topic Re: How to convert selected feature from feature class to geometry in ArcGIS Pro SDK Questions

How to convert selected feature from feature class to geometry

JoshuaO_Neil — Wed, 14 Nov 2018 22:02:39 GMT

Hello,

I cannot figure out how to convert selected features from a feature dataset to geometry, so that I can zoom the map to the selected features (I want to zoom the map to only the selected state from the code below).

I have two layers in my map (project area and states). I was able to select the state from the states layer that intersects my project area polygon using the code below. However, I cannot figure out how to zoom the map to the selected state (the state that intersects with my project area boundary). I thought the last 2 lines of my code would do it, but that zooms the map to the entire states layer (not just the selected state). Does anyone know what I am doing wrong?

{
var layout = Project.Current.GetItems<LayoutProjectItem>()?.First().GetLayout();
if (layout == null) return;
MapFrame mf = layout.FindElement("Main Map") as MapFrame;
Map m = mf.Map;

FeatureLayer fl1 = m.FindLayers("ProjectArea1").First() as FeatureLayer;
QueryFilter queryFilter = new QueryFilter();

//Set up a spatial query
var spatialQuery = new SpatialQueryFilter()
{ FilterGeometry = geo, SpatialRelationship = SpatialRelationship.Intersects };

//Reference county layer and apply spatial query
FeatureLayer fl2 = m.FindLayers("States").First() as FeatureLayer;
fl2.Select(spatialQuery);

Geometry geo1 = fl2.QueryExtent();

Envelope env = geo1.Extent;
mf.ZoomTo(env);
}
}

Re: How to convert selected feature from feature class to geometry

GKmieliauskas — Thu, 15 Nov 2018 07:21:15 GMT

Hi Joshua,

Look at ArcGIS pro community sample:

https://github.com/Esri/arcgis-pro-sdk-community-samples/blob/master/Map-Exploration/IdentifyWithSketchTool/SelectAndZoom.cs

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Thu, 15 Nov 2018 19:33:04 GMT

Thanks, I can't seem to get this to work with my example. I can't figure out the code after fl2.Select(spatialQuery);

Re: How to convert selected feature from feature class to geometry

Wolf — Sun, 12 Dec 2021 08:43:33 GMT

I adapted your code snippet to an Add-in button and fixed your code. One feature in States is selected by using one feature from ProjectArea and the envelope of the selected States record is used to zoom the map to the selection. This is what I see after I click my test button:

This is the code behind for the button:

    protected override async void OnClick()
    {
      {
        Map m = MapView.Active.Map;
        if (m != null)
        {
          var env = await SelectStateAsync(m);
          if (env != null) await MapView.Active.ZoomToAsync(env);
        }
      }
    }

    private Task<Envelope> SelectStateAsync(Map m)
    {
      return QueuedTask.Run<Envelope>(() =>
      {
        Envelope selectionEnvelope = null;
        FeatureLayer fl1 = m.FindLayers("ProjectArea").FirstOrDefault() as FeatureLayer;
        if (fl1 == null) return selectionEnvelope;
        QueryFilter queryFilter = new QueryFilter();

        using (ArcGIS.Core.Data.RowCursor rowCursor = fl1.Search(queryFilter = null))
        {
          //Grab the first record (and hopefully only record)
          while (rowCursor.MoveNext())
          {
            //Grab the features geometry
            Feature feature1 = rowCursor.Current as Feature;
            Geometry geo = feature1.GetShape().Clone();
            //Set up a spatial query
            var spatialQuery = new SpatialQueryFilter()
            {
              FilterGeometry = geo,
              SpatialRelationship = SpatialRelationship.Intersects
            };
            //Reference county layer and apply spatial query
            FeatureLayer fl2 = m.FindLayers("States").FirstOrDefault() as FeatureLayer;
            if (fl2 != null)
            {
              // this selects the feature(s) in fl2
              var selection = fl2.Select(spatialQuery);
              // this get the envelope
              using (RowCursor rowCursor2 = selection.Search())
              {
                if (rowCursor2.MoveNext())
                {
                  // stop with the first extent
                  Geometry geo1 = (rowCursor2.Current as Feature).GetShape().Clone();
                  selectionEnvelope = geo1.Extent.Expand(1.1, 1.1, true);
                }
              }
            }
          }
        }
        return selectionEnvelope;
      });
    }‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Hope this helps.

Re: How to convert selected feature from feature class to geometry

GKmieliauskas — Fri, 16 Nov 2018 07:16:12 GMT

Hi Joshua,

I mean after grabbing feature geometry you could use code from sample:

//select features that intersect the sketch geometry
var selection = MapView.Active.SelectFeatures(geo, SelectionCombinationMethod.New);
IEnumerable<KeyValuePair<BasicFeatureLayer, List<long>>> result = from r in selection where string.Compare(r.Key.Name, "States", true) == 0 select r;
//zoom to selection
MapView.Active.ZoomToAsync(result.Select(kvp => kvp.Key), true, TimeSpan.FromSeconds(1.5), true);

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Tue, 04 Dec 2018 16:20:39 GMT

I greatly appreciate your assistance on this! I tried the above, and am still not getting the map zoomed to the selected state. Here is what I am getting. NY is selected, which is correct, but the map is zoomed to the entire states layer, not just NY.

