//----------------------------------------------------------------------------
//  EgalTech 2014-2014
//----------------------------------------------------------------------------
// File : ExportDxf.cpp       Data : 07.08.14         Versione : 1.5h2
// Contenuto : Implementazione della classe per l'esportazione in formato DXF.
//             Versione ACAD 1009 quindi DXF R12 (handles disabilitati).
//
//
// Modifiche : 07.08.14 DS Creazione modulo.
//
//
//----------------------------------------------------------------------------

//--------------------------- Include ----------------------------------------
#include "stdafx.h"
#include "ExportDxf.h"
#include "DxfConst.h"
#include "DxfColors.h"
#include "DllMain.h"
#include "/EgtDev/Include/EExDllMain.h"
#include "/EgtDev/Include/EGkGeomDB.h"
#include "/EgtDev/Include/EGkGdbIterator.h"
#include "/EgtDev/Include/EGkGeoPoint3d.h"
#include "/EgtDev/Include/EGkGeoVector3d.h"
#include "/EgtDev/Include/EGkCurveLine.h"
#include "/EgtDev/Include/EGkCurveArc.h"
#include "/EgtDev/Include/EGkCurveBezier.h"
#include "/EgtDev/Include/EGkCurveComposite.h"
#include "/EgtDev/Include/EGkCurveAux.h"
#include "/EgtDev/Include/EGkSurfFlatRegion.h"
#include "/EgtDev/Include/EGkSurfTriMesh.h"
#include "/EgtDev/Include/EGkExtText.h"
#include "/EgtDev/Include/EGkStringUtils3d.h"
#include "/EgtDev/Include/EGnStringUtils.h"
#include "/EgtDev/Include/EGnFileUtils.h"
#include "/EgtDev/Include/SELkKeyProc.h"
#include "/EgtDev/Include/EgtKeyCodes.h"
#include "/EgtDev/Include/EgtStringConverter.h"
#include "/EgtDev/Include/EgtStringDecoder.h"
#include "/EgtDev/Include/EgtPointerOwner.h"

using namespace std ;

//----------------------------------------------------------------------------
IExportDxf*
CreateExportDxf( void)
{
  // verifico la chiave e le opzioni
   if ( ! VerifyKey( KEYOPT_EEX_EXPBASE))
      return nullptr ;
  // creo l'oggetto
   return static_cast<IExportDxf*> ( new(nothrow) ExportDxf) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::SetOptions( int nFilter, int nFlag)
{
   m_nFilter = nFilter ;
   m_bCompoundLayer = (( nFlag & EEXFLAG_COMP_LAYER) != 0) ;
   m_bColorByLayer = (( nFlag & EEXFLAG_COL_BY_LAYER) != 0) ;
   m_bAdvancedNames = (( nFlag & EEXFLAG_ADV_NAMES) != 0) ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::Export( IGeomDB* pGDB, int nId, const string& sFile)
{
  // verifico il DB geometrico
   if ( pGDB == nullptr) {
      LOG_ERROR( GetEExLogger(), "ExportDxf : Error on GeomDB")
      return false ;
   }

  // verifico l'Id dell'oggetto da esportare
   if ( ! pGDB->ExistsObj( nId)) {
      LOG_ERROR( GetEExLogger(), "ExportDxf : Error on Id")
      return false ;
   }

  // apro il file di testo in scrittura
   m_Writer.Close() ;
   if ( ! m_Writer.Init( sFile)) {
      LOG_ERROR( GetEExLogger(), "ExportDxf : Error on open file")
      return false ;
   }

   bool bOk = true ;

  // scrivo la sezione di intestazione
   if ( ! ExportHeader( pGDB, nId))
      bOk = false ;

  // scrivo la sezione tavole
   if ( ! ExportTables( pGDB, nId))
      bOk = false ;

  // scrivo la sezione blocchi
   if ( ! ExportBlocks( pGDB, nId))
      bOk = false ;

  // scrivo la sezione entità
   if ( ! ExportEntities( pGDB, nId))
      bOk = false ;

  // terminazione file
   if ( ! WriteItem( 0, "EOF"))
      bOk = false ;

  // chiudo il file
   if ( ! m_Writer.Close())
      bOk = false ;

   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportHeader( IGeomDB* pGDB, int nId)
{
  // intestazione sezione header
   if ( ! WriteItem( 0, "SECTION")  ||
        ! WriteItem( 2, "HEADER"))
      return false ;

  // versione DXF
   if ( ! WriteItem( 9, "$ACADVER")  ||
        ! WriteItem( 1, "AC1009"))
      return false ;

  // altri dati
   if ( ! WriteItem( 9, "$DWGCODEPAGE")  ||
        ! WriteItem( 3, "ansi_1252")  ||
        ! WriteItem( 9, "$INSBASE")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0"))
      return false ;

  // estensione
   BBox3d b3Glob ;
   if ( ! pGDB->GetGlobalBBox( nId, b3Glob))
      return false ;
   if ( ! WriteItem( 9, "$EXTMIN")  ||
        ! WriteItem( 10, b3Glob.GetMin().x)  ||
        ! WriteItem( 20, b3Glob.GetMin().y)  ||
        ! WriteItem( 30, b3Glob.GetMin().z))
      return false ;
   if ( ! WriteItem( 9, "$EXTMAX")  ||
        ! WriteItem( 10, b3Glob.GetMax().x)  ||
        ! WriteItem( 20, b3Glob.GetMax().y)  ||
        ! WriteItem( 30, b3Glob.GetMax().z))
      return false ;

