tonic 0.2.3

Classes and methods for representing and manipulating concepts from music theory: Pitch, PitchClass, Interval, Scale, Chord.

Dart

Tonic is a Dart package that models components of music theory.

It also computes chord diagrams; this functionality is in progress. (I'm porting it from schoen.)

Installing via Pub

The current version of this package requires Dart 2.0. Use version 0.1.1 with Dart 1.x.

Add the following to your pubspec.yaml, and run pub get.

dependencies:
  tonic: any

Example Usage

  import 'package:tonic/tonic.dart';

  main() {
    // Hemholtz and Scientific pitch notation
    print(Pitch.parse('C4'));
    print(Pitch.parse('C♯4'));
    print(Pitch.parse('C♭4'));

    // Unicode and ASCII sharps and flats
    print(Pitch.parse('C#4') == Pitch.parse('C#4')); // => true
    print(Pitch.parse('Cb4') == Pitch.parse('Cb4')); // => true

    // Enharmonic equivalents
    print(Pitch.parse('E♯4').midiNumber == Pitch.parse('F4').midiNumber); // => true
    print(Pitch.parse('E4').midiNumber == Pitch.parse('F♭4').midiNumber); // => true
    print(Pitch.parse('E♯4') == Pitch.parse('F4')); // => false
    print(Pitch.parse('E4') == Pitch.parse('F♭4')); // => false

    print(Pitch.parse('C4').octave); // => 5
    print(Pitch.parse('C4').midiNumber); // => 60
    print(new Pitch.fromMidiNumber(60)); // => C4

    // Intervals
    print(Interval.M3);
    print(Interval.parse('M3'));
    print(Interval.m3.semitones); // => 3
    print(Interval.M3.semitones); // => 4
    print(Interval.A3.semitones); // => 5
    print(Interval.d4.semitones); // => 4
    print(Interval.P4.semitones); // => 5
    print(Interval.A4.semitones); // => 6
    print(Interval.M3.number); // => 3
    print(Interval.M3.qualityName); // => "M"

    // Interval arithmetic
    print(Interval.M3 + Interval.m3); // => P5
    print(Interval.m3 + Interval.M3); // => P5
    print(Interval.m3 + Interval.m3); // => d5
    print(Interval.M3 + Interval.M3); // => A5

    print(Pitch.parse('C4') + Interval.M3); // => E4
    print(Pitch.parse('C4') + Interval.A3); // => E♯4
    print(Pitch.parse('C4') + Interval.d4); // => F♭4
    print(Pitch.parse('C4') + Interval.P4); // => F4

    print(Pitch.parse('C4') - Pitch.parse('C4'));   // => P1
    print(Pitch.parse('D4') - Pitch.parse('C4'));   // => M2
    print(Pitch.parse('E4') - Pitch.parse('C4'));   // => M3
    print(Pitch.parse('E♯4') - Pitch.parse('C4')); // => A3
    print(Pitch.parse('F♭4') - Pitch.parse('C4')); // => d4
    print(Pitch.parse('F4') - Pitch.parse('C4'));  // => P4

    // Chords
    print(Chord.parse('E Major'));
    print(ChordPattern.parse('Dominant 7th')); // => Dom 7th
    print(ChordPattern.fromIntervals([Interval.P1, Interval.M3, Interval.P5])); // => Major
    print(ChordPattern.fromIntervals([Interval.P1, Interval.m3, Interval.P5])); // => Minor
    print(ChordPattern.fromIntervals([Interval.P1, Interval.m3, Interval.P5, Interval.m7])); // => Min 7th

    // Scales
    final scalePattern = ScalePattern.findByName('Diatonic Major');
    print(scalePattern.intervals); // => [P1, M2, M3, P4, P5, M6, M7]
    print(scalePattern.modes);
    print(scalePattern.modes['Dorian'].intervals); // => [P1, M2, m3, P4, P5, M6, m7]

    final scale = scalePattern.at(Pitch.parse('E4'));
    print(scale.intervals); // => [P1, M2, M3, P4, P5, M6, M7]
    print(scale.pitchClasses); // => [E4, F♯4, G♯4, A4, B4, C♯5, D♯5]

    // Instruments and fret fingerings
    final chord = Chord.parse('E Major');
    final instrument = Instrument.Guitar;
    print(bestFrettingFor(chord, instrument)); // => 022100
  }

More examples can be found in the tests in test/*_test.dart.

License

MIT