GD::Graph is a perl5 module to create charts using the GD
module.

`GD::Graph::lines'
   Create a line chart.

`GD::Graph::bars'
   Create a bar chart.

`GD::Graph::points'
   Create an chart, displaying the data as points.

`GD::Graph::linespoints'
   Combination of lines and points.

`GD::Graph::area'
   Create a graph, representing the data as areas under a
   line.

`GD::Graph::mixed'
   Create a mixed type graph, any combination of the above.

`GD::Graph::pie'
   Create a pie chart.