WebChartControl.CustomizePieTotalLabel Event

Occurs when the WebChartControl draws total labels for pie and donut series.

Namespace: DevExpress.XtraCharts.Web

Assembly: DevExpress.XtraCharts.v21.2.Web.dll

NuGet Package: DevExpress.Web.Visualization

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

This example shows how to format the Doughnut series total label text depending on the total value of the pie slice:

C#

using DevExpress.Utils;
using DevExpress.XtraCharts;
using DevExpress.XtraCharts.Web;
using System;
using System.Collections.Generic;

namespace PieChartSample {
    public partial class WebForm1 : System.Web.UI.Page {
        protected void Page_Load(object sender, EventArgs e) {
            WebChartControl chart = new WebChartControl();
            chart.ID = "WebChart";
            chart.RenderFormat = RenderFormat.Svg;
            chart.Height = 400;
            chart.Width = 400;
            this.Controls.Add(chart);

            Series series = new Series("Donut", ViewType.Doughnut);
            series.DataSource = DataPoint.GetDataPoints();
            series.SetDataMembers("Argument", "Value");

            series.LabelsVisibility = DefaultBoolean.False;
            chart.Series.Add(series);

            PieSeriesView seriesView = (PieSeriesView)series.View;
            seriesView.TotalLabel.Visible = true;

            chart.CustomizePieTotalLabel += Chart_CustomizePieTotalLabel;
        }

        private void Chart_CustomizePieTotalLabel(object sender, CustomizePieTotalLabelEventArgs e) {
            if (e.TotalValue > 1000) {
                e.TextColor = System.Drawing.Color.Green;
                e.Text = $"Total value:{Environment.NewLine}{Math.Round(e.TotalValue / 1000, 2)}K";
            }
        }
    }
    public class DataPoint {
        public string Argument { get; set; }
        public double Value { get; set; }
        public static List<DataPoint> GetDataPoints() {
            return new List<DataPoint> {
                    new DataPoint { Argument = "Russia",    Value = 225.12},
                    new DataPoint { Argument = "Canada",    Value = 148.456},
                    new DataPoint { Argument = "USA",       Value = 211.78},
                    new DataPoint { Argument = "China",     Value = 322.123},
                    new DataPoint { Argument = "Brazil",    Value = 99.511965},
                    new DataPoint { Argument = "Australia", Value = 183.68685},
                    new DataPoint { Argument = "India",     Value = 169.28759}
                };
        }
    }
}

VB.NET

Imports DevExpress.Utils
Imports DevExpress.XtraCharts
Imports DevExpress.XtraCharts.Web
Imports System
Imports System.Collections.Generic

Namespace PieChartSample
    Public Partial Class WebForm1
        Inherits Web.UI.Page
        Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
            Dim chart As WebChartControl = New WebChartControl()
            chart.ID = "WebChart"
            chart.RenderFormat = RenderFormat.Svg
            chart.Height = 400
            chart.Width = 400
            Me.Controls.Add(chart)

            Dim series As Series = New Series("Donut", ViewType.Doughnut)
            series.DataSource = DataPoint.GetDataPoints()
            series.SetDataMembers("Argument", "Value")

            series.LabelsVisibility = DefaultBoolean.[False]
            chart.Series.Add(series)

            Dim seriesView As PieSeriesView = CType(series.View, PieSeriesView)
            seriesView.TotalLabel.Visible = True

            chart.CustomizePieTotalLabel += AddressOf Chart_CustomizePieTotalLabel
        End Sub

        Private Sub Chart_CustomizePieTotalLabel(ByVal sender As Object, ByVal e As CustomizePieTotalLabelEventArgs)
            If e.TotalValue > 1000 Then
                e.TextColor = Drawing.Color.Green
                e.Text = $"Total value:{Environment.NewLine}{Math.Round(e.TotalValue / 1000, 2)}K"
            End If
        End Sub
    End Class
    Public Class DataPoint
        Public Property Argument As String
        Public Property Value As Double
        Public Shared Function GetDataPoints() As List(Of DataPoint)
            Return New List(Of DataPoint) From {
                    New DataPoint With {
                    .Argument = "Russia",
                    .Value = 225.12
                },
                    New DataPoint With {
                    .Argument = "Canada",
                    .Value = 148.456
                },
                    New DataPoint With {
                    .Argument = "USA",
                    .Value = 211.78
                },
                    New DataPoint With {
                    .Argument = "China",
                    .Value = 322.123
                },
                    New DataPoint With {
                    .Argument = "Brazil",
                    .Value = 99.511965
                },
                    New DataPoint With {
                    .Argument = "Australia",
                    .Value = 183.68685
                },
                    New DataPoint With {
                    .Argument = "India",
                    .Value = 169.28759
                }
                }
        End Function
    End Class
End Namespace