BackwardForecastLength: Double;
The BackwardForecastLength property determines a length of backward series values forecast.
This example assumes that there is the Chart object of the IChart type.
Sub TrendLine;
Var
Chart: IChart;
Begin
Chart.Series.Item(0).TrendLines.Item(0).BackwardForecastLength := 3;
End Sub TrendLine;
After executing the example the trend line of the specified series is extended three points backwards.
See also: