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jfreechart

Using JFreeChart Scatter Plots is there a Way to Subdivide Styles for Data Sets?

I am using JFreeChart to render a scatter plot with a couple thousand data points. I control the appearance/style of each ScatterPlotDataset by attaching a suitable XYLineAndShapeRendererper to each data set; eg. points in data set 1 appear as circles and points in data set 2 appear as squares. I would like the user to be able to dynamically assign a sub-style per point in each data set; eg. if the data set were books then the user might wish to color fiction blue and nonfiction red. Is there a way to do this without defining a new data set for each sub style?

Incidentally I am carting with XYPlot but I can switch to another chart type if necessary.

Thank you in advance.

Solution

  • You might consider the approaches mentioned here. The first implements DrawingSupplier, as shown here:

    class DefaultDrawingSupplier implements DrawingSupplier…

    The second extends DefaultDrawingSupplier, as shown here, to achieve a similar effect.

    Paint[] paintArray = {…};
plot.setDrawingSupplier(new DefaultDrawingSupplier(
    paintArray, …
    DefaultDrawingSupplier.DEFAULT_SHAPE_SEQUENCE));

    Of course, you can always override getItemPaint(), as shown here.