  // altri dati
   if ( ! WriteItem( 9, "$LIMMIN")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 9, "$LIMMAX")  ||
        ! WriteItem( 10, "12.0")  ||
        ! WriteItem( 20, "9.0")  ||
        ! WriteItem( 9, "$ORTHOMODE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$REGENMODE")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$FILLMODE")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$QTEXTMODE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$MIRRTEXT")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$DRAGMODE")  ||
        ! WriteItem( 70, "2")  ||
        ! WriteItem( 9, "$LTSCALE")  ||
        ! WriteItem( 40, "1.0")  ||
        ! WriteItem( 9, "$OSMODE")  ||
        ! WriteItem( 70, "37")  ||
        ! WriteItem( 9, "$ATTMODE")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$TEXTSIZE")  ||
        ! WriteItem( 40, "10.0")  ||
        ! WriteItem( 9, "$TRACEWID")  ||
        ! WriteItem( 40, "0.05")  ||
        ! WriteItem( 9, "$TEXTSTYLE")  ||
        ! WriteItem( 7, "STANDARD")  ||
        ! WriteItem( 9, "$CLAYER")  ||
        ! WriteItem( 8, "0")  ||
        ! WriteItem( 9, "$CELTYPE")  ||
        ! WriteItem( 6, "BYBLOCK")  ||
        ! WriteItem( 9, "$CECOLOR")  ||
        ! WriteItem( 62, "256")  ||
        ! WriteItem( 9, "$DIMSCALE")  ||
        ! WriteItem( 40, "1.0")  ||
        ! WriteItem( 9, "$DIMASZ")  ||
        ! WriteItem( 40, "0.18")  ||
        ! WriteItem( 9, "$DIMEXO")  ||
        ! WriteItem( 40, "0.0625")  ||
        ! WriteItem( 9, "$DIMDLI")  ||
        ! WriteItem( 40, "0.38")  ||
        ! WriteItem( 9, "$DIMRND")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMDLE")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMEXE")  ||
        ! WriteItem( 40, "0.18")  ||
        ! WriteItem( 9, "$DIMTP")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMTM")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMTXT")  ||
        ! WriteItem( 40, "0.18")  ||
        ! WriteItem( 9, "$DIMCEN")  ||
        ! WriteItem( 40, "0.09")  ||
        ! WriteItem( 9, "$DIMTSZ")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMTOL")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMLIM")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMTIH")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$DIMTOH")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$DIMSE1")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMSE2")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMTAD")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMZIN")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMBLK")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 9, "$DIMASO")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$DIMSHO")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$DIMPOST")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 9, "$DIMAPOST")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 9, "$DIMALT")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMALTD")  ||
        ! WriteItem( 70, "2")  ||
        ! WriteItem( 9, "$DIMALTF")  ||
        ! WriteItem( 40, "25.4")  ||
        ! WriteItem( 9, "$DIMLFAC")  ||
        ! WriteItem( 40, "1.0")  ||
        ! WriteItem( 9, "$DIMTOFL")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMTVP")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$DIMTIX")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMSOXD")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMSAH")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMBLK1")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 9, "$DIMBLK2")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 9, "$DIMSTYLE")  ||
        ! WriteItem( 2, "STANDARD")  ||
        ! WriteItem( 9, "$DIMCLRD")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMCLRE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMCLRT")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$DIMTFAC")  ||
        ! WriteItem( 40, "1.0")  ||
        ! WriteItem( 9, "$DIMGAP")  ||
        ! WriteItem( 40, "0.09")  ||
        ! WriteItem( 9, "$LUNITS")  ||
        ! WriteItem( 70, "2")  ||
        ! WriteItem( 9, "$LUPREC")  ||
        ! WriteItem( 70, "4")  ||
        ! WriteItem( 9, "$SKETCHINC")  ||
        ! WriteItem( 40, "0.1")  ||
        ! WriteItem( 9, "$FILLETRAD")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$AUNITS")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$AUPREC")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$MENU")  ||
        ! WriteItem( 1, ".")  ||
        ! WriteItem( 9, "$ELEVATION")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$PELEVATION")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$THICKNESS")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$LIMCHECK")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$CHAMFERA")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$CHAMFERB")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$SKPOLY")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$TDCREATE")  ||
        ! WriteItem( 40, "2459110.411952581")  ||
        ! WriteItem( 9, "$TDUPDATE")  ||
        ! WriteItem( 40, "2459110.411952651")  ||
        ! WriteItem( 9, "$TDINDWG")  ||
        ! WriteItem( 40, "0.0000000116")  ||
        ! WriteItem( 9, "$TDUSRTIMER")  ||
        ! WriteItem( 40, "0.0000000116")  ||
        ! WriteItem( 9, "$USRTIMER")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$ANGBASE")  ||
        ! WriteItem( 50, "0.0")  ||
        ! WriteItem( 9, "$ANGDIR")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$PDMODE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$PDSIZE")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$PLINEWID")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$COORDS")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$SPLFRAME")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$SPLINETYPE")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$SPLINESEGS")  ||
        ! WriteItem( 70, "8")  ||
        ! WriteItem( 9, "$ATTDIA")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$ATTREQ")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$HANDLING")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$HANDSEED")  ||
        ! WriteItem( 5, "0")  ||
        ! WriteItem( 9, "$SURFTAB1")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$SURFTAB2")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$SURFTYPE")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$SURFU")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$SURFV")  ||
        ! WriteItem( 70, "6")  ||
        ! WriteItem( 9, "$UCSNAME")  ||
        ! WriteItem( 2, "")  ||
        ! WriteItem( 9, "$UCSORG")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$UCSXDIR")  ||
        ! WriteItem( 10, "1.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$UCSYDIR")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "1.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$PUCSNAME")  ||
        ! WriteItem( 2, "")  ||
        ! WriteItem( 9, "$PUCSORG")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$PUCSXDIR")  ||
        ! WriteItem( 10, "1.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$PUCSYDIR")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "1.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 9, "$USERI1")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$USERI2")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$USERI3")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$USERI4")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$USERI5")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$USERR1")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$USERR2")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$USERR3")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$USERR4")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$USERR5")  ||
        ! WriteItem( 40, "0.0")  ||
        ! WriteItem( 9, "$WORLDVIEW")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$SHADEDGE")  ||
        ! WriteItem( 70, "3")  ||
        ! WriteItem( 9, "$SHADEDIF")  ||
        ! WriteItem( 70, "70")  ||
        ! WriteItem( 9, "$TILEMODE")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$MAXACTVP")  ||
        ! WriteItem( 70, "64")  ||
        ! WriteItem( 9, "$PLIMCHECK")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$PEXTMIN")  ||
        ! WriteItem( 10, "1.000000000000000E+20")  ||
        ! WriteItem( 20, "1.000000000000000E+20")  ||
        ! WriteItem( 30, "1.000000000000000E+20")  ||
        ! WriteItem( 9, "$PEXTMAX")  ||
        ! WriteItem( 10, "-1.000000000000000E+20")  ||
        ! WriteItem( 20, "-1.000000000000000E+20")  ||
        ! WriteItem( 30, "-1.000000000000000E+20")  ||
        ! WriteItem( 9, "$PLIMMIN")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 9, "$PLIMMAX")  ||
        ! WriteItem( 10, "12.0")  ||
        ! WriteItem( 20, "9.0")  ||
        ! WriteItem( 9, "$UNITMODE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$VISRETAIN")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 9, "$PLINEGEN")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 9, "$PSLTSCALE")  ||
        ! WriteItem( 70, "1")
      )
      return false ;

  // terminazione sezione header
   if ( ! WriteItem( 0, "ENDSEC"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportTables( IGeomDB* pGDB, int nId)
{
  // intestazione sezione tables
   if ( ! WriteItem( 0, "SECTION")  ||
        ! WriteItem( 2, "TABLES"))
      return false ;

  // scrittura tavola per VPORT
   if ( ! WriteVPortTable( pGDB, nId))
      return false ;

  // scrittura tavola per tipi di linea
   if ( ! WriteLinetypesTable( pGDB, nId))
      return false ;

  // scrittura tavola per i layers
   if ( ! WriteLayersTable( pGDB, nId))
      return false ;

  // scrittura tavola per stili di testo
   if ( ! WriteStylesTable( pGDB, nId))
      return false ;

  // scrittura tavole varie
   if ( ! WriteOtherTables( pGDB, nId))
      return false ;

  // terminazione sezione tables
   if ( ! WriteItem( 0, "ENDSEC"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteVPortTable( IGeomDB* pGDB, int nId)
{
  // scrittura intestazione della tavola
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "VPORT"))
      return false ;
  // dati
   if ( ! WriteItem( 70, "1")  ||
        ! WriteItem( 0, "VPORT")  ||
        ! WriteItem( 2, "*ACTIVE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 11, "1.0")  ||
        ! WriteItem( 21, "1.0")  ||
        ! WriteItem( 12, "10.42990654205607")  ||
        ! WriteItem( 22, "4.5")  ||
        ! WriteItem( 13, "0.0")  ||
        ! WriteItem( 23, "0.0")  ||
        ! WriteItem( 14, "0.5")  ||
        ! WriteItem( 24, "0.5")  ||
        ! WriteItem( 15, "0.5")  ||
        ! WriteItem( 25, "0.5")  ||
        ! WriteItem( 16, "0.0")  ||
        ! WriteItem( 26, "0.0")  ||
        ! WriteItem( 36, "1.0")  ||
        ! WriteItem( 17, "0.0")  ||
        ! WriteItem( 27, "0.0")  ||
        ! WriteItem( 37, "0.0")  ||
        ! WriteItem( 40, "9.0")  ||
        ! WriteItem( 41, "1.972972972850329")  ||
        ! WriteItem( 42, "50.0")  ||
        ! WriteItem( 43, "0.0")  ||
        ! WriteItem( 44, "0.0")  ||
        ! WriteItem( 50, "0.0")  ||
        ! WriteItem( 51, "0.0")  ||
        ! WriteItem( 71, "0")  ||
        ! WriteItem( 72, "100")  ||
        ! WriteItem( 73, "1")  ||
        ! WriteItem( 74, "3")  ||
        ! WriteItem( 75, "0")  ||
        ! WriteItem( 76, "0")  ||
        ! WriteItem( 77, "0")  ||
        ! WriteItem( 78, "0"))
     return false ;
  // scrittura terminazione della tavola
   if ( ! WriteItem( 0, "ENDTAB"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteLinetypesTable( IGeomDB* pGDB, int nId)
{
  // scrittura intestazione della tavola
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "LTYPE"))
      return false ;
  // un solo tipo di linea
   if ( ! WriteItem( 70, 1))
      return false ;
  // tipo di linea continuo
   if ( ! WriteItem( 0, "LTYPE"))
      return false ;
   if ( ! WriteItem( 2, "CONTINUOUS"))
      return false ;
   if ( ! WriteItem( 70, 0))
      return false ;
   if ( ! WriteItem( 3, "Solid line"))
      return false ;
   if ( ! WriteItem( 72, 65))
      return false ;
   if ( ! WriteItem( 73, 0))
      return false ;
   if ( ! WriteItem( 40, 0.0))
      return false ;
  // scrittura terminazione della tavola
   if ( ! WriteItem( 0, "ENDTAB"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteLayersTable( IGeomDB* pGDB, int nId)
{
  // ciclo di ricerca dei layer
   // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator( pGDB)) ;
   if ( IsNull( pIter))
      return false ;
   pIter->GoTo( nId) ;
   // eseguo la ricerca
   LAYDATVECTOR vLayDat ;
   if ( ! FindLayers( *pIter, LAY_DEFAULT, vLayDat))
      return false ;

