private static string GetChordFromNotes(Note[] notes)
{
bool returnNonOctaveNotes = false;
// Sorting notes by their value will let us know which is the bass note
notes = notes.OrderBy(n => n.Value).ToArray();
// If the distance between the lowest note and the highest note is greater than 12,
// we have a chord that spans octaves and we should return a chord in which the
// notes have no octave.
if (notes[notes.Length - 1].Value - notes[0].Value > Note.SemitonesInOctave)
{
returnNonOctaveNotes = true;
}
Note bassNote = notes[0];
// Sorting notes by position in octave will let us know which chord we have
notes = notes.OrderBy(n => n.PositionInOctave).ToArray();
notes = FlattenNotesByPositionInOctave(notes);
string[] possibleChords = new string[notes.Length];
for (int i = 0; i < notes.Length; i++)
{
Note[] notesToCheck = new Note[notes.Length];
for (int u = 0; u < notes.Length; u++)
{
notesToCheck[u] = notes[(i + u) % notes.Length];
}
possibleChords[i] = GetChordType(Intervals.CreateIntervalsFromNotes(notesToCheck));
}
// Now, return the first non-null string
for (int i = 0; i < possibleChords.Length; i++)
{
if (possibleChords[i] != null)
{
StringBuilder sb = new StringBuilder();
if (returnNonOctaveNotes)
{
sb.Append(Note.ToneStringWithoutOctave(notes[i].Value));
}
else
{
sb.Append(notes[i]);
}
sb.Append(possibleChords[i]);
if (!bassNote.Equals(notes[i]))
{
sb.Append("^");
sb.Append(bassNote);
}
return(sb.ToString());
}
}
return(null);
}
public static string GetChordType(Intervals intervals)
{
foreach (var entry in ChordMap)
{
if (intervals.Equals(entry.Value))
{
return(entry.Key);
}
}
return(null);
}
protected bool Equals(Intervals other)
{
return(string.Equals(intervalPattern, other.intervalPattern));
}
/// <summary>
/// Returns a list of chords represented by this chord progression
/// </summary>
/// <returns></returns>
public Chord[] GetChords()
{
if (knownChords != null)
{
return(knownChords);
}
Chord[] chords = new Chord[progressionElements.Length];
Pattern scalePattern = key.Scale.Intervals.SetRoot(key.Root).GetPattern();
string[] scaleNotes = scalePattern.ToString().Split(' ');
int counter = 0;
foreach (string progressionElement in progressionElements)
{
Note rootNote = NoteProviderFactory.GetNoteProvider()
.CreateNote(scaleNotes[RomanNumeralToIndex(progressionElement)]);
rootNote.UseSameDurationAs(key.Root);
Intervals intervals = Chord.MAJOR_INTERVALS;
if ((progressionElement[0] == 'i') || (progressionElement[0] == 'v'))
{
// Checking to see if the progression element is lowercase
intervals = Chord.MINOR_INTERVALS;
}
if ((progressionElement.ToLower().IndexOf("o") > 0) || (progressionElement.ToLower().IndexOf("d") > 0))
{
// Checking to see if the progression element is diminished
intervals = Chord.DIMINISHED_INTERVALS;
}
if (progressionElement.EndsWith("7"))
{
if (intervals.Equals(Chord.MAJOR_INTERVALS))
{
intervals = Chord.MAJOR_SEVENTH_INTERVALS;
}
else if (intervals.Equals(Chord.MINOR_INTERVALS))
{
intervals = Chord.MINOR_SEVENTH_INTERVALS;
}
else if (intervals.Equals(Chord.DIMINISHED_INTERVALS))
{
intervals = Chord.DIMINISHED_SEVENTH_INTERVALS;
}
}
if (progressionElement.EndsWith("7%6"))
{
if (intervals.Equals(Chord.MAJOR_INTERVALS))
{
intervals = Chord.MAJOR_SEVENTH_SIXTH_INTERVALS;
}
else if (intervals.Equals(Chord.MINOR_INTERVALS))
{
intervals = Chord.MINOR_SEVENTH_SIXTH_INTERVALS;
}
}
// Check for inversions
int inversions = CountInversions(progressionElement);
chords[counter] = new Chord(rootNote, intervals);
if (inversions > 0)
{
chords[counter].Inversion = inversions;
}
counter++;
}
return(chords);
}
public Chord(Key key)
{
Root = key.Root;
intervals = key.Scale.Intervals;
}
public Chord(Note root, Intervals intervals)
{
Root = root;
this.intervals = intervals;
}
public Chord(Chord chord)
{
Root = chord.Root;
intervals = chord.GetIntervals();
Inversion = chord.Inversion;
}
public static void AddChord(string name, Intervals intervalPattern)
{
ChordMap.Add(name, intervalPattern);
}