AutoCAD DevBlog

Positioning GeographicMarker Using ObjectARX

By Madhukar Moogala

In addition to previous blog post we saw how we can add a GeoPositionMarker to a drawing with already GeographicMarker enabled.

In current blog we will see how we can leverage ObjectARX API to create GeoCoordinate system and place it in the drawing with user defined Latitudes and Longtitudes.

For this sample, I’m creating an UTM84-43N GIS coordinate system, Universal Transverse Mercator is not a single map projection, but divided in to sixty zones.

Here is an excerpt from Wikipedia about UTM.

The Universal Transverse Mercator (UTM) conformal projection uses a 2-dimensional Cartesian coordinate system to give locations on the surface of the Earth. Like the traditional method of latitude and longitude, it is ahorizontal position representation, i.e. it is used to identify locations on the Earth independently of vertical position. However, it differs from that method in several respects.

The UTM system is not a single map projection. The system instead divides the Earth into sixty zones, each being a six-degree band of longitude, and uses a secant transverse Mercator projection in each zone.

I’m using Latitude and Longitude values of our Autodesk’ Hyderabad office. : 17.434586,78.384402

Thanks to Tat-Lee for helping with suggestion while I was struggling to generate a Live map programmatically.

Do make note :

• AcGePoint3d is expected to be (long, lat) and not (lat, long)
• Reference point is in the coordinates of the projected coordinate system and not in geodetic.
• Design point is in model-space coordinates

C++ code:

void GeographicLocationMarker( )

{

      /*Map Projection type*/

    const AcString csId(L"UTM84-43N");

  /*Creating the projected Coordinate Sytem */

  Acad::ErrorStatus es;

    AcDbGeoCoordinateSystem* pGeoCS;

    AcDbGeoCoordinateSystem::create(csId, pGeoCS);

     if (NULL == pGeoCS)

        return;

     AcString xmlStr;

   /*Get XML type*/

   es = pGeoCS->getXmlRepresentation(xmlStr);

  /*Checking the output of CRS*/

  acutPrintf(_T("\ncrsName: %s"),xmlStr.kACharPtr());

 

    if(xmlStr.isEmpty()) return;

 

    AcDbObjectId geoId;

    AcDbObjectPointer<AcDbGeoData> pGeoData;

    AcDbDatabase* pDb = acdbHostApplicationServices()->workingDatabase();

    acdbGetGeoDataObjId(pDb, geoId);

 

  /*Post our Geodata to Database,

  AcDbGeoData is not an Entity, it is stored in Model-Space's Extension Dictionary*/

    if (geoId.isNull())

    {

        pGeoData.create();

        pGeoData->setBlockTableRecordId(acdbSymUtil()->blockModelSpaceId(pDb));

        pGeoData->postToDb(geoId);

    }

    else

    {

        pGeoData.open(geoId, AcDb::kForWrite);

    }

 

    if (NULL == pGeoData.object())

        return;

  /* The spatial coordinate system string.

  It can be the id of the coordinate system or the XML/WKT representation*/

     es = pGeoData->setCoordinateSystem(xmlStr);

  /* The design coordinate system is considered to be local, aka

     an engineering coordinate system.*/

  es = pGeoData->setCoordinateType(AcDbGeoData::kCoordTypLocal);

    es = pGeoData->setHorizontalUnits(AcDb::kUnitsMillimeters);

    es = pGeoData->setVerticalUnits(AcDb::kUnitsMillimeters);

    es = pGeoData->setDesignPoint(AcGePoint3d::kOrigin);

    es = pGeoData->setUpDirection(AcGeVector3d::kZAxis);

    /*Lat and Long of Hyderabad : 17.434586,78.384402*/

  /*Note: AcGePoint3d expected to be Long,Lat,alt*/

  AcGePoint3d refPtInUTM84, refPtInLatLong(78.384402,17.434586,0.0);

    /*Get WCS point*/

  pGeoData->transformFromLonLatAlt(refPtInLatLong,refPtInUTM84);

  pGeoData->setReferencePoint(refPtInUTM84);

  pGeoData->setNorthDirectionVector(AcGeVector2d::kYAxis);

 

      /*clean up*/

    delete pGeoCS;

    pGeoData.close();

 

 

  }

 

After the code,  turn on GEOMAP from ribbon or command, set type to Aerial view.

If you find difficult in loading Maps, make sure if you have logged in A360.

Here are few troubleshooting tips to generate Maps perfectly.

