ScreenToMap Method (MapView)

In This Topic

Converts a point in screen coordinates to a point in the coordinates of the map or scene. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public MapPoint ScreenToMap( 
   Point screenPoint
)

Public Function ScreenToMap( _
   ByVal screenPoint As Point _
) As MapPoint

Parameters

screenPoint: The point value in screen coordinates.

Return Value

The converted point in map coordinates.

Exceptions

Exception	Description
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.

Example

Calculate Selection tolerance in map units

//Selection tolerance for the map in pixels
var selectionTolerance = SelectionEnvironment.SelectionTolerance;
QueuedTask.Run(() =>
{
  //Get the map center
  var mapExtent = MapView.Active.Map.GetDefaultExtent();
  var mapPoint = mapExtent.Center;
  //Map center as screen point
  var screenPoint = MapView.Active.MapToScreen(mapPoint);
  //Add selection tolerance pixels to get a "radius".
  var radiusScreenPoint = new System.Windows.Point((screenPoint.X + selectionTolerance), screenPoint.Y);
  var radiusMapPoint = MapView.Active.ScreenToMap(radiusScreenPoint);
  //Calculate the selection tolerance distance in map uints.
  var searchRadius = GeometryEngine.Instance.Distance(mapPoint, radiusMapPoint);
});

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

MapView Class
MapView Members

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