corelibraries-devexpress-dot-xtracharts-5d035451.md
Contains empty point options for line series views and their descendants.
Namespace : DevExpress.XtraCharts
Assembly : DevExpress.XtraCharts.v25.2.dll
NuGet Package : DevExpress.Charts
public class LineEmptyPointOptions :
EmptyPointOptions
Public Class LineEmptyPointOptions
Inherits EmptyPointOptions
The following members return LineEmptyPointOptions objects:
The LineEmptyPointOptions class contains the LineStyle property that specifies line drawing options. These options are used to draw line segments that contain empty points.
Refer to the following help topic for more information: 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.
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; }
}
}
}
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
Object ChartElement EmptyPointOptions LineEmptyPointOptions
See Also