From: Vincent Pit <vince@profvince.com>
Date: Wed, 21 Jul 2010 14:56:49 +0000 (+0200)
Subject: Introduce LaTeX::TikZ::Set::Arc
X-Git-Tag: v0.01~25
X-Git-Url: http://git.vpit.fr/?p=perl%2Fmodules%2FLaTeX-TikZ.git;a=commitdiff_plain;h=1918fdf5100058cd6a4281bc8b04ec8977841e5e

Introduce LaTeX::TikZ::Set::Arc
---

diff --git a/MANIFEST b/MANIFEST
index a9a373a..9d59a92 100644
--- a/MANIFEST
+++ b/MANIFEST
@@ -22,6 +22,7 @@ lib/LaTeX/TikZ/Point.pm
 lib/LaTeX/TikZ/Point/Math/Complex.pm
 lib/LaTeX/TikZ/Scope.pm
 lib/LaTeX/TikZ/Set.pm
+lib/LaTeX/TikZ/Set/Arc.pm
 lib/LaTeX/TikZ/Set/Circle.pm
 lib/LaTeX/TikZ/Set/Line.pm
 lib/LaTeX/TikZ/Set/Mutable.pm
diff --git a/Makefile.PL b/Makefile.PL
index cb0515a..5625d46 100644
--- a/Makefile.PL
+++ b/Makefile.PL
@@ -12,13 +12,15 @@ my $dist = 'LaTeX-TikZ';
 $file = "lib/$file.pm";
 
 my %PREREQ_PM = (
- 'Any::Moose'   => 0,
- 'Carp'         => 0,
- 'List::Util'   => 0,
- 'Mouse'        => '0.63', # register_type_constraint
- 'Scope::Guard' => 0,
- 'Sub::Name'    => 0,
- 'constant'     => 0,
+ 'Any::Moose'    => 0,
+ 'Carp'          => 0,
+ 'List::Util'    => 0,
+ 'Math::Complex' => 0,
+ 'Math::Trig'    => 0,
+ 'Mouse'         => '0.63', # register_type_constraint
+ 'Scope::Guard'  => 0,
+ 'Sub::Name'     => 0,
+ 'constant'      => 0,
 );
 
 my %META = (
diff --git a/lib/LaTeX/TikZ/Interface.pm b/lib/LaTeX/TikZ/Interface.pm
index 6496b06..0e902f5 100644
--- a/lib/LaTeX/TikZ/Interface.pm
+++ b/lib/LaTeX/TikZ/Interface.pm
@@ -66,6 +66,7 @@ sub load {
  require LaTeX::TikZ::Set::Polyline;  # polyline, closed_polyline
  require LaTeX::TikZ::Set::Rectangle; # rectangle
  require LaTeX::TikZ::Set::Circle;    # circle
+ require LaTeX::TikZ::Set::Arc;       # arc
 
  require LaTeX::TikZ::Mod::Raw;       # raw_mod
 
diff --git a/lib/LaTeX/TikZ/Set/Arc.pm b/lib/LaTeX/TikZ/Set/Arc.pm
new file mode 100644
index 0000000..3ac58e0
--- /dev/null
+++ b/lib/LaTeX/TikZ/Set/Arc.pm
@@ -0,0 +1,101 @@
+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
diff --git a/t/00-load.t b/t/00-load.t
index 33cfe89..11f9eef 100644
--- a/t/00-load.t
+++ b/t/00-load.t
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 30;
+use Test::More tests => 31;
 
 BEGIN {
  use_ok( 'LaTeX::TikZ' );
@@ -25,6 +25,7 @@ BEGIN {
  use_ok( 'LaTeX::TikZ::Point::Math::Complex' );
  use_ok( 'LaTeX::TikZ::Scope' );
  use_ok( 'LaTeX::TikZ::Set' );
+ use_ok( 'LaTeX::TikZ::Set::Arc' );
  use_ok( 'LaTeX::TikZ::Set::Circle' );
  use_ok( 'LaTeX::TikZ::Set::Line' );
  use_ok( 'LaTeX::TikZ::Set::Mutable' );
diff --git a/t/01-api.t b/t/01-api.t
index dc15124..106ebbe 100644
--- a/t/01-api.t
+++ b/t/01-api.t
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => 5 + 15 + 12;
+use Test::More tests => 5 + 16 + 12;
 
 use LaTeX::TikZ;
 
@@ -31,7 +31,7 @@ is(prototype('Tikz'), '', 'main::Tikz is actually a constant');
 my @methods = qw/
  raw
  path seq
- point line polyline closed_polyline rectangle circle
+ point line polyline closed_polyline rectangle circle arc
  raw_mod
  clip layer
  width color fill
diff --git a/t/12-geo.t b/t/12-geo.t
index 3a7eef7..afbc1e7 100644
--- a/t/12-geo.t
+++ b/t/12-geo.t
@@ -3,7 +3,7 @@
 use strict;
 use warnings;
 
-use Test::More tests => (11 + 2 * 5) + 2 * (10 + 2 * 3);
+use Test::More tests => (14 + 2 * 5) + 2 * (11 + 2 * 3);
 
 use Math::Complex;
 
@@ -188,3 +188,33 @@ eval {
 };
 like $@, qr/isn't a non-negative real number/,
                               'creating a circle with a negative radius croaks';
+
+# Arc
+
+$tikz = Tikz->formatter(
+ format => "%.03f"
+);
+
+my $arc = eval {
+ Tikz->arc(1, i, $o);
+};
+is $@, '', 'creating a simple arc doesn\'t croak';
+
+check $arc, 'simple arc', <<'RES';
+\begin{scope}
+\clip (0.969cm,0.000cm) -- (1.085cm,0.000cm) -- (1.032cm,0.335cm) -- (0.878cm,0.638cm) -- (0.638cm,0.878cm) -- (0.335cm,1.032cm) -- (0.000cm,1.085cm) -- (0.000cm,0.969cm) -- cycle ;
+\draw (0.000cm,0.000cm) circle (1.000cm) ;
+\end{scope}
+RES
+
+eval {
+ Tikz->arc(0, 1);
+};
+my $err = quotemeta 'Tikz->arc($first_point, $second_point, $center)';
+like $@, qr/^$err/, 'creating an arc from only two points croaks';
+
+eval {
+ Tikz->arc(0, 1, i);
+};
+like $@, qr/The two first points aren't on a circle of center the last/,
+         'creating an arc with two points not on a circle of center c croaks';