Creating TrendLines at Design Time

TrendLines can be created at design time using the TrendLine Collection Editor. Using the collection editor, you may add, modify and remove trend lines. For more information on the TrendLine Collection Editor, see TrendLine Collection Editor.

Creating TrendLines Programmatically

To create a TrendLine programmatically, create instance of TrendLine object and set its properties. The TrendLine can be created using its constructor or AddNewTrendLine.TrendLinesCollection() method of TrendLinesCollection.

The following code adds a red TrendLine to ChartGroup(0) of the Chart:

To write code in Visual Basic

' create trend line        
Dim tl As C1.Win.C1Chart.TrendLine = New C1.Win.C1Chart.TrendLine()
' first data series       
tl.SeriesIndex = 0       
' set line color and thickness      
tl.LineStyle.Color = Color.Red      
tl.LineStyle.Thickness = 2
' show formula in legend    
tl.Text = "{#FORMULA}"       
' add trend to the chart        
c1Chart1.ChartGroups(0).ChartData.TrendsList.Add(tl)

To write code in C#

// create trend line       
C1.Win.C1Chart.TrendLine tl = new C1.Win.C1Chart.TrendLine();        
// first data series       
tl.SeriesIndex = 0;        
// set line color and thickness       
tl.LineStyle.Color = Color.Red;  
tl.LineStyle.Thickness = 2;     
// show formula in legend    
tl.Text = "{#FORMULA}";     
// add trend to the chart    
c1Chart1.ChartGroups[0].ChartData.TrendsList.Add( tl);

This topic illustrates the following:

The red trend line connects the first and last data points.