Various patches for LMMS like randomize() patterns, colors, etc.

randomize-patterns.cpp

// work in progress | help required

void PatternEditor::randomizePatterns()
{	
	TrackContainer::TrackList tl = model()->tracks();

	// @todo Skip counting unsunpported tracks
	int tracks = tl.size();
	if(tracks>24)
	{
		QMessageBox warning;
		warning.setText("Too many instruments in the track!");
		warning.setWindowTitle("Possible slow down!");
		warning.setStandardButtons(QMessageBox::Ok | QMessageBox::Cancel);
		warning.setDefaultButton(QMessageBox::Cancel);
		if(warning.exec() != QMessageBox::Ok)
		{
			return;
		}
	}

	QApplication::setOverrideCursor(Qt::WaitCursor);
	QCoreApplication::processEvents();

	QList<Track::Type> allowed = {
		Track::Type::Instrument,
		Track::Type::Pattern,
	};

	std::random_device rd;
	std::seed_seq ss{rd(), rd(), rd(), rd(), rd(), rd(), rd(), rd()};
	std::mt19937 generator(ss);
	std::uniform_int_distribution<int> dist1(0, 10);
	std::uniform_int_distribution<int> dist2(60, 75);
	
	for(int counter=0; counter<tracks; ++counter)
	{
		Track* track = tl[counter];

		// to skip automations or unsupported tracks
		if(!allowed.contains(track->type())) continue;

		MidiClip* clip = static_cast<MidiClip*>(track->getClip(m_ps->currentPattern()));
		clip->clearNotes();

		int steps = (clip->endPosition() - clip->startPosition())/DefaultBeatsPerBar;
		//qDebug() << "End Position and Steps: " << clip->endPosition() << steps;

		for(int s = 0; s<steps; ++s)
		{
			int length = DefaultBeatsPerBar;
			int pos = s*DefaultBeatsPerBar;
			int key = 69; // dist2(generator); // 69: A4?

			// 0 - 100; with more of 0% volumes
			int volume = dist1(generator)*10;
			if(volume>80) volume = 100;
			else volume = 0;

			if(volume <=0) continue; // empty cell

			int panning = 0;
			std::shared_ptr<DetuningHelper> detuning = 0;
			
			Note note = Note(length, pos, key, volume, panning, detuning);
			note.setType(Note::Type::Step);
			
			clip->addNote(note);
		}
	}

	QApplication::restoreOverrideCursor();
}

randomize-track-color.cpp

// change track color

QColor buffer = ColorChooser::getPalette(ColorChooser::Palette::Track)[rand() % 48];
track->setColor(buffer);

renumerate-tracks.cpp

// enumerate pattern editor tracks

void PatternEditor::renumerateTracks()
{
	QRegularExpression regex("^#[0-9\\:\\-\\_\\s]*");

	TrackContainer::TrackList tl = model()->tracks();
	int tracks = tl.size();
	for(int i=0; i<tracks; ++i)
	{
		Track* track = tl[i];
		
		// throw old renumeration signature
		QString oldName = QString(track->name()).replace(regex, "");

		// apply new renumeration, zero-padded
		int width = QString::number(std::abs(tracks)).length();
		QString enumeration = QString("%1").arg(i+1, width, 10, QChar('0'));
		track->setName(QString("#%1 %2").arg(enumeration).arg(oldName));
	}
}