ZoomTo(Geometry,Nullable<TimeSpan>,Boolean) Method

In This Topic

Zoom the view to the extent defined by a geometry. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

Visual Basic (Declaration)
C#

Public Overloads Function ZoomTo( _
   ByVal geometry As Geometry, _
   Optional ByVal duration As Nullable(Of TimeSpan), _
   Optional ByVal maintainViewDirection As Boolean _
) As Boolean

public bool ZoomTo( 
   Geometry geometry,
   Nullable<TimeSpan> duration,
   bool maintainViewDirection
)

Parameters

geometry: The geometry defining the extent in which to zoom.
duration: The amount of time to navigate the view to the new camera position. If null it uses the default navigation duration.
maintainViewDirection: Indicates if the Pitch and Heading should remain the same after the navigation is completed. If false the Heading will be set to 15.0 and the Pitch will be set to -60.0. This parameter only effects 3D views.

Return Value

True if the navigation is completed, false if it was interrupted by another view navigation.

Exceptions

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

Remarks

This is equivalent to setting the extent of the view. Use this method in combination with the Extent property to get and then modify the view's extent. If the geometry's spatial reference is in a different spatial reference than the map this method projects the geometry into the spatial reference of the map.

Example

Zoom to a specified point

{
  double x = -122.45;
  double y = 37.75;
  double buffer_size = 0.1;
  //Create a point
  var pt = MapPointBuilderEx.CreateMapPoint(x, y,
                 SpatialReferenceBuilder.CreateSpatialReference(4326));
  //Buffer it - for purpose of zoom
  var poly = GeometryEngine.Instance.Buffer(pt, buffer_size);

  //do we need to project the buffer polygon?
  if (!MapView.Active.Map.SpatialReference.IsEqual(poly.SpatialReference))
  {
    //project the polygon
    poly = GeometryEngine.Instance.Project(poly, MapView.Active.Map.SpatialReference);
  }

  // Must run on MCT.
  QueuedTask.Run(() =>
  {
    //Zoom - add in a delay for animation effect
    MapView.Active.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
  });
}

Zoom To a Point

{
  // Note: Needs QueuedTask to run
  {
    //Create a point
    var pt = MapPointBuilderEx.CreateMapPoint(x, y, spatialReference);
    //Buffer it - for purpose of zoom
    var poly = GeometryEngine.Instance.Buffer(pt, buffer_size);

    //do we need to project the buffer polygon?
    if (!MapView.Active.Map.SpatialReference.IsEqual(poly.SpatialReference))
    {
      //project the polygon
      poly = GeometryEngine.Instance.Project(poly, MapView.Active.Map.SpatialReference);
    }

    //Zoom - add in a delay for animation effect
    mapView.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
  }
}

Rotate the map view

{
  //Get the camera for the view, adjust the heading and zoom to the new camera position.
  camera = mapView.Camera;
  camera.Heading = heading;
  await mapView.ZoomToAsync(camera, TimeSpan.Zero);
  //Or synchronously
  mapView.ZoomTo(camera, TimeSpan.Zero);
}

Expand Extent

{
  //Note: Needs QueuedTask to run
  {
    //Expand the current extent by the given ratio.
    var extent = mapView.Extent;
    var newExtent = GeometryEngine.Instance.Expand(extent, dx, dy, true);
    mapView.ZoomTo(newExtent);
  }
}

Requirements

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.0 or higher.

Reference

MapView Class
MapView Members
Overload List

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