/ 
Music-ScaleNote-0.0504
River stage one • 1 direct dependent • 1 total dependent
/ Music::ScaleNote

NAME

Music::ScaleNote - Manipulate the position of a note in a scale

VERSION

version 0.0504

SYNOPSIS

use Music::ScaleNote;

my $msn = Music::ScaleNote->new(
  scale_note  => 'C',
  scale_name  => 'pminor',
  note_format => 'ISO',
  offset      => 1,
  verbose     => 1,
);

my $note = $msn->get_offset( note_name => 'C4' );
print $note->format('ISO'), "\n"; # D#4

$msn = Music::ScaleNote->new(
  scale_note  => 'C',
  scale_name  => 'major',
  note_format => 'midinum',
  offset      => -1,
  verbose     => 1,
);
$note = $msn->get_offset( note_name => 60 );
print $note->format('midinum'), "\n"; # 59

DESCRIPTION

A Music::ScaleNote object manipulates the position of a note in a scale.

Given a scale_name, a scale_note, a starting note_name, the note_format, and a scale position offset, this module computes the new note.

So for scale C D# F G A# (C pentatonic minor), note name C4 (given the ISO format), and offset 1 (move one scale step to the right), this module will return D#4.

For offset of -1, the note A#3 is returned.

ATTRIBUTES

scale_note

This is the isobase name of the note (with no octave) that starts the scale.

Default: C

Examples: G#, Eb

scale_name

This is the name of the scale to use.

Please see "SCALES" in Music::Scales for the possibilities.

Default: major

note_format

The format as given by "STYLES" in Music::Note. If set in the constructor, this is used in the get_offset method.

Default: ISO

This is used in conjunction with the note_name to determine the Music::Note in the get_offset method.

offset

The integer offset of a new scale position. If set in the constructor, this is used in the get_offset method.

Default: 1

verbose

Show the progress of the get_offset method.

Default: 0

METHODS

new

$msn = Music::ScaleNote->new;  # Use defaults

$msn = Music::ScaleNote->new(  # Override defaults
  scale_note  => $scale_start_note,
  scale_name  => $scale_name,
  verbose     => $boolean,
  note_format => $format,
  offset      => $integer,
);

Create a new Music::ScaleNote object.

get_offset

$note = $msn->get_offset( note_name => $note );

$note = $msn->get_offset(  # Override defaults
  note_name   => $note,
  note_format => $format,
  offset      => $integer,
);

Return a new Music::Note object based on the required note_name, and optional note_format and offset parameters.

For formats of isobase, ISO and midi, the note_name can be given as a "bare note name" or a note-octave name. But for the midinum format, the note_name must be given as a MIDI note number.

Be aware that if the note_name is given as a "bare note" (with no octave), and the format is ISO, the octave returned will be 4 by default. For format of midinum and the note_name being a letter, a nonsensical result will be returned. This mixing up of format and note name is not how to use this module.

SEE ALSO

The t/01-methods.t file in this distribution.

Moo

List::Util

Music::Note

Music::Scales

Example usage:

https://github.com/ology/Music/blob/master/hilbert-notes

https://github.com/ology/Music/blob/master/lindenmayer-midi

AUTHOR

Gene Boggs <gene@cpan.org>

COPYRIGHT AND LICENSE

This software is copyright (c) 2019 by Gene Boggs.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.