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/****************************************************************************
* VCGLib o o *
* Visual and Computer Graphics Library o o *
* _ O _ *
* Copyright(C) 2004 \/)\/ *
* Visual Computing Lab /\/| *
* ISTI - Italian National Research Council | *
* \ *
* All rights reserved. *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License (http://www.gnu.org/licenses/gpl.txt) *
* for more details. *
* *
****************************************************************************/
/****************************************************************************
History
$Log: not supported by cvs2svn $
Revision 1.32 2007/10/17 19:46:50 cignoni
Added I() access function for the z member to the pos
Revision 1.31 2007/05/28 14:09:41 fiorin
Added Set method which takes a face pointer and a vertex pointer.
Revision 1.30 2007/05/16 15:11:32 fiorin
Replaced ambigous StarSize method with NumberOfIncidentVertices and NumberOfIncidentFaces
Revision 1.29 2007/04/20 12:40:31 cignoni
Corrected V() operator. It was plainly wrong. Luckly enough it was not very used
Revision 1.28 2007/01/11 10:37:08 cignoni
Added include assert.h
Revision 1.27 2007/01/02 10:06:53 giec
Added access functions F()
Revision 1.26 2006/12/29 13:13:00 giec
Corrected wrong assert in V(i) access function
Revision 1.25 2006/12/04 16:06:12 cignoni
Added FFlip() and const VFlip() operators
Revision 1.24 2006/11/13 01:57:23 cignoni
Added a missing prototype to ismanifold
Revision 1.23 2006/11/09 17:22:56 cignoni
Added ismanifold
Revision 1.22 2006/10/07 14:24:26 cignoni
Explained the use of V() operator of a pos
Revision 1.21 2006/09/25 09:57:49 cignoni
Better comment on usage of VF iterators
Revision 1.20 2005/12/15 11:57:48 corsini
Replace Pos<FaceType> with PosType
Revision 1.19 2005/12/15 11:19:00 corsini
Fix operators
Revision 1.18 2005/12/15 10:53:16 corsini
Add constructor which takes as input a face and a vertex
Revision 1.17 2005/10/16 23:30:39 ponchio
IsBorder(...) declaration needed.
Revision 1.16 2005/10/13 09:29:10 cignoni
Removed the reference to Deprecated f->IsBorder(i) now everyone should use IsBorder(*f,i);
Revision 1.15 2005/01/03 11:22:31 cignoni
Added better documentation (with an example and the V0 V1 V2 access members
Revision 1.14 2004/10/28 00:50:48 cignoni
Better Doxygen documentation
Revision 1.13 2004/10/18 17:14:42 ganovelli
error FFP -> FFp
Revision 1.12 2004/09/14 19:46:10 ganovelli
constructor added
Revision 1.11 2004/08/25 15:15:27 ganovelli
minor changes to comply gcc compiler (typename's and stuff)
Revision 1.10 2004/07/27 09:47:49 cignoni
Added V() access function instead of V(0)
Revision 1.9 2004/07/18 07:45:30 cignoni
Removed two const modifiers from the VFIterator
Revision 1.8 2004/07/15 12:03:07 ganovelli
minor changes
Revision 1.7 2004/07/15 11:28:44 ganovelli
basefacetype to facetype
Revision 1.6 2004/07/06 06:25:44 cignoni
changed the VFIterator ++ to return a facepointer instead of a bool
Revision 1.5 2004/06/02 16:25:45 ganovelli
changed F(.. to FFp
changed Z( to FFi(
Revision 1.4 2004/05/10 15:21:47 cignoni
Added a constructor without vertex pointer
Revision 1.3 2004/05/10 13:41:57 cignoni
Added VFIterator
Revision 1.2 2004/03/12 15:22:28 cignoni
Written some documentation and added to the trimes doxygen module
Revision 1.1 2004/03/10 08:32:30 cignoni
Initial commit
****************************************************************************/
/** \file face/pos.h
* Definition of vcg:face::Pos class.
* This file contain the definition of vcg::face::Pos class and the derived vcg::face::PosN class.
*/
#ifndef __VCG_FACE_POS
#define __VCG_FACE_POS
#include <assert.h>
namespace vcg {
namespace face {
/** \addtogroup face */
/*@{*/
// Needed Prototypes (pos is include before topology)
template <class FaceType>
bool IsBorder(FaceType const & f, const int j );
template <class FaceType>
bool IsManifold(FaceType const & f, const int j );
/** Templated over the class face, it stores a \em position over a face in a mesh.
It contain a pointer to the current face,
the index of one edge and a pointer to one of the vertices of the edge.
See also the JumpingPos in jumping_pos.h for an iterator that loops
around the faces of a vertex without requiring the VF topology.
