TrendlineCollection.Add(ChartTrendlineType) Method
Creates a new trendline of the specified type and adds it to the collection.
Namespace: DevExpress.Spreadsheet.Charts
Assembly: DevExpress.Spreadsheet.v24.1.Core.dll
NuGet Package: DevExpress.Spreadsheet.Core
Declaration
Parameters
| Name | Type | Description |
|---|---|---|
| trendlineType | ChartTrendlineType | A ChartTrendlineType enumeration member that specifies the trendline type. |
Returns
| Type | Description |
|---|---|
| Trendline | A Trendline object that is the newly added element in the collection. |
Example
The following code uses the TrendlineCollection.Add method to display a trendline of the ChartTrendlineType.Polynomial type and customize it.
Worksheet worksheet = workbook.Worksheets["chartTask3"];
workbook.Worksheets.ActiveWorksheet = worksheet;
// Create a chart and specify its location.
Chart chart = worksheet.Charts.Add(ChartType.ScatterMarkers);
chart.SelectData(worksheet["C2:F3"], ChartDataDirection.Row);
chart.TopLeftCell = worksheet.Cells["H2"];
chart.BottomRightCell = worksheet.Cells["N14"];
// Set the minimum and maximum values for the chart value axis.
Axis axis = chart.PrimaryAxes[1];
axis.Scaling.AutoMax = false;
axis.Scaling.AutoMin = false;
axis.Scaling.Min = 0.6;
axis.Scaling.Max = 1.0;
chart.PrimaryAxes[1].MajorGridlines.Visible = false;
// Display a polynomial trendline.
chart.Series[0].Trendlines.Add(ChartTrendlineType.Polynomial);
// Customize the trendline.
Trendline tline = chart.Series[0].Trendlines[0];
tline.DisplayEquation = true;
tline.CustomName = "Trend";
tline.DisplayRSquare = true;
tline.Backward = 1;
tline.Forward = 2;
tline.Outline.SetSolidFill(Color.Red);
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the Add(ChartTrendlineType) method.
Note
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