public void UpdateAerial()
{
Document doc = Application.DocumentManager.MdiActiveDocument;
if (doc == null)
{
return;
}
Editor ed = doc.Editor;
// Select an aerial entity to update
PromptEntityResult entityResult = ed.GetEntity("Pick an aerial to update : ");
if (entityResult.Status == PromptStatus.OK)
{
// Create a new transaction to contain the update
Transaction tx = doc.TransactionManager.StartTransaction();
try
{
// Get the aerial entity object and try to read its extension dictionary
RasterImage aerialEnt = tx.GetObject(entityResult.ObjectId, OpenMode.ForRead) as RasterImage;
if (aerialEnt.ExtensionDictionary.IsNull)
{
throw new Exception(ErrorStatus.InvalidInput, "Unrecognized aerial image.");
}
// Get the extension dictionary object
DBDictionary extDict = tx.GetObject(aerialEnt.ExtensionDictionary, OpenMode.ForRead) as DBDictionary;
if (!extDict.Contains("ImageData"))
{
throw new Exception(ErrorStatus.InvalidInput, "Unrecognized aerial image.");
}
// Get the associated image data
ObjectId boundsEntryId = extDict.GetAt("ImageData");
Xrecord boundsRecord = tx.GetObject(boundsEntryId, OpenMode.ForRead) as Xrecord;
TypedValue[] resBuff = boundsRecord.Data.AsArray();
GeoPoint center = new GeoPoint((resBuff[0].Value as double?).Value, (resBuff[1].Value as double?).Value);
GeoPoint neCorner = new GeoPoint((resBuff[2].Value as double?).Value, (resBuff[3].Value as double?).Value);
GeoPoint swCorner = new GeoPoint((resBuff[4].Value as double?).Value, (resBuff[5].Value as double?).Value);
int zoom = (resBuff[6].Value as int?).Value;
int mapTypeInt = (resBuff[7].Value as int?).Value;
int mapSourceInt = (resBuff[8].Value as int?).Value;
MapType mapType = (MapType)mapTypeInt;
AerialRepository repository;
if (mapSourceInt == 0)
{
repository = new BingAerialRepository();
}
else
{
repository = new GoogleMapsAerialRepository();
}
// Get the current filename using the aerial's RasterImageDef
ObjectId aerialImgDefId = aerialEnt.ImageDefId;
RasterImageDef aerialImgDef = tx.GetObject(aerialImgDefId, OpenMode.ForRead) as RasterImageDef;
string filename = aerialImgDef.SourceFileName;
// Get the image width and height
int width = (int)aerialImgDef.Size.X;
int height = (int)aerialImgDef.Size.Y;
// Get the request details for the image downlaod
AerialImageData imageData = new AerialImageData(center, neCorner,
swCorner, width, height, zoom, mapType, filename);
string requestUrl = repository.BuildImageRequestUrl(imageData, update: true);
// Delete the current entity
aerialImgDef.UpgradeOpen();
aerialImgDef.Unload(true);
// Download the new aerial photo to replace the old
AerialRepository.DownloadImage(requestUrl, filename);
// Reload the image entity
aerialImgDef.Load();
// Commit the transaction
tx.Commit();
} catch (Exception ex)
{
ed.WriteMessage("Error updating aerial: " + ex.Message + '\n');
ed.WriteMessage("Please try again.\n");
} finally
{
tx.Dispose();
}
}
}