An object that represents the state information that will be passed to any custom {@link LegendLabelsFormatter} to allow for custom strings to be rendered as the legendlabels.
See the {@link LegendLabelsFormatter#format(LegendLabelsData)} method for more details on the capabilitiesthat custom formatters can provide.
@author squinn@moxiegroup.com (Shawn Quinn)
@since 1.3.0