vcglib/vcg/complex/trimesh/update/flag.h

/****************************************************************************
* VCGLib                                                            o o     *
* Visual and Computer Graphics Library                            o     o   *
*                                                                _   O  _   *
* Copyright(C) 2004                                                \/)\/    *
* Visual Computing Lab                                            /\/|      *
* ISTI - Italian National Research Council                           |      *
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* GNU General Public License (http://www.gnu.org/licenses/gpl.txt)          *
* for more details.                                                         *
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/****************************************************************************
  History

$Log: not supported by cvs2svn $
Revision 1.20  2007/05/31 15:24:50  ponchio
FIxed off-by-one error on FaceBorderFromNone.

Revision 1.19  2007/05/22 15:19:42  cignoni
Added VertexClear

Revision 1.18  2007/01/30 18:49:23  tarini
aggiunta la VertexBorderFromNone (flag bordo per vertici senza richiedere nulla)

Revision 1.17  2006/08/31 13:11:12  marfr960
corrected bounds of a vector scan

Revision 1.16  2006/08/30 12:59:49  marfr960
Added missing std:: to swap

Revision 1.15  2006/08/30 06:50:07  cignoni
Reverted to version 1.13. Version 1.14 was done on outdated version.

Revision 1.13  2006/06/18 20:49:30  cignoni
Added missing IsD tests

Revision 1.12  2006/05/03 21:23:25  cignoni
Corrected IsDeleted -> isD

Revision 1.11  2005/12/02 00:09:12  cignoni
Added assert(HasFlags) everywhere..

Revision 1.10  2005/07/06 08:16:34  ganovelli
set VertexBorderFromFace as static

Revision 1.9  2005/06/10 15:07:23  cignoni
Completed FaceBorderFromNone (and added a missing helper class)

Revision 1.8  2005/04/01 13:04:55  fiorin
Minor changes

Revision 1.7  2004/09/14 19:49:43  ganovelli
first compilation version

Revision 1.6  2004/07/15 00:13:39  cignoni
Better doxigen documentation

Revision 1.5  2004/07/06 06:27:02  cignoni
Added  FaceBorderFromVF

Revision 1.4  2004/05/13 15:58:55  ganovelli
function Clear added

Revision 1.3  2004/03/12 15:22:19  cignoni
Written some documentation and added to the trimes doxygen module

Revision 1.2  2004/03/10 00:46:10  cignoni
changed to the face::IsBorder() style

Revision 1.1  2004/03/05 10:59:24  cignoni
Changed name from plural to singular (normals->normal)

Revision 1.1  2004/03/04 00:37:56  cignoni
First working version!


****************************************************************************/
#ifndef __VCG_TRI_UPDATE_FLAGS
#define __VCG_TRI_UPDATE_FLAGS

#include <vcg/simplex/face/pos.h>

namespace vcg {
namespace tri {
/** \addtogroup trimesh */
/*@{*/
/// Management, updating and computation of per-vertex and per-face flags (like border flags).
/// This class is used to compute or update some of the flags that can be stored in the mesh components. For now just Border flags (e.g. the flag that tells if a given edge of a face belong to a border of the mesh or not).

template <class UpdateMeshType>
class UpdateFlags
{

public:
typedef UpdateMeshType MeshType; 
typedef vcg::face::Pos<typename UpdateMeshType::FaceType> PosType;
typedef typename MeshType::VertexType     VertexType;
typedef typename MeshType::VertexPointer  VertexPointer;
typedef typename MeshType::VertexIterator VertexIterator;
typedef typename MeshType::FaceType       FaceType;
typedef typename MeshType::FacePointer    FacePointer;
typedef typename MeshType::FaceIterator   FaceIterator;

/** Reset all the mesh flags (both vertexes and faces) setting everithing to zero (the default value for flags)
**/
static void Clear(MeshType &m)
{
  assert(HasPerFaceFlags(m));
	FaceIterator fi;
	VertexIterator vi;
	for(fi=m.face.begin(); fi!=m.face.end(); ++fi)
		(*fi).Flags() = 0;
	for(vi=m.vert.begin(); vi!=m.vert.end(); ++vi)
		(*vi).Flags() = 0;
}

static void VertexClear(MeshType &m, unsigned int FlagMask = 0xffffffff)
{
	VertexIterator vi;
	int andMask = ~FlagMask;
	for(vi=m.vert.begin(); vi!=m.vert.end(); ++vi)
		if(!(*vi).IsD()) (*vi).Flags() &= andMask ;
}

static void VertexClearV(MeshType &m) { VertexClear(m,VertexType::VISITED);}
static void VertexClearB(MeshType &m) { VertexClear(m,VertexType::BORDER);}


