BarGroupingType

Defines the way multiple series of bars are renderered per domain.

• grouped
  Render bars for each series that shares a domain value side-by-side.

• groupedStacked
  Render bars for each series that shares a domain value in a stack, ordered in the same order as the series list.

• stacked
  Render bars for each series that shares a domain value in a group of bar stacks. Each stack will contain all the series that share a series category.