+ly.pitch.octaveToString(self._pitch.octave)) if QApplication.keyboardModifiers() & Qt.SHIFT else '')
def midinote(self):
return self._midinote
class Chord(object):
def __init__(self):
self._notes = list()
def add(self, note):
self._notes.append(note)
def output(self, relativemode=False, language='nederlands'):
if len(self._notes) == 1: # only one note, no chord
return self._notes[0].output(relativemode, language)
else: # so we have a chord, print <chord>
sortednotes = sorted(self._notes, key=lambda note: note.midinote())
chord = ''
# temporary variables, to reset LastPitch after this chord
lastnote = sortednotes[0]._pitch.note
lastoctave = sortednotes[0]._pitch.octave
for n in sortednotes:
chord += n.output(relativemode, language) + ' '
Note.LastPitch.note = lastnote
Note.LastPitch.octave = lastoctave
return '<' + chord[:-1] + '>' # strip last space
class NoteMappings:
def to_sharp(self, note, alteration):
if alteration==0.5:
return (note, alteration)
return (note-1, 0.5)
def to_flat(self, note, alteration):
if alteration==-0.5:
return (note, alteration)
return (note+1, -0.5)
def __init__(self):
self.key_order_sharp = [6, 1, 8, 3, 10, 5, 0]
self.key_order_flat = [10, 3, 8, 1, 6, 11, 4]
# Transform: midinote (0-11) -> (note, accidental)
self.sharps = [(0, 0), # c
(0, 0.5), # cis
(1, 0), # d
(1, 0.5), # dis
(2, 0), # e
(3, 0), # f
(3, 0.5), # fis
(4, 0), # g
(4, 0.5), # gis
(5, 0), # a
(5, 0.5), # ais
(6, 0)] # b
self.flats = [(0, 0), # c
(1, -0.5), # des
(1, 0), # d
(2, -0.5), # es
(2, 0), # e
(3, 0), # f
(4, -0.5), # ges
(4, 0), # g
(5, -0.5), # aes
(5, 0), # a
(6, -0.5), # bes
(6, 0)] # b
# Construct all possible mappings using some replacement logic
# 7 flats, ... 1 flats, 0, 1 sharp, ..., 7 sharps
self.sharp_mappings = []
self.flat_mappings = []
for i in range(len(self.key_order_flat)-1, -1, -1):
flatmap = list(self.flats) # copy existing list
sharpmap = list(self.sharps) # copy existing list
for k in self.key_order_flat[:i+1]:
flatmap[k] = self.to_flat(*flatmap[k])
sharpmap[k] = self.to_flat(*sharpmap[k])
self.flat_mappings.append(flatmap)
self.sharp_mappings.append(sharpmap)
self.sharp_mappings.append(self.sharps) # Append C major signature -> no key alteration
self.flat_mappings.append(self.flats) # Append C major signature -> no key alteration
for i in range(len(self.key_order_sharp)):
flatmap = list(self.flats) # copy existing list
sharpmap = list(self.sharps) # copy existing list
for k in self.key_order_sharp[:i+1]:
flatmap[k] = self.to_sharp(*flatmap[k])
sharpmap[k] = self.to_sharp(*sharpmap[k])
self.flat_mappings.append(flatmap)
self.sharp_mappings.append(sharpmap)
class NoteMapping:
mappings = NoteMappings()
def __init__(self, keysignature, sharps=True):
if sharps:
self.mapping = NoteMapping.mappings.sharp_mappings[keysignature]
else:
self.mapping = NoteMapping.mappings.flat_mappings[keysignature]
def __len__(self):
return len(self.mapping)
def __getitem__(self, index):
return self.mapping[index]
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