*/
template <class FaceType>
class Pos
{
public:
/// The vertex type
typedef typename FaceType::VertexType VertexType;
///The Pos type
typedef Pos<FaceType> PosType;
/// The scalar type
typedef typename VertexType::ScalarType ScalarType;
/// Pointer to the face of the half-edge
typename FaceType::FaceType *f;
/// Index of the edge
int z;
/// Pointer to the vertex
VertexType *v;
/// Default constructor
Pos(){}
/// Constructor which associates the half-edge element with a face, its edge and its vertex
Pos(FaceType * const fp, int const zp, VertexType * const vp){f=fp; z=zp; v=vp;}
Pos(FaceType * const fp, int const zp){f=fp; z=zp; v=f->V(zp);}
Pos(FaceType * const fp, VertexType * const vp)
{
f = fp;
v = vp;
if (f->V(0) == v)
z = 2;
else if (f->V(1) == v)
z = 0;
else if (f->V(2) == v)
z = 1;
}
// Official Access functions functions
VertexType *& V(){ return v; }
int & E(){ return z; }
FaceType *& F(){ return f; }
// Returns the face index of the vertex inside the face.
// Note that this is DIFFERENT from using the z member that denotes the edge index inside the face.
// It should holds that Vind != (z+1)%3 && Vind == z || Vind = z+2%3
int VInd()
{
if(v==f->V(0)) return 0;
if(v==f->V(1)) return 1;
if(v==f->V(2)) return 2;
assert(0);
}
/// Operator to compare two half-edge
inline bool operator == ( PosType const & p ) const {
return (f==p.f && z==p.z && v==p.v);
}
/// Operator to compare two half-edge
inline bool operator != ( PosType const & p ) const {
return (f!=p.f || z!=p.z || v!=p.v);
}
/// Operator to order half-edge; it's compare at the first the face pointers, then the index of the edge and finally the vertex pointers
inline bool operator <= ( PosType const & p) const {
return (f!=p.f)?(f<f.p):
(z!=p.z)?(z<p.z):
(v<=p.v);
}
/// Assignment operator
inline FaceType & operator = ( const FaceType & h ){
f=h.f;
z=h.z;
v=h.v;
return *this;
}
/// Set to null the half-edge
void SetNull(){
f=0;
v=0;
z=-1;
}
/// Check if the half-edge is null
bool IsNull() const {
return f==0 || v==0 || z<0;
}
//Cambia Faccia lungo z
// e' uguale a FlipF solo che funziona anche per non manifold.
/// Change face via z
void NextF()
{
FaceType * t = f;
f = t->FFp(z);
z = t->FFi(z);
}
// Paolo Cignoni 19/6/99
// Si muove sulla faccia adiacente a f, lungo uno spigolo che
// NON e' j, e che e' adiacente a v
// in questo modo si scandiscono tutte le facce incidenti in un
// vertice f facendo Next() finche' non si ritorna all'inizio
// Nota che sul bordo rimbalza, cioe' se lo spigolo !=j e' di bordo
// restituisce sempre la faccia f ma con nj che e' il nuovo spigolo di bordo
// vecchi parametri: FaceType * & f, VertexType * v, int & j
/// It moves on the adjacent face incident to v, via a different edge that j
void NextE()
{
assert( f->V(z)==v || f->V((z+1)%3)==v ); // L'edge j deve contenere v
FlipE();
FlipF();
assert( f->V(z)==v || f->V((z+1)%3)==v );
}
// Cambia edge mantenendo la stessa faccia e lo stesso vertice
/// Changes edge maintaining the same face and the same vertex
void FlipE()
{
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
if(f->V((z+1)%3)==v) z=(z+1)%3;
else z=(z-1+3)%3;
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
}
// Cambia Faccia mantenendo lo stesso vertice e lo stesso edge
// Vale che he.flipf.flipf= he
// Se l'he e' di bordo he.flipf()==he
// Si puo' usare SOLO se l'edge e' 2manifold altrimenti
// si deve usare nextf
/// Changes face maintaining the same vertex and the same edge
void FlipF()
{
assert( f->FFp(z)->FFp(f->FFi(z))==f ); // two manifoldness check
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
FaceType *nf=f->FFp(z);
int nz=f->FFi(z);
assert(nf->V((nz+2)%3)!=v && (nf->V((nz+1)%3)==v || nf->V((nz+0)%3)==v));
f=nf;
z=nz;
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
}
/// Changes vertex maintaining the same face and the same edge
void FlipV()
{
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
if(f->V((z+1)%3)==v)
v=f->V((z+0)%3);
else
v=f->V((z+1)%3);
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
}
// return the vertex that it should have if we make FlipV;
VertexType *VFlip()
{
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
if(f->V((z+1)%3)==v) return f->V((z+0)%3);
else return f->V((z+1)%3);
}
// return the vertex that it should have if we make FlipV;
const VertexType *VFlip() const
{
assert(f->cV((z+2)%3)!=v && (f->cV((z+1)%3)==v || f->cV((z+0)%3)==v));
if(f->cV((z+1)%3)==v) return f->cV((z+0)%3);
else return f->cV((z+1)%3);
}
// return the face that it should have if we make FlipF;
const FaceType *FFlip() const
{
assert( f->FFp(z)->FFp(f->FFi(z))==f );
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
FaceType *nf=f->FFp(z);
return nf;
}
// Trova il prossimo half-edge di bordo (nhe)
// tale che
// --nhe.f adiacente per vertice a he.f
// --nhe.v adiacente per edge di bordo a he.v
// l'idea e' che se he e' un half edge di bordo
// si puo scorrere tutto un bordo facendo
//
// hei=he;
// do
// hei.Nextb()
// while(hei!=he);
/// Finds the next half-edge border
void NextB( )
{
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
assert(f->FFp(z)==f); // f is border along j
// Si deve cambiare faccia intorno allo stesso vertice v
//finche' non si trova una faccia di bordo.
