SeriesPointFilter.Key Property

Gets or sets the key which is compared to the SeriesPointFilter.Value to filter a series point.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v23.2.dll

NuGet Package: DevExpress.Charts

Declaration

C#

public SeriesPointKey Key { get; set; }

VB.NET

Public Property Key As SeriesPointKey

Property Value

Type	Description
SeriesPointKey	A SeriesPointKey enumeration value, specifying the coordinate of a series point by which filtering is performed.

Available values:

Name	Description
Argument	Specifies that sorting is performed by the argument values of a series’ data points.
Value_1	Specifies that series points are sorted based on the first data value within the SeriesPoint.Values array of a series’s data points. For financial data, Value_1 indicates the Low value. For BoxPlot series, it indicates the Min value.
Value_2	Specifies that series points are sorted based on the second data value within the SeriesPoint.Values array of a series’s data points. For financial data, Value_2 indicates the High value. For BoxPlot series, it indicates the Quartile1 value.
Value_3	Specifies that series points are sorted based on the third data value within the SeriesPoint.Values array of a series’s data points. For financial data, Value_3 indicates the Open value. For BoxPlot series, it indicates the Median value.
Value_4	Specifies that series points are sorted based on the fourth data value within the SeriesPoint.Values array of a series’s data points. For financial data, Value_4 indicates the Close value. For BoxPlot series, it indicates the Quartile3 value.
Value_5	Specifies that series points are sorted based on the fifth data value within the SeriesPoint.Values array of a series’s data points. For BoxPlot series, it indicates the Max value.
Value_6	Specifies that series points are sorted based on the sixth data value within the SeriesPoint.Values array of a series’s data points. For BoxPlot series, it indicates the Mean value.

Remarks

Use the Key property to select the points for displaying as exploded slices in the Pie and Donut Series Views.

Example

The following example shows how to create a Pie chart at runtime.

View Example

The Chart Control uses the Simple Diagram to display pies. Cast the ChartControl.Diagram property to the SimpleDiagram type to access diagram settings. The Chart Control determines the diagram type based on the series that is added first. We recommend that you access the diagram to configure its settings after at least one series is added to the chart.

To access pie series view settings, cast the SeriesBase.View property to the PieSeriesView type.

Form1.cs

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

namespace Series_PieChart {
    public partial class Form1 : DevExpress.XtraEditors.XtraForm {
        public Form1() {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e) {
            // Create an empty chart.
            ChartControl pieChart = new ChartControl();

            pieChart.Titles.Add(new ChartTitle() { Text = "Land Area by Country" });

            // Create a pie series.
            Series series1 = new Series("Land Area by Country", ViewType.Pie);

            // Bind the series to data.
            series1.DataSource = DataPoint.GetDataPoints();
            series1.ArgumentDataMember = "Argument";
            series1.ValueDataMembers.AddRange(new string[] { "Value" });

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

            // Access diagram settings.
            SimpleDiagram diagram = (SimpleDiagram)pieChart.Diagram;
            diagram.Margins.All = 10;

            // Format the the series labels.
            series1.Label.TextPattern = "{VP:p0} ({V:.##}M km²)";

            // Format the series legend items.
            series1.LegendTextPattern = "{A}";

            // Adjust the position of series labels. 
            ((PieSeriesLabel)series1.Label).Position = PieSeriesLabelPosition.TwoColumns;

            // Detect overlapping of series labels.
            ((PieSeriesLabel)series1.Label).ResolveOverlappingMode = ResolveOverlappingMode.Default;

            // Access the view-type-specific options of the series.
            PieSeriesView myView = (PieSeriesView)series1.View;

            // Specify the pie rotation.
            myView.Rotation = -60;

            // Specify a data filter to explode points.
            myView.ExplodedPointsFilters.Add(new SeriesPointFilter(SeriesPointKey.Value_1,
                DataFilterCondition.GreaterThanOrEqual, 9));
            myView.ExplodedPointsFilters.Add(new SeriesPointFilter(SeriesPointKey.Argument,
                DataFilterCondition.NotEqual, "Others"));
            myView.ExplodeMode = PieExplodeMode.UseFilters;
            myView.ExplodedDistancePercentage = 30;
            myView.RuntimeExploding = true;

            // Customize the legend.
            pieChart.Legend.Visibility = DevExpress.Utils.DefaultBoolean.True;

