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

C#
Visual Basic (Declaration)

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

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

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

//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));
});

Expand Extent Synchronous

public Task<bool> ExpandExtentAsync(double dx, double dy)
{
  return QueuedTask.Run(() =>
  {
    //Get the active map view.
    var mapView = MapView.Active;
    if (mapView == null)
      return false;

    //Expand the current extent by the given ratio.
    var extent = mapView.Extent;
    var newExtent = ArcGIS.Core.Geometry.GeometryEngine.Instance.Expand(extent, dx, dy, true);
    return mapView.ZoomTo(newExtent);
  });
}

Zoom To a Point

public Task<bool> ZoomToPoint(double x, double y, ArcGIS.Core.Geometry.SpatialReference spatialReference)
{
  //Get the active map view.
  var mapView = MapView.Active;
  if (mapView == null)
    return Task.FromResult(false);

  return QueuedTask.Run(() =>
  {
    //Note: Run within QueuedTask
    //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
    return mapView.ZoomTo(poly, new TimeSpan(0, 0, 0, 3));
  });
}

Expand Extent

public Task<bool> ExpandExtentAsync(double dx, double dy)
{
  return QueuedTask.Run(() =>
  {
    //Get the active map view.
    var mapView = MapView.Active;
    if (mapView == null)
      return false;

    //Expand the current extent by the given ratio.
    var extent = mapView.Extent;
    var newExtent = ArcGIS.Core.Geometry.GeometryEngine.Instance.Expand(extent, dx, dy, true);
    return mapView.ZoomTo(newExtent);
  });
}

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

MapView Class
MapView Members
Overload List

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