corelibraries-devexpress-dot-xtracharts-6f2e5882.md
Contains options related to empty points.
Namespace : DevExpress.XtraCharts
Assembly : DevExpress.XtraCharts.v25.2.dll
NuGet Package : DevExpress.Charts
public class EmptyPointOptions :
ChartElement,
IEmptyPointColorizer
Public Class EmptyPointOptions
Inherits ChartElement
Implements IEmptyPointColorizer
The following members return EmptyPointOptions objects:
The EmptyPointOptions class contains 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 a bar series view.
Cast the XYDiagramSeriesViewBase.EmptyPointOptions property to the EmptyPointOptions type to access a 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.Bar);
series.SetDataMembers("Date", "Wind");
chart.Series.Add(series);
BarSeriesView view = (BarSeriesView)series.View;
EmptyPointOptions emptyPointOptions = view.EmptyPointOptions;
emptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate;
emptyPointOptions.Color = Color.FromArgb(100, Color.DarkGray);
}
}
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.Bar)
series.SetDataMembers("Date", "Wind")
chart.Series.Add(series)
Dim view As BarSeriesView = CType(series.View, BarSeriesView)
Dim emptyPointOptions As EmptyPointOptions = view.EmptyPointOptions
emptyPointOptions.ProcessPoints = ProcessEmptyPointsMode.Interpolate
emptyPointOptions.Color = Color.FromArgb(100, Color.DarkGray)
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