topic Re: QueryPoint from end of the line....not start in ArcGIS Pro SDK Questions

QueryPoint from end of the line....not start

BrianBulla — Fri, 26 Jun 2020 14:02:18 GMT

Is there a simple way to use GeometryEngine.Instance.QueryPoint to get a point a specified distance from the end of the line? It seems to default to the start of the line??

Or do I just need to add some math logic to my code??

Re: QueryPoint from end of the line....not start

Anonymous User — Sun, 12 Dec 2021 10:53:56 GMT

Hey Brian,

Yes you can simply reverse the orientation of your line geometry and do the querypoint using the original distance.

      var reverseGeom = GeometryEngine.Instance.ReverseOrientation(geometry as Multipart);
      var qPoint = GeometryEngine.Instance.QueryPoint(reverseGeom, SegmentExtension.NoExtension, dac, AsRatioOrLength.AsLength);‍‍‍‍‍‍

or alternatively get the length of the geometry and work out the new query point distance.

      var length2D = GeometryEngine.Instance.Length(geometry);   
      var newDistance = length2D - originalDistance;
      var qPoint = GeometryEngine.Instance.QueryPoint(geometry, SegmentExtension.NoExtension, newDistance, AsRatioOrLength.AsLength);‍‍‍‍‍‍‍‍‍

Re: QueryPoint from end of the line....not start

BrianBulla — Fri, 26 Jun 2020 16:47:05 GMT

Hi Sean Jones‌. I ended up just doing math on it, but it's good to know about the ReverseOrientation option.

Thanks!