MapMultipointItemMappingInfo Class

Contains information about mappings that are used to obtain multipoint item data from a source.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v24.2.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public class MapMultipointItemMappingInfo :
    MapItemMappingInfo

VB.NET

Public Class MapMultipointItemMappingInfo
    Inherits MapItemMappingInfo

Remarks

Use MapMultipointItemMappingInfo to specify mappings that ListSourceDataAdapter uses to generate map polylines or polygons. To specify the type of generated items, assign a MapPolylineSettings or MapPolygonSettings object to the ListSourceDataAdapter.ItemSettings property.

The MapMultipointItemMappingInfo class introduces the Points property that defines the name of a data source member that contains polyline or polygon points.

Example

How to: Generate Polylines from a Data Source

This example demonstrates how to generate map polylines based on data source objects and how to display these polylines on a vector layer.

1. Create a ListSourceDataAdapter object and assign it to the VectorLayer.Data property.

2. Specify the adapter’s DataSource property.

3. Create a MapMultipointItemMappingInfo object and assign it to the adapter’s Mappings property.

4. Map the following properties to data source fields:

   • Points – Specifies a data source field that contains polyline points.
   • Latitude – Specifies a data field that contains point latitudes. (Use the YCoordinate property for Cartesian coordinate systems.)
   • Longitude – Specifies a data field that contains point longitudes. (Use the XCoordinate property for Cartesian coordinate systems.)

5. To specify the type of created map items, assign the appropriate settings to the ListSourceDataAdapter.ItemSettings property. In this example, use MapPolylineSettings to draw polylines.

XAML

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MapApp"
        xmlns:dxm="http://schemas.devexpress.com/winfx/2008/xaml/map" 
        x:Class="MapApp.MainWindow"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Grid>
        <dxm:MapControl x:Name="mapControl">
            <!-- You can optionally create a background image layer. -->
            <dxm:ImageLayer>
                <dxm:BingMapDataProvider Kind="RoadGray" 
                                         BingKey="Insert your Bing key." />
            </dxm:ImageLayer>

            <dxm:VectorLayer x:Name="vectorLayer" DataLoaded="OnVectorLayerDataLoaded">
                <dxm:VectorLayer.Data>
                    <dxm:ListSourceDataAdapter x:Name="listSourceDataAdapter" 
                                               DataSource="{Binding}">
                        <dxm:ListSourceDataAdapter.Mappings>
                            <dxm:MapMultipointItemMappingInfo Latitude="X" 
                                                              Longitude="Y" 
                                                              Points="PointSource"/>
                        </dxm:ListSourceDataAdapter.Mappings>
                        <dxm:ListSourceDataAdapter.ItemSettings>
                            <dxm:MapPolylineSettings Stroke="Red">
                                <dxm:MapPolylineSettings.StrokeStyle>
                                    <dxm:StrokeStyle Thickness="2"/>
                                </dxm:MapPolylineSettings.StrokeStyle>
                            </dxm:MapPolylineSettings>
                        </dxm:ListSourceDataAdapter.ItemSettings>
                    </dxm:ListSourceDataAdapter>
                </dxm:VectorLayer.Data>
            </dxm:VectorLayer>
        </dxm:MapControl>
    </Grid> 
</Window>

C#

using DevExpress.Xpf.Map;
using System.Collections.ObjectModel;
using System.Windows;
using System.Windows.Media;

namespace MapApp {
    public partial class MainWindow : Window {
        ObservableCollection<Line> Data { get; set; }
        public MainWindow() {
            InitializeComponent();

            Data = new ObservableCollection<Line>();

            Line line1 = new Line();
            line1.PointSource.Add(new Coordinate(-5.93107, -35.112723));
            line1.PointSource.Add(new Coordinate(-10.13507, -25.15696));
            line1.PointSource.Add(new Coordinate(-5.183714, -8.911391));
            line1.PointSource.Add(new Coordinate(4.253438, 5.47072));
            Data.Add(line1);

            Line line2 = new Line();
            line2.PointSource.Add(new Coordinate(1, 0.5));
            line2.PointSource.Add(new Coordinate(-25, -15));
            line2.PointSource.Add(new Coordinate(-15, -25));
            line2.PointSource.Add(new Coordinate(-22.1531, -41.45984));
            Data.Add(line2);

            this.DataContext = Data;
        }
        private void OnVectorLayerDataLoaded(object sender, DataLoadedEventArgs e) {
            mapControl.ZoomToFitLayerItems(new LayerBase[] { vectorLayer }, paddingFactor: 0.3);
        }
    }
    public struct Coordinate {
        public double X { get; }
        public double Y { get; }
        public Coordinate(double x, double y) {
            X = x;
            Y = y;
        }
    }

    public class Line {
        public ObservableCollection<Coordinate> PointSource { get; } = new ObservableCollection<Coordinate>();
    }
}

VB.NET

Imports DevExpress.Xpf.Map
Imports System.Collections.ObjectModel
Imports System.Windows.Media
Namespace MapApp
    Public Partial Class MainWindow
        Inherits Window
        Private Property Data As ObservableCollection(Of Line)
        Public Sub New()
            InitializeComponent()
            Data = New ObservableCollection(Of Line)()
            Dim line1 As Line = New Line()
            line1.PointSource.Add(New Coordinate(-5.93107, -35.112723))
            line1.PointSource.Add(New Coordinate(-10.13507, -25.15696))
            line1.PointSource.Add(New Coordinate(-5.183714, -8.911391))
            line1.PointSource.Add(New Coordinate(4.253438, 5.47072))
            Data.Add(line1)
            Dim line2 As Line = New Line()
            line2.PointSource.Add(New Coordinate(1, 0.5))
            line2.PointSource.Add(New Coordinate(-25, -15))
            line2.PointSource.Add(New Coordinate(-15, -25))
            line2.PointSource.Add(New Coordinate(-22.1531, -41.45984))
            Data.Add(line2)
            Me.DataContext = Data
        End Sub
        Private Sub OnVectorLayerDataLoaded(ByVal sender As Object, ByVal e As DataLoadedEventArgs)
            mapControl.ZoomToFitLayerItems(New LayerBase() {vectorLayer}, paddingFactor:=0.3)
        End Sub
    End Class
    Public Structure Coordinate
        Public ReadOnly Property X As Double
        Public ReadOnly Property Y As Double
        Public Sub New(ByVal x As Double, ByVal y As Double)
            Me.X = x
            Me.Y = y
        End Sub
    End Structure
    Public Class Line
        Public ReadOnly Property PointSource As ObservableCollection(Of Coordinate) = New ObservableCollection(Of Coordinate)()
    End Class
End Namespace

Inheritance

Object

DispatcherObject

DependencyObject

Freezable

MapDependencyObject

MapPointMappingInfoBase

MapItemMappingInfoBase

MapItemMappingInfo

MapMultipointItemMappingInfo