pointDrag (while dragging) / pointDragEnd (commit or cancel) payload.
pointDrag
pointDragEnd
Optional
pointDragEnd only: Escape / pointer cancel restored oldValue
oldValue
Line: sample index; scatter: point index in the input arrays
Value before the drag (line x = sample index on charts without x)
x
Line series index / scatter series id
pointDrag(while dragging) /pointDragEnd(commit or cancel) payload.