/// <inheritdoc cref="GetNotes(IChord, ChordNoteMappingSource, NotePitch, NotePitch)"/>
internal static IEnumerable <NotePitch> GetNotes(IChord chord, ChordNoteMappingSource mappingSource, int minOctave = 0, int maxOctave = 9)
{
int basePitch = MusicTheoryServices.SemitonesInOctave;
NotePitch minPitch = (NotePitch)(basePitch + (minOctave * MusicTheoryServices.SemitonesInOctave));
NotePitch maxPitch = (NotePitch)(basePitch + ((maxOctave + 1) * MusicTheoryServices.SemitonesInOctave) - 1);
return(MusicTheoryServices.GetNotes(chord, mappingSource, minPitch, maxPitch));
}
/// <summary>
/// Returns notes that sound "good" under the given chord and pitch range restriction.
/// </summary>
/// <param name="chord"> he requested chrod to map the notes against. </param>
/// <param name="mappingSource"> The mapping source - either scale notes or the chord's arpeggio notes. </param>
/// <param name="minPitch"> Lower bound pitch range constraint for the mapped notes. </param>
/// <param name="maxPitch"> Upper bound pitch range constraint for the mapped notes. </param>
/// <returns> Notes that sound "good" under the given chord, mapping source, and pitch range restriction. </returns>
internal static IEnumerable <NotePitch> GetNotes(IChord chord, ChordNoteMappingSource mappingSource, NotePitch minPitch, NotePitch maxPitch)
{
// build the scale (sequence of intervals from the chord's root note)
var rootNote = ConvertToExternalNoteName(chord.ChordRoot);
Scale scale = null;
switch (chord.ChordType)
{
case ChordType.Diminished:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Three, Interval.Six }, rootNote);
}
else // diminished arppeigo with added 9th
{
scale = new Scale(new Interval[] { Interval.One, Interval.Two, Interval.Three, Interval.Six }, rootNote);
}
break;
case ChordType.Dominant7:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Three, Interval.Two }, rootNote);
}
else // mixolydian scale with omitted 4th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Three, Interval.Two, Interval.One, Interval.Two }, rootNote);
}
break;
case ChordType.Dominant7b9:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Three, Interval.Three, Interval.FromHalfSteps(-1) }, rootNote);
}
else // harmonic minor v scale with 6th omitted
{
scale = new Scale(new Interval[] { Interval.One, Interval.Three, Interval.One, Interval.Two, Interval.Three, Interval.Two }, rootNote);
}
break;
case ChordType.Dominant7Suspended4:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Five, Interval.Two, Interval.Three, Interval.Two }, rootNote);
}
else // mixolydian scale
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.One, Interval.Two }, rootNote);
}
break;
case ChordType.Dominant7Augmented5:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Four, Interval.Two, Interval.Two }, rootNote);
}
else // whole tone scale
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Two, Interval.Two, Interval.Two, Interval.Two }, rootNote);
}
break;
case ChordType.Dominant7Sharped9:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Three, Interval.Four, Interval.FromHalfSteps(-3) }, rootNote);
}
else // mixolydian #2 scale with omitted 4th
{
scale = new Scale(new Interval[] { Interval.Three, Interval.One, Interval.Three, Interval.Two, Interval.One, Interval.Two }, rootNote);
}
break;
case ChordType.HalfDiminished:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Three, Interval.Four, Interval.Two }, rootNote);
}
else // locrian mode scale with ommited 2nd
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.Two }, rootNote);
}
break;
case ChordType.Major:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Five }, rootNote);
}
else // dorian major scale with omitted 4th and 7th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Three, Interval.Two, Interval.Three }, rootNote);
}
break;
case ChordType.Major7:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Four, Interval.One }, rootNote);
}
else // dorian major scale with omitted 4th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Three, Interval.Two, Interval.Two, Interval.One }, rootNote);
}
break;
case ChordType.MajorAugmented5:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Four, Interval.Four }, rootNote);
}
else // lydian augmented scale
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Two, Interval.Two, Interval.One, Interval.Two, Interval.One }, rootNote);
}
break;
case ChordType.MajorSuspended4:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Five, Interval.Two, Interval.Five }, rootNote);
}
else // mixolydian scale
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.One, Interval.Two }, rootNote);
}
break;
case ChordType.Minor:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Four, Interval.Five }, rootNote);
}
else // aeolian minor scale with omitted 2nd and 6th
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Two, Interval.Two, Interval.Three, Interval.Two }, rootNote);
}
break;
case ChordType.Minor6:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Four, Interval.Two, Interval.Three }, rootNote);
}
else // dorian minor scale with omitted 7th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.Two, Interval.Three }, rootNote);
}
break;
case ChordType.Minor7:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Four, Interval.Three, Interval.Two }, rootNote);
}
else // aeolian minor scale with omitted 6th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.Three, Interval.Two }, rootNote);
}
break;
case ChordType.MinorMajor7:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Three, Interval.Four, Interval.Four, Interval.One }, rootNote);
}
else // harmonic minor scale
{
scale = new Scale(new Interval[] { Interval.Two, Interval.One, Interval.Two, Interval.Two, Interval.One, Interval.Three, Interval.One }, rootNote);
}
break;
case ChordType.Major13:
if (mappingSource == ChordNoteMappingSource.Chord)
{
scale = new Scale(new Interval[] { Interval.Four, Interval.Three, Interval.Two, Interval.Three }, rootNote);
}
else // dorian major scale with omitted 4th and 7th
{
scale = new Scale(new Interval[] { Interval.Two, Interval.Two, Interval.Three, Interval.Two, Interval.Three }, rootNote);
}
break;
default:
break;
}
// get actual notes and filter out results according to range constraints
var result = from note in scale.GetNotes()
where (int)note.NoteNumber >= (byte)minPitch && (int)note.NoteNumber <= (byte) maxPitch
select(NotePitch)(int) note.NoteNumber;
return(result);
}
