GeoUtils.CalculateArea(MapShape) Method

Computes the closed shape area.

Namespace: DevExpress.Xpf.Map

Assembly: DevExpress.Xpf.Map.v23.2.dll

NuGet Package: DevExpress.Wpf.Map

Declaration

C#

public static double CalculateArea(
    MapShape shape
)

VB.NET

Public Shared Function CalculateArea(
    shape As MapShape
) As Double

Parameters

Name	Type	Description
shape	MapShape	The closed map shape whose area is calculated.

Returns

Type	Description
Double	The map shape area in squire meters.

Remarks

You can use the CalculateArea method to determine an area of the following vector items:

• MapEllipse
• MapPath
• MapPolygon
• MapRectangle

The following example shows how to compute the selected map shape’s area when the MapControl.SelectionChanged event occurs:

C#

private void MapControl_SelectionChanged(object sender, MapItemSelectionChangedEventArgs e) {
    MapShape mapShape = vectorLayer.SelectedItems[0] as MapShape;
    double areaByShape = GeoUtils.CalculateArea(mapShape) / 1000000;            
    label.Content = $"Shape Area: {areaByShape:F2} km²";
}

VB.NET

Private Sub MapControl_SelectionChanged(ByVal sender As Object, ByVal e As MapItemSelectionChangedEventArgs)
    Dim mapShape As MapShape = CType(vectorLayer.SelectedItems(0),MapShape)
    Dim areaByShape As Double = (GeoUtils.CalculateArea(mapShape) / 1000000)
    label.Content = "Shape Area: {areaByShape:F2} km²"
End Sub