Open CASCADE Technology 6.6.0
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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>
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_Array1OfPnt2d & | Nodes () const |
Returns the table of nodes for this polygon. |
Poly_Polygon2D::Poly_Polygon2D | ( | const TColgp_Array1OfPnt2d & | Nodes | ) |
Standard_Real Poly_Polygon2D::Deflection | ( | ) | const |
void Poly_Polygon2D::Deflection | ( | const Standard_Real | D | ) |
Standard_Integer Poly_Polygon2D::NbNodes | ( | ) | const |
const TColgp_Array1OfPnt2d& Poly_Polygon2D::Nodes | ( | ) | const |