Swiftpack.co - Package - dn-m/NotationModel


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The NotationModel package contains modules for the purposes of defining a model of musical notations.

The types contained herein extend the structures defined in the dn-m/Music package, providing a rich context for abstract musical information so that it can be represented within a variety of notational media. This package remains agnostic to the concrete rendering backend.

For work on the graphical representation of music in Swift, see dn-m/NotationView.



The SpelledPitch module exposes structures for describing abstract pitches (e.g., what you get if you press a key on a MIDI keyboard) with letter names and accidentals. This is done in a progressively-disclosed and type-safe manner: it is easy to describe common pitch scenarios, linearly more difficult to describe more-rare pitch scenarios, and it is impossible to describe logically-invalid pitch scenarios.

The Pitch.Spelling structure provides a model of the Helmholtz-Ellis notation system. This notation system scales elegantly from the Western common practice twelve-note equal division of the octave tuning system to that of high-limit just intonation. This system is represented in the SMuFL specification, making a mapping of these structures into a rendering context as seamless as possible.


The SpelledRhythm module defines models of beams, ties, and dots.


Defines a model for positioning values onto two-dimensional plots.


Extends the PlotModel, incorporating the concept of clefs, noteheads, accidentals, etc.


Work on this package requires Swift 4.2.

Build instructions

Clone the repo.

git clone https://github.com/dn-m/NotationModel

Dive inside.

cd NotationModel

Ask Swift Package Manager to update dependencies (all are dn-m).

swift package update

Compiles code and runs tests in terminal.

swift test

Ask Swift Package Manager to generate a nice Xcode project.

swift package generate-xcodeproj

Open it up.

open NotationModel.xcodeproj/

The NotationModel package contains several modules:


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0.9.0 - Aug 15, 2019

Version 0.9.0 removes the usage of CollectionWrapping and RandomAccessCollectionWrapping, which stopped working properly as of Swift 5.0.1 or thereabouts.

0.8.0 - Jun 30, 2019

0.7.0 - Jun 12, 2019

0.6.0 - Nov 3, 2018

0.5.0 - Oct 21, 2018