real_shell.pl

#!/usr/bin/perl

# Author: Daniel "Trizen" Șuteu
# License: GPLv3
# Date: 30 April 2014
# Website: https://github.com/trizen

use 5.010;
use strict;
use warnings;
use GD::Simple;

my $img = 'GD::Simple'->new(500, 600);

sub t($) {
    $img->turn(shift);
}

sub l($) {
    $img->line(shift);
}

sub c($) {
    $img->fgcolor(shift);
}

$img->clear;
$img->moveTo(250, 300);    # hopefully, at the center of the image

my $loop = 5;
for (my $j = 0.01 ; $j <= $loop ; $j += 0.01) {
    l $j;
    t $loop- $j + 1;
}

my $image_name = "shell.png";

open my $fh, '>', $image_name or die $!;
print {$fh} $img->png;
close $fh;