  // scrittura intestazione della tavola
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "LAYER"))
      return false ;
  // numero di layer
   int nLayNbr = int( vLayDat.size()) ;
   if ( ! WriteItem( 70, nLayNbr))
      return false ;
  // scrittura dei layers
   for ( int i = 0 ; i < nLayNbr ; ++i) {
      if ( ! WriteLayer( vLayDat[i].first, 0, vLayDat[i].second, LINETYPE_DEFAULT))
         return false ;
   }
  // scrittura terminazione della tavola
   if ( ! WriteItem( 0, "ENDTAB"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::FindLayers( const IGdbIterator& iIter, const string& sLay, LAYDATVECTOR& vLayDat)
{
  // se non è un gruppo, esco subito
   if ( iIter.GetGdbType() != GDB_TY_GROUP)
      return true ;

  // recupero il livello dell'oggetto
   int nLev = GDB_LV_USER ;
   iIter.GetCalcLevel( nLev) ;
  // recupero il modo dell'oggetto
   int nMode = GDB_MD_STD ;
   iIter.GetCalcMode( nMode) ;
  // recupero lo stato dell'oggetto
   int nStat = GDB_ST_ON ;
   iIter.GetCalcStatus( nStat) ;
  // se il filtro non lo abilita, esco subito 
   if ( ! TestFilter( nLev, nMode, nStat))
      return true ;

  // aggiorno nome layer
   bool bExactLay ;
   string sNewLay = UpdateLayerName( iIter, sLay, &bExactLay) ;
  // recupero il colore corrente
   Color cCol ;
   int nCol ;
   if ( iIter.GetCalcMaterial( cCol))
      ColorToACI( cCol, nCol) ;
  // se layer non presente, lo aggiungo al vettore dei layer
   bool bFound = false ;
   for ( int i = 0 ; ! bFound && i < int( vLayDat.size()) ; ++ i) {
      string s1 = vLayDat[i].first ;
      string s2 = sNewLay ;
      if ( ToUpper( s1) == ToUpper( s2)) {
         bFound = true ;
        // se è il nome esatto, aggiorno il colore
         if ( bExactLay)
            vLayDat[i].second = nCol ;
      }
   }
   if ( ! bFound)
      vLayDat.emplace_back( sNewLay, nCol) ;
  // scandisco il gruppo alla ricerca di sottogruppi
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator( iIter.GetGDB())) ;
   if ( IsNull( pIter))
      return false ;
   bool bOk = true ;
   for ( bool bNext = pIter->GoToFirstInGroup( iIter) ;
         bNext ;
         bNext = pIter->GoToNext()) {
      if ( ! FindLayers( *pIter, sNewLay, vLayDat))
         bOk = false ;
   }
   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteLayer( const string& sLay, int nFlag, int nCol, const string& sLineType)
{
  // intestazione layer
   if ( ! WriteItem( 0, "LAYER"))
      return false ;
  // nome layer
   if ( ! WriteItem( 2, sLay))
      return false ;
  // flag
   if ( ! WriteItem( 70, nFlag))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // tipo linea
   if ( ! WriteItem( 6, sLineType))
      return false ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteStylesTable( IGeomDB* pGDB, int nId)
{
  // ciclo di ricerca dei testi
   // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator( pGDB)) ;
   if ( IsNull( pIter))
      return false ;
   pIter->GoTo( nId) ;
   // eseguo la ricerca
   STRVECTOR vFontName ;
   if ( ! FindTextStyles( *pIter, vFontName))
      return false ;

  // scrittura intestazione della tavola
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "STYLE"))
      return false ;
  // numero di stili di testo
   //int nFontNbr = int( vFontName.size()) ;
   //if ( ! WriteItem( 70, 1 + nFontNbr))
   if ( ! WriteItem( 70, 1))
      return false ;
  // scrittura stile di testo standard
   if ( ! WriteStyle( "STANDARD", "isocp.shx"))
      return false ;
  // scrittura degli stili di testo
   //for ( int i = 0 ; i < nFontNbr ; ++i) {
   //   if ( ! WriteStyle( FontNameToStyle( vFontName[i]), AdjustFontName( vFontName[i])))
   //      return false ;
   //}
  // scrittura terminazione della tavola
   if ( ! WriteItem( 0, "ENDTAB"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::FindTextStyles( const IGdbIterator& iIter, STRVECTOR& vFontName)
{
  // se è una entità geometrica
   if ( iIter.GetGdbType() == GDB_TY_GEO) {
     // se è un testo
      if ( const IExtText* pTXT = GetExtText( iIter.GetGeoObj())) {
        // se font non presente, lo aggiungo al vettore dei font
         bool bFound = false ;
         for ( int i = 0 ; ! bFound && i < int( vFontName.size()) ; ++ i) {
            string s1 = vFontName[i] ;
            string s2 = pTXT->GetFont() ;
            if ( ToUpper( s1) == ToUpper( s2))
               bFound = true ;
         }
         if ( ! bFound)
            vFontName.push_back( pTXT->GetFont()) ;
      }
      return true ;
   }

  // se un gruppo, scandisco i suoi figli
   else if ( iIter.GetGdbType() == GDB_TY_GROUP) {
     // scandisco il gruppo
      PtrOwner<IGdbIterator> pIter( CreateGdbIterator( iIter.GetGDB())) ;
      if ( IsNull( pIter))
         return false ;
      bool bOk = true ;
      for ( bool bNext = pIter->GoToFirstInGroup( iIter) ;
            bNext ;
            bNext = pIter->GoToNext()) {
         if ( ! FindTextStyles( *pIter, vFontName))
            bOk = false ;
      }
      return bOk ;
   }
   else
      return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteStyle( const string& sStyle, const string& sFont)
{
  // intestazione layer
   if ( ! WriteItem( 0, "STYLE"))
      return false ;
  // nome stile
   if ( ! WriteItem( 2, sStyle))
      return false ;
  // flag
   if ( ! WriteItem( 70, 0))
      return false ;
  // altezza testo
   if ( ! WriteItem( 40, 0))
      return false ;
  // rapporto altezza/larghezza
   if ( ! WriteItem( 41, 1))
      return false ;
  // angolo obliquo
   if ( ! WriteItem( 50, 0))
      return false ;
  // flag di generazione
   if ( ! WriteItem( 71, 0))
      return false ;
  // ultima altezza usata
   if ( ! WriteItem( 42, 10))
      return false ;
  // nome font
   if ( ! WriteItem( 3, sFont))
      return false ;
  // big font file name
   if ( ! WriteItem( 4, ""))
      return false ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteOtherTables( IGeomDB* pGDB, int nId)
{
  // tavola VIEW
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "VIEW")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 0, "ENDTAB"))
      return false ;
  // tavola UCS
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "UCS")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 0, "ENDTAB"))
      return false ;
  // tavola APPID/ACAD
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "APPID")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 0, "APPID")  ||
        ! WriteItem( 2, "ACAD")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 0, "ENDTAB"))
      return false ;
  // tavola DIMSTYLE
   if ( ! WriteItem( 0, "TABLE")  ||
        ! WriteItem( 2, "DIMSTYLE")  ||
        ! WriteItem( 70, "1")  ||
        ! WriteItem( 0, "DIMSTYLE")  ||
        ! WriteItem( 2, "STANDARD")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 3, "")  ||
        ! WriteItem( 4, "")  ||
        ! WriteItem( 5, "")  ||
        ! WriteItem( 6, "")  ||
        ! WriteItem( 7, "")  ||
        ! WriteItem( 40, "1.0")  ||
        ! WriteItem( 41, "0.18")  ||
        ! WriteItem( 42, "0.0625")  ||
        ! WriteItem( 43, "0.38")  ||
        ! WriteItem( 44, "0.18")  ||
        ! WriteItem( 45, "0.0")  ||
        ! WriteItem( 46, "0.0")  ||
        ! WriteItem( 47, "0.0")  ||
        ! WriteItem( 48, "0.0")  ||
        ! WriteItem( 140, "0.18")  ||
        ! WriteItem( 141, "0.09")  ||
        ! WriteItem( 142, "0.0")  ||
        ! WriteItem( 143, "25.4")  ||
        ! WriteItem( 144, "1.0")  ||
        ! WriteItem( 145, "0.0")  ||
        ! WriteItem( 146, "1.0")  ||
        ! WriteItem( 147, "0.09")  ||
        ! WriteItem( 71, "0")  ||
        ! WriteItem( 72, "0")  ||
        ! WriteItem( 73, "1")  ||
        ! WriteItem( 74, "1")  ||
        ! WriteItem( 75, "0")  ||
        ! WriteItem( 76, "0")  ||
        ! WriteItem( 77, "0")  ||
        ! WriteItem( 78, "0")  ||
        ! WriteItem( 170, "0")  ||
        ! WriteItem( 171, "2")  ||
        ! WriteItem( 172, "0")  ||
        ! WriteItem( 173, "0")  ||
        ! WriteItem( 174, "0")  ||
        ! WriteItem( 175, "0")  ||
        ! WriteItem( 176, "0")  ||
        ! WriteItem( 177, "0")  ||
        ! WriteItem( 178, "0")  ||
        ! WriteItem( 0, "ENDTAB"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportBlocks( IGeomDB* pGDB, int nId)
{
  // intestazione sezione blocks
   if ( ! WriteItem( 0, "SECTION")  ||
        ! WriteItem( 2, "BLOCKS"))
      return false ;

