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This would be very nice, and would match functionality already available for category plots. I've added it to the feature request list :) https://sourceforge.net/tracker/?func=detail&aid=3123998&group_id=15494&atid=365494 As far as I can tell, this will require a change to the signature of AbstractX...

Thanks, this was very useful. I've made some slight tweaks so that maxZ is recalculated if the chart is zoomed / unzoomed, as well as using RendererState to calculate and cache maxZ as suggested in the other posts. public class BubbleRenderer extends AbstractXYItemRenderer implements XYItemRenderer ...

I noticed that the XYDifferenceRenderer will not generate tooltips unless I set
setShapesVisible to true. In my case I would like tooltips, but not visible shapes.

Is this a bug? Or am I supposed to use a specific type of shape so I do not get a box/triangle?

thanks