generateToolTip(XYDataset dataset, int series, int item) Generates the tooltip text for the specified item.
Parameters: dataset - the dataset (null not permitted). Parameters: series - the series index (zero-based). Parameters: item - the item index (zero-based).
Generates the tooltip text for the specified item.
Parameters: dataset - the dataset (null not permitted). Parameters: series - the series index (zero-based). Parameters: item - the item index (zero-based). The tooltip text (possibly null).