1 package LaTeX::TikZ::Mod::Layer;
8 LaTeX::TikZ::Mod::Layer - A modifier that specifies a drawing layer.
16 our $VERSION = '0.01';
20 use LaTeX::TikZ::Mod::Formatted;
23 use Any::Moose 'Util::TypeConstraints';
25 with 'LaTeX::TikZ::Mod';
33 subtype 'LaTeX::TikZ::Mod::LevelList'
34 => as 'ArrayRef[LaTeX::TikZ::Mod::Layer]';
36 coerce 'LaTeX::TikZ::Mod::LevelList'
38 => via { [ __PACKAGE__->new(name => $_) ] };
40 coerce 'LaTeX::TikZ::Mod::LevelList'
41 => from 'ArrayRef[Str]'
42 => via { [ map __PACKAGE__->new(name => $_), @$_ ] };
46 isa => 'LaTeX::TikZ::Mod::LevelList',
48 default => sub { [ ] },
52 sub above { @{$_[0]->_above} }
56 isa => 'LaTeX::TikZ::Mod::LevelList',
58 default => sub { [ ] },
62 sub below { @{$_[0]->_below} }
69 builder => '_build_score',
75 my ($orig, $self, %args) = @_;
77 my $name = $args{name};
79 $self->meta->find_attribute_by_name('name')
80 ->type_constraint->assert_valid($name);
81 my $layer = $layers{$name};
83 confess("Can't redefine layer '$name'") if keys(%args) > 1;
88 return $self->$orig(%args);
94 $layers{$self->name} = $self;
100 delete $layers{$self->name};
106 ref($self) . '/' . $self->name;
109 sub cover { $_[0]->name eq $_[1]->name }
117 my $name = $layer->name;
119 return $score{$name} if exists $score{$name};
122 for ($layer->above) {
125 $min = $cur if not defined $min or $min < $cur;
132 for ($layer->below) {
135 $max = $cur if not defined $max or $max < $cur;
143 confess("Order mismatch for $name") unless $min < $max;
144 $score{$name} = ($min + $max) / 2;
146 my $i = List::Util::max(values %score);
147 $score{$_} = ++$i for $name, @higher;
149 } elsif (defined $max) {
150 my $i = List::Util::min(values %score);
151 $score{$_} = --$i for @lower, $name;
154 $score{$_} = ++$i for @lower, $name, @higher;
165 local %score = (main => 0);
169 my @layers = sort { $score{$a} <=> $score{$b} }
170 map { ref() ? $_->name : $_ }
173 my @intro = map "\\pgfdeclarelayer{$_}",
179 "\\pgfsetlayers{" . join(',', @layers) . "}",
187 LaTeX::TikZ::Mod::Formatted->new(
189 content => $self->name,
193 use LaTeX::TikZ::Interface layer => sub {
197 __PACKAGE__->new(name => $name, @_);
200 __PACKAGE__->meta->make_immutable(
201 inline_constructor => 0,
206 Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
208 You can contact me by mail or on C<irc.perl.org> (vincent).
212 Please report any bugs or feature requests to C<bug-latex-tikz at rt.cpan.org>, or through the web interface at L<http://rt.cpan.org/NoAuth/ReportBug.html?Queue=LaTeX-TikZ>.
213 I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
217 You can find documentation for this module with the perldoc command.
221 =head1 COPYRIGHT & LICENSE
223 Copyright 2010 Vincent Pit, all rights reserved.
225 This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
229 1; # End of LaTeX::TikZ::Mod::Layer