NAME
Music::Duration::Partition - Partition a musical duration into rhythmic phrases
VERSION
version 0.0505
SYNOPSIS
use MIDI::Simple;
use Music::Duration::Partition;
use Music::Scales;
my $mdp = Music::Duration::Partition->new(
size => 8,
pool => [qw/ qn en sn /],
weights => [ 0.2, 0.3, 0.5 ],
);
$mdp->pool_select( sub { ... } ); # Optional
my $motif = $mdp->motif;
my @scale = get_scale_MIDI( 'C', 4, 'major' );
my $score = MIDI::Simple->new_score;
for my $n ( 0 .. 31 ) { # 4 loops over the motif
$score->n( $motif->[$n % @$motif], $scale[int rand @scale] );
}
$score->write_score('motif.mid');
# The pool may also be made of MIDI durations
$mdp = Music::Duration::Partition->new(
size => 100,
pool => [qw/ d50 d25 /],
);DESCRIPTION
Music::Duration::Partition partitions a musical duration into rhythmic phrases, given by the size, into smaller durations drawn from the pool of possibly weighted durations.
ATTRIBUTES
durations
$durations = $mdp->durations;A hash reference of duration lengths (keyed by duration name).
Default: \%MIDI::Simple::Length
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: [ keys %MIDI::Simple::Length ] (wn, hn, qn, ...)
This can be either a list of duration names, as in the default example, 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;Specification of the frequency 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
verbose
$verbose = $mdp->verbose;Show the progress of the motif method.
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.
SEE ALSO
The eg/* and t/01-methods.t programs in this distribution.
AUTHOR
Gene Boggs <gene@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2020 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.