I have a graph with a group of barcharts, I want each bar (column) to get a point on it. ie. I have:

• Some labels (one for each group of bar charts)
• Some bar chart data (three series of data that result in groups of three bar charts)
• Some points I would like to place on each bar

However, given code like this:

   my $gd = $graph->plot(
      [ \@labels, @bar_series, \@bar_points ],
   );
[download]

I end up with *one* point on each bar chart grouping, rather than a point per bar. It doesn't look like GD::Graph is flexible enough to do this, so I started looking in to how to hack the image that GD::Graph is creating directly, so that I can draw my own arc() with GD.

However, I can't see how to do this, ie. I'm not sure how to "intrude" into GD::Graph's instance of GD to make a call to arc().

Any advice would be appreciated - either about how to do this properly with GD::Graph, or how to hack GD::Graph's GD to do it with GD.

thanks!
Nathan

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