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Tue, 04 Dec 2018 16:32:54 GMT

I apologize. I made a mistake. This worked!!!

I greatly appreciate your help.

One other question though is how I can get this to work if the project boundary crosses two states (I would need to zoom to two states instead of one).

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Tue, 04 Dec 2018 16:33:36 GMT

Thank you! I will try this as well.

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Tue, 04 Dec 2018 18:06:05 GMT

Also, now that this code has worked, how can I zoom out a bit more, such as a factor of 2?

Thanks!

Re: How to convert selected feature from feature class to geometry

GKmieliauskas — Wed, 05 Dec 2018 14:43:29 GMT

Change line:

selectionEnvelope = geo1.Extent.Expand(1.1, 1.1, true);

to:

selectionEnvelope = geo1.Extent.Expand(2, 2, true);

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Wed, 05 Dec 2018 20:05:54 GMT

I am new to coding, and have used the above code in an ArcGIS Pro button. However, I cannot seem to get any code to work after zooming to the states layer in the private Task<Envelope> SelectStateAsync(Map m) method. For example, if I want to create a new map frame and add it to the layout after that, why won't the code below work? Anything starting at the "public void BuildEnvelopeGeometry()" won't work.

protected override async void OnClick()
{
{
Map m = MapView.Active.Map;
if (m != null)
{
var env = await SelectStateAsync(m);
if (env != null) await MapView.Active.ZoomToAsync(env);
}
}
}

private Task<Envelope> SelectStateAsync(Map m)
{
return QueuedTask.Run<Envelope>(() =>
{
Envelope selectionEnvelope = null;
FeatureLayer fl1 = m.FindLayers("ProjectArea1").FirstOrDefault() as FeatureLayer;
if (fl1 == null) return selectionEnvelope;
QueryFilter queryFilter = new QueryFilter();

using (ArcGIS.Core.Data.RowCursor rowCursor = fl1.Search(queryFilter = null))
{
//Grab the first record (and hopefully only record)
while (rowCursor.MoveNext())
{
//Grab the features geometry
Feature feature1 = rowCursor.Current as Feature;
Geometry geo = feature1.GetShape().Clone();
//Set up a spatial query
var spatialQuery = new SpatialQueryFilter()
{
FilterGeometry = geo,
SpatialRelationship = SpatialRelationship.Intersects
};
//Reference county layer and apply spatial query
FeatureLayer fl2 = m.FindLayers("States").FirstOrDefault() as FeatureLayer;
if (fl2 != null)
{
// this selects the feature(s) in fl2
var selection = fl2.Select(spatialQuery);
// this get the envelope
using (RowCursor rowCursor2 = selection.Search())
{
if (rowCursor2.MoveNext())
{
// stop with the first extent
Geometry geo1 = (rowCursor2.Current as Feature).GetShape().Clone();
selectionEnvelope = geo1.Extent.Expand(1.1, 1.1, true);
}
}
}
}
return selectionEnvelope;
}
});
}
public void BuildEnvelopeGeometry()
{
//Build Envelope Geometry for Main Map Frame
Envelope mf_env_Main = EnvelopeBuilder.CreateEnvelope(new Coordinate2D(0.5, 2.5), new Coordinate2D(8.0, 10.5));

//Reference map, create MF and add to layout
MapProjectItem mapPrjItem_Main = Project.Current.GetItems<MapProjectItem>().FirstOrDefault(item => item.Name.Equals("Map"));
Map mfMap_Main = mapPrjItem_Main.GetMap();

MapFrame mfELM_Main = LayoutElementFactory.Instance.CreateMapFrame(LayoutView.Active.Layout, mf_env_Main, mfMap_Main);

mfELM_Main.SetName("Main Map");
}
}
}

Re: How to convert selected feature from feature class to geometry

GKmieliauskas — Thu, 06 Dec 2018 06:57:20 GMT

Hi Joshua,

There is no calling of BuildEnvelopeGeometry in your code.

Re: How to convert selected feature from feature class to geometry

JoshuaO_Neil — Thu, 06 Dec 2018 18:17:51 GMT

Is it just a fact of changing the method name to get the code to add a new map frame to work? For instance, when I had that same code snippet (starting at "//Build Envelope Geometry for Main Map Frame") without the code starting at "protected override async void OnClick()", it worked. When I added the "//Build Envelope Geometry for Main Map Frame" code above it now it doesn't work.

One difference is that it was under the method "protected override async void OnClick()", but now since I added the "private Task<Envelope> SelectStateAsync(Map m)" method, I had to create a new method to place it within, below the "private Task<Envelope> SelectStateAsync(Map m)" method. Thats where I am having a problem. How do I add code after that method?

Re: How to convert selected feature from feature class to geometry

GKmieliauskas — Fri, 07 Dec 2018 06:53:27 GMT

Override modifier is required to extend or modify the abstract or virtual implementation of an inherited method, property, indexer, or event. ArcGIS Pro knows when you press Add-in button it needs to call OnClick method which you override for each Add-in button. You need to insert call of your BuildEnvelopeGeometry method for example at the end of OnClick method, like BuildEnvelopeGeometry();