  // blocco ModelSpace
   if ( ! WriteItem( 0, "BLOCK")  ||
        ! WriteItem( 8, "0")  ||
        ! WriteItem( 2, "$MODEL_SPACE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 3, "$MODEL_SPACE")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 0, "ENDBLK"))
      return false ;

  // blocco PaperSpace
   if ( ! WriteItem( 0, "BLOCK")  ||
        ! WriteItem( 67, "1")  ||
        ! WriteItem( 8, "0")  ||
        ! WriteItem( 2, "$PAPER_SPACE")  ||
        ! WriteItem( 70, "0")  ||
        ! WriteItem( 10, "0.0")  ||
        ! WriteItem( 20, "0.0")  ||
        ! WriteItem( 30, "0.0")  ||
        ! WriteItem( 3, "$PAPER_SPACE")  ||
        ! WriteItem( 1, "")  ||
        ! WriteItem( 0, "ENDBLK"))
      return false ;

  // terminazione sezione blocks
   if ( ! WriteItem( 0, "ENDSEC"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportEntities( IGeomDB* pGDB, int nId)
{
  // intestazione sezione entità
   if ( ! WriteItem( 0, "SECTION")  ||
        ! WriteItem( 2, "ENTITIES"))
      return false ;

  // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator( pGDB)) ;
   if ( IsNull( pIter))
      return false ;
   pIter->GoTo( nId) ;
  // esporto l'oggetto e i suoi eventuali figli
   if ( ! ExportGdbObject( *pIter, LAY_DEFAULT))
      return false ;

  // terminazione sezione entità
   if ( ! WriteItem( 0, "ENDSEC"))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportGdbObject( const IGdbIterator& iIter, const string& sLay)
{
  // recupero il tipo dell'oggetto
   int nGdbType = iIter.GetGdbType() ;
  // se gruppo di oggetti
   if ( nGdbType == GDB_TY_GROUP) {
     // esporto il gruppo
      return ExportGdbGroup( iIter, sLay) ;
   }
  // se oggetto geometrico
   else if ( nGdbType == GDB_TY_GEO) {
     // recupero l'oggetto geometrico
      const IGeoObj* pGeoObj = iIter.GetGeoObj() ;
      if ( pGeoObj == nullptr)
         return true ;
     // recupero il riferimento globale dell'oggetto
      Frame3d frFrame ;
      if ( ! iIter.GetGlobFrame( frFrame))
         return false ;
     // recupero il livello dell'oggetto
      int nLev = GDB_LV_USER ;
      iIter.GetCalcLevel( nLev) ;
     // recupero il modo dell'oggetto
      int nMode = GDB_MD_STD ;
      iIter.GetCalcMode( nMode) ;
     // recupero lo stato dell'oggetto
      int nStat = GDB_ST_ON ;
      iIter.GetCalcStatus( nStat) ;
     // se il filtro lo abilita 
      if ( TestFilter( nLev, nMode, nStat)) {
        // recupero colore (trasformato in formato ACI)
         int nCol = COL_DEFAULT ;
         Color cCol ;
         if ( ( m_bColorByLayer  &&  iIter.GetMaterial( cCol))  ||
              ( ! m_bColorByLayer  &&  iIter.GetCalcMaterial( cCol)))
            ColorToACI( cCol, nCol) ;
        // emetto l'oggetto
         switch (  pGeoObj->GetType()) {
         case GEO_PNT3D :
            if ( ! ExportPoint( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case GEO_VECT3D :
            if ( ! ExportVector( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case CRV_LINE :
            if ( ! ExportLine( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case CRV_ARC :
            if ( ! ExportArc( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case CRV_BEZIER :
            if ( ! ExportCrvBezier( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case CRV_COMPO :
            if ( ! ExportCrvCompo( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case SRF_TRIMESH :
            if ( ! ExportSTM( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case SRF_FLATRGN :
            if ( ! ExportSFR( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         case EXT_TEXT :
            if ( ! ExportText( sLay, nCol, pGeoObj, frFrame))
               return false ;
            break ;
         }
      }
      return true ;
   } 
   else
      return false ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportGdbGroup( const IGdbIterator& iIter, const string& sLay)
{
  // creo un iteratore
   PtrOwner<IGdbIterator> pIter( CreateGdbIterator( iIter.GetGDB())) ;
   if ( IsNull( pIter))
      return false ;
  // aggiorno nome layer
   string sNewLay = UpdateLayerName( iIter, sLay) ;
  // scandisco il gruppo
   bool bOk = true ;
   for ( bool bNext = pIter->GoToFirstInGroup( iIter) ;
         bNext ;
         bNext = pIter->GoToNext()) {
      if ( ! ExportGdbObject( *pIter, sNewLay))
         bOk = false ;
   }

