vcglib/vcg/simplex/edge/pos.h

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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 $
2007-05-31 11:39:56 +02:00
Revision 1.2 2004/05/10 14:40:47 ganovelli
name of adhacency function updated
2004-05-10 16:41:45 +02:00
Revision 1.1 2004/05/10 14:01:56 ganovelli
created
2004-05-10 16:02:29 +02:00
****************************************************************************/
#ifndef __VCG_EDGE_POS
#define __VCG_EDGE_POS
namespace vcg {
namespace edge {
/*
Vertex_Edge: run over the fan of a vertex (no order is specified)
*/
/** Class VertexStar
@param EDGETYPE Specifies the type of the faces
*/
template <class EDGETYPE>
class VertexStar
{
public:
/// Pointer to an edge
EDGETYPE *e;
/// Local index of the vertex
int z;
/// Default Constructor
VertexStar() {}
/// Constructor which associates the EdgePos elementet with a face and its edge
VertexStar(EDGETYPE * const ep, int const zp)
{
e=ep;
z=zp;
}
/// Function to jump on the next face of the list of vertex z
void NextF()
{
EDGETYPE * t = e;
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e = (EDGETYPE *)t->VEp(z);
z = t->VEi(z);
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}
};
/*
*/
/** Class Pos.
This structure is equivalent to a half-edge.
@param MFTYPE (Template-Parameter) Specifies the type of the edges
*/
template <class EDGETYPE>
class Pos
{
public:
/// The vertex type
typedef typename EDGETYPE::VertexType VertexType;
/////The HEdgePos type
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typedef Pos< EDGETYPE> POSTYPE;
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///// The vector type
//typedef typename MVTYPE::coord_type vectorial_type;
///// The scalar type
//typedef typename MVTYPE::scalar_type scalar_type;
/// Pointer to the face of the half-edge
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EDGETYPE *e;
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/// Pointer to the vertex
VertexType *v;
/// Default constructor
Pos(){}
/// Constructor which associates the half-edge elementet with a face, its edge and its vertex
Pos(EDGETYPE * const ep, int const zp,
VertexType * const vp){e=ep;v=vp;}
/// Operator to compare two half-edge
inline bool operator == ( POSTYPE const & p ) const {
return (e==p.e &&v==p.v);
}
/// Operator to compare two half-edge
inline bool operator != ( POSTYPE const & p ) const {
return (e!=p.e || 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 (e!=p.e)?(e<e.p):
(v<=p.v);
}
/// Assignment operator
inline POSTYPE & operator = ( const POSTYPE & h ){
e=h.e;
v=h.v;
return *this;
}
/// Set to null the half-edge
void SetNull(){
e=0;
v=0;
}
/// Check if the half-edge is null
bool IsNull() const {
return e==0 || v==0 ;
}
//Cambia Faccia lungo z
// e' uguale a FlipF solo che funziona anche per non manifold.
/// Change face via z
void NextE()
{
FlipV();
FlipE();
}
// 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: MFTYPE * & f, MVTYPE * v, int & j
// Cambia edge mantenendo la stessa faccia e lo stesso vertice
/// Changes edge maintaining the same face and the same vertex
void FlipV()
{
v = (e->V(0)==v)?e->V(1):e->V(0);
}
void FlipE()
{
assert( (e->V(0)==v) ||(e->V(1)==v));
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e = (e->V(0)==v)?e->EEp(0):e->EEp(1);
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}
int Z(){
return (e->V(0)==v)?0:1;
}
// return the vertex that it should have if we make FlipV;
VertexType *VFlip()
{
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return (e->V(0)==v)?e->V(1):e->V(0);
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}
// 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->F(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(!f->IsBorder(z));
//
// // L'edge j e' di bordo e deve contenere v
// assert(f->IsBorder(z) &&( 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->F(z)==f); // f is border along j
}
/// Checks if the half-edge is of border
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//bool IsBorder()
//{
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//return f->IsBorder(z);
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//}
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/// Return the dimension of the star
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//int StarSize()
//{
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//int n=0;
//POSTYPE ht=*this;
//bool bf=false;
//do
//{
// ++n;
// ht.NextE();
// if(ht.IsBorder()) bf=true;
//} while(ht!=*this);
//if(bf) return n/2;
//else return n;
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//}
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/** Function to inizialize an half-edge.
@param fp Puntatore alla faccia
@param zp Indice dell'edge
@param vp Puntatore al vertice
*/
void Set(EDGETYPE * const ep,VertexType * const vp)
{
e=ep;v=vp;
}
void Assert()
#ifdef _DEBUG
{/*
POSTYPE ht=*this;
ht.FlipE();
ht.FlipE();
assert(ht==*this);
ht.FlipE();
ht.FlipE();
assert(ht==*this);
ht.FlipV();
ht.FlipV();
assert(ht==*this);*/
}
#else
{}
#endif
// Controlla la coerenza di orientamento di un hpos con la relativa faccia
/// Checks the orientation coherence of a half-edge with the face
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//inline bool Coherent() const
//{
// return v == f->V(z); // e^(ip)+1=0 ovvero E=mc^2
//}
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};
} // end namespace
} // end namespace
#endif