Assign coordinate systems to an AutoCAD Civil 3D DWG file using API

By Partha Sarkar

In AutoCAD Civil 3D user interface (UI), in the 'Drawing Settings' dialog, at 'Units and Zone' tab, we can select a geographic coordinate system from the available list and apply the same to the current DWG file.

Here is a C# .NET code snippet which demonstrates how to do the same using .NET API -

 

//start a transaction

using (Transaction trans = db.TransactionManager.StartTransaction())

{

 

    using (Autodesk.AutoCAD.ApplicationServices.DocumentLock locker = AcadApp.DocumentManager.MdiActiveDocument.LockDocument())

        {                   

 

          // perform any document / database modifications here  

          SettingsDrawing settingsDWG = civilDoc.Settings.DrawingSettings;                   

          //settingsDWG.UnitZoneSettings.CoordinateSystemCode = "LL84";

          settingsDWG.UnitZoneSettings.CoordinateSystemCode = "FL83-EF";

          ed.WriteMessage("\nCoordinateSystemCode = " + settingsDWG.UnitZoneSettings.CoordinateSystemCode.ToString());

 

        }

 

    trans.Commit();

}