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 // Created on: 1995-03-09
 // Created by: Laurent PAINNOT
 // Copyright (c) 1995-1999 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 _Poly_Polygon2D_HeaderFile
 #define _Poly_Polygon2D_HeaderFile
 
 #include <gp_Pnt2d.hxx>
 #include <NCollection_Array1.hxx>
 #include <Standard_Transient.hxx>
 
 //! Provides a polygon in 2D space (for example, in the
 //! parametric space of a surface). It is generally an
 //! approximate representation of a curve.
 //! A Polygon2D is defined by a table of nodes. Each node is
 //! a 2D point. If the polygon is closed, the point of closure is
 //! repeated at the end of the table of nodes.
 class Poly_Polygon2D : public Standard_Transient
 {
 public:
   //! Constructs a 2D polygon with specified number of nodes.
   Standard_EXPORT explicit Poly_Polygon2D(const int theNbNodes);
 
   //! Constructs a 2D polygon defined by the table of points, <Nodes>.
   Standard_EXPORT Poly_Polygon2D(const NCollection_Array1<gp_Pnt2d>& Nodes);
 
   //! Creates a copy of current polygon.
   Standard_EXPORT virtual occ::handle<Poly_Polygon2D> Copy() const;
 
   //! Returns the deflection of this polygon.
   //! Deflection is used in cases where the polygon is an
   //! approximate representation of a curve. Deflection
   //! represents the maximum distance permitted between any
   //! point on the curve and the corresponding point on the polygon.
   //! By default the deflection value is equal to 0. An algorithm
   //! using this 2D polygon with a deflection value equal to 0
   //! considers that it is working with a true polygon and not with
   //! an approximate representation of a curve. The Deflection
   //! function is used to modify the deflection value of this polygon.
   //! The deflection value can be used by any algorithm working with 2D polygons.
   //! For example:
   //! -   An algorithm may use a unique deflection value for all
   //! its polygons. In this case it is not necessary to use the
   //! Deflection function.
   //! -   Or an algorithm may want to attach a different
   //! deflection to each polygon. In this case, the Deflection
   //! function is used to set a value on each polygon, and
   //! later to fetch the value.
   double Deflection() const { return myDeflection; }
 
   //! Sets the deflection of this polygon.
   void Deflection(const double theDefl) { myDeflection = theDefl; }
 
   //! Returns the number of nodes in this polygon.
   //! Note: If the polygon is closed, the point of closure is
   //! repeated at the end of its table of nodes. Thus, on a closed
   //! triangle, the function NbNodes returns 4.
   int NbNodes() const { return myNodes.Length(); }
 
   //! Returns the table of nodes for this polygon.
   const NCollection_Array1<gp_Pnt2d>& Nodes() const { return myNodes; }
 
   //! Returns the table of nodes for this polygon.
   NCollection_Array1<gp_Pnt2d>& ChangeNodes() { return myNodes; }
 
   //! Dumps the content of me into the stream
   Standard_EXPORT virtual void DumpJson(Standard_OStream& theOStream, int theDepth = -1) const;
 
   DEFINE_STANDARD_RTTIEXT(Poly_Polygon2D, Standard_Transient)
 
 private:
   double                       myDeflection;
   NCollection_Array1<gp_Pnt2d> myNodes;
 };
 
 #endif // _Poly_Polygon2D_HeaderFile

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