1. Log out of A360.
2. Quit AutoCAD.
3. Right-click the Autodesk 360 icon in the Windows system tray and choose  Exit.
4. Run  Windows Task manager and terminate the processes AcSettingsSync.exe and AdSync.exe if they are running.
5. Open a Windows File Explorer window and navigate to the following folder:
   %localappdata%\Autodesk
   Note: You can also paste "%localappdata%" into the address bar of a Windows File Explorer.
6. Delete the folder C:\Users\....\AppData\Local\Autodesk\Web Services.
7. Restart AutoCAD.

Adding Geopositionmarker To Different Location Through API

By Madhukar Moogala

Recently, I have received a query from an ADN partner about positioning Geomaps on AutoCAD, you can add GeoLocationData to AutoCAD drawing, this geolocation data is stored under Modelspace’s extension dictionary.

To can create programmatically GeoLocationData, please find this helpful blog.

In the current blog we ‘ll see how we can add new position marker to different place in the drawing with Geolocationdata.

At the end of code, I have uploaded a screencast, which shows moving from Autodesk’s Hyderabad Office to Autodesk’s Bangalore Office.

void addMarker(ads_point wcsPoint)

  {

  AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();

  if (pDb == NULL)

    return;

 

  AcGePoint3d pt(wcsPoint[0], wcsPoint[1], wcsPoint[2]);

  struct resbuf buf;

  double geoPositionMarkerRaidus = 0.0;

 

  if(acedGetVar(_T("GEOMARKPOSITIONSIZE"), &buf) == RTNORM)

    {

    geoPositionMarkerRaidus = buf.resval.rreal > 0 ?  buf.resval.rreal : 1.0;

    }

  double radius = geoPositionMarkerRaidus;

 

  AcDbSmartObjectPointer<AcDbGeoPositionMarker> pGeoPositionMarker;

  AcDbGeoPositionMarker *tmpMarker = new AcDbGeoPositionMarker(pt, radius, radius/2);

 

  pGeoPositionMarker.acquire(tmpMarker);

  if (eOkVerify(pGeoPositionMarker.openStatus()))

    {

    //set to current layer

    pGeoPositionMarker->setLayer( pDb->clayer() );

    AcDbObjectId modelSpaceId = acdbSymUtil()->blockModelSpaceId(pDb);

 

      {

      AcDbSmartObjectPointer<AcDbBlockTableRecord> modelSpaceBTR(modelSpaceId, AcDb::kForWrite);

      if (!eOkVerify(modelSpaceBTR.openStatus())) return ;

 

      //add position marker into db

      Acad::ErrorStatus es = Acad::eOk;

      AcDbObjectId newPositionMarkerId;

      es = modelSpaceBTR->appendAcDbEntity( newPositionMarkerId, pGeoPositionMarker);

      if (!eOkVerify(es))

        {

        return;

        }

      }

 

 

    }

  }

void InsertMarker()

  {

 

  CString prompt[2];

  prompt[0] = _T("Latitude");

  prompt[1] = _T("Longitude");

  CString keyword = _T("eXit");

  int limits[] = {90,180};

  double latLon[2];

  TCHAR result[133];

  int i=0;

  /*Get Lat and Long from user*/

  while(i<2)

    {

    if(RTERROR == acedInitGet(RSG_OTHER, keyword))

      {   

      assert(false);

      return;

      }

    int status = acedGetKword(prompt[i], result);

    if(status  == RTNORM)

      {

      double radian;

    if(_tcsicmp(_T(/*MSG0*/"eXit"), result) == 0)

      {

      return;

      }

    else if(acdbRawAngToF(result, 0, &radian) == RTNORM)

      {

      double degree = 180*radian/M_PI;

 

      if(fabs(degree) > limits[i])

        {

        acutPrintf(_T("\nInvalidInput"));

        }

      else

        {

        latLon[i] = degree;

        i++;

        }

      }

    else

      {

      acutPrintf(_T("\nInvalidInput"));

      }

      }

    else

      {

      return;

      }

    }

  AcDbObjectId geoDataId;

  if(eOkTest(acdbGetGeoDataObjId(acdbHostApplicationServices()->workingDatabase(), geoDataId)))

    {

    AcDbSmartObjectPointer<AcDbGeoData> pGeoData(geoDataId, AcDb::kForRead);

    if(eOkTest(pGeoData.openStatus()))

      {

      AcGePoint3d location;

      if(eOkTest(pGeoData->transformFromLonLatAlt(latLon[1], latLon[0], 0, location.x, location.y, location.z)))

        {

        addMarker(asDblArray(location));

        return;

        }

      }

    }

  }

Extracting Data From DXE file

By Madhukar Moogala

If you have an existing DXE file on your disk, it is possible to extract data to .csv file, and also retrieve information about the drawing file and external files if any source drawing referring to it.

