LineSeriesView.EmptyPointOptions Property

Returns options related to empty points of the line series.

Namespace: DevExpress.XtraCharts

Assembly: DevExpress.XtraCharts.v24.2.dll

Declaration

C#

[PersistenceMode(PersistenceMode.InnerProperty)]
[XtraChartsLocalizableCategory(XtraChartsCategory.Behavior)]
public LineEmptyPointOptions EmptyPointOptions { get; }

VB.NET

<XtraChartsLocalizableCategory(XtraChartsCategory.Behavior)>
<PersistenceMode(PersistenceMode.InnerProperty)>
Public ReadOnly Property EmptyPointOptions As LineEmptyPointOptions

Property Value

Type	Description
LineEmptyPointOptions	Contains settings for empty points of a line series.

Remarks

Use the EmptyPointOptions property to access the following empty point settings:

• Color – Use it to specify the color of line series view point markers.
• ProcessPoints – Allows you define how to handle empty points (for example, the control can automatically populate empty points with zero values).
• LineStyle – Specifies line drawing options.

Refer to the following help topic for more information: Empty Points.

Example

How to: Display Line Chart Empty Points

This example shows how to customize display options for empty points of a line series view.

Cast the EmptyPointOptions property to the LineEmptyPointOptions type to access a line series’ empty point settings.

Specify the ProcessPoints property to define how the chart handles empty points. In this example, the chart calculates mock values for empty points.

C#

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

namespace EmptyPointRepsentation {
    public partial class Form1 : Form {
        ChartControl chart { get { return chartControl1; } }
        public Form1() {
            InitializeComponent();

            chart.DataSource = WeatherDataProvider.Data;
            Series series = new Series("Wind", ViewType.Line);
            series.SetDataMembers("Date", "Wind");
            chart.Series.Add(series);

            LineSeriesView view = (LineSeriesView)series.View;
            view.MarkerVisibility = DevExpress.Utils.DefaultBoolean.True;
            LineEmptyPointOptions lineEmptyPointOptions = view.EmptyPointOptions;
            lineEmptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate;
            lineEmptyPointOptions.Color = Color.DarkGray;
            lineEmptyPointOptions.LineStyle.DashStyle = DashStyle.Dash;
            lineEmptyPointOptions.LineStyle.Thickness = 2;

        }
    }

    public static class WeatherDataProvider {
        static List<WeatherPoint> data;

        public static List<WeatherPoint> Data {
            get {
                if (data == null)
                    InitCollection();
                return data;
            }
        }
        static void InitCollection() {
            data = new List<WeatherPoint>();
            int lastYear = DateTime.Now.Year - 1;
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 10) });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 11), Wind = 5 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 12), Wind = 5 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 13), Wind = 6 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 14), Wind = 3 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 15) });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 16), Wind = 6 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 17), Wind = 5 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 18), Wind = 5 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 19), Wind = 4 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 20), Wind = 3 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 21), Wind = 7 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 22), Wind = 2 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 23) });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 24) });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 25), Wind = 4 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 26), Wind = 5 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 27), Wind = 4 });
            data.Add(new WeatherPoint() { Date = new DateTime(lastYear, 7, 28), Wind = 4 });
        }

        public class WeatherPoint {
            public DateTime Date { get; set; }
            public double? Wind { get; set; }
        }
    }
}

VB.NET

Imports DevExpress.XtraCharts
Imports System
Imports System.Collections.Generic
Imports System.Drawing
Imports System.Windows.Forms
Namespace EmptyPointRepsentation
    Public Partial Class Form1
        Inherits Form
        Private ReadOnly Property chart As ChartControl
            Get
                Return chartControl1
            End Get
        End Property
        Public Sub New()
            InitializeComponent()
            chart.DataSource = Data
            Dim series As Series = New Series("Wind", ViewType.Line)
            series.SetDataMembers("Date", "Wind")
            chart.Series.Add(series)
            Dim view As LineSeriesView = CType(series.View, LineSeriesView)
            view.MarkerVisibility = DevExpress.Utils.DefaultBoolean.[True]
            Dim lineEmptyPointOptions As LineEmptyPointOptions = view.EmptyPointOptions
            lineEmptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate
            lineEmptyPointOptions.Color = Color.DarkGray
            lineEmptyPointOptions.LineStyle.DashStyle = DashStyle.Dash
            lineEmptyPointOptions.LineStyle.Thickness = 2
        End Sub
    End Class

    Public Module WeatherDataProvider
        Private dataField As List(Of WeatherPoint)

        Public ReadOnly Property Data As List(Of WeatherPoint)
            Get
                If dataField Is Nothing Then Call InitCollection()
                Return dataField
            End Get
        End Property

        Private Sub InitCollection()
            dataField = New List(Of WeatherPoint)()
            Dim lastYear As Integer = Date.Now.Year - 1
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 10)
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 11),
                .Wind = 5
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 12),
                .Wind = 5
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 13),
                .Wind = 6
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 14),
                .Wind = 3
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 15)
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 16),
                .Wind = 6
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 17),
                .Wind = 5
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 18),
                .Wind = 5
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 19),
                .Wind = 4
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 20),
                .Wind = 3
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 21),
                .Wind = 7
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 22),
                .Wind = 2
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 23)
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 24)
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 25),
                .Wind = 4
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 26),
                .Wind = 5
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 27),
                .Wind = 4
            })
            Call dataField.Add(New WeatherPoint() With {
                .[Date] = New DateTime(lastYear, 7, 28),
                .Wind = 4
            })
        End Sub

        Public Class WeatherPoint
            Public Property [Date] As Date
            Public Property Wind As Double?
        End Class
    End Module
End Namespace