CGAL users discussion list

["Marcos R. P." <>]

In the 2,621 page of cgal_manual.pdf there are the following information:

 

"In particular, we can basically perform every operation we can perform in a standard DCEL data structure:

• go from a halfedge to its next and previous in the face;

• go from one face to an adjacent one through a halfedge and its twin (opposite) halfedge;

• walk around the boundary of a face;

• enumerate/traverse the halfedges incident to a vertex

• from a halfedge, access the adjacent face;

• from a face, access an adjacent halfedges;

• from a halfedges, access its source and target vertices;

• from a vertex, access an incident halfedge.

In addition to the above possibilities for traversal, we can also traverse the following features through iterators:

• the vertices of the Voronoi diagram;

• the edges or halfedges of the Voronoi diagram;

• the faces of the Voronoi diagram;

• the bounded faces of the Voronoi diagram;

• the bounded halfedges of the Voronoi diagram;

• the unbounded faces of the Voronoi diagram;

• the unbounded halfedges of the Voronoi diagram;

• the sites defining the Voronoi diagram."

 

Remember that "intelliSense" of my Visual Studio 2008 don't works.

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De: Marcos R. P. <>
Para:
Enviadas: Seg, Outubro 26, 2009 2:43:29 PM
Assunto: [cgal-discuss] Next Face

Errata.

Sorry!

The matter is "Next Face"

The code is:

 

VD::Face_iterator fit = vd.faces_begin();

for( ; fit != vd.faces_end(); ++fit )

{

std::cout << "\nFace " << std::endl;

print_faceVertices( &vd.bounded_face() );

std::cout << std::endl;

}//fim for

---

De: Marcos R. P. <>
Para: cgal discuss <>
Enviadas: Seg, Outubro 26, 2009 2:28:59 PM
Assunto: [cgal-discuss]

Hi!

 

How could I get the next face of VD?

The following code would must print all the bounded faces of VD but it prints the same face throughout the loop for.

VD::Face_iterator fit = vd.faces_begin();

for( ; fit != vd.faces_end(); ++fit )

{

std::cout << "\nFace " << std::endl;

if( vd

print_faceVertices( &vd.bounded_face() );

std::cout << std::endl;

}//fim for

 

Thank you!

 

MRP.

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