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Add a ChartMouseListener to your ChartPanel and examine the ChartEntity associated with the ChartMouseEvent.

Duplicate of this question.

Try returning an empty shape for the undesired points, e.g. ShapeUtilities.createUpTriangle(0).

You might try a stacked bar chart; StackedBarChartDemo7 in the gallery looks relevant.

Add a ChartMouseListener; examine the ChartEntity subclass to determine which point(s) should return a different shape from your implementation of getItemShape().

You can control zooming and panning with the mouse, as suggested here, or by evoking the desired handlers, as suggested here.

Verify that your code is correctly synchronized.

gw1500se wrote:Would this be "instead of" or "in addition to?"

Instead. ChartPanel::getToolTipText queries the relevant ChartEntity for you, so you can focus on formatting.

Apply an XYToolTipGenerator such as the StandardXYToolTipGenerator to your renderer, as shown in ChartFactory.createTimeSeriesChart(). Your implementation of generateToolTip() will have access to the relevant dataset, series and item.

If you're using JFreeChart 1.0.19, verify that both jfreechart-1.0.19.jar and jcommon-1.0.23.jar are in your class path when compiling.
If you're using JFreeChart 1.5, see Migration from JFreeChart 1.0.x.

Yes. Override the renderer's getItemShape() method. A typical example may be found here.

katherin04 wrote:There is no setFont() method in DefaultCategoryDataset?

Nor should there be. The particular font used is an attribute of the view. In contrast, a dataset is a model of the data displayed by the view. The separation is intentional.

Search the forum for the keyword subtask, for example.

Search the forum for DrawingSupplier, for example.

NB: "When migrating from JFreeChart 1.0.x to JFreeChart 1.5.0…all the classes from JCommon that are used by JFreeChart have [been] integrated within the JFreeChart jar file within a different package than before (you will need to change your imports)."