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 // Created on: 1993-07-29
 // Created by: Remi LEQUETTE
 // Copyright (c) 1993-1999 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 _BRepBuilderAPI_MakePolygon_HeaderFile
 #define _BRepBuilderAPI_MakePolygon_HeaderFile
 
 #include <Standard.hxx>
 #include <Standard_DefineAlloc.hxx>
 #include <Standard_Handle.hxx>
 
 #include <BRepLib_MakePolygon.hxx>
 #include <BRepBuilderAPI_MakeShape.hxx>
 class gp_Pnt;
 class TopoDS_Vertex;
 class TopoDS_Edge;
 class TopoDS_Wire;
 
 //! Describes functions to build polygonal wires. A
 //! polygonal wire can be built from any number of points
 //! or vertices, and consists of a sequence of connected
 //! rectilinear edges.
 //! When a point or vertex is added to the polygon if
 //! it is identic to the previous point no edge is
 //! built. The method added can be used to test it.
 //! Construction of a Polygonal Wire
 //! You can construct:
 //! -   a complete polygonal wire by defining all its points
 //! or vertices (limited to four), or
 //! -   an empty polygonal wire and add its points or
 //! vertices in sequence (unlimited number).
 //! A MakePolygon object provides a framework for:
 //! -   initializing the construction of a polygonal wire,
 //! -   adding points or vertices to the polygonal wire under construction, and
 //! -   consulting the result.
 class BRepBuilderAPI_MakePolygon : public BRepBuilderAPI_MakeShape
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Initializes an empty polygonal wire, to which points or
   //! vertices are added using the Add function.
   //! As soon as the polygonal wire under construction
   //! contains vertices, it can be consulted using the Wire function.
   Standard_EXPORT BRepBuilderAPI_MakePolygon();
 
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const gp_Pnt& P1, const gp_Pnt& P2);
 
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const gp_Pnt& P1,
                                              const gp_Pnt& P2,
                                              const gp_Pnt& P3,
                                              const bool    Close = false);
 
   //! Constructs a polygonal wire from 2, 3 or 4 points. Vertices are
   //! automatically created on the given points. The polygonal wire is
   //! closed if Close is true; otherwise it is open. Further vertices can
   //! be added using the Add function. The polygonal wire under
   //! construction can be consulted at any time by using the Wire function.
   //! Example
   //! //an open polygon from four points
   //! TopoDS_Wire W = BRepBuilderAPI_MakePolygon(P1,P2,P3,P4);
   //! Warning: The process is equivalent to:
   //! - initializing an empty polygonal wire,
   //! - and adding the given points in sequence.
   //! Consequently, be careful when using this function: if the
   //! sequence of points p1 - p2 - p1 is found among the arguments of the
   //! constructor, you will create a polygonal wire with two
   //! consecutive coincident edges.
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const gp_Pnt& P1,
                                              const gp_Pnt& P2,
                                              const gp_Pnt& P3,
                                              const gp_Pnt& P4,
                                              const bool    Close = false);
 
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const TopoDS_Vertex& V1, const TopoDS_Vertex& V2);
 
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const TopoDS_Vertex& V1,
                                              const TopoDS_Vertex& V2,
                                              const TopoDS_Vertex& V3,
                                              const bool           Close = false);
 
   //! Constructs a polygonal wire from
   //! 2, 3 or 4 vertices. The polygonal wire is closed if Close is true;
   //! otherwise it is open (default value). Further vertices can be
   //! added using the Add function. The polygonal wire under
   //! construction can be consulted at any time by using the Wire function.
   //! Example
   //! //a closed triangle from three vertices
   //! TopoDS_Wire W = BRepBuilderAPI_MakePolygon(V1,V2,V3,true);
   //! Warning
   //! The process is equivalent to:
   //! -      initializing an empty polygonal wire,
   //! -      then adding the given points in sequence.
   //! So be careful, as when using this function, you could create a
   //! polygonal wire with two consecutive coincident edges if
   //! the sequence of vertices v1 - v2 - v1 is found among the
   //! constructor's arguments.
   Standard_EXPORT BRepBuilderAPI_MakePolygon(const TopoDS_Vertex& V1,
                                              const TopoDS_Vertex& V2,
                                              const TopoDS_Vertex& V3,
                                              const TopoDS_Vertex& V4,
                                              const bool           Close = false);
 
   Standard_EXPORT void Add(const gp_Pnt& P);
 
   //! Adds the point P or the vertex V at the end of the
   //! polygonal wire under construction. A vertex is
   //! automatically created on the point P.
   //! Warning
   //! -   When P or V is coincident to the previous vertex,
   //! no edge is built. The method Added can be used to
   //! test for this. Neither P nor V is checked to verify
   //! that it is coincident with another vertex than the last
   //! one, of the polygonal wire under construction. It is
   //! also possible to add vertices on a closed polygon
   //! (built for example by using a constructor which
   //! declares the polygon closed, or after the use of the Close function).
   //! Consequently, be careful using this function: you might create:
   //! -      a polygonal wire with two consecutive coincident edges, or
   //! -      a non manifold polygonal wire.
   //! -      P or V is not checked to verify if it is
   //! coincident with another vertex but the last one, of
   //! the polygonal wire under construction. It is also
   //! possible to add vertices on a closed polygon (built
   //! for example by using a constructor which declares
   //! the polygon closed, or after the use of the Close function).
   //! Consequently, be careful when using this function: you might create:
   //! -   a polygonal wire with two consecutive coincident edges, or
   //! -   a non-manifold polygonal wire.
   Standard_EXPORT void Add(const TopoDS_Vertex& V);
 
   //! Returns true if the last vertex added to the constructed
   //! polygonal wire is not coincident with the previous one.
   Standard_EXPORT bool Added() const;
 
   //! Closes the polygonal wire under construction. Note - this
   //! is equivalent to adding the first vertex to the polygonal
   //! wire under construction.
   Standard_EXPORT void Close();
 
   Standard_EXPORT const TopoDS_Vertex& FirstVertex() const;
 
   //! Returns the first or the last vertex of the polygonal wire under construction.
   //! If the constructed polygonal wire is closed, the first and the last vertices are identical.
   Standard_EXPORT const TopoDS_Vertex& LastVertex() const;
 
   //! Returns true if this algorithm contains a valid polygonal
   //! wire (i.e. if there is at least one edge).
   //! IsDone returns false if fewer than two vertices have
   //! been chained together by this construction algorithm.
   Standard_EXPORT bool IsDone() const override;
 
   //! Returns the edge built between the last two points or
   //! vertices added to the constructed polygonal wire under construction.
   //! Warning
   //! If there is only one vertex in the polygonal wire, the result is a null edge.
   Standard_EXPORT const TopoDS_Edge& Edge() const;
   Standard_EXPORT                    operator TopoDS_Edge() const;
 
   //! Returns the constructed polygonal wire, or the already
   //! built part of the polygonal wire under construction.
   //! Exceptions
   //! StdFail_NotDone if the wire is not built, i.e. if fewer than
   //! two vertices have been chained together by this construction algorithm.
   Standard_EXPORT const TopoDS_Wire& Wire();
   Standard_EXPORT                    operator TopoDS_Wire();
 
 private:
   BRepLib_MakePolygon myMakePolygon;
 };
 
 #endif // _BRepBuilderAPI_MakePolygon_HeaderFile

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