XRChart.CustomizePieTotalLabel Event

Occurs before the pie total label is painted.

Namespace: DevExpress.XtraReports.UI

Assembly: DevExpress.XtraReports.v19.1.dll

NuGet Packages: DevExpress.Reporting.Core, DevExpress.WindowsDesktop.Core

Declaration

C#

public event CustomizePieTotalLabelEventHandler CustomizePieTotalLabel

VB.NET

Public Event CustomizePieTotalLabel As CustomizePieTotalLabelEventHandler

Event Data

The CustomizePieTotalLabel event's data class is CustomizePieTotalLabelEventArgs. The following properties provide information specific to this event:

Property	Description
Series	Returns a pie series whose total label is customized.
Text	Gets or sets the total label text.
TextColor	Gets or sets the total label’s text color.
TotalValue	Returns the total label value.

Remarks

Handle this event to customize the text in the pie total label:

• Use the CustomizePieTotalLabelEventArgs.Series property to access the series to which the painted label belongs.
• Specify the label text in the CustomizePieTotalLabelEventArgs.Text property.
  A label displays the point value (the CustomizePieTotalLabelEventArgs.TotalValue) by default. Changes to the Text property value do not affect the TotalValue.
• Specify the text color in the CustomizePieTotalLabelEventArgs.TextColor property.
• Use the CustomizePieTotalLabelEventArgs.TotalValue property to obtain the point value.
  A label displays this value if you do not change the Text property value.

Tip

You can use this event to conditionally customize the pie chart total label’s text. See the code sample below for details.

Refer to the Total Labels topic for information on total labels.

Example

The code sample below creates a pie chart, shows total labels, and customizes the label text.

C#

using DevExpress.XtraCharts;
using System.IO;
using System.Drawing;
using DevExpress.Data.Filtering;
using DevExpress.XtraPrinting;
// ...
// Create a chart instance.
XRChart chart = new XRChart();
// Create a chart parameter and bind it to the CategoryID field. Prepend the field name with the data member name.
chart.Parameters.Add(new XRControlParameter("ChartCategoryID", null, "Products.CategoryID"));
// Create a chart series that displays products prices.
Series series = new Series("Series1", ViewType.Pie);
series.ArgumentDataMember = "Products.ProductName";
series.ValueDataMembers.AddRange(new string[] { "Products.UnitPrice" });
// Display products from a specific category only.
series.FilterString = "Products.CategoryID = ?ChartCategoryID";
// Add the series to the chart.
chart.Series.Add(series);
// Make the total label visible.
((PieSeriesView)series.View).TotalLabel.Visible = true;
// Add the CustomizePieTotalLabel event handler.
chart.CustomizePieTotalLabel += chart_CustomizePieTotalLabel;
// ...
private void chart_CustomizePieTotalLabel(object sender, CustomizePieTotalLabelEventArgs e) {
    // Apply the currency format to the label text.
    e.Text = string.Format("{0:c2}", e.TotalValue);
    // Set the total label's text color to red on prices greater than or equal to 100.
    if(e.TotalValue>=100)
        e.TextColor = Color.Red;
}

VB.NET

Imports DevExpress.XtraCharts
Imports System.IO
Imports System.Drawing
Imports DevExpress.Data.Filtering
Imports DevExpress.XtraPrinting
' ...
' Create a chart instance.
Private chart As New XRChart()
' Create a chart parameter and bind it to the CategoryID field. Prepend the field name with the data member name.
chart.Parameters.Add(New XRControlParameter("ChartCategoryID", Nothing, "Products.CategoryID"))
' Create a chart series that displays products prices.
Dim series As New Series("Series1", ViewType.Pie)
series.ArgumentDataMember = "Products.ProductName"
series.ValueDataMembers.AddRange(New String() { "Products.UnitPrice" })
' Display products from a specific category only.
series.FilterString = "Products.CategoryID = ?ChartCategoryID"
' Add the series to the chart.
chart.Series.Add(series)
' Make the total label visible.
CType(series.View, PieSeriesView).TotalLabel.Visible = True
' Add the CustomizePieTotalLabel event handler.
AddHandler chart.CustomizePieTotalLabel, AddressOf chart_CustomizePieTotalLabel
' ...
private void chart_CustomizePieTotalLabel(Object sender, CustomizePieTotalLabelEventArgs e)
    ' Apply the currency format to the label text.
    e.Text = String.Format("{0:c2}", e.TotalValue)
    ' Set the total label's text color to red on prices greater than or equal to 100.
    If e.TotalValue>=100 Then
        e.TextColor = Color.Red
    End If