An extension of XYBarRenderer that displays bars for different
series values at the same x next to each other. The assumption here is
that for each x (time or else) there is a y value for each series. If
this is not the case, there will be spaces between bars for a given x.
This renderer does not include code to calculate the crosshair point for the
plot.
This renderer does not include code to calculate the crosshair point for the plot.