Additionally you can refer to this blog which talks about imitating EATTEXT programmatically which uses Dataextraction API.

 

  public void extractSettingsFromDXE()

        {

        // Add the AcDx.dll reference from the inc folder

             Document doc = Application.DocumentManager.MdiActiveDocument;

            Editor ed = doc.Editor;

            Database db = doc.Database;

            StringBuilder fileContent = new StringBuilder();

            const string dxePath = @"C:\Mechanical_Multileaders.dxe";

            if (System.IO.File.Exists(dxePath))

            {

 

            /*Load DxE from disk*/

           IDxExtractionSettings extractionSettings = DxExtractionSettings.FromFile(dxePath);

 

 

            /*Retrieve Information about File Structure*/

           DxFileList files = extractionSettings.DrawingDataExtractor.Settings.DrawingList as DxFileList;

           IDxFileReference[] fileRefereces = files.Files;

           foreach (DxFileReference dwgFile in fileRefereces)

               {

               ed.WriteMessage("\nDrawingFile :{0}", dwgFile);

               }

 

           IDxFileReference[] xrefFiles = files.XrefFiles;

           foreach (DxFileReference xref in xrefFiles)

               {

               ed.WriteMessage("\nXref DrawingFile :{0}", xref);

              }

            /*Write data to CSV*/

           if (extractionSettings.DrawingDataExtractor.ExtractData(dxePath))

               {

               System.Data.DataTable dt = extractionSettings.DrawingDataExtractor.ExtractedData;

 

               foreach (var col in dt.Columns)

                   {

                   fileContent.Append(col.ToString() + ",");

                   }

 

               fileContent.Replace(",", System.Environment.NewLine, fileContent.Length - 1, 1);

                foreach (DataRow dr in dt.Rows)

                   {

                    foreach (var column in dr.ItemArray)

                       {

                       fileContent.Append("\"" + column.ToString() + "\",");

                       }

 

                   fileContent.Replace(",", System.Environment.NewLine, fileContent.Length - 1, 1);

                   }

               if(File.Exists(@"C:\MLeaders.csv"))

                   File.Delete(@"C:\MLeaders.csv");

               System.IO.File.WriteAllText(@"C:\MLeaders.csv", fileContent.ToString());

               }

 

            /*Some Other Information*/

           //IDxOutputSettings outPutSettings = extractionSettings.OutputSettings;

           //AdoOutput.OutputType outPutType =  outPutSettings.FileOutputType;

 

           //DxOuputFlags oFlags = outPutSettings.OuputFlags;

           //IDxReport report  =  extractionSettings.Report;

 

            }

        }

 

Sample screen of excel sheet with data written to it

Changing Display Resolution Settings Through API

By Madhukar Moogala

We can set all the four settings mentioned under Display Resolution box in Options.

Before setting them through API, we will understand what each variable does.

VIEWRES: Arc and circle smoothness, this sets the resolution for objects in the viewport.

SPLINESEGS: Segments in a polyline curve, this sets number of line segments to be generated for each spline-fit polyline generated by the spline objects of the PEDIT command.

FACETRES: Rendered object smoothness, adjusts the smoothness of shaded and rendered objects  and objects with hidden lines removed.

ISOLINES: Contour lines per surface, specifies the number of contour lines displayed on the curved surface of 3D solids.

void changeDispRes()

  {

  AcDbDatabase *pDb = acdbHostApplicationServices()->workingDatabase();

  acutPrintf(_T("\n current SPLINESEGS value %d"),pDb->splinesegs());

  acutPrintf(_T("\n current FACETRES value %d"),pDb->facetres());

  acutPrintf(_T("\n current ISOLINES value %d"),pDb->isolines());

  pDb->setSplinesegs(8);pDb->setFacetres(0.75);pDb->setIsolines(6);

  AcDbObjectId curVportId = AcDbObjectId::kNull;

  curVportId = acedActiveViewportId();

  AcDbObjectPointer<AcDbViewportTableRecord> curVTR (curVportId,AcDb::kForWrite);

    if(curVTR.openStatus() == Acad::eOk)

      {

      acutPrintf(_T("\n current VIEWRES value %d"),curVTR->circleSides());

 

      curVTR->setCircleSides(100);

      }

  }