/** Compute the border flags for the faces using the Face-Face Topology. 
Obviously it assumes that the topology has been correctly computed (see: UpdateTopology::FaceFace )
**/
static void FaceBorderFromFF(MeshType &m)
{
  assert(HasPerFaceFlags(m));
//	const int BORDERFLAG[3]={FaceType::BORDER0,FaceType::BORDER1,FaceType::BORDER2};
	FaceIterator fi;
	for(fi=m.face.begin();fi!=m.face.end();++fi)if(!(*fi).IsD())
		for(int j=0;j<3;++j)
		{
			//if(!(*fi).IsManifold(j)) (*fi).SetCF(j);
			//else 
      if(face::IsBorder(*fi,j)) (*fi).SetB(j);
					 else (*fi).ClearB(j);
		}
}


static void FaceBorderFromVF(MeshType &m)
{
  assert(HasPerFaceFlags(m));
	VertexIterator vi;
  assert(m.HasVFTopology());

  int visitedBit=VertexType::NewBitFlag();

	// Calcolo dei bordi
  // per ogni vertice vi si cercano i vertici adiacenti che sono toccati da una faccia sola
	// (o meglio da un numero dispari di facce)

		const int BORDERFLAG[3]={FaceType::BORDER0, FaceType::BORDER1, FaceType::BORDER2};
		
		for(vi=m.vert.begin();vi!=m.vert.end();++vi)
			if(!(*vi).IsD())
				{
					for(face::VFIterator<FaceType> vfi(&*vi) ; !vfi.End(); ++vfi )
          {
			          vfi.f->V1(vfi.z)->ClearUserBit(visitedBit);
								vfi.f->V2(vfi.z)->ClearUserBit(visitedBit);
          }
					for(face::VFIterator<FaceType> vfi(&*vi) ; !vfi.End(); ++vfi )
          {
            if(vfi.f->V1(vfi.z)->IsUserBit(visitedBit))  vfi.f->V1(vfi.z)->ClearUserBit(visitedBit);
																                    else vfi.f->V1(vfi.z)->SetUserBit(visitedBit);
						if(vfi.f->V2(vfi.z)->IsUserBit(visitedBit))  vfi.f->V2(vfi.z)->ClearUserBit(visitedBit);
																                    else vfi.f->V2(vfi.z)->SetUserBit(visitedBit);
					}
          for(face::VFIterator<FaceType> vfi(&*vi) ; !vfi.End(); ++vfi )
          {
	        		if(vfi.f->V(vfi.z)< vfi.f->V1(vfi.z)  &&  vfi.f->V1(vfi.z)->IsUserBit(visitedBit)) 
					        vfi.f->Flags() |= BORDERFLAG[vfi.z];
	        		if(vfi.f->V(vfi.z)< vfi.f->V2(vfi.z)  &&  vfi.f->V2(vfi.z)->IsUserBit(visitedBit)) 
					        vfi.f->Flags() |= BORDERFLAG[(vfi.z+2)%3];
          }
			}	
		VertexType::DeleteBitFlag(VertexType::LastBitFlag());
}

 
class EdgeSorter
{
public:
	
	VertexPointer v[2];		// Puntatore ai due vertici (Ordinati)
	FacePointer    f;				// Puntatore alla faccia generatrice
	int      z;				// Indice dell'edge nella faccia

  EdgeSorter() {} // Nothing to do


void Set( const FacePointer pf, const int nz )
{
	assert(pf!=0);
	assert(nz>=0);
	assert(nz<3);
	
	v[0] = pf->V(nz);
	v[1] = pf->V((nz+1)%3);
	assert(v[0] != v[1]);

	if( v[0] > v[1] ) std::swap(v[0],v[1]);
	f    = pf;
	z    = nz;
}

inline bool operator <  ( const EdgeSorter & pe ) const {
	if( v[0]<pe.v[0] ) return true;
	else if( v[0]>pe.v[0] ) return false;
	else return v[1] < pe.v[1];
}

inline bool operator == ( const EdgeSorter & pe ) const
{
	return v[0]==pe.v[0] && v[1]==pe.v[1];
}
inline bool operator != ( const EdgeSorter & pe ) const
{
	return v[0]!=pe.v[0] || v[1]!=pe.v[1];
}

