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Represents a trendline in a chart.
public interface ITrendline
  Public Interface ITrendline
  | Name | Description | 
|---|---|
| Backward | Gets or sets the number of periods (or units on a scatter chart) that the trendline extends backward.  | 
      
| Border | Gets an IBorder object that represents the border of the object.  | 
      
| DataLabel | Gets an IDataLabel object that represents the data label associated with the trendline.  | 
      
| DisplayEquation | Gets or sets a value indicating whether the equation for the trendline is displayed on the chart (in the same data label as the R-squared value).  | 
      
| DisplayRSquared | Gets or sets a value indicating whether the R-squared value of the trendline is displayed on the chart (in the same data label as the equation).  | 
      
| Format | Gets the IChartFormat object.  | 
      
| Forward | Gets or sets the number of periods (or units on a scatter chart) that the trendline extends forward.  | 
      
| Index | Gets a value that represents the index number of the object within the collection of similar objects.  | 
      
| Intercept | Gets or sets the point where the trendline crosses the value axis.  | 
      
| Order | Gets or sets a value that represents the trendline order (an integer greater than 1) when the trendline type is Polynomial.  | 
      
| Period | Gets or sets the period for the moving-average trendline. Can be a value from 2 through 255.  | 
      
| Type | Gets or sets a TrendlineType value that represents the trendline type.  | 
      
| Name | Description | 
|---|---|
| ClearFormats() | Clears the formatting of the object.  | 
      
| Delete() | Deletes the object.  |