private Phrase GenratePhraseBasic(int noteCount)
{
var phrase = new Phrase();
var selectedNotes =
(from onoffProbability in _probabilities
let noteOn = GetRandomBool(onoffProbability.OnOffChance)
where noteOn
select onoffProbability).ToList();
while (selectedNotes.Count > noteCount)
{
var leastPopularNote = selectedNotes.OrderBy(x => x.OnOffChance).FirstOrDefault();
selectedNotes.Remove(leastPopularNote);
}
while (selectedNotes.Count < noteCount)
{
var mostPopularNote = _probabilities.Except(selectedNotes)
.OrderByDescending(x => x.OnOffChance)
.FirstOrDefault();
selectedNotes.Add(mostPopularNote);
}
selectedNotes = selectedNotes.Where(x => x != null).ToList();
selectedNotes = selectedNotes.OrderBy(x => x.Position).ToList();
foreach (var note in selectedNotes)
{
var randomNote = GetRandomNote(note.Notes);
phrase.Elements.Add(new PhraseElement
{
Position = note.Position,
Duration = 1,
Note = randomNote
});
}
phrase.Elements.RemoveAll(x => x.Position >= _riffLength);
PhraseHelper.UpdateDurationsFromPositions(phrase, _riffLength);
return(phrase);
}
public Phrase GeneratePhrase(string baseRiff = "")
{
var riffs = _riffs.OrderBy(x => _random.NextDouble()).Take(_numberOfRiffsToMerge).ToList();
if (baseRiff != "")
{
var riff = _riffs.Where(x => x.Description.ToLower() == baseRiff.ToLower()).ToList();
if (riff.Count == 1)
{
riffs = riffs.Except(riff).Take(_numberOfRiffsToMerge - 1).ToList();
riffs.InsertRange(0, riff);
}
}
GenerateRiffProbabilities(riffs);
var noteCount = GetNumberOfNotes();
var phrase = GenratePhraseBasic(noteCount);
var perfectRepeats = GetPerfectRepeats();
var timingRepeats = GetTimingRepeats(perfectRepeats);
var repeats = perfectRepeats.Union(timingRepeats)
.OrderBy(x => x.WindowSize)
.ThenBy(x => x.WindowStart)
.ThenBy(x => x.MatchWindowStart)
.ToList();
foreach (var repeat in repeats)
{
var sectionStartPositions = new List <decimal>
{
repeat.WindowStart,
repeat.WindowStart + repeat.WindowSize,
repeat.MatchWindowStart,
repeat.MatchWindowStart + repeat.WindowSize
};
foreach (var position in sectionStartPositions)
{
var element = phrase.Elements.FirstOrDefault(x => x.Position == position);
if (element != null)
{
continue;
}
element = GetNewRandomElement(position);
if (element != null)
{
phrase.Elements.Add(element);
}
}
}
foreach (var repeat in repeats)
{
phrase.Elements.RemoveAll(x => x.Position >= repeat.MatchWindowStart &&
x.Position < repeat.MatchWindowStart + repeat.WindowSize);
var repeatingElements = phrase
.Elements
.Where(x => x.Position >= repeat.WindowStart &&
x.Position < repeat.WindowStart + repeat.WindowSize)
.Select(x => x.Clone())
.ToList();
foreach (var element in repeatingElements)
{
element.Position = element.Position - repeat.WindowStart + repeat.MatchWindowStart;
if (repeat.MatchType != RepeatingElementsFinder.MatchResult.TimingMatch)
{
continue;
}
var probability = _probabilities.FirstOrDefault(x => x.Position == element.Position);
if (probability != null)
{
element.Note = GetRandomNote(probability.Notes);
}
}
phrase.Elements.AddRange(repeatingElements);
}
phrase.Elements = phrase.Elements.OrderBy(x => x.Position).ToList();
phrase.Elements.RemoveAll(x => x.Position >= _riffLength);
PhraseHelper.UpdateDurationsFromPositions(phrase, _riffLength);
phrase.Bpm = 60;
var lowNote = phrase.Elements.Min(x => x.Note);
if (lowNote <= NoteHelper.NoteToNumber("C2"))
{
NoteHelper.ShiftNotesDirect(phrase, 1, Interval.Octave, Direction.Up);
}
return(phrase);
}
