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lib/App/Chart/Gtk2/HAxis.pm  view on Meta::CPAN

sub _do_configure_event {
  my ($self, $event) = @_;
  $self->queue_draw;
  return shift->signal_chain_from_overridden(@_);
}

# Return the width in pixels needed to draw the given $format_func string in
# $layout.
#
# This is only geared towards the month/year formats above.  It goes through
# all the months Jan to Dec to see how they come out, but assumes year 2000
# is as wide as any year will be.
#
sub format_func_width {
  my ($layout, $format_func) = @_;
  return max (map { my $str = $format_func->(2000, $_);
                    $layout->set_text ($str);
                    my ($str_width, $str_height) = $layout->get_pixel_size;
                    $str_width;
                  } 1 .. 12);
}

1;
__END__

=for stopwords undef HAxis

=head1 NAME

App::Chart::Gtk2::HAxis -- horizontal timebase axis display widget

=head1 SYNOPSIS

 my $hscale = App::Chart::Gtk2::HAxis->new();

=head1 WIDGET HIERARCHY

C<App::Chart::Gtk2::HAxis> is a subclass of C<Gtk2::DrawingArea>.

    Gtk2::Widget
      Gtk2::DrawingArea
        App::Chart::Gtk2::HAxis

=head1 DESCRIPTION

A C<App::Chart::Gtk2::HAxis> widget displays tick marks and dates on a
horizontal axis, for use below a C<App::Chart::Gtk2::Graph>.

=head1 PROPERTIES

=over 4

=item C<adjustment> (C<Gtk2::Adjustment>, default undef)

An adjustment object giving the range of dates to display.  The HAxis
display updates as the adjustment moves.

=item C<timebase> (C<App::Chart::Timebase> object, default undef)

The timebase for the dates displayed.  This is used to get the actual
calendar date represented by integer values from the C<adjustment>.

=back

=head1 SEE ALSO

L<App::Chart::Gtk2::Graph>

=head1 HOME PAGE

L<http://user42.tuxfamily.org/chart/index.html>

=head1 LICENCE

Copyright 2007, 2008, 2009, 2010, 2011, 2014 Kevin Ryde

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; see the file F<COPYING>.  Failing that, see
L<http://www.gnu.org/licenses/>.

=cut