Setting coordinate system for map using .net API

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You probably have already known that we can get the current coordinate system of map with following code snippet:

[CommandMethod("GetMapCoordinateSystem")]

public void GetMapCoordinateSystem()

{

AcMapMap currentMap = AcMapMap.GetCurrentMap();

string srs = currentMap.GetMapSRS();

Editor ed = Autodesk.AutoCAD.ApplicationServices.Application

.DocumentManager.MdiActiveDocument.Editor;

ed.WriteMessage("current coordinate system is : " + srs);

}

And I have been asked many times, how to set a coordinate system to a map? Here is the solution:

[CommandMethod("SetMapCoordinateSystem")]

public void SetMapCoordinateSystem()

{

//the parameter is coordinate system code

SetMapSRS("CA-I");

string wkt = AcMapMap.GetCurrentMap().GetMapSRS();

Editor ed = Autodesk.AutoCAD.ApplicationServices.Application

.DocumentManager.MdiActiveDocument.Editor;

MgCoordinateSystemFactory coordSysFac =

new MgCoordinateSystemFactory();

string code = coordSysFac.ConvertWktToCoordinateSystemCode(wkt);

ed.WriteMessage("\n MapSRS is Changed to: " + code + "\n");

}

public void SetMapSRS(string srsCode)

{

Autodesk.Gis.Map.MapApplication mapApp = Autodesk.Gis.Map

.HostMapApplicationServices.Application;

Autodesk.Gis.Map.Project.ProjectModel projModel

= mapApp.ActiveProject;

projModel.Projection = srsCode;

}

Hope this helps.

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