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#!/usr/bin/env perl
use strict;
use warnings;

use Data::Turtle ();
use GD ();

my ( $width, $height ) = ( 500, 500 );

my $img = GD::Image->new( $width, $height );

my %color = (
    white => $img->colorAllocate( 255, 255, 255 ),
    black => $img->colorAllocate( 0, 0, 0 ),
);

$img->transparent($color{white});
$img->interlaced('true');

my $turtle = Data::Turtle->new(
    width  => $width,
    height => $height,
);

$turtle->pen_up;
$turtle->right(45);
$turtle->forward(10);
$turtle->goto( 100, 100 );
$turtle->mirror;
$turtle->backward(10);
#my ( $x, $y, $heading, $pen_status, $pen_color, $pen_size ) = $turtle->get_state;
#$turtle->set_state( $x, $y, $heading, $pen_status, $pen_color, $pen_size );
$turtle->pen_down;
for my $i ( 1 .. 4 ) {
    my @line = $turtle->forward(50);
    if ( $turtle->pen_down ) {
        $img->setThickness( $line[5] );
        $img->line( @line[ 0 .. 3 ], $color{ $line[4] } );
    }
    $turtle->right(90);
}

print $img->png; # perl synopsis-gd > synopsis-gd.png