ChartEntity problem cast to XYItemEntity jfreechart-1.0.13

[pdvmipv]

Hi

i hava problem to make cast from ChartEntity to XYItemEntity with the last release of
Jfreecharrt (1.0.13).

Following the code working fine using Jfreecharrt 1.0.12

Code: Select all

        XYItemEntity entity = (XYItemEntity) viewerPlot.getChartPanel().getEntityForPoint( 
                event.getTrigger().getX(), event.getTrigger().getY());

With the new release i have got this error:

Exception in thread "AWT-EventQueue-0" java.lang.ClassCastException: org.jfree.chart.entity.PlotEntity cannot be cast to org.jfree.chart.entity.XYItemEntity

Can you help me to resolve this issue?

Thanks

[MitchBuell]

There are multiple types of ChartEntities. JFreeChart 1.0.13 added some more too. You should at least make sure the ChartEntity that you get is an instance of an XYItemEntity.

Code: Select all

ChartEntity entity = viewerPlot.getChartPanel().getEntityForPoint(event.getTrigger().getX(), event.getTrigger().getY());
if (entity instanceof XYItemEntity)
{
     XYItemEntity xyEntity = (XYItemEntity) entity;
}

[pdvmipv]

ok but,
with the old version the code:

Code: Select all

viewerPlot.getChartPanel().getEntityForPoint(event.getTrigger().getX(), event.getTrigger().getY());

return a XYItemEntity, in the new version the type is PlotEntity.

What can i do?

I need to use the function entity.getDataset(), and i can only have with XYItemEntity.

[paradoxoff]

As MitchBuell mentioned, the PlotEntity is a new entity class in 1.0.13. This entity contains the entire data area as hot spot. If you click anywhere in the data area, you will now get a PlotEntity where you got null before. However, if an XYItemEntity is located at the point of the mouse click, you should still get the XYItemEntity since an XYItemEntity will be placed on top of the PlotEntity.
Is it possible that you have simply missed the XYItemEntity by a few pixels? Prior to 1.0.13, you would get a null entity. I assume that you handle that case, though your snippets do not indicate that. In 1.0.13, you will get a non-null entity if you click anywhere on the data area.

[pdvmipv]

Ok resolved as coded below.
Thanks

Code: Select all

//        1.0.12 Version
//        XYItemEntity entity = (XYItemEntity) viewerPlot.getChartPanel().getEntityForPoint(
//                event.getTrigger().getX(), event.getTrigger().getY());
//       Integer indexOfAxis = 0;
//        if (entity != null) {
//                         indexOfAxis = viewerPlot.getIndexDataset((XYSeriesCollection) entity.getDataset());
//        }

//    1.0.13 Version
        ChartEntity entity = viewerPlot.getChartPanel().getEntityForPoint(
                event.getTrigger().getX(), event.getTrigger().getY());

        XYItemEntity xyItemEntity = null;

        Integer indexOfAxis = 0;
        if (entity != null) {
            if (entity instanceof XYItemEntity) {
                xyItemEntity = (XYItemEntity) entity;

                indexOfAxis = viewerPlot.getIndexDataset((XYSeriesCollection) xyItemEntity.getDataset());
            }
        }
]