1 package LaTeX::TikZ::Mod::Layer;
8 LaTeX::TikZ::Mod::Layer - A modifier that specifies a drawing layer.
16 our $VERSION = '0.01';
21 use LaTeX::TikZ::Mod::Formatted;
23 use LaTeX::TikZ::Interface;
26 use Any::Moose 'Util::TypeConstraints';
28 with 'LaTeX::TikZ::Mod';
36 subtype 'LaTeX::TikZ::Mod::LevelList'
37 => as 'ArrayRef[LaTeX::TikZ::Mod::Layer]';
39 coerce 'LaTeX::TikZ::Mod::LevelList'
41 => via { [ __PACKAGE__->new(name => $_) ] };
43 coerce 'LaTeX::TikZ::Mod::LevelList'
44 => from 'ArrayRef[Str]'
45 => via { [ map __PACKAGE__->new(name => $_), @$_ ] };
49 isa => 'LaTeX::TikZ::Mod::LevelList',
51 default => sub { [ ] },
55 sub above { @{$_[0]->_above} }
59 isa => 'LaTeX::TikZ::Mod::LevelList',
61 default => sub { [ ] },
65 sub below { @{$_[0]->_below} }
72 builder => '_build_score',
78 my ($orig, $self, %args) = @_;
80 my $name = $args{name};
82 $self->meta->find_attribute_by_name('name')
83 ->type_constraint->assert_valid($name);
84 my $layer = $layers{$name};
86 confess("Can't redefine layer '$name'") if keys(%args) > 1;
91 return $self->$orig(%args);
97 my $name = $self->name;
98 $layers{$name} = $self;
99 Scalar::Util::weaken($layers{$name});
105 delete $layers{$self->name};
111 ref($self) . '/' . $self->name;
114 sub cover { $_[0]->name eq $_[1]->name }
122 my $name = $layer->name;
124 return $score{$name} if exists $score{$name};
127 for ($layer->above) {
130 $min = $cur if not defined $min or $min < $cur;
137 for ($layer->below) {
140 $max = $cur if not defined $max or $max < $cur;
148 confess("Order mismatch for $name") unless $min < $max;
149 $score{$name} = ($min + $max) / 2;
151 my $i = List::Util::max(values %score);
152 $score{$_} = ++$i for $name, @higher;
154 } elsif (defined $max) {
155 my $i = List::Util::min(values %score);
156 $score{$_} = --$i for @lower, $name;
159 $score{$_} = ++$i for @lower, $name, @higher;
170 local %score = (main => 0);
174 my @layers = sort { $score{$a} <=> $score{$b} }
175 map { ref() ? $_->name : $_ }
178 my @intro = map "\\pgfdeclarelayer{$_}",
184 "\\pgfsetlayers{" . join(',', @layers) . "}",
192 LaTeX::TikZ::Mod::Formatted->new(
194 content => $self->name,
198 LaTeX::TikZ::Interface->register(
203 __PACKAGE__->new(name => $name, @_);
207 __PACKAGE__->meta->make_immutable(
208 inline_constructor => 0,
213 Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
215 You can contact me by mail or on C<irc.perl.org> (vincent).
219 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>.
220 I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
224 You can find documentation for this module with the perldoc command.
228 =head1 COPYRIGHT & LICENSE
230 Copyright 2010 Vincent Pit, all rights reserved.
232 This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
236 1; # End of LaTeX::TikZ::Mod::Layer