This sample illustrates an area series with negative values. Data points with negative values are shown here.
In this example, you can see how to render an area series with negative values. Similar to line type series, but the area gets closed and filled with series color. You can use border and fill properties to customize the area. Also, the legend is enabled with the shape of the series type.
Tooltips are enabled in this example. To see a tooltip in action, hover over or tap on the chart.
More information on the area negative points can be found in this documentation section.