VectorItemsLayer.Data Property
Specifies the data source for the vector items layer.
Namespace: DevExpress.XtraMap
Assembly: DevExpress.XtraMap.v19.1.dll
Declaration
Property Value
| Type | Default | Description |
|---|---|---|
| IMapDataAdapter | *null* | An object implementing the IMapDataAdapter interface. |
Remarks
For more examples of the Data property in use, refer to the Providing Data Examples topic.
Example
The following example demonstrates how to create an array of vector items and display them on a map.
To show vector items on a map, do the following:
- Create a VectorItemsLayer and add it to the MapControl.Layers collection;
- Create a MapItemStorage object and assign it to the
VectorItemsLayer.Dataproperty; - Generate an array of MapItem class descendants (e.g., MapCallout) and add this array to the MapItemStorage.Items property.
The code below illustrates how this can be done.
Note
A complete sample project is available at https://github.com/DevExpress-Examples/how-to-manually-generate-vector-items-to-display-on-a-map-t114954
using System;
using System.Windows.Forms;
using DevExpress.XtraMap;
namespace AddItemsManually {
public partial class Form1 : Form {
public Form1() {
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e) {
// Create a map control with initial settings and add it to the form.
MapControl map = new MapControl()
{ Dock = DockStyle.Fill, ZoomLevel = 4, CenterPoint = new GeoPoint(43, 15) };
this.Controls.Add(map);
// Create a layer to load image tiles from OpenStreetMap.
ImageLayer tileLayer = new ImageLayer();
tileLayer.DataProvider = new OpenStreetMapDataProvider();
map.Layers.Add(tileLayer);
// Create a layer to display vector items.
VectorItemsLayer itemsLayer = new VectorItemsLayer();
map.Layers.Add(itemsLayer);
// Create a storage for map items and generate them.
MapItemStorage storage = new MapItemStorage();
MapItem[] capitals = GetCapitals();
storage.Items.AddRange(capitals);
itemsLayer.Data = storage;
}
// Create an array of callouts for 5 capital cities.
MapItem[] GetCapitals() {
return new MapItem[] {
new MapCallout() { Text = "London", Location = new GeoPoint(51.507222, -0.1275) },
new MapCallout() { Text = "Rome", Location = new GeoPoint(41.9, 12.5) },
new MapCallout() { Text = "Paris", Location = new GeoPoint(48.8567, 2.3508) },
new MapCallout() { Text = "Berlin", Location = new GeoPoint(52.52, 13.38) },
new MapCallout() { Text = "Madrid", Location = new GeoPoint(40.4, -3.68) }
};
}
}
}
Related GitHub Examples
The following code snippets (auto-collected from DevExpress Examples) contain references to the Data property.
Note
The algorithm used to collect these code examples remains a work in progress. Accordingly, the links and snippets below may produce inaccurate results. If you encounter an issue with code examples below, please use the feedback form on this page to report the issue.