BubbleMapDashboardItem Class

A Bubble Map dashboard item that allows you to place bubbles on the map using geographical coordinates.

Namespace: DevExpress.DashboardCommon

Assembly: DevExpress.Dashboard.v19.2.Core.dll

Declaration

C#

public class BubbleMapDashboardItem :
    GeoPointMapDashboardItemBase

VB.NET

Public Class BubbleMapDashboardItem
    Inherits GeoPointMapDashboardItemBase

Remarks

The Bubble Map dashboard item allows you to place bubbles on the map using geographical coordinates. Each bubble can represent data via its weight and color.

The following documentation is available.

• WinForms Designer - Creating Geo Point Maps
• Web Dashboard - Creating Geo Point Maps

Example

The following example demonstrates how to bind a Bubble Map dashboard item to data in code and customize the item’s palette.

Note

The complete sample project How to Bind a Bubble Map Dashboard Item to Data at Runtime is available in the DevExpress Examples repository.

Form1.cs

using System;
using System.Collections.Generic;
using DevExpress.DashboardCommon;
using DevExpress.DataAccess.ConnectionParameters;
using DevExpress.DataAccess.Sql;
using DevExpress.XtraEditors;

namespace Dashboard_CreateBubbleMap {
    public partial class Form1 : XtraForm {
        public Form1() {
            InitializeComponent();
            dashboardViewer1.AsyncMode = true;
        }

        private void Form1_Load(object sender, EventArgs e) {
            Dashboard dashboard = new Dashboard();
            DashboardSqlDataSource dataSource = new DashboardSqlDataSource(); 
            dataSource.ConnectionParameters =
                new XmlFileConnectionParameters(@"..\..\Data\DashboardEnergyStatictics.xml");
            SelectQuery sqlQuery = SelectQueryFluentBuilder
                .AddTable("Countries")
                .SelectColumns("Latitude", "Longitude", "Production", "Import", "Country")
                .Build("Countries");

            dataSource.Queries.Add(sqlQuery);
            dashboard.DataSources.Add(dataSource);

            BubbleMapDashboardItem bubbleMap = new BubbleMapDashboardItem();
            bubbleMap.DataSource = dashboard.DataSources[0];
            bubbleMap.DataMember = "Countries";

            bubbleMap.Area = ShapefileArea.Europe;

            bubbleMap.Latitude = new Dimension("Latitude");
            bubbleMap.Longitude = new Dimension("Longitude");

            bubbleMap.Weight = new Measure("Production", SummaryType.Sum);
            bubbleMap.Color = new Measure("Import", SummaryType.Sum); 
            bubbleMap.Color.NumericFormat.FormatType = DataItemNumericFormatType.General;

            bubbleMap.TooltipDimensions.Add(new Dimension("Country"));

            CustomizeScale(bubbleMap);
            ShowLegends(bubbleMap);

            dashboard.Items.Add(bubbleMap);
            dashboardViewer1.Dashboard = dashboard;
        }
        private void CustomizeScale(BubbleMapDashboardItem map) {
            CustomScale customScale = new CustomScale();
            List<double> rangeStops = new List<double>();

            customScale.IsPercent = false;

            rangeStops.Add(20);
            rangeStops.Add(200);
            rangeStops.Add(500);
            rangeStops.Add(2000);
            customScale.RangeStops.AddRange(rangeStops);

            map.ColorScale = customScale;
        }
        private void ShowLegends(BubbleMapDashboardItem map) {
            map.Legend.Visible = true;
            map.Legend.Orientation = MapLegendOrientation.Horizontal;
            map.WeightedLegend.Visible = true;
            map.WeightedLegend.Position = MapLegendPosition.BottomLeft;
        }
    }
}

Form1.vb

Imports System
Imports System.Collections.Generic
Imports DevExpress.DashboardCommon
Imports DevExpress.DataAccess.ConnectionParameters
Imports DevExpress.DataAccess.Sql
Imports DevExpress.XtraEditors

Namespace Dashboard_CreateBubbleMap
    Partial Public Class Form1
        Inherits XtraForm

        Public Sub New()
            InitializeComponent()
        End Sub

        Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles Me.Load
            Dim dashboard As New Dashboard()
            Dim dataSource As New DashboardSqlDataSource()
            dataSource.ConnectionParameters = New XmlFileConnectionParameters("..\..\Data\DashboardEnergyStatictics.xml")
            Dim sqlQuery As SelectQuery = SelectQueryFluentBuilder.AddTable("Countries").SelectColumns("Latitude", "Longitude", "Production", "Import", "Country").Build("Countries")

            dataSource.Queries.Add(sqlQuery)
            dashboard.DataSources.Add(dataSource)

            Dim bubbleMap As New BubbleMapDashboardItem()
            bubbleMap.DataSource = dashboard.DataSources(0)
            bubbleMap.DataMember = "Countries"

            bubbleMap.Area = ShapefileArea.Europe

            bubbleMap.Latitude = New Dimension("Latitude")
            bubbleMap.Longitude = New Dimension("Longitude")

            bubbleMap.Weight = New Measure("Production", SummaryType.Sum)
            bubbleMap.Color = New Measure("Import", SummaryType.Sum)
            bubbleMap.Color.NumericFormat.FormatType = DataItemNumericFormatType.General

            bubbleMap.TooltipDimensions.Add(New Dimension("Country"))

            CustomizeScale(bubbleMap)
            ShowLegends(bubbleMap)

            dashboard.Items.Add(bubbleMap)
            dashboardViewer1.Dashboard = dashboard
        End Sub
        Private Sub CustomizeScale(ByVal map As BubbleMapDashboardItem)
            Dim customScale As New CustomScale()
            Dim rangeStops As New List(Of Double)()

            customScale.IsPercent = False

            rangeStops.Add(20)
            rangeStops.Add(200)
            rangeStops.Add(500)
            rangeStops.Add(2000)
            customScale.RangeStops.AddRange(rangeStops)

            map.ColorScale = customScale
        End Sub
        Private Sub ShowLegends(ByVal map As BubbleMapDashboardItem)
            map.Legend.Visible = True
            map.Legend.Orientation = MapLegendOrientation.Horizontal
            map.WeightedLegend.Visible = True
            map.WeightedLegend.Position = MapLegendPosition.BottomLeft
        End Sub
    End Class
End Namespace

Inheritance

Object

DashboardItem

DataDashboardItem

MapDashboardItem

GeoPointMapDashboardItemBase

BubbleMapDashboardItem