use strict; use warnings;
use Math::Fractal::Curve;

# This generates a von Koch-curve.
my $generator =
[
	[0,   0,         1/3, 0        ],
	[1/3, 0,         1/2, sqrt(5)/6],
	[1/2, sqrt(5)/6, 2/3, 0        ],
	[2/3, 0,         1,   0        ],
];

# New curve generator
my $curve_gen = Math::Fractal::Curve->new(generator => $generator);

# New curve
my $curve = $curve_gen->line(
	start => [-2, 0],
	end   => [2, 0],
);

my $depth = 5;

my $edges = $curve->fractal($depth);

##</code><code>##

# append to the other part of the script	
use Imager;

# Generate sensible filename for image.
my $filename = sprintf('Koch-Depth%02i.png', $depth);

# Image dimensions
my $max_x = 1000;
my $max_y = 400;

my $img = Imager->new(xsize => $max_x, ysize => $max_y);
my $color = Imager::Color->new( 0, 0, 255 ); # blue

# Scale dimensions by 200.
@$_ = map $_*200, @$_ foreach @$edges;

foreach (@$edges) {
	$img->line(
		color => $color,
		x1 => $max_x / 2  + $_->[0], # start
		y1 => $max_y - 50 - $_->[1],
		x2 => $max_x / 2  + $_->[2], # end
		y2 => $max_y - 50 - $_->[3],
	);
}

$img->write(file=>$filename) or
        die $img->errstr;