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;
24 use Any::Moose 'Util::TypeConstraints';
26 with 'LaTeX::TikZ::Mod';
34 subtype 'LaTeX::TikZ::Mod::LevelList'
35 => as 'ArrayRef[LaTeX::TikZ::Mod::Layer]';
37 coerce 'LaTeX::TikZ::Mod::LevelList'
39 => via { [ __PACKAGE__->new(name => $_) ] };
41 coerce 'LaTeX::TikZ::Mod::LevelList'
42 => from 'ArrayRef[Str]'
43 => via { [ map __PACKAGE__->new(name => $_), @$_ ] };
47 isa => 'LaTeX::TikZ::Mod::LevelList',
49 default => sub { [ ] },
53 sub above { @{$_[0]->_above} }
57 isa => 'LaTeX::TikZ::Mod::LevelList',
59 default => sub { [ ] },
63 sub below { @{$_[0]->_below} }
70 builder => '_build_score',
76 my ($orig, $self, %args) = @_;
78 my $name = $args{name};
80 $self->meta->find_attribute_by_name('name')
81 ->type_constraint->assert_valid($name);
82 my $layer = $layers{$name};
84 confess("Can't redefine layer '$name'") if keys(%args) > 1;
89 return $self->$orig(%args);
95 my $name = $self->name;
96 $layers{$name} = $self;
97 Scalar::Util::weaken($layers{$name});
103 delete $layers{$self->name};
109 ref($self) . '/' . $self->name;
112 sub cover { $_[0]->name eq $_[1]->name }
120 my $name = $layer->name;
122 return $score{$name} if exists $score{$name};
125 for ($layer->above) {
128 $min = $cur if not defined $min or $min < $cur;
135 for ($layer->below) {
138 $max = $cur if not defined $max or $max < $cur;
146 confess("Order mismatch for $name") unless $min < $max;
147 $score{$name} = ($min + $max) / 2;
149 my $i = List::Util::max(values %score);
150 $score{$_} = ++$i for $name, @higher;
152 } elsif (defined $max) {
153 my $i = List::Util::min(values %score);
154 $score{$_} = --$i for @lower, $name;
157 $score{$_} = ++$i for @lower, $name, @higher;
168 local %score = (main => 0);
172 my @layers = sort { $score{$a} <=> $score{$b} }
173 map { ref() ? $_->name : $_ }
176 my @intro = map "\\pgfdeclarelayer{$_}",
182 "\\pgfsetlayers{" . join(',', @layers) . "}",
190 LaTeX::TikZ::Mod::Formatted->new(
192 content => $self->name,
196 use LaTeX::TikZ::Interface layer => sub {
200 __PACKAGE__->new(name => $name, @_);
203 __PACKAGE__->meta->make_immutable(
204 inline_constructor => 0,
209 Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
211 You can contact me by mail or on C<irc.perl.org> (vincent).
215 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>.
216 I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
220 You can find documentation for this module with the perldoc command.
224 =head1 COPYRIGHT & LICENSE
226 Copyright 2010 Vincent Pit, all rights reserved.
228 This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
232 1; # End of LaTeX::TikZ::Mod::Layer