Updating a Histogram?

[arwelbath]

Hi,
I am plotting a simple Histogram, and what I would like to do is to update the graph as new data is obtained. The updates are never frequent, and so there's no need for any flashy, super-fast dynamic stuff.

At the moment I'm creating a dataset....

Code: Select all

    public IntervalXYDataset makeIntervalXYDataset() {
        HistogramDataset dataset = new HistogramDataset();
        return dataset;
    }

..adding a seried to it (dataset.addSeries(......) ), then using this to make a graph...

Code: Select all

    public ChartPanel MakeErrorsHistogramChart(IntervalXYDataset dataset) {
    
         JFreeChart chart = ChartFactory.createHistogram(
             "",
             null,
             null,
             dataset,
             PlotOrientation.VERTICAL,
             true,
             false,
             false
         );         
         chart.getXYPlot().setForegroundAlpha(0.75f);
         final ChartPanel panel = new ChartPanel(chart);
         return panel;
    };

Now, to update the graph, I'd be happy with just clearing the initial series, and adding another one, but there isn't any kind of 'removeSeries' method for HistogramDataset.

So, does anyone know of a way to update a Histogram, other than to make a completely new graph?
Cheers,
Arwel

[david.gilbert]

There is another implementation that will support the updating you want, I think. Try SimpleHistogramDataset instead of HistogramDataset.

[arwelbath]

Thanks David. I'll give it a go...