# GrapeCity.Documents.Excel.Drawing.ITrendline ## Content

ITrendline Interface

Represents a trendline in a chart. A trendline shows the trend, or direction, of data in a series.

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.
DataLabel	Returns a IDataLabel object that represents the data label associated with the trendline.
DisplayEquation	Gets or sets whether to display the equation for the trendline (True if the equation for the trendline is displayed on the chart, in the same data label as the R-squared value). Setting this property to True automatically turns on data labels.
DisplayRSquared	Gets or sets whether to display the R-squared value (True if the R-squared value of the trendline is displayed on the chart, in the same data label as the equation). Setting this property to True automatically turns on data labels.
Format	Returns the format for chart elements.
Forward	Gets or sets the number of periods (or units on a scatter chart) that the trendline extends forward.
Index	Returns 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.
Name	Returns or sets a String value representing the name of the object.
NameIsAuto	Get or set if the trendline's name is automatically determined.
Order	Gets or sets the trendline order (an integer is greater than or equal to 2 and less than or equal to 6) when the trendline type is Polynomial.
Parent	Returns the parent object for the specified object.
Period	Gets or sets the period for the moving-average trendline.
Type	Gets or sets the trendline type.

Name	Description
ClearFormats()	Clears the formatting of the object.
Delete()	Deletes the object.