includeArea property
Configures whether an area skirt representing the data will be drawn.
An area skirt will be drawn from the line for each series, down to the domain axis. It will be layered underneath the primary line on the chart.
The area skirt color will be a semi-transparent version of the series color, using areaOpacity as the opacity.
When stacking is enabled, the bottom of each area skirt will instead be the previous line in the stack. The bottom area will be drawn down to the domain axis.
Implementation
final bool includeArea;