SvgFileDataAdapter Class

A data adapter that loads data from SVG files, and displays it on vector layers.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v24.2.dll

Declaration

C#

public class SvgFileDataAdapter :
    FileDataAdapterBase,
    ISvgPointConverterFactory

VB.NET

Public Class SvgFileDataAdapter
    Inherits FileDataAdapterBase
    Implements ISvgPointConverterFactory

Remarks

SVG is a two-dimensional vector graphic format that uses an XML-based text format to describe images.

The image below shows a vector map loaded from an SVG file.

The following table lists supported SVG elements and related map items:

SVG element	Map item
<circle>	MapEllipse
<ellipse>	MapEllipse
<line>	MapLine
<path> (M,m,L,l,H,h,V,v,Z,z commands are supported)	MapPath
<polyline>	MapPolyline
<polygon>	MapPolygon
<rect>	MapRectangle

Note

The Map Control does not support the style element and style tag in the SVG markup.

Load SVG Data

Follow the steps below to load data from an SVG file:

• Create a new SvgFileDataAdapter object.
• Use the SvgFileDataAdapter.FileUri property to specify the path to an SVG file.
• Assign the adapter to the VectorItemsLayer.Data property.

C#

private void Form1_Load(object sender, EventArgs e) {
    Uri baseUri = new Uri(System.Reflection.Assembly.GetExecutingAssembly().Location);
    mapControl1.Layers.Add(new VectorItemsLayer {
        Data = new SvgFileDataAdapter {
            FileUri = new Uri(baseUri, "..\\..\\Data\\countries.svg")
        }
    });
}

VB.NET

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
    Dim baseUri As New Uri(System.Reflection.Assembly.GetExecutingAssembly().Location)
    mapControl1.Layers.Add(New VectorItemsLayer With { _
        .Data = New SvgFileDataAdapter With {.FileUri = New Uri(baseUri, "..\..\Data\countries.svg")} _
    })
End Sub

View Example

Access and Customize Map Items

When vector items are loaded, the FileDataAdapterBase.ItemsLoaded event occurs. Use the e.Items property to access map items.

C#

private void Form1_Load(object sender, EventArgs e) {
    Uri baseUri = new Uri(System.Reflection.Assembly.GetExecutingAssembly().Location);
    SvgFileDataAdapter adapter = new SvgFileDataAdapter();
    adapter.FileUri = new Uri(baseUri, "..\\..\\Data\\countries.svg");
    adapter.ItemsLoaded += Adapter_ItemsLoaded;
    mapControl1.Layers.Add(new VectorItemsLayer {
        Data = adapter
    });
}

private void Adapter_ItemsLoaded(object sender, ItemsLoadedEventArgs e) {
    foreach (MapItem item in e.Items) {
        item.Fill = System.Drawing.Color.Gray;
    }
}

VB.NET

 Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
  Dim baseUri As Uri = New Uri(System.Reflection.Assembly.GetExecutingAssembly().Location)
  Dim adapter As SvgFileDataAdapter = New SvgFileDataAdapter()
  adapter.FileUri = New Uri(baseUri, "..\..\Data\countries.svg")
  adapter.ItemsLoaded += AddressOf Adapter_ItemsLoaded
  mapControl1.Layers.Add(New VectorItemsLayer With {
      .Data = adapter
  })
  End Sub

  Private Sub Adapter_ItemsLoaded(ByVal sender As Object, ByVal e As ItemsLoadedEventArgs)
  For Each item As MapItem In e.Items
      item.Fill = System.Drawing.Color.Gray
  Next
  End Sub

Use the MapControl.ZoomToFitLayerItems method to zoom a map to fit layer items.

C#

private void Form1_Load(object sender, EventArgs e) {
  Uri baseUri = new Uri(System.Reflection.Assembly.GetExecutingAssembly().Location);
  SvgFileDataAdapter adapter = new SvgFileDataAdapter();
  adapter.FileUri = new Uri(baseUri, "..\\..\\Data\\countries.svg");
  VectorItemsLayer layer = new VectorItemsLayer();
  layer.Data = adapter;
  layer.DataLoaded += Layer_DataLoaded;
  mapControl1.Layers.Add(layer);
}

private void Layer_DataLoaded(object sender, DataLoadedEventArgs e) {
  mapControl1.ZoomToFitLayerItems();
}

VB.NET

Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
  Dim baseUri As Uri = New Uri(System.Reflection.Assembly.GetExecutingAssembly().Location)
  Dim adapter As SvgFileDataAdapter = New SvgFileDataAdapter()
  adapter.FileUri = New Uri(baseUri, "..\..\Data\countries.svg")
  Dim layer As VectorItemsLayer = New VectorItemsLayer()
  layer.Data = adapter
  layer.DataLoaded += AddressOf Layer_DataLoaded
  mapControl1.Layers.Add(layer)
End Sub

Private Sub Layer_DataLoaded(ByVal sender As Object, ByVal e As DataLoadedEventArgs)
  mapControl1.ZoomToFitLayerItems()
End Sub

You can change shape colors based on shape data. Refer to the following help topic for more information: Colorizers.

You can also group items of the same type. To do this, initialize the MapDataAdapterBase.Clusterer property with a clusterer.

Implements

IMapDataAdapter

Inheritance

Object

MapDisposableObject

MapDataAdapterBase

CoordinateSystemDataAdapterBase

DevExpress.XtraMap.OuterDataAdapterBase

FileDataAdapterBase

SvgFileDataAdapter