# Copyright 2007, 2008, 2009, 2010, 2011 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::Gtk2::Graph::Plugin::Alerts;
use 5.010;
use strict;
use warnings;
use Gtk2;
use App::Chart::Annotation;
use List::Util qw(min max);
use App::Chart::Gtk2::Ex::GtkGCBits;
use base 'App::Chart::Gtk2::Graph::Plugin';
# uncomment this to run the ### lines
#use Smart::Comments;
use constant ALERTS_COLOUR => 'red';
use constant { ELEM_PRICE => 0,
ELEM_ABOVE => 1 };
use constant { ALERT_COLOUR => 'red',
ALERT_WIDTH => 20,
ALERT_HEIGHT => 8 };
sub draw_t {
my ($graph) = @_;
my $series = $graph->get('series_list')->[0] || return undef;
my $timebase = $series->timebase;
return 1 + min ($timebase->today, $series->hi);
}
sub draw {
my ($class, $graph, $region, $alerts) = @_;
### Graph-Alerts draw()
$alerts ||= do {
require App::Chart::Annotation;
# FIXME: series autoloads not so good
# $series->isa('App::Chart::Series::Database') || return;
# $series->Alerts_arrayref;
my @alerts = _alerts_for_series_list($graph->{'series_list'});
\@alerts
};
if (! @$alerts) {
### none
return;
}
my $win = $graph->window;
my $scale_y = $graph->scale_y_proc;
my $gc = ($graph->{'alert_gc'} ||= do {
my ($colour_str, $color_obj)
= App::Chart::Gtk2::GUI::color_object ($graph, ALERT_COLOUR);
my $bg_color = $graph->get_style->bg('normal');
my $xor_color = Gtk2::Gdk::Color->new
(0,0,0, $color_obj->pixel ^ $bg_color->pixel);
App::Chart::Gtk2::Ex::GtkGCBits->get_for_widget ($graph, { function => 'xor',
foreground => $xor_color });
});
my $t = draw_t ($graph);
my $x = $graph->scale_x ($t);
$gc->set_clip_region ($region);
foreach my $elem (@$alerts) {
my $y = $scale_y->($elem->{'price'});
my $y_offset = ($elem->{'above'} ? - ALERT_HEIGHT : ALERT_HEIGHT);
### price: $elem->{'price'}
### y: $y
$win->draw_lines ($gc,
$x - ALERT_WIDTH, $y,
$x, $y,
$x, $y + $y_offset);
}
$gc->set_clip_region (undef);
}
sub vrange {
my ($class, $graph, $series_list) = @_;
### Graph-Alerts vrange(): "@$series_list"
### values: map {$_->price} _alerts_for_series_list($series_list)
return map {$_->price} _alerts_for_series_list($series_list);
}
sub _alerts_for_series_list {
my ($series_list) = @_;
my @alerts;
foreach my $series (@$series_list) {
if (my $func = $series->can('Alerts_arrayref')) {
push @alerts, @{$series->$func};
}
}
return @alerts;
}
1;
__END__
# =head1 NAME
#
# App::Chart::Gtk2::Graph::Plugin::Alerts -- graph drawing of a latest quote
#
# =for test_synopsis my ($graph, $region)
#
# =head1 SYNOPSIS
#
# use App::Chart::Gtk2::Graph::Plugin::Alerts;
# App::Chart::Gtk2::Graph::Plugin::Alerts->draw ($graph, $region);
#
# =head1 SEE ALSO
#
# L<App::Chart::Gtk2::Graph>
#
# =cut