### example 29 Stacked Area
d1 <- dPlot(
  UnitSales ~ Month,
  groups = "Channel",
  data = subset(data, Owner %in% c("Aperture","Black Mesa")),
  type = "area"
)
d1$xAxis(type = "addCategoryAxis", orderRule = "Date")
d1$yAxis(type = "addMeasureAxis")
d1$legend(
  x = 200,
  y = 10,
  width = 500,
  height = 20,
  horizontalAlign = "right"
)
d1