tonic 0.2.5

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

example/tonic_example.dart

import 'package:tonic/tonic.dart';

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

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

  banner("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
  print(new Pitch.fromMidiNumber(60).helmholtzName); // => c'

  banner("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"

  banner("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

  banner("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

  banner("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(PitchClass.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]

  final chord = Chord.parse('E Major');
  final instrument = Instrument.guitar;
  print(bestFrettingFor(chord, instrument)); // => 022100
}

void banner(msg) => print("\n" + msg + ":");