# 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::RangeMidpoint;
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';
use App::Chart::Series::Derived::SMA;
use App::Chart::Series::Derived::WilliamsR;
sub longname { __('Range Midpoint') }
sub shortname { __('Range Mid') }
sub manual { __p('manual-node','Range Midpoint') }
use constant
{ type => 'average',
priority => -10,
parameter_info => [ { name => __('Days'),
key => 'range_midpoint_days',
type => 'integer',
minimum => 1,
default => 20 } ],
};
sub new {
my ($class, $parent, $N) = @_;
$N //= parameter_info()->[0]->{'default'};
($N > 0) || croak "Range Midpoint bad N: $N";
return $class->SUPER::new
(parent => $parent,
parameters => [ $N ],
arrays => { values => [] },
array_aliases => { });
}
*warmup_count = \&App::Chart::Series::Derived::SMA::warmup_count; # $N-1
*fill_part = \&App::Chart::Series::Derived::WilliamsR::fill_part;
sub proc {
my ($class_or_self, $N) = @_;
my (@H, @L);
return sub {
my ($high, $low, $close) = @_;
unshift @H, $high // $close;
unshift @L, $low // $close;
if (@H > $N) {
pop @H;
pop @L;
}
return 0.5 * (max(@H)+min(@L));
};
}
1;
__END__
# =head1 NAME
#
# App::Chart::Series::Derived::RangeMidpoint -- high/low midpoint over N days
#
# =head1 SYNOPSIS
#
# my $series = $parent->RangeMidpoint;
#
# =head1 DESCRIPTION
#
# ...
#
# =head1 SEE ALSO
#
# L<App::Chart::Series>, L<App::Chart::Series::Derived::Midpoint>
#
# =cut