Sierpinski curve: Difference between revisions
Added Perl example
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SqrtNegInf (talk | contribs) (Added Perl example) |
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</lang>
=={{header|Perl}}==
<lang perl>use strict;
use warnings;
use SVG;
use List::Util qw(max min);
use constant pi => 2 * atan2(1, 0);
my $rule = 'XF+F+XF--F--XF+F+X';
my $S = 'F--F--XF--F--XF';
$S =~ s/X/$rule/g for 1..5;
my (@X, @Y);
my ($x, $y) = (0, 0);
my $theta = pi/4;
my $r = 6;
for (split //, $S) {
if (/F/) {
push @X, sprintf "%.0f", $x;
push @Y, sprintf "%.0f", $y;
$x += $r * cos($theta);
$y += $r * sin($theta);
}
elsif (/\+/) { $theta += pi/4; }
elsif (/\-/) { $theta -= pi/4; }
}
my ($xrng, $yrng) = ( max(@X) - min(@X), max(@Y) - min(@Y));
my ($xt, $yt) = (-min(@X) + 10, -min(@Y) + 10);
my $svg = SVG->new(width=>$xrng+20, height=>$yrng+20);
my $points = $svg->get_path(x=>\@X, y=>\@Y, -type=>'polyline');
$svg->rect(width=>"100%", height=>"100%", style=>{'fill'=>'black'});
$svg->polyline(%$points, style=>{'stroke'=>'orange', 'stroke-width'=>1}, transform=>"translate($xt,$yt)");
open my $fh, '>', 'sierpinski-curve.svg';
print $fh $svg->xmlify(-namespace=>'svg');
close $fh;</lang>
See: [https://github.com/SqrtNegInf/Rosettacode-Perl5-Smoke/blob/master/ref/sierpinski-curve.svg sierpinski-curve.svg] (offsite SVG image)
=={{header|Perl 6}}==
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