   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportPoint( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // verifico oggetto
   const IGeoPoint3d* pGPnt = GetGeoPoint3d( pGeoObj) ;
   if ( pGPnt == nullptr)
      return false ;
  // scrittura del punto
   return WritePoint( sLay, nCol, pGPnt->GetPoint(), V_NULL, frFrame) ; 
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportVector( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // verifico oggetto
   const IGeoVector3d* pGVect = GetGeoVector3d( pGeoObj) ;
   if ( pGVect == nullptr)
      return false ;
  // scrittura del vettore con punto base
   return WritePoint( sLay, nCol, pGVect->GetBase(), pGVect->GetVector(), frFrame) ; 
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportLine( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // verifico oggetto
   const ICurveLine* pLine = GetCurveLine( pGeoObj) ;
   if ( pLine == nullptr)
      return false ;
  // scrivo l'entità
   return WriteLine( sLay, nCol, pLine, frFrame) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportArc( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // verifico oggetto
   const ICurveArc* pArc = GetCurveArc( pGeoObj) ;
   if ( pArc == nullptr)
      return false ;
  // se è un'elica o con estrusione non parallela a N
   if ( ! pArc->IsPlane()) {
     // esporto come polilinea 3d
      return WriteCurve3d( sLay, nCol, pArc, frFrame) ;
   }
  // se circonferenza
   if ( pArc->IsACircle()) {
     // esporto come cerchio
      return WriteCircle( sLay, nCol, pArc, frFrame) ;
   }
  // altrimenti arco 2d
   return WriteArc( sLay, nCol, pArc, frFrame) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportCrvBezier( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // deve essere una curva di Bezier
   const ICurveBezier* pCBez = GetCurveBezier( pGeoObj) ;
   if ( pCBez == nullptr)
      return false ;
  // verifico se piana
   Plane3d plPlane ;
   if ( pCBez->IsFlat( plPlane)) {
      Frame3d frPlane ;
      frPlane.Set( ( ORIG + plPlane.GetDist() * plPlane.GetVersN()), plPlane.GetVersN()) ;
      return WriteCurve2d( sLay, nCol, pCBez, frPlane, frFrame) ;
   }
  // esporto come polilinea 3d
   return WriteCurve3d( sLay, nCol, pCBez, frFrame) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportCrvCompo( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // deve essere una curva composita
   const ICurveComposite* pCC = GetCurveComposite( pGeoObj) ;
   if ( pCC == nullptr)
      return false ;
  // verifico se piana
   Plane3d plPlane ;
   if ( pCC->IsFlat( plPlane)) {
      Frame3d frPlane ;
      frPlane.Set( ( ORIG + plPlane.GetDist() * plPlane.GetVersN()), plPlane.GetVersN()) ;
      return WriteCurve2d( sLay, nCol, pCC, frPlane, frFrame) ;
   }
  // altrimenti esporto come polilinea 3d
   return WriteCurve3d( sLay, nCol, pCC, frFrame) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportSFR( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // deve essere una superficie regione piatta
   const ISurfFlatRegion* pSFR = GetSurfFlatRegion( pGeoObj) ;
   if ( pSFR == nullptr)
      return false ;
  // ricavo la trimesh equivalente
   const ISurfTriMesh* pStm = pSFR->GetAuxSurf() ;
   return ExportSTM( sLay, nCol, pStm, frFrame) ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportSTM( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // deve essere una superficie trimesh
   const ISurfTriMesh* pSTM = GetSurfTriMesh( pGeoObj) ;
   if ( pSTM == nullptr)
      return false ;
  // posso esportare come unica polymesh solo se il numero dei vertici e dei triangoli è inferiore a 32767
   if ( pSTM->GetVertexCount() < SHRT_MAX  &&  pSTM->GetTriangleCount() < SHRT_MAX) { 
     // identificativo entità
      if ( ! WriteItem( 0, "POLYLINE"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
     // colore
      if ( ! WriteItem( 62, nCol))
         return false ;
     // flag segnalazione entità successive dipendenti (vertex)
      if ( ! WriteItem( 66, 1))
         return false ;
     // punto inutile ma obbligatorio
      if ( ! WriteItem( 10, 0)  ||
           ! WriteItem( 20, 0)  ||
           ! WriteItem( 30, 0))
         return false ;
     // flag (polyface mesh 3d)
      if ( ! WriteItem( 70, 64))
         return false ;
     // numero di vertici
      if ( ! WriteItem( 71, pSTM->GetVertexCount()))
         return false ;
     // numero di facce
      if ( ! WriteItem( 72, pSTM->GetTriangleCount()))
         return false ;
     // ciclo sui vertici
      Point3d ptP ;
      for ( int nId = pSTM->GetFirstVertex( ptP) ;
            nId != SVT_NULL ;
            nId = pSTM->GetNextVertex( nId, ptP)) {
         ptP.ToGlob( frFrame) ;
        // entità vertice
         if ( ! WriteItem( 0, "VERTEX"))
            return false ;
        // layer
         if ( ! WriteItem( 8, sLay))
            return false ;
        // punto corrente
         if ( ! WriteItem( 10, ptP.x)  ||
              ! WriteItem( 20, ptP.y)  ||
              ! WriteItem( 30, ptP.z))
            return false ;
        // flag (3d polygon mesh + polyface mesh vertex)
         if ( ! WriteItem( 70, 64 + 128))
            return false ;
      }
     // ciclo sui triangoli
      int nIdVert[3] ;
      for ( int nId = pSTM->GetFirstTriangle( nIdVert) ;
            nId != SVT_NULL ;
            nId = pSTM->GetNextTriangle( nId, nIdVert)) {
        // entità vertice
         if ( ! WriteItem( 0, "VERTEX"))
            return false ;
        // layer
         if ( ! WriteItem( 8, sLay))
            return false ;
        // colore (unico colore riconosciuto)
         if ( ! WriteItem( 62, nCol))
            return false ;
        // punto inutile ma obbligatorio
         if ( ! WriteItem( 10, 0)  ||
              ! WriteItem( 20, 0)  ||
              ! WriteItem( 30, 0))
            return false ;
        // flag (polyface mesh vertex)
         if ( ! WriteItem( 70, 128))
            return false ;
        // indici dei vertici (1-based)
         if ( ! WriteItem( 71, nIdVert[0] + 1)  ||
              ! WriteItem( 72, nIdVert[1] + 1)  ||
              ! WriteItem( 73, nIdVert[2] + 1))
            return false ;
      }
     // entità termine dei vertici
      if ( ! WriteItem( 0, "SEQEND"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
      return true ;
   }
  // altrimenti devo esportare come insieme di facce triangolari
   else {
     // ciclo sui triangoli
      Triangle3d Tria ;
      for ( int nId = pSTM->GetFirstTriangle( Tria) ;
            nId != SVT_NULL ;
            nId = pSTM->GetNextTriangle( nId, Tria)) {
         Tria.ToGlob( frFrame) ;
        // entità 3dface
         if ( ! WriteItem( 0, "3DFACE"))
            return false ;
        // layer
         if ( ! WriteItem( 8, sLay))
            return false ;
        // colore (unico colore riconosciuto)
         if ( ! WriteItem( 62, nCol))
            return false ;
        // primo vertice
         if ( ! WriteItem( 10, Tria.GetP(0).x)  ||
              ! WriteItem( 20, Tria.GetP(0).y)  ||
              ! WriteItem( 30, Tria.GetP(0).z))
            return false ;
        // secondo vertice
         if ( ! WriteItem( 11, Tria.GetP(1).x)  ||
              ! WriteItem( 21, Tria.GetP(1).y)  ||
              ! WriteItem( 31, Tria.GetP(1).z))
            return false ;
        // terzo vertice
         if ( ! WriteItem( 12, Tria.GetP(2).x)  ||
              ! WriteItem( 22, Tria.GetP(2).y)  ||
              ! WriteItem( 32, Tria.GetP(2).z))
            return false ;
        // quarto vertice (ripete il terzo)
         if ( ! WriteItem( 13, Tria.GetP(2).x)  ||
              ! WriteItem( 23, Tria.GetP(2).y)  ||
              ! WriteItem( 33, Tria.GetP(2).z))
            return false ;
        // flag (default)
         if ( ! WriteItem( 70, 0))
            return false ;
      }
      return true ;
   }
}

