// 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
#include
#include
DEFINE_STANDARD_HANDLE(Poly_Polygon2D, Standard_Transient)
//! 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 Standard_Integer theNbNodes);
//! Constructs a 2D polygon defined by the table of points, .
Standard_EXPORT Poly_Polygon2D(const TColgp_Array1OfPnt2d& Nodes);
//! 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.
Standard_Real Deflection() const { return myDeflection; }
//! Sets the deflection of this polygon.
void Deflection (const Standard_Real 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.
Standard_Integer NbNodes() const { return myNodes.Length(); }
//! Returns the table of nodes for this polygon.
const TColgp_Array1OfPnt2d& Nodes() const { return myNodes; }
//! Returns the table of nodes for this polygon.
TColgp_Array1OfPnt2d& ChangeNodes() { return myNodes; }
//! Dumps the content of me into the stream
Standard_EXPORT virtual void DumpJson (Standard_OStream& theOStream, Standard_Integer theDepth = -1) const;
DEFINE_STANDARD_RTTIEXT(Poly_Polygon2D,Standard_Transient)
private:
Standard_Real myDeflection;
TColgp_Array1OfPnt2d myNodes;
};
#endif // _Poly_Polygon2D_HeaderFile