Translating between drawing point and geographic location using ObjectARX

Feb 4, 2015

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<?xml encoding=”UTF-8″>By Balaji Ramamoorthy

Here is a code snippet to convert drawing point to a geo-location and vice-versa in a geo-located drawing. If you are looking for a .Net code sample, please refer to this blog post.

 Acad::ErrorStatus es;

 AcDbDatabase *pDb =

 acdbHostApplicationServices()->workingDatabase();

 AcDbObjectId geodataId = AcDbObjectId::kNull;

 acdbGetGeoDataObjId(pDb, geodataId);

 <span>if</span><span> (geodataId.isNull() == Adesk::kFalse)</span>

 <span>{</span>

     AcDbTransactionManager *pTM

                     = pDb->transactionManager();

 	AcTransaction *pTransaction

                         = pTM->startTransaction();

 	AcDbObject *pObj = NULL;

 	pTransaction->getObject(pObj,

                             geodataId,

                             AcDb::kForRead);

 	AcDbGeoData *pGeoData = AcDbGeoData::cast(pObj);

 	<span>if</span><span> (pGeoData != NULL)</span>

 	<span>{</span>

 	    pGeoData->upgradeOpen();

         <span>// convert from drawing point to Geolocation</span><span> </span>

         AcGePoint3d geoPoint(dblLongitude,

                              dblLatitude,

                              dblAltitude);

         AcGePoint3d drawingPt = AcGePoint3d::kOrigin;

         es = pGeoData->transformFromLonLatAlt(

                             geoPoint, drawingPt);

         <span>// convert from Geolocation to drawing point</span><span> </span>

         es = pGeoData->transformToLonLatAlt(

                 dblDwgX, dblDwgY, dblDwgZ,

                 dblLongitude, dblLatitude, dblAltitude);

 		pTM->endTransaction();

 	<span>}</span>

 	<span>else</span><span> </span>

 		pTM->abortTransaction();

 <span>}</span>

Comments

2 responses to “Translating between drawing point and geographic location using ObjectARX”

sandesh

February 11, 2015

Thanks for posting this code. I was just looking for some training material like this.

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Neyton Luiz Dalle Molle

September 26, 2015

Hi,
I’m a Civil 3D user and I’m trying to implement this code to convert local coordinates (x,y) to UTM grid coordinates (north, east):
Dim gd As GeoLocationData = DB.GeoDataObject.GetObject(OpenMode.ForRead)
Dim m As Matrix3d = Matrix3d.Displacement(gd.DesignPoint.GetVectorTo(gd.ReferencePoint))
m = m * Matrix3d.Rotation(gd.NorthDirection, gd.UpDirection, gd.DesignPoint)
m = m * Matrix3d.Scaling(gd.ScaleFactor, gd.DesignPoint)
Dim ptUTM as Point3d = ptLOCAL.TransformBy(m)
But, gd.ScaleFactor always return 1, even if gd.ScaleEstimationMethod = ScaleEstimationMethod.ScaleEstMethodReferencePoint
Note: Civil 3D return correct value:
Autodesk.Civil.ApplicationServices.CivilApplication.ActiveDocument.Settings.DrawingSettings.TransformationSettings.GridScaleFactor
What is wrong? Did I miss something?

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Translating between drawing point and geographic location using ObjectARX

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