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 // Copyright (c) 2013 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 _BRepMesh_IncrementalMesh_HeaderFile
 #define _BRepMesh_IncrementalMesh_HeaderFile
 
 #include <BRepMesh_DiscretRoot.hxx>
 #include <IMeshTools_Context.hxx>
 #include <Standard_NumericError.hxx>
 
 //! Builds the mesh of a shape with respect of their 
 //! correctly triangulated parts 
 class BRepMesh_IncrementalMesh : public BRepMesh_DiscretRoot
 {
 public: //! @name mesher API
 
   //! Default constructor
   Standard_EXPORT BRepMesh_IncrementalMesh();
 
   //! Destructor
   Standard_EXPORT virtual ~BRepMesh_IncrementalMesh();
 
   //! Constructor.
   //! Automatically calls method Perform.
   //! @param theShape shape to be meshed.
   //! @param theLinDeflection linear deflection.
   //! @param isRelative if TRUE deflection used for discretization of 
   //! each edge will be <theLinDeflection> * <size of edge>. Deflection 
   //! used for the faces will be the maximum deflection of their edges.
   //! @param theAngDeflection angular deflection.
   //! @param isInParallel if TRUE shape will be meshed in parallel.
   Standard_EXPORT BRepMesh_IncrementalMesh(const TopoDS_Shape&    theShape,
                                            const Standard_Real    theLinDeflection,
                                            const Standard_Boolean isRelative = Standard_False,
                                            const Standard_Real    theAngDeflection = 0.5,
                                            const Standard_Boolean isInParallel = Standard_False);
 
   //! Constructor.
   //! Automatically calls method Perform.
   //! @param theShape shape to be meshed.
   //! @param theParameters - parameters of meshing
   Standard_EXPORT BRepMesh_IncrementalMesh(const TopoDS_Shape&          theShape,
                                            const IMeshTools_Parameters& theParameters,
                                            const Message_ProgressRange& theRange = Message_ProgressRange());
 
   //! Performs meshing of the shape.
   Standard_EXPORT virtual void Perform(const Message_ProgressRange& theRange = Message_ProgressRange()) Standard_OVERRIDE;
 
   //! Performs meshing using custom context;
   Standard_EXPORT void Perform(const Handle(IMeshTools_Context)& theContext,
                                const Message_ProgressRange& theRange = Message_ProgressRange());
   
 public: //! @name accessing to parameters.
 
   //! Returns meshing parameters
   const IMeshTools_Parameters& Parameters() const
   {
     return myParameters;
   }
 
   //! Returns modifiable meshing parameters
   IMeshTools_Parameters& ChangeParameters()
   {
     return myParameters;
   }
 
   //! Returns modified flag.
   Standard_Boolean IsModified() const
   {
     return myModified;
   }
   
   //! Returns accumulated status flags faced during meshing.
   Standard_Integer GetStatusFlags() const
   {
     return myStatus;
   }
   
 private:
 
   //! Initializes specific parameters
   void initParameters()
   {
     if (myParameters.Deflection < Precision::Confusion())
     {
       throw Standard_NumericError ("BRepMesh_IncrementalMesh::initParameters : invalid parameter value");
     }
     if (myParameters.DeflectionInterior < Precision::Confusion())
     {
       myParameters.DeflectionInterior = myParameters.Deflection;
     }
 
     if (myParameters.MinSize < Precision::Confusion())
     {
       myParameters.MinSize =
         Max(IMeshTools_Parameters::RelMinSize() * Min(myParameters.Deflection,
                                                       myParameters.DeflectionInterior),
             Precision::Confusion());
     }
 
     if (myParameters.Angle < Precision::Angular())
     {
       throw Standard_NumericError ("BRepMesh_IncrementalMesh::initParameters : invalid parameter value");
     }
     if (myParameters.AngleInterior < Precision::Angular())
     {
       myParameters.AngleInterior = 2.0 * myParameters.Angle;
     }
   }
 
 public: //! @name plugin API
 
   //! Plugin interface for the Mesh Factories.
   //! Initializes meshing algorithm with the given parameters.
   //! @param theShape shape to be meshed.
   //! @param theLinDeflection linear deflection.
   //! @param theAngDeflection angular deflection.
   //! @param[out] theAlgo pointer to initialized algorithm.
   Standard_EXPORT static Standard_Integer Discret(const TopoDS_Shape&    theShape,
                                                   const Standard_Real    theLinDeflection,
                                                   const Standard_Real    theAngDeflection,
                                                   BRepMesh_DiscretRoot* &theAlgo);
   
   //! Returns multi-threading usage flag set by default in 
   //! Discret() static method (thus applied only to Mesh Factories).
   Standard_EXPORT static Standard_Boolean IsParallelDefault();
   
   //! Setup multi-threading usage flag set by default in 
   //! Discret() static method (thus applied only to Mesh Factories).
   Standard_EXPORT static void SetParallelDefault(const Standard_Boolean isInParallel);
 
   DEFINE_STANDARD_RTTIEXT(BRepMesh_IncrementalMesh, BRepMesh_DiscretRoot)
 
 protected:
 
   IMeshTools_Parameters myParameters;
   Standard_Boolean      myModified;
   Standard_Integer      myStatus;
 };
 
 #endif

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