//----------------------------------------------------------------------------
bool
ExportDxf::ExportText( const string& sLay, int nCol, const IGeoObj* pGeoObj, const Frame3d& frFrame)
{
  // deve essere un testo
   const IExtText* pTXT = GetExtText( pGeoObj) ;
   if ( pTXT == nullptr)
      return false ;
  // calcolo riferimento OCS
   Vector3d vtN = pTXT->GetNormVersor() ;
   vtN.ToGlob( frFrame) ;
   Frame3d frOCS ;
   frOCS.Set( ORIG, vtN) ;
  // divido il testo in testi monolinea
   IEXTTEXTPVECTOR vTxt ;
   pTXT->SplitOnLineBreak( vTxt) ;
  // ciclo sui diversi testi semplici
   bool bOk = true ;
   for ( int i = 0 ; i < int( vTxt.size()) ; ++ i) {
     // identificativo entità
      if ( ! WriteItem( 0, "TEXT"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
     // colore
      if ( ! WriteItem( 62, nCol))
         return false ;
     // punto di inserimento in OCS
      Point3d ptP = vTxt[i]->GetPoint() ;
      ptP.LocToLoc( frFrame, frOCS) ;
      if ( ! WriteItem( 10, ptP.x)  ||
           ! WriteItem( 20, ptP.y)  ||
           ! WriteItem( 30, ptP.z))
         return false ;
     // altezza
      if ( ! WriteItem( 40, vTxt[i]->GetHeight()))
         return false ;
     // stringa di testo
      string sText = vTxt[i]->GetText() ;
      if ( ! AdjustText( sText))
         return false ;
      if ( ! WriteItem( 1, sText))
         return false ;
     // angolo di rotazione
      Vector3d vtDir = vTxt[i]->GetDirVersor() ;
      vtDir.LocToLoc( frFrame, frOCS) ;
      double dDirDeg ;
      vtDir.ToSpherical( nullptr, nullptr, &dDirDeg) ;
      if ( ! WriteItem( 50, dDirDeg))
         return false ;
     // rapporto altezza/larghezza
      if ( ! WriteItem( 41, vTxt[i]->GetRatio()))
         return false ;
     // stile
      if ( ! WriteItem( 7, FontNameToStyle( vTxt[i]->GetFont())))
         return false ;
     // vettore estrusione
      if ( ! WriteItem( 210, vtN.x)  ||
           ! WriteItem( 220, vtN.y)  ||
           ! WriteItem( 230, vtN.z))
         return false ;
      // libero l'entità
       delete vTxt[i] ;
   }
   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::AdjustText( string& sText)
{
  // gestione del %
   ReplaceString( sText, "%", "%%%") ;
  // converto i byte della stringa in codici carattere
   UINTVECTOR vCode ;
   if ( ! GetCodePoints( sText, vCode))
      return false ;
  // ricostruisco la stringa dai codici
   sText.clear() ;
   for ( int i = 0 ; i < int( vCode.size()) ; ++ i) {
     // caratteri ASCII stampabili
      if ( vCode[i] >= 32  &&  vCode[i] <= 126)
         sText += string( 1, vCode[i]) ;
     // carattere speciale grado
      else if ( vCode[i] == 176)
         sText += "%%d" ;
     // carattere speciale +/-
      else if ( vCode[i] == 177)
         sText += "%%p" ;
     // carattere speciale diametro
      else if ( vCode[i] == 216)
         sText += "%%c" ;
     // altri caratteri UNICODE
      else
         sText += "_" ;
   }
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WritePoint( const string& sLay, int nCol, const Point3d& ptP, const Vector3d& vtV, const Frame3d& frFrame)
{
  // identificativo entità
   if ( ! WriteItem( 0, "POINT"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // punto
   Point3d ptOut = ptP ;
   ptOut.ToGlob( frFrame) ;
   if ( ! WriteItem( 10, ptOut.x)  ||
        ! WriteItem( 20, ptOut.y)  ||
        ! WriteItem( 30, ptOut.z))
      return false ;
  // eventuale versore estrusione e spessore
   if ( ! vtV.IsSmall()) {
      double dTh = vtV.Len() ;
      Vector3d vtExtr = vtV / dTh ;
      if ( ! WriteItem( 39, dTh)  ||
           ! WriteItem( 210, vtExtr.x)  ||
           ! WriteItem( 220, vtExtr.y)  ||
           ! WriteItem( 230, vtExtr.z))
      return false ;
   }

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteLine( const string& sLay, int nCol, const ICurveLine* pLine, const Frame3d& frFrame)
{
  // verifico validità linea
   if ( pLine == nullptr)
      return false ;
  // identificativo entità
   if ( ! WriteItem( 0, "LINE"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // punto iniziale
   Point3d ptStart = pLine->GetStart() ;
   ptStart.ToGlob( frFrame) ;
   if ( ! WriteItem( 10, ptStart.x)  ||
        ! WriteItem( 20, ptStart.y)  ||
        ! WriteItem( 30, ptStart.z))
      return false ;
  // punto finale
   Point3d ptEnd = pLine->GetEnd() ;
   ptEnd.ToGlob( frFrame) ;
   if ( ! WriteItem( 11, ptEnd.x)  ||
        ! WriteItem( 21, ptEnd.y)  ||
        ! WriteItem( 31, ptEnd.z))
      return false ;
  // spessore
   double dThick = 0 ;
   pLine->GetThickness( dThick) ;
   if ( abs( dThick) > EPS_SMALL) {
      if ( ! WriteItem( 39, dThick))
         return false ;
   }
  // vettore estrusione
   Vector3d vtExtr ;
   pLine->GetExtrusion( vtExtr) ;
   vtExtr.ToGlob( frFrame) ;
   if ( ! vtExtr.IsSmall()  &&  ! vtExtr.IsZplus()) {
      if ( ! WriteItem( 210, vtExtr.x)  ||
           ! WriteItem( 220, vtExtr.y)  ||
           ! WriteItem( 230, vtExtr.z))
         return false ;
   }

   return true ;
}
 
//----------------------------------------------------------------------------
bool
ExportDxf::WriteCircle( const string& sLay, int nCol, const ICurveArc* pArc, const Frame3d& frFrame)
{
  // verifico validità arco
   if ( pArc == nullptr)
      return false ;
  // verifico verso eventuale estrusione
   Vector3d vtN = pArc->GetNormVersor() ;
   Vector3d vtExtr ;
   pArc->GetExtrusion( vtExtr) ;
   bool bExtrOpposite = AreOppositeVectorApprox( vtN, vtExtr) ;
  // calcolo riferimento OCS
   vtN.ToGlob( frFrame) ;
   Frame3d frOCS ;
   frOCS.Set( ORIG, vtN) ;
  // identificativo entità
   if ( ! WriteItem( 0, "CIRCLE"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // centro
   Point3d ptCen = pArc->GetCenter() ;
   ptCen.LocToLoc( frFrame, frOCS) ;
   if ( ! WriteItem( 10, ptCen.x)  ||
        ! WriteItem( 20, ptCen.y)  ||
        ! WriteItem( 30, ptCen.z))
      return false ;
  // raggio
   double dRad = pArc->GetRadius() ;
   if ( ! WriteItem( 40, dRad))
      return false ;
  // spessore
   double dThick = 0 ;
   pArc->GetThickness( dThick) ;
   if ( abs( dThick) > EPS_SMALL) {
      if ( ! WriteItem( 39, ( bExtrOpposite ? - dThick : dThick)))
         return false ;
   }
  // vettore estrusione
   if ( ! WriteItem( 210, vtN.x)  ||
        ! WriteItem( 220, vtN.y)  ||
        ! WriteItem( 230, vtN.z))
      return false ;
   return true ;
}
 
