Interface: GroupLabelFormatterParams
What a group name is handed: the value of its own level and the run of categories it covers. A group has no tick index of its own — it stands over a range of them — so it gets its own params instead of the tick label's.
Properties
end
end:
number
Domain index of the last category the group covers.
level
level:
number
Row number: 0 is the outermost row, the one furthest from the plot.
start
start:
number
Domain index of the first category the group covers.
value
value:
unknown
Raw value of the level — the tuple element this row is built from.