ChartCalculatedFieldType Enum

Lists a calculated field’s returned value types.

Namespace: DevExpress.Xpf.Charts

Assembly: DevExpress.Xpf.Charts.v25.1.dll

NuGet Package: DevExpress.Wpf.Charts

Declaration

C#

public enum ChartCalculatedFieldType

VB.NET

Public Enum ChartCalculatedFieldType

Members

Name	Description
None	Indicates that the field’s type is undefined and determined based on the returned object during chart initialization.
String	Indicates that the field returns a string value as a sequence of UTF-16 code units (the String type).
DateTime	Indicates that the field returns a value expressed as a date and time of day (the DateTime type).
TimeSpan	Indicates that the field returns a value as a time interval (the TimeSpan type).
Byte	Indicates that the field returns an 8-bit unsigned integer value (the Byte type).
Int16	Indicates that the field returns a 16-bit signed integer value (the Int16 type).
Int32	Indicates that the field returns a 32-bit signed integer value (the Int32 type).
Float	Indicates that the field returns a single-precision floating-point value (the Single type).
Double	Indicates that the field returns a double-precision floating-point value (the Double type).
Decimal	Indicates that the field returns a decimal value (the Decimal type).
Boolean	Indicates that the field returns a Boolean (true or false) value (the Boolean type).
Guid	Indicates that the field returns a global unique identifier value (the Guid type).

Related API Members

The following properties accept/return ChartCalculatedFieldType values:

• ChartCalculatedField.FieldType

Example

The following example shows how to create a calculated field and then use this field as a data source for a series. The field’s values are calculated by the following expression: [Time.Seconds] * [Velocity].

XAML

<dxc:ChartControl x:Name="chartControl">
    <dxc:ChartControl.DataContext>
        <local:ChartViewModel/>
    </dxc:ChartControl.DataContext>
    <dxc:ChartControl.CalculatedFields>
        <dxc:ChartCalculatedField FieldName="Displacement" 
                                  Expression="[Time.Seconds] * [Velocity]" 
                                  FieldType="Double"/>
    </dxc:ChartControl.CalculatedFields>
    <dxc:XYDiagram2D>
        <dxc:SplineSeries2D DisplayName="Series" 
                            DataSource="{Binding DataPoints}"
                            ArgumentDataMember="Time"
                            ValueDataMember="Displacement" 
                            CrosshairLabelPattern="{}{Displacement:f1}" 
                            MarkerVisible="True"/>
        ...
    </dxc:XYDiagram2D>
</dxc:ChartControl>

C#

using System;
using System.Collections.Generic;
using System.Windows;

namespace CalculatedFields {
    public class ChartViewModel {
        List<DataPoint> dataPoints;
        public List<DataPoint> DataPoints {
            get {
                if (dataPoints == null) {
                    dataPoints = new List<DataPoint> {
                            new DataPoint (new TimeSpan(0, 0, 0), 10),
                            new DataPoint (new TimeSpan(0, 0, 1), 11.46),
                            new DataPoint (new TimeSpan(0, 0, 2), 11.90),
                            new DataPoint (new TimeSpan(0, 0, 3), 12.1),
                            new DataPoint (new TimeSpan(0, 0, 4), 12.236),
                            new DataPoint (new TimeSpan(0, 0, 5), 12.325),
                            new DataPoint (new TimeSpan(0, 0, 6), 12.625),
                            new DataPoint (new TimeSpan(0, 0, 7), 13.896),
                            new DataPoint (new TimeSpan(0, 0, 8), 14.123),
                            new DataPoint (new TimeSpan(0, 0, 9), 14.623),
                            new DataPoint (new TimeSpan(0, 0, 10), 15.007),
                            new DataPoint (new TimeSpan(0, 0, 11), 15.452),
                            new DataPoint (new TimeSpan(0, 0, 12), 15.756)
                };
                }
                return dataPoints;
            }
        }
    }
    public class DataPoint {
        public TimeSpan Time { get; set; }
        public double Velocity { get; set; }
        public DataPoint(TimeSpan time, double velocity) {
            this.Time = time;
            this.Velocity = velocity;
        }
    }
}

VB.NET

Imports System
Imports System.Collections.Generic
Imports System.Windows

Namespace CalculatedFields
    Public Class ChartViewModel
        Private f_DataPoints As List(Of DataPoint)
        Public ReadOnly Property DataPoints As List(Of DataPoint)
            Get
                If f_DataPoints Is Nothing Then
                    f_DataPoints = New List(Of DataPoint) From {
                        New DataPoint(New TimeSpan(0, 0, 0), 10),
                        New DataPoint(New TimeSpan(0, 0, 1), 11.46),
                        New DataPoint(New TimeSpan(0, 0, 2), 11.90),
                        New DataPoint(New TimeSpan(0, 0, 3), 12.1),
                        New DataPoint(New TimeSpan(0, 0, 4), 12.236),
                        New DataPoint(New TimeSpan(0, 0, 5), 12.325),
                        New DataPoint(New TimeSpan(0, 0, 6), 12.625),
                        New DataPoint(New TimeSpan(0, 0, 7), 13.896),
                        New DataPoint(New TimeSpan(0, 0, 8), 14.123),
                        New DataPoint(New TimeSpan(0, 0, 9), 14.623),
                        New DataPoint(New TimeSpan(0, 0, 10), 15.007),
                        New DataPoint(New TimeSpan(0, 0, 11), 15.452),
                        New DataPoint(New TimeSpan(0, 0, 12), 15.756)
                    }
                End If
                Return f_DataPoints
            End Get
        End Property
    End Class
    Public Class DataPoint
        Public Property Time As TimeSpan
        Public Property Velocity As Double
        Public Sub New(ByVal time As TimeSpan, ByVal velocity As Double)
            Me.Time = time
            Me.Velocity = velocity
        End Sub
    End Class
End Namespace