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108 lines
3.4 KiB
C++
108 lines
3.4 KiB
C++
// Created on: 1995-03-09
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// Created by: Laurent PAINNOT
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// Copyright (c) 1995-1999 Matra Datavision
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// Copyright (c) 1999-2014 OPEN CASCADE SAS
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//
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// This file is part of Open CASCADE Technology software library.
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//
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// This library is free software; you can redistribute it and/or modify it under
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// the terms of the GNU Lesser General Public License version 2.1 as published
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// by the Free Software Foundation, with special exception defined in the file
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// OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
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// distribution for complete text of the license and disclaimer of any warranty.
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//
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// Alternatively, this file may be used under the terms of Open CASCADE
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// commercial license or contractual agreement.
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#ifndef _Poly_Polygon2D_HeaderFile
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#define _Poly_Polygon2D_HeaderFile
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#include <Standard.hxx>
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#include <Standard_Type.hxx>
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#include <Standard_Real.hxx>
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#include <TColgp_Array1OfPnt2d.hxx>
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#include <MMgt_TShared.hxx>
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#include <Standard_Integer.hxx>
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class Standard_NullObject;
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class Poly_Polygon2D;
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DEFINE_STANDARD_HANDLE(Poly_Polygon2D, MMgt_TShared)
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//! Provides a polygon in 2D space (for example, in the
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//! parametric space of a surface). It is generally an
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//! approximate representation of a curve.
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//! A Polygon2D is defined by a table of nodes. Each node is
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//! a 2D point. If the polygon is closed, the point of closure is
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//! repeated at the end of the table of nodes.
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class Poly_Polygon2D : public MMgt_TShared
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{
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public:
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//! Constructs a 2D polygon defined by the table of points, <Nodes>.
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Standard_EXPORT Poly_Polygon2D(const TColgp_Array1OfPnt2d& Nodes);
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//! Returns the deflection of this polygon.
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//! Deflection is used in cases where the polygon is an
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//! approximate representation of a curve. Deflection
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//! represents the maximum distance permitted between any
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//! point on the curve and the corresponding point on the polygon.
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//! By default the deflection value is equal to 0. An algorithm
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//! using this 2D polygon with a deflection value equal to 0
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//! considers that it is working with a true polygon and not with
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//! an approximate representation of a curve. The Deflection
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//! function is used to modify the deflection value of this polygon.
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//! The deflection value can be used by any algorithm working with 2D polygons.
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//! For example:
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//! - An algorithm may use a unique deflection value for all
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//! its polygons. In this case it is not necessary to use the
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//! Deflection function.
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//! - Or an algorithm may want to attach a different
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//! deflection to each polygon. In this case, the Deflection
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//! function is used to set a value on each polygon, and
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//! later to fetch the value.
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Standard_EXPORT Standard_Real Deflection() const;
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//! Sets the deflection of this polygon to D
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Standard_EXPORT void Deflection (const Standard_Real D);
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//! Returns the number of nodes in this polygon.
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//! Note: If the polygon is closed, the point of closure is
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//! repeated at the end of its table of nodes. Thus, on a closed
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//! triangle, the function NbNodes returns 4.
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Standard_Integer NbNodes() const;
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//! Returns the table of nodes for this polygon.
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Standard_EXPORT const TColgp_Array1OfPnt2d& Nodes() const;
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DEFINE_STANDARD_RTTIEXT(Poly_Polygon2D,MMgt_TShared)
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protected:
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private:
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Standard_Real myDeflection;
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TColgp_Array1OfPnt2d myNodes;
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};
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#include <Poly_Polygon2D.lxx>
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#endif // _Poly_Polygon2D_HeaderFile
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