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TrendlineLabel Interface

A label displayed on a trendline.

Namespace: DevExpress.Spreadsheet.Charts

Assembly: DevExpress.Spreadsheet.v18.2.Core.dll

Declaration

public interface TrendlineLabel :
    ShapeFormat,
    ShapeFormatBase,
    ShapeTextFormat

The following members accept/return TrendlineLabel objects:

Remarks

To display a trendline label, you have to set the Trendline.DisplayEquation or the Trendline.DisplayRSquare property to true.

The TrendlineLabel object is exposed by the Trendline.Label property.

The code snippet below illustrates how to format and position a trendline label.

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"];

// 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.Outline.SetSolidFill(Color.Red);

// Format the trend label.
TrendlineLabel tlabel = tline.Label;
tlabel.Font.Name = "Tahoma";
tlabel.Font.Italic = true;
tlabel.Fill.SetGradientFill(ShapeGradientType.Linear, Color.Orange, Color.White);
// Position the label in the right quarter of the chart area.
tlabel.Layout.Left.SetPosition(LayoutMode.Edge, 0.75);
See Also