space between first slice and last slice in degrees

Whether or not to 'invert' the swirl. In an inverted swirl, the labels are on the outside and the slices are lines rather than real surfaces.
Note, that the invert property is only active when labels are visible (labelsVisible=1)

Overriding default value: now FALSE

plotBy - items - this is default, it results in slices that are colored by items and a legend that is organized by labels on the slices
plotBy - series - it results in slices where slices of the same series are the same color, and legend shows labels for each series (not labels on the slices)

Return an array of labels to display within the Legend box.
Default implementation is to return a list of series names.

Given a logical value, return the text to use for an axis label. Subclasses can override this for custom behavior.

Indicates that this chart has no axes and associated grids

Indicates that this chart supports "show multiples" mode.

Do not show 3-D plot area.

Draw data series for this chart. This is implemented by subclasses. group is the SVG container for the chart components.