# FoundationClasses
TKMath
Poly

# Poly_Connect Class Reference

Provides an algorithm to explore, inside a triangulation, the
adjacency data for a node or a triangle.
Adjacency data for a node consists of triangles which
contain the node.
Adjacency data for a triangle consists of:
- the 3 adjacent triangles which share an edge of the triangle,
- and the 3 nodes which are the other nodes of these adjacent triangles.
Example
Inside a triangulation, a triangle T
has nodes n1, n2 and n3.
It has adjacent triangles AT1, AT2 and AT3 where:
- AT1 shares the nodes n2 and n3,
- AT2 shares the nodes n3 and n1,
- AT3 shares the nodes n1 and n2.
It has adjacent nodes an1, an2 and an3 where:
- an1 is the third node of AT1,
- an2 is the third node of AT2,
- an3 is the third node of AT3.
So triangle AT1 is composed of nodes n2, n3 and an1.
There are two ways of using this algorithm.
- From a given node you can look for one triangle that
passes through the node, then look for the triangles
adjacent to this triangle, then the adjacent nodes. You
can thus explore the triangulation step by step (functions
Triangle, Triangles and Nodes).
- From a given node you can look for all the triangles
that pass through the node (iteration method, using the
functions Initialize, More, Next and Value).
A Connect object can be seen as a tool which analyzes a
triangulation and translates it into a series of triangles. By
doing this, it provides an interface with other tools and
applications working on basic triangles, and which do not
work directly with a Poly_Triangulation.
.

`#include <Poly_Connect.hxx>`

## Public Member Functions

void * | operator new (size_t, void *anAddress)
void * | operator new (size_t size)
void | operator delete (void *anAddress)
Standard_EXPORT | Poly_Connect (const Handle(Poly_Triangulation)&T)
| Constructs an algorithm to explore the adjacency data of nodes or triangles for the triangulation T. .
Handle_Poly_Triangulation | Triangulation () const
| Returns the triangulation analyzed by this tool. .
Standard_Integer | Triangle (const Standard_Integer N) const
| Returns the index of a triangle containing the node at index N in the nodes table specific to the triangulation analyzed by this tool .
Standard_EXPORT void | Triangles (const Standard_Integer T, Standard_Integer &t1, Standard_Integer &t2, Standard_Integer &t3) const
| Returns in t1, t2 and t3, the indices of the 3 triangles adjacent to the triangle at index T in the triangles table specific to the triangulation analyzed by this tool. Warning Null indices are returned when there are fewer than 3 adjacent triangles. .
Standard_EXPORT void | Nodes (const Standard_Integer T, Standard_Integer &n1, Standard_Integer &n2, Standard_Integer &n3) const
| Returns, in n1, n2 and n3, the indices of the 3 nodes adjacent to the triangle referenced at index T in the triangles table specific to the triangulation analyzed by this tool. Warning Null indices are returned when there are fewer than 3 adjacent nodes. .
Standard_EXPORT void | Initialize (const Standard_Integer N)

Initializes an iterator to search for all the triangles
containing the node referenced at index N in the nodes
table, for the triangulation analyzed by this tool.
The iterator is managed by the following functions:
- More, which checks if there are still elements in the iterator
- Next, which positions the iterator on the next element
- Value, which returns the current element.
The use of such an iterator provides direct access to the
triangles around a particular node, i.e. it avoids iterating on
all the component triangles of a triangulation.
Example
Poly_Connect C(Tr);
for
(C.Initialize(n1);C.More();C.Next())
{
t = C.Value();
}
.

Standard_Boolean | More () const
| Returns true if there is another element in the iterator defined with the function Initialize (i.e. if there is another triangle containing the given node). .
Standard_EXPORT void | Next ()
| Advances the iterator defined with the function Initialize to access the next triangle. Note: There is no action if the iterator is empty (i.e. if the function More returns false).- .
Standard_EXPORT Standard_Integer | Value () const
| Returns the index of the current triangle to which the iterator, defined with the function Initialize, points. This is an index in the triangles table specific to the triangulation analyzed by this tool .

## Private Attributes

Handle_Poly_Triangulation | myTriangulation
TColStd_Array1OfInteger | myTriangles
TColStd_Array1OfInteger | myAdjacents
Standard_Integer | mytr
Standard_Integer | myfirst
Standard_Integer | mynode
Standard_Integer | myothernode
Standard_Boolean | mysense
Standard_Boolean | mymore

## Constructor & Destructor Documentation

Standard_EXPORT Poly_Connect::Poly_Connect | ( | const Handle(Poly_Triangulation)& | T | ) |

## Member Function Documentation

Standard_EXPORT void Poly_Connect::Initialize | ( | const Standard_Integer | N | ) |

Standard_Boolean Poly_Connect::More | ( |  | ) | const`[inline]`

Standard_EXPORT void Poly_Connect::Next | ( |  | ) |

Standard_EXPORT void Poly_Connect::Nodes | ( | const Standard_Integer | T,
|  | Standard_Integer & | n1,
|  | Standard_Integer & | n2,
|  | Standard_Integer & | n3
| ) | const

void Poly_Connect::operator delete | ( | void * | anAddress | ) | `[inline]`

void* Poly_Connect::operator new | ( | size_t | size | ) | `[inline]`

void* Poly_Connect::operator new | ( | size_t | ,
|  | void * | anAddress
| ) | `[inline]`

Standard_Integer Poly_Connect::Triangle | ( | const Standard_Integer | N | ) | const`[inline]`

Standard_EXPORT void Poly_Connect::Triangles | ( | const Standard_Integer | T,
|  | Standard_Integer & | t1,
|  | Standard_Integer & | t2,
|  | Standard_Integer & | t3
| ) | const

Handle_Poly_Triangulation Poly_Connect::Triangulation | ( |  | ) | const

Standard_EXPORT Standard_Integer Poly_Connect::Value | ( |  | ) | const

## Field Documentation

TColStd_Array1OfInteger Poly_Connect::myAdjacents `[private]`

Standard_Integer Poly_Connect::myfirst `[private]`

Standard_Boolean Poly_Connect::mymore `[private]`

Standard_Integer Poly_Connect::mynode `[private]`

Standard_Integer Poly_Connect::myothernode `[private]`

Standard_Boolean Poly_Connect::mysense `[private]`

Standard_Integer Poly_Connect::mytr `[private]`

TColStd_Array1OfInteger Poly_Connect::myTriangles `[private]`

Handle_Poly_Triangulation Poly_Connect::myTriangulation `[private]`

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

- Poly_Connect.hxx
- Poly_Connect.lxx