};


// versione minimale che non calcola i complex flag.
static void VertexBorderFromNone(MeshType &m)
{
  assert(HasPerVertexFlags(m));
	std::vector<EdgeSorter> e;
	typename UpdateMeshType::FaceIterator pf;
	typename std::vector<EdgeSorter>::iterator p;

	if( m.fn == 0 ) 
		return;

	e.resize(m.fn*3);								// Alloco il vettore ausiliario
	p = e.begin();
	for(pf=m.face.begin();pf!=m.face.end();++pf)			// Lo riempio con i dati delle facce
		if( ! (*pf).IsD() )
			for(int j=0;j<3;++j)
			{
				(*p).Set(&(*pf),j);
				(*pf).ClearB(j);
				++p;
			}
	assert(p==e.end());
	sort(e.begin(), e.end());							// Lo ordino per vertici
	
	typename std::vector<EdgeSorter>::iterator pe,ps;
	for(ps = e.begin(), pe = e.begin(); pe < e.end(); ++pe)	// Scansione vettore ausiliario
	{
		if( pe==e.end() ||  *pe != *ps )					// Trovo blocco di edge uguali
		{
			if(pe-ps==1) 	{	
					ps->v[0]->SetB();
					ps->v[1]->SetB();
			} else
			if(pe-ps!=2)  {  // not twomanyfold!
				for(;ps!=pe;++ps) {
						ps->v[0]->SetB(); // Si settano border anche i complex.
						ps->v[1]->SetB();
        }
			} 
			ps = pe;
		}
	}
}

// versione minimale che non calcola i complex flag.
static void FaceBorderFromNone(MeshType &m)
{
  assert(HasPerFaceFlags(m));
	std::vector<EdgeSorter> e;
	typename UpdateMeshType::FaceIterator pf;
	typename std::vector<EdgeSorter>::iterator p;

	for(VertexIterator v=m.vert.begin();v!=m.vert.end();++v)
		(*v).ClearB();
		
	if( m.fn == 0 ) 
		return;

	e.resize(m.fn*3);								// Alloco il vettore ausiliario
	p = e.begin();
	for(pf=m.face.begin();pf!=m.face.end();++pf)			// Lo riempio con i dati delle facce
		if( ! (*pf).IsD() )
			for(int j=0;j<3;++j)
			{
				(*p).Set(&(*pf),j);
				(*pf).ClearB(j);
				++p;
			}
	assert(p==e.end());
	sort(e.begin(), e.end());							// Lo ordino per vertici
	 
	typename std::vector<EdgeSorter>::iterator pe,ps;
	ps = e.begin();pe=e.begin();
	do
	{	 
		if( pe==e.end() ||  *pe != *ps )					// Trovo blocco di edge uguali
		{
			if(pe-ps==1) 	{	
					ps->f->SetB(ps->z);
			} else
			if(pe-ps!=2)  {  // Caso complex!!
				for(;ps!=pe;++ps)
						ps->f->SetB(ps->z); // Si settano border anche i complex.
			} 
			ps = pe;
		}
		if(pe==e.end()) break;
		++pe;
	} while(true);
//	TRACE("found %i border (%i complex) on %i edges\n",nborder,ncomplex,ne);
}

/// Compute the PerVertex Border flag deriving it from the faces
static void VertexBorderFromFace(MeshType &m)
{
  assert(HasPerFaceFlags(m));
	typename MeshType::VertexIterator v;
	typename MeshType::FaceIterator f;

	for(v=m.vert.begin();v!=m.vert.end();++v)
		(*v).ClearB();

	for(f=m.face.begin();f!=m.face.end();++f)
    if(!(*f).IsD())
	    {
		    for(int z=0;z<3;++z)
			    if( (*f).IsB(z) )
			    {
				    (*f).V0(z)->SetB();
				    (*f).V1(z)->SetB();
			    }
	    }
}


}; // end class

/*@}*/
}	// End namespace tri
}	// End namespace vcg


#endif