/*
* 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.Random;
import jm.JMC;
import jm.music.data.Note;
import jm.music.data.Part;
import jm.music.data.Phrase;
import jm.music.data.Rest;
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.model.SpecialNoteType;
import com.music.util.music.Chance;
import com.music.util.music.NoteFactory;
public class BassPartGenerator implements ScoreManipulator {
private static Random random = new Random();
@Override
public void handleScore(Score score, ScoreContext ctx) {
Part bassPart = ctx.getParts().get(PartType.BASS);
if (bassPart == null) {
return;
}
Part mainPart = ctx.getParts().get(PartType.MAIN);
int degreePercentages[] = new int[]{27, 13, 21, 6, 19, 10, 4};
int dullBassPercentages[] = new int[]{45, 11, 22, 0, 22, 0, 0};
boolean dullBass = Chance.test(38);
ctx.setDullBass(dullBass);
Phrase[] phrases = mainPart.getPhraseArray();
double durationModifier = Chance.test(30) ? SpecialNoteType.STACCATO.getValue() : 0;
for (Phrase phrase : phrases) {
ExtendedPhrase extPhrase = ((ExtendedPhrase) phrase);
Scale currentScale = extPhrase.getScale();
if (currentScale.getDefinition().length != 7) { //no bass for irregular scales, for now
continue;
}
Phrase bassPhrase = new Phrase();
for (int i = 0; i < extPhrase.getMeasures(); i++) {
for (int k = 0; k < 2; k++) {
if (Chance.test(70)) {
int degreeIdx = 0;
if (dullBass) {
degreeIdx = Chance.choose(dullBassPercentages);
} else {
degreeIdx = Chance.choose(degreePercentages);
}
Note note = NoteFactory.createNote(JMC.C3 + ctx.getKeyNote() + currentScale.getDefinition()[degreeIdx], ctx.getNormalizedMeasureSize() / 2);
note.setDynamic(InstrumentGroups.getInstrumentSpecificDynamics(60 + random.nextInt(15), bassPart.getInstrument()));
if (durationModifier > 0) {
note.setDuration(note.getRhythmValue() * durationModifier);
}
bassPhrase.addNote(note);
} else {
bassPhrase.addRest(new Rest(ctx.getNormalizedMeasureSize() / 2));
}
}
}
bassPart.addPhrase(bassPhrase);
}
}
}