do
NextE();
while(!IsBorder());
// L'edge j e' di bordo e deve contenere v
assert(IsBorder() &&( f->V(z)==v || f->V((z+1)%3)==v ));
FlipV();
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
assert(f->FFp(z)==f); // f is border along j
}
/// Checks if the half-edge is of border
bool IsBorder()
{
return face::IsBorder(*f,z);
}
bool IsManifold()
{
return face::IsManifold(*f,z);
}
/*!
* Returns the number of vertices incident on the vertex pos is currently pointing to.
*/
int NumberOfIncidentVertices()
{
int count = 0;
bool on_border = false;
CheckIncidentFaces(count, on_border);
if(on_border) return (count/2)+1;
else return count;
}
/*!
* Returns the number of faces incident on the vertex pos is currently pointing to.
*/
int NumberOfIncidentFaces()
{
int count = 0;
bool on_border = false;
CheckIncidentFaces(count, on_border);
if(on_border) return count/2;
else return count;
}
/** Function to inizialize an half-edge.
@param fp Puntatore alla faccia
@param zp Indice dell'edge
@param vp Puntatore al vertice
*/
void Set(FaceType * const fp, int const zp, VertexType * const vp)
{
f=fp;z=zp;v=vp;
assert(f->V((z+2)%3)!=v && (f->V((z+1)%3)==v || f->V((z+0)%3)==v));
}
void Set(FaceType * const pFace, VertexType * const pVertex)
{
f = pFace;
v = pVertex;
if (f->V(0) == v) z = 2;
else if (f->V(1) == v) z = 0;
else if (f->V(2) == v) z = 1;
}
void Assert()
#ifdef _DEBUG
{
FaceType ht=*this;
ht.FlipF();
ht.FlipF();
assert(ht==*this);
ht.FlipE();
ht.FlipE();
assert(ht==*this);
ht.FlipV();
ht.FlipV();
assert(ht==*this);
}
#else
{}
#endif
protected:
void CheckIncidentFaces(int & count, bool & on_border)
{
PosType ht = *this;
do
{
++count;
ht.NextE();
if(ht.IsBorder()) on_border=true;
} while (ht != *this);
}
};
template <class FaceType>
/** Class PosN.
This structure is equivalent to a Pos, but it contains a normal.
@param FaceType (Template-Parameter) Specifies the type of the faces
*/
class PosN : public Pos<FaceType>
{
public:
typedef typename FaceType::CoordType CoordType;
//normale per visualizzazione creaseangle
CoordType normal;
};
/** Class VFIterator.
This class is used as an iterator over the VF adjacency.
It allow to easily traverse all the faces around a given vertex v;
The faces are traversed in no particular order. No Manifoldness requirement.
typical example:
VertexPointer v;
vcg::face::VFIterator<FaceType> vfi(v);
for (;!vfi.End();++vfi)
vfi.F()->ClearV();
// Alternative
vcg::face::VFIterator<FaceType> vfi(f, 1);
while (!vfi.End()){
vfi.F()->ClearV();
++vfi;
}
See also the JumpingPos in jumping_pos.h for an iterator that loops
around the faces of a vertex using FF topology and without requiring the VF topology.
*/
template <typename FaceType>
class VFIterator
{
public:
/// The vertex type
typedef typename FaceType::VertexType VertexType;
/// The Base face type
typedef FaceType VFIFaceType;
/// The vector type
typedef typename VertexType::CoordType CoordType;
/// The scalar type
typedef typename VertexType::ScalarType ScalarType;
/// Pointer to the face of the half-edge
FaceType *f;
/// Index of the vertex
int z;
/// Default constructor
VFIterator(){}
/// Constructor which associates the half-edge elementet with a face and its vertex
VFIterator(FaceType * _f, const int & _z){f = _f; z = _z;}
/// Constructor which takes a pointer to vertex
VFIterator(VertexType * _v){f = _v->VFp(); z = _v->VFi();}
VFIFaceType *& F() { return f;}
int & I() { return z;}
// Access to the vertex. Having a VFIterator vfi, it corresponds to
// vfi.V() = vfi.F()->V(vfi.I())
inline VertexType *V() const { return f->V(z);}
inline VertexType * const & V0() const { return f->V0(z);}
inline VertexType * const & V1() const { return f->V1(z);}
inline VertexType * const & V2() const { return f->V2(z);}
bool End() const {return f==0;}
VFIFaceType *operator++() {
FaceType* t = f;
f = f->VFp(z);
z = t->VFi(z);
return f;
}
};
/*@}*/
} // end namespace
} // end namespace
#endif
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