MapImage.MappingPoints Property

Gets or sets a collection of image points whose coordinates are in the [0.0,1.0] range.

Namespace: DevExpress.XtraMap

Assembly: DevExpress.XtraMap.v24.1.dll

NuGet Package: DevExpress.Win.Map

Declaration

C#

public MapPointCollection MappingPoints { get; set; }

VB.NET

Public Property MappingPoints As MapPointCollection

Property Value

Type	Description
DevExpress.XtraMap.MapPointCollection	A collection of MapPoint objects.

Remarks

Mapping points are image coordinates that should be matched with map polygon vertices (points in the geographic coordinate system). The top-left corner of the image represents the origin of image coordinates.

Note that the number of map polygon vertices should be equal to the number of mapping points (see the map polygon’s Points property).

Example

The example below assigns a raster image to a map polygon.

C#

VectorItemsLayer VectorLayer { get { return mapControl.Layers[1] as VectorItemsLayer; } }
MapItemStorage ItemStorage { get { return VectorItemsLayer.Data as MapItemStorage; } }
//...
private void OnFormLoad(object sender, EventArgs e) {
    MapPolygon centralPark = new MapPolygon();

    centralPark.Points.Add(new GeoPoint(40.767809, -73.981249));
    centralPark.Points.Add(new GeoPoint(40.768458, -73.981477));
    centralPark.Points.Add(new GeoPoint(40.800273, -73.958291));
    centralPark.Points.Add(new GeoPoint(40.800396, -73.957846));
    centralPark.Points.Add(new GeoPoint(40.797011, -73.949683));
    centralPark.Points.Add(new GeoPoint(40.796626, -73.949541));
    centralPark.Points.Add(new GeoPoint(40.764918, -73.972547));
    centralPark.Points.Add(new GeoPoint(40.76523,  -73.973245));
    centralPark.Points.Add(new GeoPoint(40.764704, -73.973741));

    centralPark.Image.MappingPoints.Add(new MapPoint(0.056376, 0.998469));
    centralPark.Image.MappingPoints.Add(new MapPoint(0, 0.987196));
    centralPark.Image.MappingPoints.Add(new MapPoint(0, 0.007516));
    centralPark.Image.MappingPoints.Add(new MapPoint(0.033557, 0));
    centralPark.Image.MappingPoints.Add(new MapPoint(0.940268, 0));
    centralPark.Image.MappingPoints.Add(new MapPoint(0.991275, 0.0090466));
    centralPark.Image.MappingPoints.Add(new MapPoint(1, 0.981489));
    centralPark.Image.MappingPoints.Add(new MapPoint(0.910738, 0.981489));
    centralPark.Image.MappingPoints.Add(new MapPoint(0.908054, 1));

    centralPark.Image.Source = new Bitmap("..\\..\\Data\\CentralPark1.png");
    ItemStorage.Items.Add(centralPark);
}

VB.NET

Private ReadOnly Property VectorLayer As VectorItemsLayer
    Get
        Return TryCast(mapControl.Layers(1), VectorItemsLayer)
    End Get
End Property

Private ReadOnly Property ItemStorage As MapItemStorage
    Get
        Return TryCast(VectorItemsLayer.Data, MapItemStorage)
    End Get
End Property

Private Sub OnFormLoad(ByVal sender As Object, ByVal e As EventArgs)
    Dim centralPark As MapPolygon = New MapPolygon()
    centralPark.Points.Add(New GeoPoint(40.767809, -73.981249))
    centralPark.Points.Add(New GeoPoint(40.768458, -73.981477))
    centralPark.Points.Add(New GeoPoint(40.800273, -73.958291))
    centralPark.Points.Add(New GeoPoint(40.800396, -73.957846))
    centralPark.Points.Add(New GeoPoint(40.797011, -73.949683))
    centralPark.Points.Add(New GeoPoint(40.796626, -73.949541))
    centralPark.Points.Add(New GeoPoint(40.764918, -73.972547))
    centralPark.Points.Add(New GeoPoint(40.76523, -73.973245))
    centralPark.Points.Add(New GeoPoint(40.764704, -73.973741))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.056376, 0.998469))
    centralPark.Image.MappingPoints.Add(New MapPoint(0, 0.987196))
    centralPark.Image.MappingPoints.Add(New MapPoint(0, 0.007516))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.033557, 0))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.940268, 0))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.991275, 0.0090466))
    centralPark.Image.MappingPoints.Add(New MapPoint(1, 0.981489))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.910738, 0.981489))
    centralPark.Image.MappingPoints.Add(New MapPoint(0.908054, 1))
    centralPark.Image.Source = New Bitmap("..\..\Data\CentralPark1.png")
    ItemStorage.Items.Add(centralPark)
End Sub

The above code uses the following API members:

Member	Description
MapPolygon	The class used to draw a polygon on a map.
MapPolygon.Points	Gets or sets a collection of points defining the map polygon.
MapPolygon.Image	Returns options of the image that specifies the map polygon background.
MapImage.Source	Gets or sets a collection of image points whose coordinates are in the [0.0,1.0] range.
MapImage.MappingPoints	Gets or sets a collection of image points whose coordinates are in the [0.0,1.0] range.