text: // Created on: 1998-06-03
  // Created by: data exchange team
  // Copyright (c) 1998-1999 Matra Datavision
  // Copyright (c) 1999-2014 OPEN CASCADE SAS
  //
  // This file is part of Open CASCADE Technology software library.
  //
  // This library is free software; you can redistribute it and/or modify it under
  // the terms of the GNU Lesser General Public License version 2.1 as published
  // by the Free Software Foundation, with special exception defined in the file
  // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
  // distribution for complete text of the license and disclaimer of any warranty.
  //
  // Alternatively, this file may be used under the terms of Open CASCADE
  // commercial license or contractual agreement.
  
  #ifndef _ShapeAnalysis_Shell_HeaderFile
  #define _ShapeAnalysis_Shell_HeaderFile
  
  #include <Standard.hxx>
  #include <Standard_DefineAlloc.hxx>
  #include <Standard_Handle.hxx>
  
  #include <TopTools_IndexedMapOfShape.hxx>
  #include <Standard_Boolean.hxx>
  #include <Standard_Integer.hxx>
  class TopoDS_Shape;
  class TopoDS_Compound;
  
  
  //! This class provides operators to analyze edges orientation
  //! in the shell.
  class ShapeAnalysis_Shell 
  {
  public:
  
    DEFINE_STANDARD_ALLOC
  
    
    //! Clears data about loaded shells and performed checks
    Standard_EXPORT void Clear();
    
    //! Adds shells contained in the <shape> to the list of loaded shells
    Standard_EXPORT void LoadShells (const TopoDS_Shape& shape);
    
    //! Checks if shells fulfill orientation condition, i.e. if each
    //! edge is, either present once (free edge) or twice (connected
    //! edge) but with different orientations (FORWARD/REVERSED)
    //! Edges which do not fulfill these conditions are bad
    //!
    //! If <alsofree> is True free edges are considered.
    //! Free edges can be queried but are not bad
    Standard_EXPORT Standard_Boolean CheckOrientedShells (const TopoDS_Shape& shape, const Standard_Boolean alsofree = Standard_False, const Standard_Boolean checkinternaledges = Standard_False);
    
    //! Tells if a shape is loaded (only shells are checked)
    Standard_EXPORT Standard_Boolean IsLoaded (const TopoDS_Shape& shape) const;
    
    //! Returns the actual number of loaded shapes (i.e. shells)
    Standard_EXPORT Standard_Integer NbLoaded() const;
    
    //! Returns a loaded shape specified by its rank number.
    //! Returns null shape if <num> is out of range
    Standard_EXPORT TopoDS_Shape Loaded (const Standard_Integer num) const;
    
    //! Tells if at least one edge is recorded as bad
    Standard_EXPORT Standard_Boolean HasBadEdges() const;
    
    //! Returns the list of bad edges as a Compound
    //! It is empty (not null) if no edge are recorded as bad
    Standard_EXPORT TopoDS_Compound BadEdges() const;
    
    //! Tells if at least one edge is recorded as free (not connected)
    Standard_EXPORT Standard_Boolean HasFreeEdges() const;
    
    //! Returns the list of free (not connected) edges as a Compound
    //! It is empty (not null) if no edge are recorded as free
    Standard_EXPORT TopoDS_Compound FreeEdges() const;
    
    //! Tells if at least one edge is connected (shared twice or more)
    Standard_EXPORT Standard_Boolean HasConnectedEdges() const;
  
  
  
  
  protected:
  
  
  
  
  
  private:
  
  
  
    TopTools_IndexedMapOfShape myShells;
    TopTools_IndexedMapOfShape myBad;
    TopTools_IndexedMapOfShape myFree;
    Standard_Boolean myConex;
  
  
  };
  
  
  
  
  
  
  
  #endif // _ShapeAnalysis_Shell_HeaderFile
  