topic Re: Rectangle not getting displayed on map ? in .NET Maps SDK Questions

Rectangle not getting displayed on map ?

VijitWadhwa — Tue, 31 Jul 2018 14:50:53 GMT

Hi,

I tried to zoom the map by drawing a rectangle on the map (i.e zooming a specific area) , the map zooms to the extent on which rectangle gets drawed, but I am unable to see the rectangle on my screen , I am sharing the code, can anyone tell me , what is my mistake ?

Re: Rectangle not getting displayed on map ?

dotMorten_esri — Tue, 31 Jul 2018 18:00:03 GMT

The editor only allows you to sketch a geometry, and is temporary while sketching. What you do with it afterwards is up to you. In this case you need to add it to the mapview afterwards. For instance by using a GraphicsOverlay.

Re: Rectangle not getting displayed on map ?

JenniferNery — Sat, 11 Dec 2021 18:40:54 GMT

Outside SketchEditor, there already is built-in feature that allows you to zoom-in/out by rectangle. It looks like this and can be used in combination with key press. Shift to zoom-in, Shift+Ctrl to zoom-out.

GeoView.ViewpointChanged event will be raised and you can GetCurrentViewpoint then to add target geometry to your map.

If you wish to call SetViewpoint yourself like you are doing now and need the geometry result from rectangle sketch to remain on your map, you will need to add this to your GraphicsOverlay. You can use any symbol that matches the type of geometry. Rectangle will be a polygon so any fill symbol will do.

public MainWindow()
{
    InitializeComponent();
    MyMapView.Map = new Map(Basemap.CreateTopographic());
    MyMapView.GraphicsOverlays.Add(new GraphicsOverlay());
}

private async void OnTest(object sender, RoutedEventArgs e)
{
    try
    {
        var geometry = await MyMapView.SketchEditor.StartAsync(SketchCreationMode.Rectangle, false);
        var overlay = MyMapView.GraphicsOverlays.FirstOrDefault();
        if (overlay == null)
            return;
        var symbol = new SimpleFillSymbol(SimpleFillSymbolStyle.Solid, Color.Transparent,
            new SimpleLineSymbol(SimpleLineSymbolStyle.Solid, Color.Red, 2));
        overlay.Graphics.Add(new Graphic(geometry, symbol));

        var _ = MyMapView.SetViewpointAsync(new Viewpoint(geometry));
    }
    catch (TaskCanceledException)
    {

    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, ex.GetType().Name);
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Wed, 01 Aug 2018 02:39:13 GMT

No , I don't want it to persist on mapView , but the problem is , I can't

even see the trail of rectangle been drawn.

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Wed, 01 Aug 2018 02:58:25 GMT

I don't want to add the rectangle on the map, I just want to see ,while it

gets drawn temporarily , but I am unable to see that. The map zooms to the

extent of the covered area while mouse is down , but I am unable to see the

trail of rectangle.

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Wed, 01 Aug 2018 03:00:13 GMT

Hi,

I know that feature is already available , but I want to implement on a

button click.I don't want to add the rectangle on the map, I just want to

see ,while it gets drawn temporarily , but I am unable to see that. The map

zooms to the extent of the covered area while mouse is down , but I am

unable to see the trail of rectangle.

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Wed, 01 Aug 2018 05:19:43 GMT

This problem occurs if a measuring toolbar is present on the screen, If I remove the measuring toolbar then i can see the rectangle, Otherwise the rectangle is not visible. How to resolve this ?

Re: Rectangle not getting displayed on map ?

JenniferNery — Sat, 11 Dec 2021 18:40:57 GMT

I see so you're not able to see the rectangle as it is drawn. What version of the api are you using? If it's earlier than v100.3, you might be hitting a bug on clearing GraphicsOverlays where sketch layer also gets removed.

