topic Re: GraphicsOverlay HitTestAsync replacement in 100.1 in .NET Maps SDK Questions

GraphicsOverlay HitTestAsync replacement in 100.1

ChrisSmith10 — Fri, 08 Sep 2017 16:25:44 GMT

Is there a replacement for GraphicsOverlay.HitTestAsync Method (ViewBase, Rect, Int32) in runtime 100.1?

Re: GraphicsOverlay HitTestAsync replacement in 100.1

JenniferNery — Fri, 08 Sep 2017 18:42:51 GMT

The v100.x equivalent for this method is IdentifyGraphicsOverlayAsync providing a tolerance parameter will create the rectangle with this height and width, you can also provide the number of maximum results you want returned. There's also an overload for identifying all graphics overlays versus this one where hit test (or identify) will be done on specified graphics overlay only.

Re: GraphicsOverlay HitTestAsync replacement in 100.1

ChrisSmith10 — Fri, 08 Sep 2017 18:46:34 GMT

Jennifer,

The IdentifyGraphicsOverlayAsync method only allows for a square to be specified where GraphicsOverlay.HitTestAsync Method (ViewBase, Rect, Int32) allows a rectangle.

Our use case is allowing the user to drag a selection rectangle on the map to select objects.

Re: GraphicsOverlay HitTestAsync replacement in 100.1

JenniferNery — Sat, 11 Dec 2021 21:44:53 GMT

I think you can use GeometryEngine methods then to see if your selection rectangle intersects with the graphic geometries.

        private async void OnSelect(object sender, RoutedEventArgs e)
        {
            try
            {
                var rectangle = await MyMapView.SketchEditor.StartAsync(SketchCreationMode.Rectangle, false);
                foreach (var overlay in MyMapView.GraphicsOverlays)
                {
                    foreach (var graphic in overlay.Graphics)
                        graphic.IsSelected = GeometryEngine.Intersects(graphic.Geometry, rectangle);
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message, ex.GetType().Name);
            }
        }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: GraphicsOverlay HitTestAsync replacement in 100.1

ChrisSmith10 — Fri, 08 Sep 2017 19:16:53 GMT

Jennifer,

Thank you very much. I'll give that a try.

Re: GraphicsOverlay HitTestAsync replacement in 100.1

ChrisSmith10 — Sat, 09 Sep 2017 14:17:24 GMT

Jennifer,

Your suggestion worked well. Thank you.