This example demonstrates how to use the manual date-time scale options of the X-axis.
Data aggregation is enabled automatically for the date-time scale on the X-axis in both automatic and manual scale options.
When the AxisX2D.DateTimeScaleOptions property is set to ManualDateTimeScaleOptions, you can define the ManualDateTimeScaleOptions.GridAlignment, ManualDateTimeScaleOptions.MeasureUnit and ManualDateTimeScaleOptions.AggregateFunction properties manually.
To use the automatic date-time scale options, set the AxisX2D.DateTimeScaleOptions property to AutomaticDateTimeScaleOptions, and select the appropriate AutomaticDateTimeScaleOptions.AggregateFunction.
To prevent the axis scale from being divided into intervals (and thus prevent chart data from being aggregated), set the ManualDateTimeScaleOptions.AggregateFunction property to None.
View Example
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:dxc="http://schemas.devexpress.com/winfx/2008/xaml/charts"
x:Class="WpfApplication19.MainWindow"
Title="MainWindow" Height="400" Width="525">
<Grid>
<dxc:ChartControl>
<dxc:XYDiagram2D >
<dxc:XYDiagram2D.AxisX>
<dxc:AxisX2D GridLinesMinorVisible="True" GridLinesVisible="True">
<dxc:AxisX2D.DateTimeScaleOptions>
<dxc:ManualDateTimeScaleOptions AggregateFunction="Maximum" AutoGrid="False"
GridAlignment="Year" MeasureUnit="Month"
GridSpacing="3" GridOffset="1"/>
</dxc:AxisX2D.DateTimeScaleOptions>
</dxc:AxisX2D>
</dxc:XYDiagram2D.AxisX>
<dxc:LineSeries2D DataSource="{Binding Path=Rate}"
ArgumentDataMember="Argument" ValueDataMember="Value" />
</dxc:XYDiagram2D>
</dxc:ChartControl>
</Grid>
</Window>
Imports Microsoft.VisualBasic
Imports System
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Windows
Imports System.Windows.Resources
Imports System.Xml.Linq
Namespace WpfApplication19
Partial Public Class MainWindow
Inherits Window
Public Sub New()
InitializeComponent()
DataContext = New MyModel()
End Sub
End Class
Public Class DateTimePoint
Private value_Renamed As Double
Private argument_Renamed As DateTime
Public ReadOnly Property Value() As Double
Get
Return value_Renamed
End Get
End Property
Public ReadOnly Property Argument() As DateTime
Get
Return argument_Renamed
End Get
End Property
Public Sub New(ByVal argument As DateTime, ByVal value As Double)
Me.argument_Renamed = argument
Me.value_Renamed = value
End Sub
End Class
Public Class MyModel
Private rate_Renamed As New List(Of DateTimePoint)()
Public ReadOnly Property Rate() As List(Of DateTimePoint)
Get
Return rate_Renamed
End Get
End Property
Public Sub New()
LoadPoints(rate_Renamed, LoadFromFile("/GbpUsdRate.xml"))
End Sub
Private Function LoadFromFile(ByVal xmlFile As String) As XDocument
Return LoadXmlFromResources(xmlFile)
End Function
Public Shared Function LoadXmlFromResources(ByVal fileName As String) As XDocument
Try
fileName = "/WpfApplication19;component" & fileName
Dim uri As New Uri(fileName, UriKind.RelativeOrAbsolute)
Dim info As StreamResourceInfo = Application.GetResourceStream(uri)
Return XDocument.Load(info.Stream)
Catch
Return Nothing
End Try
End Function
Private Sub LoadPoints(ByVal rate As List(Of DateTimePoint), ByVal document As XDocument)
If rate IsNot Nothing AndAlso document IsNot Nothing Then
For Each element As XElement In document.Descendants("CurrencyRate")
Dim argument As DateTime = DateTime.Parse(element.Element("DateTime").Value)
Dim value As Double = Double.Parse(element.Element("Rate").Value, CultureInfo.InvariantCulture)
rate.Add(New DateTimePoint(argument, value))
Next element
End If
End Sub
End Class
End Namespace
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Windows;
using System.Windows.Resources;
using System.Xml.Linq;
namespace WpfApplication19
{
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
DataContext = new MyModel();
}
}
public class DateTimePoint
{
double value;
DateTime argument;
public double Value
{
get { return value; }
}
public DateTime Argument
{
get { return argument; }
}
public DateTimePoint(DateTime argument, double value)
{
this.argument = argument;
this.value = value;
}
}
public class MyModel
{
List<DateTimePoint> rate = new List<DateTimePoint>();
public List<DateTimePoint> Rate
{
get { return rate; }
}
public MyModel()
{
LoadPoints(rate, LoadFromFile("/GbpUsdRate.xml"));
}
XDocument LoadFromFile(string xmlFile)
{
return LoadXmlFromResources(xmlFile);
}
public static XDocument LoadXmlFromResources(string fileName)
{
try
{
fileName = "/WpfApplication19;component" + fileName;
Uri uri = new Uri(fileName, UriKind.RelativeOrAbsolute);
StreamResourceInfo info = Application.GetResourceStream(uri);
return XDocument.Load(info.Stream);
}
catch
{
return null;
}
}
void LoadPoints(List<DateTimePoint> rate, XDocument document)
{
if (rate != null && document != null)
{
foreach (XElement element in document.Descendants("CurrencyRate"))
{
DateTime argument = DateTime.Parse(element.Element("DateTime").Value);
double value = double.Parse(element.Element("Rate").Value, CultureInfo.InvariantCulture);
rate.Add(new DateTimePoint(argument, value));
}
}
}
}
}