use PNGgraph::lines;

print STDERR "Processing sample 5-4\n";

# The reverse is in here, because I thought the falling line was
# depressing, but I was too lazy to retype the data set

@data = read_data("sample54.dat")
    or die "Cannot read data from sample54.dat";

$my_graph = new PNGgraph::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 => 'auto',

    box_axis => 0,
    line_width => 2,
    x_label_position => 1/2,
    r_margin => 15,
);

$my_graph->set_legend('Thanks to Scott Prahl');

$my_graph->plot_to_png( "sample54.png", \@data );

exit;

sub read_data
{
    my $fn = shift;
    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');
            push @{$d[$i]}, $row[$i];
        }
    }

    close (ZZZ);

    return @d;
}

