BRepBuilderAPI_MakePolygon Class Reference

Describes functions to build polygonal wires. A
polygonal wire can be built from any number of points
or vertices, and consists of a sequence of connected
rectilinear edges.
When a point or vertex is added to the polygon if
it is identic to the previous point no edge is
built. The method added can be used to test it.
Construction of a Polygonal Wire
You can construct:
More...

#include <BRepBuilderAPI_MakePolygon.hxx>

Inheritance diagram for BRepBuilderAPI_MakePolygon:

Public Member Functions
	BRepBuilderAPI_MakePolygon ()
	Initializes an empty polygonal wire, to which points or <br> vertices are added using the Add function. As soon as the polygonal wire under construction contains vertices, it can be consulted using the Wire function. More...
	BRepBuilderAPI_MakePolygon (const gp_Pnt &P1, const gp_Pnt &P2)
	BRepBuilderAPI_MakePolygon (const gp_Pnt &P1, const gp_Pnt &P2, const gp_Pnt &P3, const Standard_Boolean Close=Standard_False)
	BRepBuilderAPI_MakePolygon (const gp_Pnt &P1, const gp_Pnt &P2, const gp_Pnt &P3, const gp_Pnt &P4, const Standard_Boolean Close=Standard_False)
	Constructs a polygonal wire from 2, 3 or 4 points. Vertices are <br> automatically created on the given points. The polygonal wire is closed if Close is true; otherwise it is open. Further vertices can be added using the Add function. The polygonal wire under construction can be consulted at any time by using the Wire function. Example //an open polygon from four points TopoDS_Wire W = BRepBuilderAPI_MakePolygon(P1,P2,P3,P4); Warning: The process is equivalent to: More...
	BRepBuilderAPI_MakePolygon (const TopoDS_Vertex &V1, const TopoDS_Vertex &V2)
	BRepBuilderAPI_MakePolygon (const TopoDS_Vertex &V1, const TopoDS_Vertex &V2, const TopoDS_Vertex &V3, const Standard_Boolean Close=Standard_False)
	BRepBuilderAPI_MakePolygon (const TopoDS_Vertex &V1, const TopoDS_Vertex &V2, const TopoDS_Vertex &V3, const TopoDS_Vertex &V4, const Standard_Boolean Close=Standard_False)
	Constructs a polygonal wire from <br> 2, 3 or 4 vertices. The polygonal wire is closed if Close is true; otherwise it is open (default value). Further vertices can be added using the Add function. The polygonal wire under construction can be consulted at any time by using the Wire function. Example //a closed triangle from three vertices TopoDS_Wire W = BRepBuilderAPI_MakePolygon(V1,V2,V3,Standard_True); Warning The process is equivalent to: More...
void	Add (const gp_Pnt &P)
void	Add (const TopoDS_Vertex &V)
	Adds the point P or the vertex V at the end of the polygonal wire under construction. A vertex is automatically created on the point P. Warning More...
Standard_Boolean	Added () const
	Returns true if the last vertex added to the constructed <br> polygonal wire is not coincident with the previous one. More...
void	Close ()
	Closes the polygonal wire under construction. Note - this <br> is equivalent to adding the first vertex to the polygonal wire under construction. More...
const TopoDS_Vertex &	FirstVertex () const
const TopoDS_Vertex &	LastVertex () const
	Returns the first or the last vertex of the polygonal wire under construction. <br> If the constructed polygonal wire is closed, the first and the last vertices are identical. More...
virtual Standard_Boolean	IsDone () const
	Returns true if this algorithm contains a valid polygonal wire (i.e. if there is at least one edge). IsDone returns false if fewer than two vertices have been chained together by this construction algorithm. More...
const TopoDS_Edge &	Edge () const
	Returns the edge built between the last two points or <br> vertices added to the constructed polygonal wire under construction. Warning If there is only one vertex in the polygonal wire, the result is a null edge. More...
	operator TopoDS_Edge () const
const TopoDS_Wire &	Wire () const
	Returns the constructed polygonal wire, or the already built part of the polygonal wire under construction. Exceptions StdFail_NotDone if the wire is not built, i.e. if fewer than two vertices have been chained together by this construction algorithm. More...
	operator TopoDS_Wire () const
Public Member Functions inherited from BRepBuilderAPI_MakeShape
virtual void	Delete ()
virtual	~BRepBuilderAPI_MakeShape ()
virtual void	Build ()
	This is called by Shape(). It does nothing but may be redefined. More...
const TopoDS_Shape &	Shape () const
	Returns a shape built by the shape construction algorithm. <br> Raises exception StdFail_NotDone if the shape was not built. More...
	operator TopoDS_Shape () const
virtual const TopTools_ListOfShape &	Generated (const TopoDS_Shape &S)
	Returns the list of shapes generated from the shape <S>. More...
virtual const TopTools_ListOfShape &	Modified (const TopoDS_Shape &S)
	Returns the list of shapes modified from the shape <S>. More...
virtual Standard_Boolean	IsDeleted (const TopoDS_Shape &S)
	Returns true if the shape S has been deleted. More...
Public Member Functions inherited from BRepBuilderAPI_Command
virtual	~BRepBuilderAPI_Command ()
void	Check () const
	Raises NotDone if done is false. More...

