Add a floating graphic to Map

BrianBulla

Hi,

Is it possible to add a graphic to the active Map that floats in space and doesn't change position when panning the map?  What I want to do is have a cross-hair type graphic centred around the centre of the map, and when the user pans around I will then use the Maps camera co-ordinate to do things with.

Hopefully that makes sense.  I've added graphics before, but they've always been tied to a specific location on the map, and hence move with the map when panning.  I kind of want the opposite effect.

CharlesMacleod

you want a "MapViewOverlayControl". It is, essentially, a wrapper around a "standard" WPF User Control that u can add to the MapView control overlay. This overlay is used by Pro for user control content (as opposed to graphics elements content) - such as the Time slider, Edit sketch toolbar, Navigation tool "compass/navigator", and so on that sits "on top of" the map view.

To use it, create a user control - in this case it sounds like it will be something like a WPF canvas that contains your cross-hair image, centered. Wrap the user control with a MapViewOverlayControl and then add _that_ to the map view control overlay with mapView.AddOverlayerControl(....) : MapViewOverlayControl 

You should also look at the scribble control sample - it uses the map view overlay to hold a scribble control allowing users to "scribble" or "annotate" markup directly on top of the mapview (via a MapViewOverlayControl wrapping the scribble control). https://github.com/Esri/arcgis-pro-sdk-community-samples/tree/master/Map-Exploration/ScribbleControl_ArcGISPro 

 

Your code to add the overlay control will look something like this:

var crossHairControl = new CrossHairControl(); //your user control
//do any required configuration upfront
crossHairControl.Foo = ....;
crossHairControl.Bar = ....;

//Create a MapViewOverlayControl. 
var mapViewOverlayControl = new MapViewOverlayControl(
      crossHairControl, true, true, 
      true, OverlayControlRelativePosition.Center, .5, .8);
//Add to the active map view
MapView.Active.AddOverlayControl(mapViewOverlayControl);