AddOverlay(MapView,Geometry,CIMSymbolReference,Double,Double) Method

In This Topic

Add an overlay graphic to the map view.

Syntax

C#
Visual Basic (Declaration)

public static IDisposable AddOverlay( 
   MapView mapView,
   Geometry geometry,
   CIMSymbolReference symbol,
   double referenceScale,
   double showThrough
)

Public Overloads Shared Function AddOverlay( _
   ByVal mapView As MapView, _
   ByVal geometry As Geometry, _
   ByVal symbol As CIMSymbolReference, _
   ByVal referenceScale As Double, _
   ByVal showThrough As Double _
) As IDisposable

Parameters

mapView: The view to add the overlay.
geometry: The geometry of the overlay.
symbol: The symbol to use for the overlay.
referenceScale: Map reference scale or -1
showThrough: Visibility factor for showing the overlay through other objects when obscured in 3D.
Valid range is [0..1], any other value will be treated as 0 (not visible).

Return Value

An object that when disposed will remove the overlay.

Remarks

When the referenceScale is not equal to -1, the overlay will be created in real world units relative to the provided map reference scale (referenceScale). Otherwise, the overlay will be created in units of points. This is only supported in 2D.

Example

Graphic Overlay

//Defined elsewhere
private IDisposable _graphic = null;
public async void GraphicOverlaySnippetTest()
{
  // get the current mapview and point
  var mapView = MapView.Active;
  if (mapView == null)
    return;
  var myextent = mapView.Extent;
  var point = myextent.Center;

  // add point graphic to the overlay at the center of the mapView
  _graphic = await QueuedTask.Run(() =>
  {
    //add these to the overlay
    return mapView.AddOverlay(point,
        SymbolFactory.Instance.ConstructPointSymbol(
                ColorFactory.Instance.RedRGB, 30.0, SimpleMarkerStyle.Star).MakeSymbolReference());
  });

  // update the overlay with new point graphic symbol
  MessageBox.Show("Now to update the overlay...");
  await QueuedTask.Run(() =>
  {
    mapView.UpdateOverlay(_graphic, point, SymbolFactory.Instance.ConstructPointSymbol(
                                  ColorFactory.Instance.BlueRGB, 20.0, SimpleMarkerStyle.Circle).MakeSymbolReference());
  });

  // clear the overlay display by disposing of the graphic
  MessageBox.Show("Now to clear the overlay...");
  _graphic.Dispose();

}

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

MappingExtensions Class
MappingExtensions Members
Overload List

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