Additional Inherited Members
Protected Member Functions inherited from BRepBuilderAPI_MakeShape
	BRepBuilderAPI_MakeShape ()
Protected Member Functions inherited from BRepBuilderAPI_Command
	BRepBuilderAPI_Command ()
	Set done to False. More...
void	Done ()
	Set done to true. More...
void	NotDone ()
	Set done to false. More...
Protected Attributes inherited from BRepBuilderAPI_MakeShape
TopoDS_Shape	myShape
TopTools_ListOfShape	myGenerated

Detailed Description

Describes functions to build polygonal wires. A
polygonal wire can be built from any number of points
or vertices, and consists of a sequence of connected
rectilinear edges.
When a point or vertex is added to the polygon if
it is identic to the previous point no edge is
built. The method added can be used to test it.
Construction of a Polygonal Wire
You can construct:

• a complete polygonal wire by defining all its points
  or vertices (limited to four), or
  

an empty polygonal wire and add its points or
vertices in sequence (unlimited number).
A MakePolygon object provides a framework for:

• initializing the construction of a polygonal wire,
  
• adding points or vertices to the polygonal wire under construction, and
  
• consulting the result.
  

Constructor & Destructor Documentation

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon

(

)

 Initializes an empty polygonal wire, to which points or <br>

vertices are added using the Add function.
As soon as the polygonal wire under construction
contains vertices, it can be consulted using the Wire function.

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const gp_Pnt &	P1,
		const gp_Pnt &	P2
	)

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const gp_Pnt &	P1,
		const gp_Pnt &	P2,
		const gp_Pnt &	P3,
		const Standard_Boolean	Close = Standard_False
	)

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const gp_Pnt &	P1,
		const gp_Pnt &	P2,
		const gp_Pnt &	P3,
		const gp_Pnt &	P4,
		const Standard_Boolean	Close = Standard_False
	)

 Constructs a polygonal wire from 2, 3 or 4 points. Vertices are <br>

automatically created on the given points. The polygonal wire is
closed if Close is true; otherwise it is open. Further vertices can
be added using the Add function. The polygonal wire under
construction can be consulted at any time by using the Wire function.
Example
//an open polygon from four points
TopoDS_Wire W = BRepBuilderAPI_MakePolygon(P1,P2,P3,P4);
Warning: The process is equivalent to:

• initializing an empty polygonal wire,
  
• and adding the given points in sequence.
  Consequently, be careful when using this function: if the
  sequence of points p1 - p2 - p1 is found among the arguments of the
  constructor, you will create a polygonal wire with two
  consecutive coincident edges.
  

