Deviation renderer - drawing min/max as lines

[I82Much]

Hello all,

I am attempting to draw dashed lines along the top and bottom of a deviation renderer output. Right now the best idea I have to do that is to get the YIntervalSeries that backs the deviation renderer and make new XYSeries, one for the min, and one for the max, and then draw these series with a new renderer (StandardXYRenderer, for instance). This seems wasteful to me, as then the high/low data is duplicated.


For instance, here is the code I'm using to extract the mins and then draw the mins as a new series:

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private static XYDataset getMinFromInterval(YIntervalSeriesCollection dataset) {
        XYSeriesCollection lowDataset = new XYSeriesCollection();

        for (int i = 0; i < dataset.getSeriesCount(); i++) {
            YIntervalSeries series = dataset.getSeries(i);
            XYSeries lowVals = new XYSeries(series.getKey());
            for (int j = 0; j < series.getItemCount(); j++) {
                lowVals.add(series.getX(j), series.getYLowValue(j));
            }
            lowDataset.addSeries(lowVals);
        }

        return lowDataset;
    }

I then draw these as follows

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plot.setDataset(1, getMinFromInterval((YIntervalSeriesCollection) dataset));
        plot.setRenderer(1, new StandardXYItemRenderer());

Where plot is created as in the DeviationRendererDemo2 code.

Thanks for any help you can provide,

Nick

(The other thought that occurs to me is that I could extend the DeviationRenderer class, but that might be going a bit far)

[david.gilbert]

The other thought that occurs to me is that I could extend the DeviationRenderer class, but that might be going a bit far

I think that would be the right approach. All the data is there, and all you are looking for is a change in (or rather an addition to) the rendering...so modifying the renderer makes the most sense.

I think you'd need to change the block in the drawItem() method that starts with:

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if (isLinePass(pass)) {

...and get it to store an additional two lines in the State object, one for the lower bound and one for the upper bound - then at the end of each series, render the lines. It should work, although it isn't a completely straightforward change otherwise I'd do it myself right now.