Open CASCADE Technology  7.4.0
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. More...

#include <Poly_Polygon2D.hxx>

Inheritance diagram for Poly_Polygon2D: [legend]

Public Member Functions

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

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: More...

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

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. More...

const TColgp_Array1OfPnt2dNodes () const
Returns the table of nodes for this polygon. More... Public Member Functions inherited from Standard_Transient
Standard_Transient ()
Empty constructor. More...

Standard_Transient (const Standard_Transient &)
Copy constructor – does nothing. More...

Standard_Transientoperator= (const Standard_Transient &)
Assignment operator, needed to avoid copying reference counter. More...

virtual ~Standard_Transient ()
Destructor must be virtual. More...

virtual void Delete () const
Memory deallocator for transient classes. More...

virtual const opencascade::handle< Standard_Type > & DynamicType () const

Standard_Boolean IsInstance (const opencascade::handle< Standard_Type > &theType) const
Returns a true value if this is an instance of Type. More...

Standard_Boolean IsInstance (const Standard_CString theTypeName) const
Returns a true value if this is an instance of TypeName. More...

Standard_Boolean IsKind (const opencascade::handle< Standard_Type > &theType) const
Returns true if this is an instance of Type or an instance of any class that inherits from Type. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_Boolean IsKind (const Standard_CString theTypeName) const
Returns true if this is an instance of TypeName or an instance of any class that inherits from TypeName. Note that multiple inheritance is not supported by OCCT RTTI mechanism. More...

Standard_TransientThis () const
Returns non-const pointer to this object (like const_cast). For protection against creating handle to objects allocated in stack or call from constructor, it will raise exception Standard_ProgramError if reference counter is zero. More...

Standard_Integer GetRefCount () const
Get the reference counter of this object. More...

void IncrementRefCounter () const
Increments the reference counter of this object. More...

Standard_Integer DecrementRefCounter () const
Decrements the reference counter of this object; returns the decremented value. More... Public Types inherited from Standard_Transient
typedef void base_type Static Public Member Functions inherited from Standard_Transient
static const char * get_type_name ()

static const opencascade::handle< Standard_Type > & get_type_descriptor ()
Returns type descriptor of Standard_Transient class. More...

Detailed Description

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.

◆ Poly_Polygon2D()

 Poly_Polygon2D::Poly_Polygon2D ( const TColgp_Array1OfPnt2d & Nodes )

Constructs a 2D polygon defined by the table of points, <Nodes>.

◆ Deflection() [1/2]

 Standard_Real Poly_Polygon2D::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:

• 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.

◆ Deflection() [2/2]

 void Poly_Polygon2D::Deflection ( const Standard_Real D )

Sets the deflection of this polygon to D.

◆ NbNodes()

 Standard_Integer Poly_Polygon2D::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.

◆ Nodes()

 const TColgp_Array1OfPnt2d& Poly_Polygon2D::Nodes ( ) const

Returns the table of nodes for this polygon.

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