VectorTileDataProviderBase.GetStream(Int64, Int64, Int64) Method

Returns a stream that contains a vector tile with specific coordinates at a specified zoom level.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v20.2.dll

NuGet Package: DevExpress.Win.Map

Declaration

C#

public virtual Stream GetStream(
    long x,
    long y,
    long level
)

VB.NET

Public Overridable Function GetStream(
    x As Long,
    y As Long,
    level As Long
) As Stream

Parameters

Name	Type	Description
x	Int64	An x-coordinate of a tile in the grid.
y	Int64	A y-coordinate of a tile in the grid.
level	Int64	A zoom level.

Returns

Type	Description
Stream	A stream that contains a tile.

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.

  C#

  using DevExpress.XtraMap;
  using System;
  using System.IO;
  using System.Windows.Forms;
  //...
  private void Form1_Load(object sender, EventArgs e) {
      ImageLayer layer = new ImageLayer();
      VectorTileProvider dataProvider = new VectorTileProvider();
      layer.DataProvider = dataProvider;
      mapControl1.Layers.Add(layer);
  }
  public class VectorTileProvider : VectorTileDataProviderBase {
      public override Stream GetStream(long x, long y, long level) {
          // Your implementation here.
      }
  }
  

  VB.NET

  Imports DevExpress.XtraMap
  Imports System
  Imports System.IO
  Imports System.Windows.Forms
  '...
  Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
      Dim layer As ImageLayer = New ImageLayer()
      Dim dataProvider As VectorTileProvider = New VectorTileProvider()
      layer.DataProvider = dataProvider
      mapControl1.Layers.Add(layer)
  End Sub
  Public Class VectorTileProvider
      Inherits VectorTileDataProviderBase
      Public Overrides Function GetStream(ByVal x As Long, ByVal y As Long, ByVal level As Long) As Stream
          ' Your implementation here.
      End Function
  End Class