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#!/usr/bin/env perl

use strict;
use warnings;

use Test::More tests => 6;

use lib '../lib';
use Math::Polygon::Transform  qw/polygon_rotate/;
use Math::Polygon::Calc       qw/polygon_string polygon_format/;

my @p = ([0,0], [1,1], [-2,1], [-2,-2], [0,0]);

# format fights rounding errors
sub round($) { my $x = sprintf "%.4f", $_[0]; $x =~ s/\.?0+$//; $x }
sub rotate(@) { polygon_format \&round, polygon_rotate @_ }

is( polygon_string(rotate degrees => 0, @p)
  , "[0,0], [1,1], [-2,1], [-2,-2], [0,0]"
  , 'identity'
  );

is( polygon_string(rotate radians => 0, @p)
  , "[0,0], [1,1], [-2,1], [-2,-2], [0,0]"
  , 'identity'
  );

is( polygon_string(rotate degrees => 0, center => [0,0], @p)
  , "[0,0], [1,1], [-2,1], [-2,-2], [0,0]"
  , 'identity'
  );

is( polygon_string(rotate degrees => +90, @p)
  , "[0,0], [1,-1], [1,2], [-2,2], [0,0]"
  , 'rotate +90'
  );

is( polygon_string(rotate degrees => -90, @p)
  , "[0,0], [-1,1], [-1,-2], [2,-2], [0,0]"
  , 'rotate -90'
  );

is( polygon_string(rotate degrees => -90, center => [3,4], @p)
  , "[7,1], [6,2], [6,-1], [9,-1], [7,1]"
  , 'rotate 90 around [3,4]'
  );