MapSpline Class

Draws a spline on the map.

Assembly: DevExpress.XtraMap.v20.1.dll

Declaration

C#
VB.NET

public class MapSpline :
    MapPolylineBase

Public Class MapSpline
    Inherits MapPolylineBase

Related API Members

The following members accept/return MapSpline objects:

Remarks

The Map Control uses vector layers to display vector items such as map splines.

The following image shows a spline that is plotted based on four geographical points.

Create a Map Spline

The following code creates a MapSpline and adds it to a vector layer's item storage.

C#
VB.NET

using DevExpress.XtraMap;
using System;
using System.Drawing;
using System.Windows.Forms;
//...
private void Form1_Load(object sender, EventArgs e) {

    VectorItemsLayer itemLayer = new VectorItemsLayer();
    mapControl1.Layers.Add(itemLayer);            

    MapSpline mapSpline = new MapSpline();
    mapSpline.Points.AddRange ( new GeoPoint[] {
        new GeoPoint(64.1, -40.5),
        new GeoPoint(65.4, -33.8),
        new GeoPoint(64.5, -28.5),
        new GeoPoint(65.5, -24.5)
    });        

    MapItemStorage storage = new MapItemStorage();
    storage.Items.Add(mapSpline);            

    itemLayer.Data = storage;
    itemLayer.DataLoaded += OnItemLayerDataLoaded;            
}

private void OnItemLayerDataLoaded(object sender, DataLoadedEventArgs e) {
    // You can call the MapControl.ZoomToFitLayerItems method in the DataLoaded event handler
    // to zoom the map so that it displays all vector items according to their bounding box.
    mapControl1.ZoomToFitLayerItems(new LayerBase[] { mapControl1.Layers[1] });
}

Imports DevExpress.XtraMap
Imports System.Drawing
Imports System.Windows.Forms
'...
Private Sub Form1_Load(ByVal sender As Object, ByVal e As EventArgs)
    Dim layer As ImageLayer = New ImageLayer()
    layer.DataProvider = New BingMapDataProvider With {
        .BingKey = "Your-BingKey-here",
        .Kind = BingMapKind.Road
    }
    mapControl1.Layers.Add(layer)
    Dim itemLayer As VectorItemsLayer = New VectorItemsLayer()
    mapControl1.Layers.Add(itemLayer)
    Dim mapSpline As MapSpline = New MapSpline()
    mapSpline.Points.AddRange(New GeoPoint() {New GeoPoint(64.1, -40.5), New GeoPoint(65.4, -33.8), New GeoPoint(64.5, -28.5), New GeoPoint(65.5, -24.5)})
    Dim storage As MapItemStorage = New MapItemStorage()
    storage.Items.Add(mapSpline)
    itemLayer.Data = storage
    itemLayer.DataLoaded += AddressOf OnItemLayerDataLoaded
End Sub

Private Sub OnItemLayerDataLoaded(ByVal sender As Object, ByVal e As DataLoadedEventArgs)
    ' You can call the MapControl.ZoomToFitLayerItems method in the DataLoaded event handler
    ' to zoom the map so that it displays all vector items according to their bounding box.
    mapControl1.ZoomToFitLayerItems(New LayerBase() {mapControl1.Layers(1)})
End Sub

You can add multiple MapSplines to a vector layer. For more information on how to load vector items to a map, see the Providing Data topic.

Customize Spline Appearance

Use the following properties to specify spline color and style at normal, highlighted and selected states.

State	APIs
Normal	MapItem.Stroke, MapItem.StrokeWidth
Highlighted	MapItem.HighlightedStroke, MapItem.HighlightedStrokeWidth
Selected	MapItem.SelectedStroke, MapItem.StrokeWidth

The following example shows how to create a red spline. When the spline is highlighted or selected, its color is changed to blue/black respectively.

C#
VB.NET

mapSpline.Stroke = Color.Red;
mapSpline.StrokeWidth = 4;
mapSpline.HighlightedStroke = Color.Blue;
mapSpline.HighlightedStrokeWidth = 4;
mapSpline.SelectedStroke = Color.Black;
mapSpline.SelectedStrokeWidth = 4;

mapSpline.Stroke = Color.Red
mapSpline.StrokeWidth = 4
mapSpline.HighlightedStroke = Color.Blue
mapSpline.HighlightedStrokeWidth = 4
mapSpline.SelectedStroke = Color.Black
mapSpline.SelectedStrokeWidth = 4