# Copyright 2006, 2007, 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::Coppock;
use 5.010;
use strict;
use warnings;
use List::Util qw(min max);
use Locale::TextDomain ('App-Chart');
use base 'App::Chart::Series::Indicator';
use App::Chart::Series::Derived::ROC;
use App::Chart::Series::Derived::WMA;
sub longname { __('Coppock Curve') }
sub shortname { __('Coppock') }
sub manual { __p('manual-node','Coppock Curve') }
use constant
{ type => 'indicator',
units => 'roc_percent',
hlines => [ 0 ],
parameter_info => App::Chart::Series::Derived::Momentum::parameter_info(),
};
my $N1 = 11;
my $N2 = 14;
my $smooth = 10;
sub new {
my ($class, $parent) = @_;
return $class->SUPER::new
(parent => $parent,
parameters => [ ],
arrays => { values => [] });
}
sub proc {
my ($self_or_class) = @_;
my $roc1_proc = App::Chart::Series::Derived::ROC->proc ($N1);
my $roc2_proc = App::Chart::Series::Derived::ROC->proc ($N2);
my $wma_proc = App::Chart::Series::Derived::WMA->proc ($smooth);
return sub {
my ($value) = @_;
my $roc1 = $roc1_proc->($value);
my $roc2 = $roc2_proc->($value);
if (! defined $roc1 || ! defined $roc2) { return undef; }
return $wma_proc->($roc1 + $roc2);
};
}
sub warmup_count {
my ($class_or_self) = @_;
return $smooth - 1 + max($N1, $N2);
}
1;
__END__
# =head1 NAME
#
# App::Chart::Series::Derived::Coppock -- Coppock indicator
#
# =head1 SYNOPSIS
#
# my $series = $parent->Coppock;
#
# =head1 DESCRIPTION
#
# ...
#
# =head1 SEE ALSO
#
# L<App::Chart::Series>, L<App::Chart::Series::Derived::ROC>,
# L<App::Chart::Series::Derived::WMA>
#
# =cut