# Copyright 2008, 2009, 2010 Kevin Ryde
# This file is part of Chart.
#
# Chart is free software; you can redistribute it and/or modify it under the
# terms of the GNU General Public License as published by the Free Software
# Foundation; either version 3, or (at your option) any later version.
#
# Chart is distributed in the hope that it will be useful, but WITHOUT ANY
# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
# FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
# details.
#
# You should have received a copy of the GNU General Public License along
# with Chart. If not, see <http://www.gnu.org/licenses/>.
package App::Chart::Series::Derived::Mul;
use 5.008;
use strict;
use warnings;
use Carp;
use List::Util qw(min max);
use Scalar::Util;
use App::Chart::Database;
use App::Chart::TZ;
use base 'App::Chart::Series';
use constant
{ longname => 'Multiply',
shortname => 'Mul',
type => 'overload',
};
sub new {
my ($class, $parent, @factors) = @_;
my $factor = 1;
foreach (@factors) {
if (ref $_) {
croak 'Can only multiply a App::Chart::Series by a constant';
}
$factor *= $_;
}
return $class->SUPER::new
(parent => $parent,
factor => $factor,
arrays => { map {; $_ => [] } keys %{$parent->{'arrays'}} });
}
sub fill_part {
my ($self, $lo, $hi) = @_;
my $parent = $self->{'parent'};
my $factor = $self->{'factor'};
$parent->fill ($lo, $hi);
my $arrays = $self->{'arrays'};
while (my ($aname, $s) = each %$arrays) {
my $p = $parent->array($aname);
my $hi = min ($hi, $#$p);
if ($#$s < $hi) { $#$s = $hi; } # pre-extend
foreach my $i ($lo .. $hi) {
if (defined $p->[$i]) {
$s->[$i] = $p->[$i] * $factor;
}
}
}
}
1;
__END__
# =head1 NAME
#
# App::Chart::Series::Derived::Mul -- series multiplication
#
# =head1 SYNOPSIS
#
# my $series = $parent * 100.0;
#
# # or directly
# my $series = $parent->mul(2.5);
#
# =head1 DESCRIPTION
#
# ...
#
# =head1 SEE ALSO
#
# L<App::Chart::Series>
#
# =cut