NAME
Music::Duration::Partition - Partition a musical duration into rhythmic phrases
VERSION
version 0.0823
SYNOPSIS
use Music::Duration::Partition ();
my $mdp = Music::Duration::Partition->new(
size => 8, # 2 measures in 4/4 time
pool => [qw(hn dqn qn en)], # made from these durations
);
# the pool may be optionally weighted
$mdp = Music::Duration::Partition->new(
size => 100,
pool => [qw(d50 d25)],
weights => [ 0.7, 0.3 ],
);
# the pool may also be grouped
$mdp = Music::Duration::Partition->new(
pool => [qw(hn qn tqn)],
groups => [ 1, 1, 3 ],
);
my $motif = $mdp->motif; # list-ref of pool members
my @motifs = $mdp->motifs(4); # list of motifsDESCRIPTION
A Music::Duration::Partition divides a musical duration given by size, into rhythmic phrases of smaller durations drawn from the pool.
For example, to generate a measure in 5/4 time, set size equal to 5 and set the pool to an array-reference of MIDI::Simple durations whose lengths are less than or equal to 5 quarter notes.
To generate a measure in 5/8 time, set size equal to 2.5 (meaning 5 eighth notes).
For MIDI usage, please see Music::Duration::Partition::Tutorial::Quickstart and Music::Duration::Partition::Tutorial::Advanced.
ATTRIBUTES
size
$size = $mdp->size;The value, in quarter notes, of the duration to partition.
Default: 4
pool
$pool = $mdp->pool;The list of possible note durations to use in constructing a rhythmic motif.
Default: [wn, hn, qn, ..., xn, yn, zn] (see Music::Duration)
This can be either a list of duration names, or duration values, specified with a preceding d. A mixture of both is not well defined. YMMV
pool_select
$code = $mdp->pool_select->();
$mdp->pool_select( sub { ... } );A code reference used to select an item from the given duration pool.
Default: Random item from pool
weights
$weights = $mdp->weights;The frequencies of pool item selection.
The number of weights must equal the number of pool entries. The weights do not have to sum to 1 and can be any relative numbers.
Default: Equal probability for each pool entry
groups
$groups = $mdp->groups;The number of times that a pool item is selected in sequence.
The number of groups must equal the number of pool entries.
Default: 0 for each pool entry
* 0 and 1 mean the same thing for grouping. So if needed, an entry should have a value greater than one.
remainder
$remainder = $mdp->remainder;Append any remaining duration ticks to the end of the motif.
Default: 1 "Yes. Make it so."
abbreviation
$abbreviation = $mdp->abbreviation;Any remaining duration is checked against the MIDI::Simple::Length hash to see if it is included. If so, use that abbreviation, instead of a d value.
Default: 1 "Yes. Make it so."
verbose
$verbose = $mdp->verbose;Show the progress of the motif method.
Default: 0
METHODS
new
$mdp = Music::Duration::Partition->new(%arguments);Create a new Music::Duration::Partition object.
motif
$motif = $mdp->motif;Generate a rhythmic phrase of the given size.
This method returns a possibly different rhythmic motif each time it is called.
The default pool_select used constructs this by selecting a pool duration at random, that fits into the size remaining after each application, in a loop until the size is met.
motifs
@motifs = $mdp->motifs;
@motifs = $mdp->motifs($n);Return n motifs.
Default: n=1
add_to_score
$mdp->add_to_score($score, $motif, $pitches);Add the motif and pitches to the score.
SEE ALSO
The eg/* and t/01-methods.t programs in this distribution.
https://ology.github.io/music-duration-partition-tutorial/
AUTHOR
Gene Boggs <gene@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2019-2024 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.