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From: jc_usernet on 14 Feb 2010 22:18
Hello.
I am working with JFreeChart (1.0.13) and wish to modify the manner
the legend displays entries for the multiple XY time series.
I want to display 2 series on the graph with one entry into the
legend. The example is grouping a Max and a Min series which gives a
graph above and below an Avg series. As such I want them displayed
together under the name of "Max&Min".
My current code is;
--------------------
this.plot.setDataset( dataset_Index[i],
createDataset(dataset_DBColumnName[i]) );
this.plot.setRenderer( dataset_Index[i], dataset_Renderer[i] );

where plot is a class XYPlot
--------------------
I have tried setting the display name in the legend (which comes from
dataset_DBColumnName[i]) - the name of the generated series ) to null
and "" without success.
The first gives a run time error while the second makes a legend entry
with the "" string.

Is there a way I can control this legend entries while I create events
loading in these different series into the Dataset?
A possible work around (which I have not tried) is concatenation the 2
series (Min and Max) together, but a fly back line might occur (most
likely).

Regards JC.....
From: John B. Matthews on 15 Feb 2010 10:36
In article
<08df2d97-d6dc-400a-9a24-93dc48542ae5(a)f17g2000prh.googlegroups.com>,
jc_usernet <jc_usernet(a)aanet.com.au> wrote:

> I am working with JFreeChart (1.0.13) and wish to modify the manner
> the legend displays entries for the multiple XY time series. I want
> to display 2 series on the graph with one entry into the legend. The
> example is grouping a Max and a Min series which gives a graph above
> and below an Avg series. As such I want them displayed together
> under the name of "Max&Min".
> My current code is;
> --------------------
> this.plot.setDataset( dataset_Index[i],
> createDataset(dataset_DBColumnName[i]) );
> this.plot.setRenderer( dataset_Index[i], dataset_Renderer[i] );
>
> where plot is a class XYPlot
> --------------------
> I have tried setting the display name in the legend (which comes from
> dataset_DBColumnName[i]) - the name of the generated series ) to null
> and "" without success. The first gives a run time error while the
> second makes a legend entry with the "" string.
>
> Is there a way I can control this legend entries while I create
> events loading in these different series into the Dataset? A possible
> work around (which I have not tried) is concatenation the 2 series
> (Min and Max) together, but a fly back line might occur (most
> likely).

I've never combined legend items this way; I'd argue against it. Of
course, you can always add another legend:

LegendItemSource lis = new LegendItemSource() {
LegendItem li = new LegendItem("Min&Max");
LegendItemCollection lic = new LegendItemCollection();
{ lic.add(li); }
public LegendItemCollection getLegendItems() {
return lic;
}
};
chart.addLegend(new LegendTitle(lis));


<http://www.jfree.org/jfreechart/api/javadoc/org/jfree/chart/LegendItem.html>

--
John B. Matthews
trashgod at gmail dot com
<http://sites.google.com/site/drjohnbmatthews>
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