15.18.1. Problem

15.18.2. Solution

use GD::Graph::lines;                      # bars, lines, points, pie
$chart = GD::Graph::lines->new(480,320);
$chart->set(x_label => $X_AXIS_LABEL,      # no axes for pie chart
            y_label => $Y_AXIS_LABEL,
            title   => $GRAPH_TITLE,
            # ... more options possible
           );
$plot = $chart->plot($DATA_REF) or die $chart->error;
# do something with $plot->png which is the image in PNG form

Here is a sample data structure (every row must have the same number of values):

$DATA_REF = [
              [ 1990, 1992, 1993, 1995, 2002 ],      # X values
              [ 10,   15,   18,   20,   25   ],      # first dataset
              [ 9,    undef,17,   undef,12   ],      # second dataset
              # ...
            ];

15.18.3. Discussion