Arguments for the
The point index in the series.
Applicable only to the Pie, Donut, and
ChartComponent that triggered the event.
An object containing the series options.
The index of the series in the parent Chart.
The text of the legend item.
true if the event was prevented
by any of its subscribers.
true if the default action has been prevented.
If called, the series visibility is not toggled
as a result of clicking the legend item.