private void shiftNote(NotePos note, List<NotePos> mergedNotePositions, int index) {
NotePos prevOrNextNote = mergedNotePositions.get(index);
if (prevOrNextNote.getVoice() != note.getVoice()) {
int prevOrNextPosition = prevOrNextNote.getPosition();
int notePosition = note.getPosition();
int length = Math.abs(notePosition - prevOrNextPosition);
if (length > MIN_LENGTH && (length % 2) == 0) { // divisable by 2
note.setPosition(notePosition + (length / 2));
System.out.println("shift");
} else {
note.setPosition(prevOrNextPosition);
}
}
}
/**
* Perform the mutation operation
*
* @param probability Mutation probability
* @param solution The solution to mutate
* @throws JMException
*/
public void doMutation(double probability, Solution solution) throws JMException {
if (PseudoRandom.randDouble() < probability) {
List<Partition> partitions =
((MusicVariableAtonal) solution.getDecisionVariables()[0]).getPartitions();
int s = partitions.size() - 1;
int melodyIndex = PseudoRandom.randInt(0, s);
Partition partition = partitions.get(melodyIndex);
List<NotePos> notePositions = partition.getNotes();
int startPartition = partition.getPosition();
int endPartition = startPartition + partition.getLength();
if (!notePositions.isEmpty() && notePositions.size() > 1) {
int position = PseudoRandom.randInt(0, notePositions.size() - 1);
NotePos note = notePositions.get(position);
int index = notePositions.indexOf(note);
if (random.nextBoolean()) {
if (index >= 1) {
NotePos prevNote = notePositions.get(index - 1);
if (prevNote.getVoice() != note.getVoice()) {
// int prevPosition = prevNote.getPosition();
int notePosition = note.getPosition();
if (!containsNoteAtPosition(notePositions, notePosition - MIN_LENGTH)
&& startPartition <= notePosition - MIN_LENGTH) {
note.setPosition(notePosition - MIN_LENGTH);
System.out.println("Shifted");
}
}
}
} else {
if (index < notePositions.size() - 1) {
NotePos nextNote = notePositions.get(index + 1);
if (nextNote.getVoice() != note.getVoice()) {
// int nextPosition = nextNote.getPosition();
int notePosition = note.getPosition();
if (!containsNoteAtPosition(notePositions, notePosition + MIN_LENGTH)
&& notePosition + MIN_LENGTH <= endPartition) {
note.setPosition(notePosition + MIN_LENGTH);
System.out.println("Shifted");
}
}
}
}
}
}
}