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 // Created on: 2016-11-10
 // Created by: Anton KOZULIN
 // Copyright (c) 2016 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 _TDataXtd_Triangulation_HeaderFile
 #define _TDataXtd_Triangulation_HeaderFile
 
 #include <Standard.hxx>
 
 #include <Poly_Triangulation.hxx>
 #include <TDF_Attribute.hxx>
 #include <Standard_Integer.hxx>
 #include <Standard_OStream.hxx>
 class Standard_GUID;
 class TDF_Label;
 class TDF_RelocationTable;
 
 //! An Ocaf attribute containing a mesh (Poly_Triangulation).
 //! It duplicates all methods from Poly_Triangulation.
 //! It is highly recommended to modify the mesh through the methods of this attribute,
 //! but not directly via the underlying Poly_Triangulation object.
 //! In this case Undo/Redo will work fine and robust.
 class TDataXtd_Triangulation : public TDF_Attribute
 {
 public:
   //! Static methods
   //  ==============
 
   //! Returns the ID of the triangulation attribute.
   Standard_EXPORT static const Standard_GUID& GetID();
 
   //! Finds or creates a triangulation attribute.
   Standard_EXPORT static occ::handle<TDataXtd_Triangulation> Set(const TDF_Label& theLabel);
 
   //! Finds or creates a triangulation attribute.
   //! Initializes the attribute by a Poly_Triangulation object.
   Standard_EXPORT static occ::handle<TDataXtd_Triangulation> Set(
     const TDF_Label&                       theLabel,
     const occ::handle<Poly_Triangulation>& theTriangulation);
 
   //! Object methods
   //  ==============
 
   //! A constructor.
   //! Don't use it directly,
   //! use please the static method Set(),
   //! which returns the attribute attached to a label.
   Standard_EXPORT TDataXtd_Triangulation();
 
   //! Sets the triangulation.
   Standard_EXPORT void Set(const occ::handle<Poly_Triangulation>& theTriangulation);
 
   //! Returns the underlying triangulation.
   Standard_EXPORT const occ::handle<Poly_Triangulation>& Get() const;
 
   //! Poly_Triangulation methods
   //  =================
 
   //! The methods are "covered" by this attribute to prevent direct modification of the mesh.
   //! There is no performance problem to call Poly_Triangulation method through this attribute.
   //! The most of the methods are considered as "inline" by the compiler in release mode.
 
   //! Returns the deflection of this triangulation.
   Standard_EXPORT double Deflection() const;
 
   //! Sets the deflection of this triangulation to theDeflection.
   //! See more on deflection in Polygon2D
   Standard_EXPORT void Deflection(const double theDeflection);
 
   //! Deallocates the UV nodes.
   Standard_EXPORT void RemoveUVNodes();
 
   //! @return the number of nodes for this triangulation.
   Standard_EXPORT int NbNodes() const;
 
   //! @return the number of triangles for this triangulation.
   Standard_EXPORT int NbTriangles() const;
 
   //! @return true if 2D nodes are associated with 3D nodes for this triangulation.
   Standard_EXPORT bool HasUVNodes() const;
 
   //! @return node at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbNodes.
   Standard_EXPORT gp_Pnt Node(const int theIndex) const;
 
   //! The method differs from Poly_Triangulation!
   //! Sets a node at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbNodes.
   Standard_EXPORT void SetNode(const int theIndex, const gp_Pnt& theNode);
 
   //! @return UVNode at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbNodes.
   Standard_EXPORT gp_Pnt2d UVNode(const int theIndex) const;
 
   //! The method differs from Poly_Triangulation!
   //! Sets a UVNode at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbNodes.
   Standard_EXPORT void SetUVNode(const int theIndex, const gp_Pnt2d& theUVNode);
 
   //! @return triangle at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbTriangles.
   Standard_EXPORT Poly_Triangle Triangle(const int theIndex) const;
 
   //! The method differs from Poly_Triangulation!
   //! Sets a triangle at the given index.
   //! Raises Standard_OutOfRange exception if theIndex is less than 1 or greater than NbTriangles.
   Standard_EXPORT void SetTriangle(const int theIndex, const Poly_Triangle& theTriangle);
 
   //! Changes normal at the given index.
   //! Raises Standard_OutOfRange exception.
   Standard_EXPORT void SetNormal(const int theIndex, const gp_Dir& theNormal);
 
   //! Returns true if nodal normals are defined.
   Standard_EXPORT bool HasNormals() const;
 
   //! @return normal at the given index.
   //! Raises Standard_OutOfRange exception.
   Standard_EXPORT gp_Dir Normal(const int theIndex) const;
 
   //! Inherited attribute methods
   //  ===========================
 
   Standard_EXPORT const Standard_GUID& ID() const override;
 
   Standard_EXPORT void Restore(const occ::handle<TDF_Attribute>& theAttribute) override;
 
   Standard_EXPORT occ::handle<TDF_Attribute> NewEmpty() const override;
 
   Standard_EXPORT void Paste(const occ::handle<TDF_Attribute>&       Into,
                              const occ::handle<TDF_RelocationTable>& RT) const override;
 
   Standard_EXPORT Standard_OStream& Dump(Standard_OStream& anOS) const override;
 
   DEFINE_STANDARD_RTTI_INLINE(TDataXtd_Triangulation, TDF_Attribute)
 
 private:
   occ::handle<Poly_Triangulation> myTriangulation;
 };
 
 #endif // _TDataXtd_Triangulation_HeaderFile

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