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Chart::PNGgraph is a perl5 module to create and display
PNG output for a graph.  The following classes for graphs
with axes are defined:

Chart::PNGgraph::lines
    Create a line chart.

Chart::PNGgraph::bars
    Create a bar chart.

Chart::PNGgraph::points
    Create an chart, displaying the data as points.

Chart::PNGgraph::linespoints
    Combination of lines and points.

Chart::PNGgraph::area
    Create a graph, representing the data as areas under a
    line.

Chart::PNGgraph::mixed
    Create a mixed type graph, any combination of the
    above. At the moment this is fairly limited. Some of
    the options that can be used with some of the
    individual graph types won't work very well. Multiple
    bar graphs in a mixed graph won't display very nicely.

Additional types:

Chart::PNGgraph::pie
    Create a pie chart.