def generateFirstSpecies(self, stream1, minorScale):
'''Given a stream (the cantus firmus) and the stream's key in the
form of a MinorScale object, generates a stream of first species
counterpoint that follows the rules of 21M.301.'''
# DOES NOT YET CHECK FOR TOO MANY THIRDS/SIXTHS IN A ROW,
# DOES NOT YET RAISE LEADING TONES, AND DOES NOT CHECK FOR NOODLING.
stream2 = Stream([])
firstNote = stream1.notes[0]
choices = [interval.transposeNote(firstNote, "P1"),\
interval.transposeNote(firstNote, "P5"),\
interval.transposeNote(firstNote, "P8")]
note1 = random.choice(choices)
note1.duration = firstNote.duration
stream2.append(note1)
afterLeap = False
for i in range(1, len(stream1.notes)):
prevFirmus = stream1.notes[i-1]
currFirmus = stream1.notes[i]
prevNote = stream2.notes[i-1]
choices = self.generateValidNotes(prevFirmus, currFirmus, prevNote, afterLeap, minorScale)
if len(choices) == 0:
raise ModalCounterpointException("Sorry, please try again")
newNote = random.choice(choices)
newNote.duration = currFirmus.duration
stream2.append(newNote)
int = interval.notesToInterval(prevNote, newNote)
if int.generic.undirected > 3: afterLeap = True
else: afterLeap = False
return stream2
def raiseLeadingTone(self, stream1, minorScale):
'''Given a stream of notes and a minor scale object, returns a new
stream that raises all the leading tones of the original stream. Also
raises the sixth if applicable to avoid augmented intervals.'''
notes2 = stream1.notes[:]
stream2 = Stream(notes2)
sixth = minorScale.pitchFromScaleDegree(6).name
seventh = minorScale.pitchFromScaleDegree(7).name
tonic = minorScale.getTonic().name
for i in range(len(stream1.notes)-2):
note1 = stream1.notes[i]
note2 = stream1.notes[i+1]
note3 = stream1.notes[i+2]
if note1 is not None and note2 is not None and note3 is not None:
if note1.name == sixth and note2.name == seventh and note3.name == tonic:
newNote1 = interval.transposeNote(note1, "A1")
newNote2 = interval.transposeNote(note2, "A1")
stream2.notes[i] = newNote1
stream2.notes[i+1] = newNote2
for i in range(len(stream1.notes)-1):
note1 = stream1.notes[i]
note2 = stream1.notes[i+1]
if note1 is not None and note2 is not None:
if note1.name == seventh and note2.name == tonic:
newNote = interval.transposeNote(note1, "A1")
stream2.notes[i] = newNote
return stream2
def parseData(self, sounding, qL=2, splitNote="C4"):
theSound = sounding.IntervallStruktur
bassnotes = list(sounding.Bassnoten)
bassschritte = sounding.Bassschritte
followingSoundings = []
for bs in bassschritte:
for syz in bassschritte[bs]:
followingSoundings.append((bs, syz))
#print(followingSoundings)
bass = note.Note(bassnotes[0])
bass.quarterLength = qL
for each in followingSoundings:
self._distributeNotes2VocalScore(theSound, bass, splitNote)
secondBass = interval.transposeNote(bass, each[0])
self._distributeNotes2VocalScore(each[1], secondBass, splitNote)
def _distributeNotes2VocalScore(self,
listOfIntervals,
bassNote,
splitNote="C4"):
cpBass = deepcopy(bassNote)
if bassNote.pitch >= pitch.Pitch(splitNote):
self.part1.append(cpBass)
else:
self.part2.append(cpBass)
#offset setzen
offset = cpBass.offset
#Akkorde hinzusetzen
for intv in listOfIntervals:
#print(intv)
nNew = interval.transposeNote(bassNote, intv)
if nNew.pitch >= pitch.Pitch(splitNote):
self.part1.insert(offset, nNew)
else:
self.part2.insert(offset, nNew)
def generateValidNotes(self, prevFirmus, currFirmus, prevNote, afterLeap, minorScale):
'''Helper function for generateFirstSpecies; gets a list of possible
next notes based on valid melodic intervals, then checks each one so
that parallel/hidden fifths/octaves, voice crossing, and invalid
harmonies are prevented. Adds extra weight to notes that would create
contrary motion.'''
print currFirmus.name
valid = []
bottomInt = interval.notesToInterval(prevFirmus, currFirmus)
if bottomInt.direction < 0: ascending = True
else: ascending = False
n1 = interval.transposeNote(prevNote, "m2")
n2 = interval.transposeNote(prevNote, "M2")
n3 = interval.transposeNote(prevNote, "m3")
n4 = interval.transposeNote(prevNote, "M3")
n5 = interval.transposeNote(prevNote, "P4")
n6 = interval.transposeNote(prevNote, "P5")
if afterLeap: possible = [n1, n2, n3, n4]
else: possible = [n1, n2, n3, n4, n5, n6]
possible.extend(possible)
n7 = interval.transposeNote(prevNote, "m-2")
n8 = interval.transposeNote(prevNote, "M-2")
n9 = interval.transposeNote(prevNote, "m-3")
n10 = interval.transposeNote(prevNote, "M-3")
n11 = interval.transposeNote(prevNote, "P-4")
n12 = interval.transposeNote(prevNote, "P-5")
if afterLeap: possible.extend([n7, n8, n9, n10])
else: possible.extend([n7, n8, n9, n10, n11, n12])
print "possible: ", [note1.name for note1 in possible]
for note1 in possible:
try: validHarmony = self.isValidHarmony(note1, currFirmus)
except: validHarmony = False
# vlq = VoiceLeadingQuartet(prevNote, prevFirmus, note1, currFirmus)
# par5 = vlq.parallelFifth()
# par8 = vlq.parallelOctave()
# hid5 = vlq.hiddenFifth()
# hid8 = vlq.hiddenOctave()
# par1 = vlq.parallelUnison()
try: par5 = self.isParallelFifth(prevNote, note1, prevFirmus, currFirmus)
except: par5 = True
try: par8 = self.isParallelOctave(prevNote, note1, prevFirmus, currFirmus)
except: par8 = True
try: hid5 = self.isHiddenFifth(prevNote, note1, prevFirmus, currFirmus)
except: hid5 = True
try: hid8 = self.isHiddenOctave(prevNote, note1, prevFirmus, currFirmus)
except: hid8 = True
try: par1 = self.isParallelUnison(prevNote, note1, prevFirmus, currFirmus)
except: par1 = True
try:
distance = interval.notesToInterval(currFirmus, note1)
if distance.direction < 0: crossing = True
else: crossing = False
except: crossing = True
goodNotes = minorScale.getConcreteMelodicMinorScale()
goodNames = [note2.name for note2 in goodNotes]
if validHarmony and (not par5) and (not par8) and (not hid5) and\
(not hid8) and (not par1) and (not crossing):
if note1.name in goodNames:
print "adding: ", note1.name, note1.octave
valid.append(note1)
print
return valid