If you have in your code `MyMapView.GraphicsOverlays.Clear()`, the workaround is to replace this line with

for (var counter = MyMapView.GraphicsOverlays.Count; counter > 0; counter--)
     MyMapView.GraphicsOverlays.RemoveAt(counter);‍‍

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Wed, 01 Aug 2018 17:38:39 GMT

The version I am using is 100.3 , but still I get this bug.

Re: Rectangle not getting displayed on map ?

JenniferNery — Sat, 11 Dec 2021 18:40:59 GMT

Can you confirm that commenting out `GraphicsOverlays.Clear()` or replacing this with `RemoveAt` fixes the issue?

Thanks.

I'm not able to reproduce the bug with v100.3, only in earlier version do I get no draw feedback once I've called GraphicsOverlays.Clear. I wanted to confirm so I can better help you, it might be a different issue you are hitting.

        public MainWindow()
        {
            InitializeComponent();

            MyMapView.Map = new Map(Basemap.CreateTopographic());
        }

        private void OnDraw(object sender, RoutedEventArgs e)
        {
            MyMapView.GraphicsOverlays.Clear();
            MyMapView.SketchEditor.StartAsync(SketchCreationMode.Rectangle, false);
        }‍‍‍‍‍‍‍‍‍‍‍‍

Re: Rectangle not getting displayed on map ?

JenniferNery — Wed, 01 Aug 2018 18:31:32 GMT

Hi Vijit,

I think I know what the problem is now that you mention MeasureToolbar.

Can you check and set ` MyMapView.SketchEditor.IsVisible = true;`. The measure toolbar hides active editors when enabled, but this should only happen when a specific mode is selected.

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Thu, 02 Aug 2018 10:56:19 GMT

Hi Jennifer,

Even if any specific mode was not selected, still the rectangle was not getting displayed. On setting the ` MyMapView.SketchEditor.IsVisible = true;` , I am able to see the rectangle, but the lines and polygons made by the measure toolbar get disappeared, How should i resolve it ?

Thanks

Re: Rectangle not getting displayed on map ?

JenniferNery — Sat, 11 Dec 2021 18:41:02 GMT

Thanks for confirming. I just logged MeasureToolbar bug here. Not having any mode selected, should not have interfered with current SketchEditor.

However, the behavior where the measure draw feedback disappears once another SketchEditor becomes active is by design. MapView can only be assigned one SketchEditor at a given time.

If you don't want the other SketchEditor draw session to be canceled, you can disable it first and assign to MapView once your draw/edit session is over. You can do this by keeping reference to the current SketchEditor.

public MainWindow()
{
    InitializeComponent();
    _sketchEditor = MyMapView.SketchEditor;
    MyMapView.Map = new Map(Basemap.CreateTopographic());
}

private readonly SketchEditor _sketchEditor;

private async void OnDraw(object sender, RoutedEventArgs e)
{
    SketchEditor otherSketchEditor = null;
    if (MyMapView.SketchEditor != _sketchEditor)
    {
        otherSketchEditor = MyMapView.SketchEditor;
        otherSketchEditor.IsVisible = false;
        otherSketchEditor.IsEnabled = false;
        MyMapView.SketchEditor = _sketchEditor;
    }
    try
    {

        MyMapView.SketchEditor.IsVisible = true;
        var geometry = await MyMapView.SketchEditor.StartAsync(SketchCreationMode.Rectangle, false);
        var _ = MyMapView.SetViewpointAsync(new Viewpoint(geometry));
    }
    catch (TaskCanceledException)
    {

    }
    catch (Exception ex)
    {
        MessageBox.Show(ex.Message, ex.GetType().Name);
    }
    if(otherSketchEditor != null)
    {
        otherSketchEditor.IsVisible = true;
        otherSketchEditor.IsEnabled = true;
        MyMapView.SketchEditor = otherSketchEditor;
    }
}‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Re: Rectangle not getting displayed on map ?

VijitWadhwa — Fri, 03 Aug 2018 04:48:15 GMT

Thankyou for your help