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const TopoDS_Vertex &	V1,
		const TopoDS_Vertex &	V2
	)

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const TopoDS_Vertex &	V1,
		const TopoDS_Vertex &	V2,
		const TopoDS_Vertex &	V3,
		const Standard_Boolean	Close = Standard_False
	)

BRepBuilderAPI_MakePolygon::BRepBuilderAPI_MakePolygon	(	const TopoDS_Vertex &	V1,
		const TopoDS_Vertex &	V2,
		const TopoDS_Vertex &	V3,
		const TopoDS_Vertex &	V4,
		const Standard_Boolean	Close = Standard_False
	)

 Constructs a polygonal wire from <br>

2, 3 or 4 vertices. The polygonal wire is closed if Close is true;
otherwise it is open (default value). Further vertices can be
added using the Add function. The polygonal wire under
construction can be consulted at any time by using the Wire function.
Example
//a closed triangle from three vertices
TopoDS_Wire W = BRepBuilderAPI_MakePolygon(V1,V2,V3,Standard_True);
Warning
The process is equivalent to:

• initializing an empty polygonal wire,
  
• then adding the given points in sequence.
  So be careful, as when using this function, you could create a
  polygonal wire with two consecutive coincident edges if
  the sequence of vertices v1 - v2 - v1 is found among the
  constructor's arguments.
  

Member Function Documentation

void BRepBuilderAPI_MakePolygon::Add

(

const gp_Pnt &

P

)

void BRepBuilderAPI_MakePolygon::Add

(

const TopoDS_Vertex &

V

)

Adds the point P or the vertex V at the end of the
polygonal wire under construction. A vertex is
automatically created on the point P.
Warning

• When P or V is coincident to the previous vertex,
  no edge is built. The method Added can be used to
  test for this. Neither P nor V is checked to verify
  that it is coincident with another vertex than the last
  one, of the polygonal wire under construction. It is
  also possible to add vertices on a closed polygon
  (built for example by using a constructor which
  declares the polygon closed, or after the use of the Close function).
  Consequently, be careful using this function: you might create:
  
• a polygonal wire with two consecutive coincident edges, or
  
• a non manifold polygonal wire.
  
• P or V is not checked to verify if it is
  coincident with another vertex but the last one, of
  the polygonal wire under construction. It is also
  possible to add vertices on a closed polygon (built
  for example by using a constructor which declares
  the polygon closed, or after the use of the Close function).
  Consequently, be careful when using this function: you might create:
  
  • a polygonal wire with two consecutive coincident edges, or
    
  • a non-manifold polygonal wire.
    

Standard_Boolean BRepBuilderAPI_MakePolygon::Added

(

)

const

 Returns true if the last vertex added to the constructed <br>

polygonal wire is not coincident with the previous one.

void BRepBuilderAPI_MakePolygon::Close

(

)

 Closes the polygonal wire under construction. Note - this <br>

is equivalent to adding the first vertex to the polygonal
wire under construction.

const TopoDS_Edge& BRepBuilderAPI_MakePolygon::Edge

(

)

const

 Returns the edge built between the last two points or <br>

vertices added to the constructed polygonal wire under construction.
Warning
If there is only one vertex in the polygonal wire, the result is a null edge.

const TopoDS_Vertex& BRepBuilderAPI_MakePolygon::FirstVertex

(

)

const

virtual Standard_Boolean BRepBuilderAPI_MakePolygon::IsDone ( ) const

virtual

Returns true if this algorithm contains a valid polygonal
wire (i.e. if there is at least one edge).
IsDone returns false if fewer than two vertices have
been chained together by this construction algorithm.

Reimplemented from BRepBuilderAPI_Command.

const TopoDS_Vertex& BRepBuilderAPI_MakePolygon::LastVertex

(

)

const

 Returns the first or the last vertex of the polygonal wire under construction. <br>

If the constructed polygonal wire is closed, the first and the last vertices are identical.

BRepBuilderAPI_MakePolygon::operator TopoDS_Edge

(

)

const

BRepBuilderAPI_MakePolygon::operator TopoDS_Wire

(

)

const

const TopoDS_Wire& BRepBuilderAPI_MakePolygon::Wire

(

)

const

Returns the constructed polygonal wire, or the already
built part of the polygonal wire under construction.
Exceptions
StdFail_NotDone if the wire is not built, i.e. if fewer than
two vertices have been chained together by this construction algorithm.

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

• BRepBuilderAPI_MakePolygon.hxx