tonic 0.0.1

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

Add this to your package's pubspec.yaml file:

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
  var 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]

  var 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]

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

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

MIT License

Copyright (c) 2014 Oliver Steele

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.