Open CASCADE Technology 6.6.0
Public Member Functions
Poly_Polygon2D Class Reference

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.

#include <Poly_Polygon2D.hxx>

Inheritance diagram for Poly_Polygon2D:
Inheritance graph
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Public Member Functions

 Poly_Polygon2D (const TColgp_Array1OfPnt2d &Nodes)
 Constructs a 2D polygon defined by the table of points, <Nodes>.

Standard_Real Deflection () 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:

void Deflection (const Standard_Real D)
 Sets the deflection of this polygon to D

Standard_Integer NbNodes () const
 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.

const TColgp_Array1OfPnt2dNodes () const
 Returns the table of nodes for this polygon.


Constructor & Destructor Documentation

Poly_Polygon2D::Poly_Polygon2D ( const TColgp_Array1OfPnt2d Nodes)

Member Function Documentation

Standard_Real Poly_Polygon2D::Deflection ( ) const
  • 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.
void Poly_Polygon2D::Deflection ( const Standard_Real  D)
Standard_Integer Poly_Polygon2D::NbNodes ( ) const
const TColgp_Array1OfPnt2d& Poly_Polygon2D::Nodes ( ) const

The documentation for this class was generated from the following file:
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