/*
* Computoser is a music-composition algorithm and a website to present the results
* Copyright (C) 2012-2014 Bozhidar Bozhanov
*
* Computoser is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* Computoser is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with Computoser. If not, see <http://www.gnu.org/licenses/>.
*/
package com.music;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Random;
import jm.constants.Pitches;
import jm.music.data.Note;
import jm.music.data.Part;
import jm.music.data.Phrase;
import jm.music.data.Score;
import com.music.model.ExtendedPhrase;
import com.music.model.InstrumentGroups;
import com.music.model.PartType;
import com.music.model.Scale;
import com.music.util.music.Chance;
import com.music.util.music.NoteFactory;
public class DroneGenerator implements ScoreManipulator {
private final Random random = new Random();
@Override
public void handleScore(Score score, ScoreContext ctx) {
Part dronePart = ctx.getParts().get(PartType.DRONE);
if (dronePart == null) {
return;
}
Note[] droneNotes = null;
Part mainPart = ctx.getParts().get(PartType.MAIN);
Phrase[] phrases = mainPart.getPhraseArray();
for (Phrase phrase : phrases) {
Phrase dronePhrase = new Phrase();
if (!(phrase instanceof ExtendedPhrase) || Chance.test(17)) { // skip the drone for some phrases
continue;
}
ExtendedPhrase ePhrase = (ExtendedPhrase) phrase;
// change the drone type
if (droneNotes == null || ePhrase.getScale() == ctx.getAlternativeScale() || Chance.test(10)) {
droneNotes = getDroneNotes(ePhrase.getScale(), ctx.getKeyNote(), ctx.getNormalizedMeasureSize(), ePhrase.getMeasures(), dronePart.getInstrument());
}
// if one note is held the entire time;
if (droneNotes.length == 1) {
dronePhrase.addNote(droneNotes[0]);
} else {
for (int i = 0; i < ePhrase.getMeasures(); i++) {
dronePhrase.addNoteList(droneNotes);
}
}
dronePart.add(dronePhrase);
}
}
private Note[] getDroneNotes(Scale scale, int keyNote, double normalizedMeasureSize, int measures, int instrument) {
boolean singleNote = Chance.test(30);
boolean hold = Chance.test(20);
int notesPerMeasure = (int) Math.pow(2, 0 + random.nextInt(4));
List<Note> notes = new ArrayList<>();
double noteLength = normalizedMeasureSize / notesPerMeasure;
if (singleNote && hold) {
Note note = NoteFactory.createNote(Pitches.C5 + keyNote, normalizedMeasureSize * measures);
note.setDynamic(InstrumentGroups.getInstrumentSpecificDynamics(55, instrument));
notes.add(note);
} else if (singleNote) {
for (int i = 0; i < notesPerMeasure; i++) {
Note note = NoteFactory.createNote(Pitches.C5 + keyNote, noteLength);
note.setDynamic(InstrumentGroups.getInstrumentSpecificDynamics(55, instrument));
notes.add(note);
}
} else {
int pitch = Pitches.C5 + keyNote;
for (int i = 0; i < notesPerMeasure; i++) {
Note note = NoteFactory.createNote(pitch, noteLength);
note.setDynamic(InstrumentGroups.getInstrumentSpecificDynamics(50, instrument));
notes.add(note);
boolean directionUp = random.nextBoolean();
int step = random.nextInt(3);
int toneDegree = Arrays.binarySearch(scale.getDefinition(), pitch % 12);
if (toneDegree > 0) {
pitch = Pitches.C5 + keyNote + (directionUp ? 1 : -1) * scale.getDefinition()[(toneDegree + step) % 7];
} else {
pitch = Pitches.c5 + keyNote;
}
}
}
return notes.toArray(new Note[notes.size()]);
}
}