use GD::Graph::lines;
require 'save.pl';

print STDERR "Processing sample56 (experimental)\n";

my $path = $ENV{GDGRAPH_SAMPLES_PATH} ? $ENV{GDGRAPH_SAMPLES_PATH} : '';
@data = read_data("${path}sample54.dat")
    or die "Cannot read data from ${path}sample54.dat";

$my_graph = new GD::Graph::lines();

$my_graph->set( 
    x_label => 'Wavelength (nm)',
    y_label => 'Absorbance',
    title => 'Numerical X axis',

    y_min_value => 0,
    y_max_value => 2,
    y_tick_number => 8,
    y_label_skip => 4,

    x_tick_number => 14,
    x_min_value => 100,
    x_max_value => 800,
    x_ticks     => 1,
    x_tick_length => -4,
    x_long_ticks => 1,
    x_label_skip => 2,
    x_tick_offset => 2,

    no_axes => 1,
    line_width => 2,
    x_label_position => 1/2,
    r_margin => 15,

    transparent => 0,
);

$my_graph->set_legend('Thanks to Scott Prahl and Gary Deschaines');
$my_graph->plot(\@data);
save_chart($my_graph, 'sample56');


sub read_data
{
    my $fn = shift;
        local(*ZZZ);
    my @d = ();

    open(ZZZ, $fn) || return ();

    while (<ZZZ>)
    {
        chomp;
        my @row = split;

        for (my $i = 0; $i <= $#row; $i++)
        {
            undef $row[$i] if ($row[$i] eq 'undef');
            unshift @{$d[$i]}, $row[$i];
        }
    }

    close (ZZZ);

    return @d;
}

1;