Introduce LaTeX::TikZ::Set::Arc

[perl/modules/LaTeX-TikZ.git] / lib / LaTeX / TikZ / Set / Arc.pm

diff --git a/lib/LaTeX/TikZ/Set/Arc.pm b/lib/LaTeX/TikZ/Set/Arc.pm
new file mode 100644 (file)
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+++ b/lib/LaTeX/TikZ/Set/Arc.pm
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+package LaTeX::TikZ::Set::Arc;
+
+use strict;
+use warnings;
+
+=head1 NAME
+
+LaTeX::TikZ::Set::Arc - A combined set object representing an arc.
+
+=head1 VERSION
+
+Version 0.01
+
+=cut
+
+our $VERSION = '0.01';
+
+use Carp          ();
+use Math::Complex ();
+use Math::Trig    ();
+
+use LaTeX::TikZ::Point;
+
+use LaTeX::TikZ::Set::Circle;
+use LaTeX::TikZ::Set::Polyline;
+
+use LaTeX::TikZ::Tools;
+
+use Any::Moose 'Util::TypeConstraints' => [ 'find_type_constraint' ];
+
+my $ltp_tc = find_type_constraint('LaTeX::TikZ::Point::Autocoerce');
+
+use LaTeX::TikZ::Interface arc => sub {
+ shift;
+ Carp::confess('Tikz->arc($first_point, $second_point, $center)') if @_ < 3;
+ my ($a, $b, $c) = @_;
+
+ for ($a, $b, $c) {
+  my $p = $ltp_tc->coerce($_);
+  $_ = Math::Complex->make($p->x, $p->y);
+ }
+
+ my $r = abs($a - $c);
+ Carp::confess("The two first points aren't on a circle of center the last")
+                             unless LaTeX::TikZ::Tools::numeq(abs($b - $c), $r);
+
+ my $set = LaTeX::TikZ::Set::Circle->new(
+  center => $c,
+  radius => $r,
+ );
+
+ my $factor = 1/32;
+
+ my $theta  = (($b - $c) / ($a - $c))->arg;
+ my $points = int(abs($theta) / abs(Math::Trig::acos(0.95)));
+ $theta    /= $points + 1;
+ my $rho    = (1 / cos($theta)) / (1 - $factor);
+
+ my $ua = ($a - $c) * (1 - $factor) + $c;
+ my $ub = ($b - $c) * (1 - $factor) + $c;
+
+ my @outside = map { $_ * $rho + $c } (
+  $a - $c,
+  (map { ($a - $c) * Math::Complex->emake(1, $_ * $theta) } 1 .. $points),
+  $b - $c,
+ );
+
+ $set->clip(
+  LaTeX::TikZ::Set::Polyline->new(
+   points => [ $ua, @outside, $ub ],
+   closed => 1,
+  ),
+ );
+};
+
+=head1 AUTHOR
+
+Vincent Pit, C<< <perl at profvince.com> >>, L<http://www.profvince.com>.
+
+You can contact me by mail or on C<irc.perl.org> (vincent).
+
+=head1 BUGS
+
+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>.
+I will be notified, and then you'll automatically be notified of progress on your bug as I make changes.
+
+=head1 SUPPORT
+
+You can find documentation for this module with the perldoc command.
+
+    perldoc LaTeX::TikZ
+
+=head1 COPYRIGHT & LICENSE
+
+Copyright 2010 Vincent Pit, all rights reserved.
+
+This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
+
+=cut
+
+1; # End of LaTeX::TikZ::Set::Arc