topic Re: Map3d point3d to Coordinate in C# in .NET Forum

Map3d point3d to Coordinate in C#

dwattersQJ39E — Tue, 05 Mar 2024 18:32:12 GMT

Hello,
I am looking to get the Lat/Long value of a point3d (x,y,0)

I have a coordinate system set (AZ83-CF for this example)
and I am using a blocks position as my point3d.

I have done this in LISP before but now need to perform this as part of a larger C# program.

(setq ename (car ent)) (setq start_pnt (cadr ent)) (setq PROJECTIONSOURCE (ade_projgetwscode)) (ade_projsetsrc PROJECTIONSOURCE) (ade_projsetdest "LL84") (setq longlat (ade_projptforward start_pnt))

Thanks for any help.

Re: Map3d point3d to Coordinate in C#

hosneyalaa — Tue, 05 Mar 2024 19:15:52 GMT

@dwattersQJ39E

Can you see this

https://www.keanw.com/2014/06/attaching-geo-location-data-to-an-autocad-drawing-using-net.html

Re: Map3d point3d to Coordinate in C#

dwattersQJ39E — Tue, 05 Mar 2024 19:27:22 GMT

this looks promising!
i believe what i am actually looking for is TransformToLonLatAlt
but this looks like it will put me on the right path.
thanks!

Re: Map3d point3d to Coordinate in C#

dwattersQJ39E — Wed, 06 Mar 2024 14:27:57 GMT

for anyone else :

private static bool HasGeoData(Database db) { // Check whether the drawing already has geolocation data bool hasGeoData = false; try { var gdId = db.GeoDataObject; hasGeoData = true; } catch { } return hasGeoData; } private static Tuple<Point3d, string> TranslateGeoPoint(Database db, Point3d inPt, bool fromDwg) { using (var tr = db.TransactionManager.StartOpenCloseTransaction()) { var gd =tr.GetObject(db.GeoDataObject, OpenMode.ForRead)as GeoLocationData; var outPt =(fromDwg ? gd.TransformToLonLatAlt(inPt) : gd.TransformFromLonLatAlt(inPt)); var cs = gd.CoordinateSystem; tr.Commit(); return new Tuple<Point3d, string>(outPt, cs); } } using (Transaction tr = db.TransactionManager.StartTransaction()) { if (!HasGeoData(db)) { ed.WriteMessage("\nCurrent drawing has no geo-location information."); return; } var res = TranslateGeoPoint(db, placementPoint, true); var lonlat = res.Item1; double pointLat = Math.Round(lonlat.Y, 5); double pointLong = Math.Round(lonlat.X, 5); LatLong = pointLat.ToString() + "," + pointLong.ToString(); tr.Commit(); }