//----------------------------------------------------------------------------
bool
ExportDxf::WriteArc( const string& sLay, int nCol, const ICurveArc* pArc, const Frame3d& frFrame)
{
  // verifico validità arco
   if ( pArc == nullptr)
      return false ;
  // verifico verso eventuale estrusione
   Vector3d vtN = pArc->GetNormVersor() ;
   Vector3d vtExtr ;
   pArc->GetExtrusion( vtExtr) ;
   bool bExtrOpposite = AreOppositeVectorApprox( vtN, vtExtr) ;
  // calcolo riferimento OCS
   vtN.ToGlob( frFrame) ;
   Frame3d frOCS ;
   frOCS.Set( ORIG, vtN) ;
  // identificativo entità
   if ( ! WriteItem( 0, "ARC"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // centro
   Point3d ptCen = pArc->GetCenter() ;
   ptCen.LocToLoc( frFrame, frOCS) ;
   if ( ! WriteItem( 10, ptCen.x)  ||
        ! WriteItem( 20, ptCen.y)  ||
        ! WriteItem( 30, ptCen.z))
      return false ;
  // angoli iniziale e finale (archi sempre CCW)
   double dStartAngDeg, dEndAngDeg ;
   Vector3d vtS = pArc->GetStartVersor() ;
   vtS.LocToLoc( frFrame, frOCS) ;
   vtS.ToSpherical( nullptr, nullptr, &dStartAngDeg) ;
   double dCenAngDeg = pArc->GetAngCenter() ;
   dEndAngDeg = dStartAngDeg + dCenAngDeg ;
   if ( dCenAngDeg < 0)
      swap( dStartAngDeg, dEndAngDeg) ;
   if ( ! WriteItem( 50, dStartAngDeg)  ||
        ! WriteItem( 51, dEndAngDeg))
      return false ;
  // raggio
   double dRad = pArc->GetRadius() ;
   if ( ! WriteItem( 40, dRad))
      return false ;
  // spessore
   double dThick = 0 ;
   pArc->GetThickness( dThick) ;
   if ( abs( dThick) > EPS_SMALL) {
      if ( ! WriteItem( 39, ( bExtrOpposite ? - dThick : dThick)))
         return false ;
   }
  // vettore estrusione
   if ( ! WriteItem( 210, vtN.x)  ||
        ! WriteItem( 220, vtN.y)  ||
        ! WriteItem( 230, vtN.z))
      return false ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteCurve2d( const string& sLay, int nCol, const ICurve* pCrv,
                         const Frame3d& frPlane, const Frame3d& frFrame)
{
  // verifico validità curva
   if ( pCrv == nullptr)
      return false ;
  // trasformo in poliarco
   Frame3d frGlob ;
   PolyArc PA ;
  // se il piano non coincide con il piano XY globale, devo trasformare la curva
   if ( ! AreSameFrame( frPlane, GLOB_FRM)) {
     // creo una copia della curva (da buttare alla fine)
      PtrOwner<ICurve> pModCrv( pCrv->Clone()) ;
      if ( IsNull( pModCrv))
         return false ;
     // eseguo la trasformazione
      pModCrv->ToLoc( frPlane) ;
     // esplodo in archi
      if ( ! pModCrv->ApproxWithArcs( BEZ_LIN_APPROX, BEZ_ANG_APPROX_DEG, PA))
         return false ;
     // calcolo il riferimento in cui sono espressi gli archi
      frGlob = frPlane ;
      frGlob.ToGlob( frFrame) ;
   }
  // altrimenti posso operare direttamente sulla curva originale
   else {
     // esplodo in archi
      if ( ! pCrv->ApproxWithArcs( BEZ_LIN_APPROX, BEZ_ANG_APPROX_DEG, PA))
         return false ;
     // assegno il riferimento in cui sono espressi gli archi
      frGlob = frFrame ;
   }
  // calcolo il riferimento OCS con la stessa Z del riferimento degli archi
   Frame3d frOCS ;
   frOCS.Set( ORIG, frGlob.VersZ()) ;
  // esporto come polyline 2d
   if ( ! WriteItem( 0, "POLYLINE"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
  // colore
   if ( ! WriteItem( 62, nCol))
      return false ;
  // flag segnalazione entità successive dipendenti (vertex)
   if ( ! WriteItem( 66, 1))
      return false ;
  // punto per sola elevazione : X,Y inutili Z elevazione
   Point3d ptE = ORIG ;
   ptE.LocToLoc( frGlob, frOCS) ;
   if ( ! WriteItem( 10, 0)  ||
        ! WriteItem( 20, 0)  ||
        ! WriteItem( 30, ptE.z))
      return false ;
  // flag
   bool bClosed = pCrv->IsClosed() ;
   if ( ! WriteItem( 70, ( bClosed ? 1 : 0)))
      return false ;
  // spessore
   double dThick = 0 ;
   pCrv->GetThickness( dThick) ;
   if ( abs( dThick) > EPS_SMALL) {
      if ( ! WriteItem( 39, dThick))
         return false ;
   }
  // vettore estrusione ( versore Z di OCS)
   if ( ! WriteItem( 210, frGlob.VersZ().x)  ||
        ! WriteItem( 220, frGlob.VersZ().y)  ||
        ! WriteItem( 230, frGlob.VersZ().z))
      return false ;
  // emetto i vertici
   double dBulge ;
   Point3d ptP ;
   for ( bool bPnt = PA.GetFirstPoint( ptP, dBulge) ;
         bPnt ;
         bPnt = PA.GetNextPoint( ptP, dBulge, bClosed)) {
     // entità vertice
      if ( ! WriteItem( 0, "VERTEX"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
     // punto corrente
      ptP.LocToLoc( frGlob, frOCS) ;
      if ( ! WriteItem( 10, ptP.x)  ||
           ! WriteItem( 20, ptP.y)  ||
           ! WriteItem( 30, ptP.z))
         return false ;
     // bulge
      if ( ! WriteItem( 42, dBulge))
         return false ;
     // flag
      if ( ! WriteItem( 70, 0))
         return false ;
   }
  // entità termine dei vertici
   if ( ! WriteItem( 0, "SEQEND"))
      return false ;
  // layer
   if ( ! WriteItem( 8, sLay))
      return false ;
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteCurve3d( const string& sLay, int nCol, const ICurve* pCrv, const Frame3d& frFrame)
{
  // verifico validità curva
   if ( pCrv == nullptr)
      return false ;
  // trasformo in polilinea
   PolyLine PL ;
   if ( ! pCrv->ApproxWithLines( BEZ_LIN_APPROX, BEZ_ANG_APPROX_DEG, ICurve::APL_SPECIAL, PL))
      return false ;
  // recupero lo spessore
   double dThick = 0 ;
   pCrv->GetThickness( dThick) ;
  // recupero il vettore estrusione
   Vector3d vtExtr ;
   pCrv->GetExtrusion( vtExtr) ;
   vtExtr.ToGlob( frFrame) ;
  // se senza spessore o con estrusione nulla, polilinea 3d
   if ( abs( dThick) < EPS_SMALL  ||  vtExtr.IsSmall()) {
     // esporto come polyline 3d
      if ( ! WriteItem( 0, "POLYLINE"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
     // colore
      if ( ! WriteItem( 62, nCol))
         return false ;
     // flag segnalazione entità successive dipendenti (vertex)
      if ( ! WriteItem( 66, 1))
         return false ;
     // punto inutile ma obbligatorio
      if ( ! WriteItem( 10, 0)  ||
           ! WriteItem( 20, 0)  ||
           ! WriteItem( 30, 0))
         return false ;
     // flag (3d)
      if ( ! WriteItem( 70, 8))
         return false ;
     // emetto i vertici
      Point3d ptP ;
      for ( bool bPnt = PL.GetFirstPoint( ptP) ;
            bPnt ;
            bPnt = PL.GetNextPoint( ptP)) {
        // entità vertice
         if ( ! WriteItem( 0, "VERTEX"))
            return false ;
        // layer
         if ( ! WriteItem( 8, sLay))
            return false ;
        // punto corrente
         ptP.ToGlob( frFrame) ;
         if ( ! WriteItem( 10, ptP.x)  ||
              ! WriteItem( 20, ptP.y)  ||
              ! WriteItem( 30, ptP.z))
            return false ;
        // flag (3d polyline)
         if ( ! WriteItem( 70, 32))
            return false ;
      }
     // entità termine dei vertici
      if ( ! WriteItem( 0, "SEQEND"))
         return false ;
     // layer
      if ( ! WriteItem( 8, sLay))
         return false ;
   }
  // altrimenti insieme di segmenti di retta
   else {
      Point3d ptStart, ptEnd ;
      for ( bool bPnt = PL.GetFirstLine( ptStart, ptEnd) ;
            bPnt ;
            bPnt = PL.GetNextLine( ptStart, ptEnd)) {
        // identificativo entità
         if ( ! WriteItem( 0, "LINE"))
            return false ;
        // layer
         if ( ! WriteItem( 8, sLay))
            return false ;
        // colore
         if ( ! WriteItem( 62, nCol))
            return false ;
        // punto iniziale
         ptStart.ToGlob( frFrame) ;
         if ( ! WriteItem( 10, ptStart.x)  ||
              ! WriteItem( 20, ptStart.y)  ||
              ! WriteItem( 30, ptStart.z))
            return false ;
        // punto finale
         ptEnd.ToGlob( frFrame) ;
         if ( ! WriteItem( 11, ptEnd.x)  ||
              ! WriteItem( 21, ptEnd.y)  ||
              ! WriteItem( 31, ptEnd.z))
            return false ;
        // spessore
         if ( abs( dThick) > EPS_SMALL) {
            if ( ! WriteItem( 39, dThick))
               return false ;
         }
        // vettore estrusione
         if ( ! vtExtr.IsZplus()) {
            if ( ! WriteItem( 210, vtExtr.x)  ||
                 ! WriteItem( 220, vtExtr.y)  ||
                 ! WriteItem( 230, vtExtr.z))
               return false ;
         }
      }
   }
   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::TestFilter( int nLev, int nMode, int nStat)
{
   if ( ( nLev == GDB_LV_USER  &&  ( m_nFilter & EEXFLT_LEVUSER) == 0)  ||
        ( nLev == GDB_LV_SYSTEM  &&  ( m_nFilter & EEXFLT_LEVSYSTEM) == 0)  ||
        ( nLev == GDB_LV_TEMP  &&  ( m_nFilter & EEXFLT_LEVTEMP) == 0))
      return false ;
   if ( ( nMode == GDB_MD_STD  &&  ( m_nFilter & EEXFLT_MODESTD) == 0)  ||
        ( nMode == GDB_MD_LOCKED  &&  ( m_nFilter & EEXFLT_MODELOCKED) == 0)  ||
        ( nMode == GDB_MD_HIDDEN  &&  ( m_nFilter & EEXFLT_MODEHIDDEN) == 0))
      return false ;
   if ( ( nStat == GDB_ST_OFF  &&  ( m_nFilter & EEXFLT_STAOFF) == 0)  ||
        ( nStat == GDB_ST_ON  &&  ( m_nFilter & EEXFLT_STAON) == 0)  ||
        ( nStat == GDB_ST_SEL  &&  ( m_nFilter & EEXFLT_STASEL) == 0))
      return false ;

