# 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::TRIX;
use 5.010;
use strict;
use warnings;
use Carp;
use Locale::TextDomain 1.17; # for __p()
use Locale::TextDomain ('App-Chart');
use base 'App::Chart::Series::Indicator';
use App::Chart::Series::Derived::EMAx3;
# http://www.incrediblecharts.com/indicators/trix_indicator.php
# Also called "Trix Oscillator".
sub longname { __('TRIX') }
*shortname = \&longname;
sub manual { __p('manual-node','TRIX') }
use constant
{ type => 'indicator',
units => 'price_slope',
hlines => [ 0 ],
parameter_info => [ { name => __('Days'),
key => 'trix_days',
type => 'integer',
minimum => 1,
default => 20 } ],
};
sub new {
my ($class, $parent, $N) = @_;
### TRIX->new: \@_
$N //= parameter_info()->[0]->{'default'};
($N > 0) || croak "TRIX bad N: $N";
return $class->SUPER::new
(parent => $parent,
parameters => [ $N ],
arrays => { values => [] },
array_aliases => { });
}
sub warmup_count {
my ($self_or_class, $N) = @_;
return 1 + App::Chart::Series::Derived::EMAx3->warmup_count($N);
}
sub proc {
my ($class_or_self, $N) = @_;
my $ema3_proc = App::Chart::Series::Derived::EMAx3->proc($N);
my $prev;
return sub {
my ($value) = @_;
my $e3 = $ema3_proc->($value);
my $ret;
if (defined $prev && $prev != 0) {
$ret = 100 * ($e3 - $prev) / $prev;
}
$prev = $e3;
return $ret;
};
}
1;
__END__
# =head1 NAME
#
# App::Chart::Series::Derived::TRIX -- ...
#
# =head1 SYNOPSIS
#
# my $series = $parent->TRIX($N);
#
# =head1 DESCRIPTION
#
# ...
#
# =head1 SEE ALSO
#
# L<App::Chart::Series>
#
# =cut