VectorTileDataProviderBase Class

The base class for vector tile data providers.

Assembly: DevExpress.XtraMap.v22.1.dll

Declaration

C#
VB.NET

public abstract class VectorTileDataProviderBase :
    ImageTileDataProvider,
    IVectorTileStreamProvider

Public MustInherit Class VectorTileDataProviderBase
    Inherits ImageTileDataProvider
    Implements IVectorTileStreamProvider

Remarks

Follow the steps below to implement a provider that loads tiles from a custom source.

Create a provider class that implements VectorTileDataProviderBase.
Implement the VectorTileDataProviderBase.GetStream method so that it returns a tile as a sequence of bytes for specific coordinates in the tile grid at the specified zoom level.

Assign the provider to the ImageLayer.DataProvider property.

View Example

C#
VB.NET

using DevExpress.XtraMap;
using System.IO;
using System.Windows.Forms;

namespace WinFormsMap {
    public partial class Form1 : Form {
        public Form1() {
            InitializeComponent();
            var layer = new ImageLayer();
            var provider = new CustomVectorTileStreamProvider();

            layer.DataProvider = provider;
            mapControl1.Layers.Add(layer);
        }
    }
    public class CustomVectorTileStreamProvider : VectorTileDataProviderBase {
        public override Stream GetStream(long x, long y, long level) {
            string path = Path.GetFullPath("..\\..\\Data\\test.data");
            return File.OpenRead(path);
        }
    }
}

Imports DevExpress.XtraMap
Imports System.IO
Imports System.Windows.Forms

Namespace WinFormsMap

    Public Partial Class Form1
        Inherits Form

        Public Sub New()
            InitializeComponent()
            Dim layer = New ImageLayer()
            Dim provider = New CustomVectorTileStreamProvider()
            layer.DataProvider = provider
            mapControl1.Layers.Add(layer)
        End Sub
    End Class

    Public Class CustomVectorTileStreamProvider
        Inherits VectorTileDataProviderBase

        Public Overrides Function GetStream(ByVal x As Long, ByVal y As Long, ByVal level As Long) As Stream
            Dim path As String = System.IO.Path.GetFullPath("..\..\Data\test.data")
            Return File.OpenRead(path)
        End Function
    End Class
End Namespace