   return true ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteItem( int nCode, int nVal)
{
   bool bOk = m_Writer.OutText(( nCode < 10 ? "  " :  nCode < 100 ? " " : "") + ToString( nCode)) ;
   bOk = bOk && m_Writer.OutText( ToString( nVal)) ;
   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteItem( int nCode, double dVal, int nPrec)
{
   bool bOk = m_Writer.OutText(( nCode < 10 ? "  " :  nCode < 100 ? " " : "") + ToString( nCode)) ;
   bOk = bOk && m_Writer.OutText( ToString( dVal, nPrec)) ;
   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::WriteItem( int nCode, const string& sVal)
{
   bool bOk = m_Writer.OutText(( nCode < 10 ? "  " :  nCode < 100 ? " " : "") + ToString( nCode)) ;
   bOk = bOk && m_Writer.OutText( sVal) ;
   return bOk ;
}

//----------------------------------------------------------------------------
bool
ExportDxf::ColorToACI( const Color& cCol, int& nColor)
{
  // recupero RGB
   int nRed = cCol.GetIntRed() ;
   int nGreen = cCol.GetIntGreen() ;
   int nBlue = cCol.GetIntBlue() ;

  // colori speciali (con indice 1...9)
   if ( nRed == MAX_RGB  &&  nGreen == 0  &&  nBlue == 0) {
      nColor = 1 ;       // rosso
      return true ;
   }
   else if ( nRed == MAX_RGB  &&  nGreen == MAX_RGB  &&  nBlue == 0) {
      nColor = 2 ;       // giallo
      return true ;
   }
   else if ( nRed == 0  &&  nGreen == MAX_RGB  &&  nBlue == 0) {
      nColor = 3 ;       // verde
      return true ;
   }
   else if ( nRed == 0  &&  nGreen == MAX_RGB  &&  nBlue == MAX_RGB) {
      nColor = 4 ;       // ciano
      return true ;
   }
   else if ( nRed == 0  &&  nGreen == 0  &&  nBlue == MAX_RGB) {
      nColor = 5 ;       // blu
      return true ;
   }
   else if ( nRed == MAX_RGB  &&  nGreen == 0  &&  nBlue == MAX_RGB) {
      nColor = 6 ;       // magenta
      return true ;
   }
   else if ( nRed == MAX_RGB  &&  nGreen == MAX_RGB  &&  nBlue == MAX_RGB) {
      nColor = 7 ;       // bianco
      return true ;
   }
   else if ( nRed == 128  &&  nGreen == 128  &&  nBlue == 128) {
      nColor = 8 ;       // grigio
      return true ;
   }
   else if ( nRed == 192  &&  nGreen == 192  &&  nBlue == 192) {
      nColor = 9 ;       // grigio chiaro
      return true ;
   }

  // calcolo HSV 
   int nH = max( max( nRed, nGreen), nBlue) ;
   int nL = min( min( nRed, nGreen), nBlue) ;
   double dValue = nH / double( MAX_RGB) ;
   double dSat = 0.0 ;
   if ( nH > 0)
      dSat = ( nH - nL) / double( nH) ;
   double dHue = 0.0 ;
   if ( nH == nL)
      dHue = 0.0 ;
   else if ( nH == nRed) {
      dHue = 0.0 + ( 60.0 * ( nGreen - nBlue) / double( nH - nL)) ;
      if ( dHue < 0)
         dHue += 360 ;
   }
   else if ( nH == nGreen)
      dHue = 120.0 + ( 60.0 * ( nBlue - nRed) /  double( nH - nL)) ;
   else if ( nH == nBlue)
      dHue = 240.0 + ( 60.0 * ( nRed - nGreen) / double( nH - nL)) ;

  // calcolo indice ACI
   // scala di grigi -> 250...255
   if ( dSat < 0.1) {
      if ( dValue < 0.3)
         nColor = 250 ;
      else if ( dValue < 0.45)
         nColor = 251 ;
      else if ( dValue < 0.6)
         nColor = 252 ;
       else if ( dValue < 0.75)
         nColor = 253 ;
      else if ( dValue < 0.9)
         nColor = 254 ;
      else
         nColor = 255 ;
      return true ;
   } 
   // colori generali -> 10...249
   // prime due cifre sono dHue (angolo) / 1.5, con offset di 10
   // ultima cifra 0,1 = 100% dValue, 2,3 = 80%, 4,5 = 60%, 6,7 = 50%, 8,9 = 30%
   // ultima cifra dispari se dSat < 50% altrimenti pari
   nColor = 10 + int( dHue / 1.5 + 0.9) ;
   nColor = max( 10, min( 249, nColor)) ;
   nColor -= ( nColor % 10) ;  // per avere l'ultima cifra uguale a 0
   if ( dValue < 0.31)
      nColor += 8 ;
   else if ( dValue < 0.51)
      nColor += 6 ;
   else if ( dValue < 0.61)
      nColor += 4 ;
   else if ( dValue < 0.81)
      nColor += 2 ;
   else
      nColor += 0 ;
   if ( dSat < 0.55)
      nColor += 1 ;

   return true ;
}

//----------------------------------------------------------------------------
string
ExportDxf::UpdateLayerName( const IGdbIterator& iIter, const string& sLay, bool* pbExact)
{
   string sNewLay ;
   string sName ;
   if ( iIter.GetName( sName)) {
      if ( m_bCompoundLayer  &&  sLay != LAY_DEFAULT)
         sNewLay = sLay + "_" + sName ;
      else
         sNewLay = sName ;
      if ( pbExact != nullptr)
         *pbExact = true ;
   }
   else {
      sNewLay = sLay ;
      if ( pbExact != nullptr)
         *pbExact = false ;
   }
   ValidateDxfName( sNewLay, m_bAdvancedNames) ;
   ToUpper( sNewLay) ;
   return sNewLay ;
}

//----------------------------------------------------------------------------
string
ExportDxf::FontNameToStyle( const string& sFontName)
{
   string sStyle = sFontName ;
  // se Nfe sostituisco con shx
   if ( FileExtensionMatches( sStyle, "NFE")) {
      sStyle.erase( sStyle.size() - 4, 4) ;
      sStyle += "_shx" ;
   }
   return sStyle ;
}

//----------------------------------------------------------------------------
string
ExportDxf::AdjustFontName( const string& sFontName)
{
   string sStyle = sFontName ;
  // se Nfe sostituisco con shx
   if ( FileExtensionMatches( sStyle, "NFE")) {
      sStyle.erase( sStyle.size() - 4, 4) ;
      sStyle += ".shx" ;
   }
   return sStyle ;
}