CrosshairOptions.GroupHeaderPattern Property

Gets or sets a pattern that specifies the group header text to be displayed within the crosshair label.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v21.2.dll

Declaration

public string GroupHeaderPattern { get; set; }

Property Value

Type Description
String

The group header’s pattern.

Property Paths

You can access this nested property as listed below:

Library Object Type Path to GroupHeaderPattern
WinForms Controls ChartControl
.CrosshairOptions.GroupHeaderPattern
ASP.NET MVC Extensions ChartControlSettings
.CrosshairOptions.GroupHeaderPattern
MVCxChartControl
.CrosshairOptions.GroupHeaderPattern
ASP.NET Web Forms Controls WebChartControl
.CrosshairOptions.GroupHeaderPattern

Remarks

GroupHeaderPattern can contain plain text and placeholders with format specifiers. The following placeholders are available:

Placeholder Description
{A} Displays an argument. CrosshairOptions.SnapMode should be set to NearestArgument.
{V} Displays a value. CrosshairOptions.SnapMode should be set to NearestValue.

The following image shows this property in action with the “Year: {A}” pattern.

GroupHeadersPattern

You can use the Pattern Editor to specify the pattern. Click the GroupHeaderPattern property’s ellipsis button in the Properties window to invoke the editor.

Note

A crosshair group header is not displayed on the crosshair label when the CrosshairOptions.CrosshairLabelMode property is set either to CrosshairLabelMode.ShowForEachSeries or CrosshairLabelMode.ShowForNearestSeries modes and when the crosshair is only allowed for a single series. Specify GroupHeaderPattern to make the Crosshair Cursor always show group headers.

See the Crosshair Cursor topic for more information.

Example

This example demonstrates how to change a text displayed in crosshair labels using crosshair format patterns.

To accomplish this, it is necessary to specify a string which will represent the pattern displayed within a crosshair label using the CrosshairAxisLabelOptions.Pattern, SeriesBase.CrosshairLabelPattern, and CrosshairOptions.GroupHeaderPattern properties.

In addition, standard and custom format specifiers are used together with the placeholders to format numeric and date/time values (e.g., “{A:F0}”). To learn more, see the Format Specifiers topic.

To learn more on crosshair cursors, see the Tooltip and Crosshair Cursor topic.

using System;
using System.Windows.Forms;
using DevExpress.XtraCharts;

namespace FormatCrosshairLabels
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            this.Load += new System.EventHandler(this.Form1_Load);
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            // Create an empty chart.
            ChartControl chartControl1 = new ChartControl();

            // Create a first line series and add points to it.
            Series series1 = new Series("Europe", ViewType.Line);
            series1.Points.Add(new SeriesPoint(1950, 546));
            series1.Points.Add(new SeriesPoint(1960, 605));
            series1.Points.Add(new SeriesPoint(1970, 656));
            series1.Points.Add(new SeriesPoint(1980, 694));
            series1.Points.Add(new SeriesPoint(1990, 721));
            series1.Points.Add(new SeriesPoint(2000, 730));
            series1.Points.Add(new SeriesPoint(2010, 728));

            // Create a second line series and add points to it.
            Series series2 = new Series("Americas", ViewType.Line);
            series2.Points.Add(new SeriesPoint(1950, 332));
            series2.Points.Add(new SeriesPoint(1960, 417));
            series2.Points.Add(new SeriesPoint(1970, 513));
            series2.Points.Add(new SeriesPoint(1980, 614));
            series2.Points.Add(new SeriesPoint(1990, 721));
            series2.Points.Add(new SeriesPoint(2000, 836));
            series2.Points.Add(new SeriesPoint(2010, 935));

            // Add the series to the chart.
            chartControl1.Series.Add(series1);
            chartControl1.Series.Add(series2);

            // Hide the legend (if necessary).
            chartControl1.Legend.Visible = false;

            //Show crosshair axis lines and crosshair axis labels to see format values of crosshair labels 
            chartControl1.CrosshairOptions.ShowArgumentLabels = true;
            chartControl1.CrosshairOptions.ShowValueLabels = true;
            chartControl1.CrosshairOptions.ShowValueLine = true;
            chartControl1.CrosshairOptions.ShowArgumentLine = true;

            // Specify the crosshair label pattern for both series.
            series1.CrosshairLabelPattern = "{S} population: {V}";
            series2.CrosshairLabelPattern = "{S} population: {V}";

            // Specify the crosshair group header pattern.
            chartControl1.CrosshairOptions.GroupHeaderPattern = "Year: {A}";

            // Cast the chart's diagram to the XYDiagram type, to access its axes.
            XYDiagram diagram = (XYDiagram)chartControl1.Diagram;

            // Specify the crosshair axis labels pattern for X-axis.
            diagram.AxisX.CrosshairAxisLabelOptions.Pattern = "Year: {A:F0}";

            // Add the chart to the form.
            chartControl1.Dock = DockStyle.Fill;
            this.Controls.Add(chartControl1);
        }

    }
}
See Also