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

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.

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