            // Add the chart to the form.
            pieChart.Dock = DockStyle.Fill;
            this.Controls.Add(pieChart);
        }
    }
    public class DataPoint {
        public string Argument { get; set; }
        public double Value { get; set; }

        public static List<DataPoint> GetDataPoints() {
            return new List<DataPoint> {
                    new DataPoint { Argument = "Russia",    Value = 17.0752},
                    new DataPoint { Argument = "Canada",    Value = 9.98467},
                    new DataPoint { Argument = "USA",       Value = 9.63142},
                    new DataPoint { Argument = "China",     Value = 9.59696},
                    new DataPoint { Argument = "Brazil",    Value = 8.511965},
                    new DataPoint { Argument = "Australia", Value = 7.68685},
                    new DataPoint { Argument = "India",     Value = 3.28759},
                    new DataPoint { Argument = "Others",    Value = 81.2}
                };
        }
    }
}

Form1.vb

Imports System
Imports System.Collections.Generic
Imports System.Windows.Forms
Imports DevExpress.XtraCharts

Namespace Series_PieChart
    Partial Public Class Form1
        Inherits DevExpress.XtraEditors.XtraForm

        Public Sub New()
            InitializeComponent()
        End Sub
        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
            ' Create an empty chart.
            Dim pieChart As New ChartControl()

            pieChart.Titles.Add(New ChartTitle() With {.Text = "Land Area by Country"})

            ' Create a pie series.
            Dim series1 As New Series("Land Area by Country", ViewType.Pie)

            ' Bind the series to data.
            series1.DataSource = DataPoint.GetDataPoints()
            series1.ArgumentDataMember = "Argument"
            series1.ValueDataMembers.AddRange(New String() { "Value" })

            ' Add the series to the chart.
            pieChart.Series.Add(series1)

            ' Access diagram settings.
            Dim diagram As SimpleDiagram = CType(pieChart.Diagram, SimpleDiagram)
            diagram.Margins.All = 10

            ' Format the the series labels.
            series1.Label.TextPattern = "{VP:p0} ({V:.##}M km²)"

            ' Format the series legend items.
            series1.LegendTextPattern = "{A}"

            ' Adjust the position of series labels. 
            CType(series1.Label, PieSeriesLabel).Position = PieSeriesLabelPosition.TwoColumns

            ' Detect overlapping of series labels.
            CType(series1.Label, PieSeriesLabel).ResolveOverlappingMode = ResolveOverlappingMode.Default

            ' Access the view-type-specific options of the series.
            Dim myView As PieSeriesView = CType(series1.View, PieSeriesView)

            ' Specify a data filter to explode points.
            myView.ExplodedPointsFilters.Add(New SeriesPointFilter(SeriesPointKey.Value_1, DataFilterCondition.GreaterThanOrEqual, 9))
            myView.ExplodedPointsFilters.Add(New SeriesPointFilter(SeriesPointKey.Argument, DataFilterCondition.NotEqual, "Others"))
            myView.ExplodeMode = PieExplodeMode.UseFilters
            myView.ExplodedDistancePercentage = 30
            myView.RuntimeExploding = True

            ' Specify the pie rotation.
            myView.Rotation = -60

            ' Customize the legend.
            pieChart.Legend.Visibility = DevExpress.Utils.DefaultBoolean.True

            ' Add the chart to the form.
            pieChart.Dock = DockStyle.Fill
            Me.Controls.Add(pieChart)
        End Sub
    End Class
    Public Class DataPoint
        Public Property Argument() As String
        Public Property Value() As Double

        Public Shared Function GetDataPoints() As List(Of DataPoint)
            Return New List(Of DataPoint) From {
                New DataPoint With {
                    .Argument = "Russia",
                    .Value = 17.0752
                },
                New DataPoint With {
                    .Argument = "Canada",
                    .Value = 9.98467
                },
                New DataPoint With {
                    .Argument = "USA",
                    .Value = 9.63142
                },
                New DataPoint With {
                    .Argument = "China",
                    .Value = 9.59696
                },
                New DataPoint With {
                    .Argument = "Brazil",
                    .Value = 8.511965
                },
                New DataPoint With {
                    .Argument = "Australia",
                    .Value = 7.68685
                },
                New DataPoint With {
                    .Argument = "India",
                    .Value = 3.28759
                },
                New DataPoint With {
                    .Argument = "Others",
                    .Value = 81.2
                }
            }
        End Function
    End Class
End Namespace