corelibraries-devexpress-dot-xtracharts-ff25fc51.md
Contains empty point options for area series views and their descendants.
Namespace : DevExpress.XtraCharts
Assembly : DevExpress.XtraCharts.v25.2.dll
NuGet Package : DevExpress.Charts
public class AreaEmptyPointOptions :
EmptyPointOptions
Public Class AreaEmptyPointOptions
Inherits EmptyPointOptions
The following members return AreaEmptyPointOptions objects:
The AreaEmptyPointOptions class introduces the following options:
Refer to the following help topic for more information: Empty Points.
This example shows how to customize display options for empty points of an area series view.
Cast the AreaSeriesViewBase.EmptyPointOptions property to the AreaEmptyPointOptions type to access an area 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.Area);
series.SetDataMembers("Date", "Wind");
chart.Series.Add(series);
AreaSeriesView view = (AreaSeriesView)series.View;
view.MarkerVisibility = DevExpress.Utils.DefaultBoolean.True;
AreaEmptyPointOptions areaEmptyPointOptions = view.EmptyPointOptions;
areaEmptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate;
areaEmptyPointOptions.FillStyle.FillMode = FillMode.Solid;
areaEmptyPointOptions.Color = Color.DarkGray;
areaEmptyPointOptions.Border.Color = Color.Gray;
areaEmptyPointOptions.Border.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.Area)
series.SetDataMembers("Date", "Wind")
chart.Series.Add(series)
Dim view As AreaSeriesView = CType(series.View, AreaSeriesView)
view.MarkerVisibility = DevExpress.Utils.DefaultBoolean.[True]
Dim areaEmptyPointOptions As AreaEmptyPointOptions = view.EmptyPointOptions
areaEmptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate
areaEmptyPointOptions.FillStyle.FillMode = FillMode.Solid
areaEmptyPointOptions.Color = Color.DarkGray
areaEmptyPointOptions.Border.Color = Color.Gray
areaEmptyPointOptions.Border.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 AreaEmptyPointOptions
See Also