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You are viewing help content for pre-release software. This document and the features it describes are subject to change.

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.v21.2.dll

Declaration

public class MapMultipointItemMappingInfo :
    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.

A map with two polylines

  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.

<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>
using DevExpress.Xpf.Map;
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>();
    }
}
See Also