# 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::Midpoint;
use 5.010;
use strict;
use warnings;
use Carp;
use List::Util qw(min max);
use Scalar::Util;
use Locale::TextDomain ('App-Chart');
use App::Chart::Database;
use App::Chart::TZ;
use base 'App::Chart::Series::Indicator';
sub longname { __('Midpoint (H+L)/2') }
sub shortname { __('Mid') }
sub manual { __p('manual-node','Midpoint') }
use constant
{ type => 'selector',
};
sub new {
my ($class, $parent) = @_;
if (! $parent->array('highs') && ! $parent->array('lows')) {
return $parent;
}
return $class->SUPER::new
(parent => $parent,
arrays => { values => [] },
array_aliases => { });
}
sub fill_part {
my ($self, $lo, $hi) = @_;
my $parent = $self->{'parent'};
$parent->fill ($lo, $hi);
my $closes = $parent->values_array;
my $highs = $parent->array('highs') // $closes;
my $lows = $parent->array('lows') // $closes;
my $s = $self->values_array;
$hi = min ($hi, $#$closes);
if ($#$s < $hi) { $#$s = $hi; } # pre-extend
foreach my $i ($lo .. $hi) {
my $close = $closes->[$i];
if (defined $close) {
my $low = $lows->[$i] // $close;
my $high = $highs->[$i] // $close;
$s->[$i] = ($high + $low) / 2;
}
}
}
1;
__END__
# =head1 NAME
#
# App::Chart::Series::Derived::Midpoint -- high/low midpoint
#
# =head1 SYNOPSIS
#
# my $series = $parent->Midpoint;
#
# =head1 DESCRIPTION
#
# ...
#
# =head1 SEE ALSO
#
# L<App::Chart::Series>
#
# =cut