108 lines
4.1 KiB
C++
108 lines
4.1 KiB
C++
/****************************************************************************
|
|
* 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 $
|
|
|
|
|
|
****************************************************************************/
|
|
|
|
#ifndef __VCGLIB_VERTEXALLOCATOR
|
|
#define __VCGLIB_VERTEXALLOCATOR
|
|
|
|
namespace vcg {
|
|
namespace vertex {
|
|
/** \addtogroup vertexmesh */
|
|
/*@{*/
|
|
/// Class to safely add vertexes and faces to a mesh updating all the involved pointers.
|
|
/// It provides static memeber to add either vertex or faces to a edgemesh.
|
|
template <class AllocateMeshType>
|
|
class Allocator
|
|
{
|
|
|
|
public:
|
|
typedef AllocateMeshType MeshType;
|
|
typedef typename MeshType::VertexType VertexType;
|
|
typedef typename MeshType::VertexPointer VertexPointer;
|
|
typedef typename MeshType::VertexIterator VertexIterator;
|
|
|
|
/** This class is used when allocating new vertexes and faces to update
|
|
the pointers that can be changed when resizing the involved vectors of vertex or faces.
|
|
It can also be used to prevent any update of the various mesh fields
|
|
(e.g. in case you are building all the connections by hand as in a importer);
|
|
*/
|
|
template<class SimplexPointerType>
|
|
class PointerUpdater
|
|
{
|
|
public:
|
|
void Clear(){newBase=oldBase=newEnd=oldEnd=0;preventUpdateFlag=false;};
|
|
void Update(SimplexPointerType &vp)
|
|
{
|
|
vp=newBase+(vp-oldBase);
|
|
}
|
|
bool NeedUpdate() {if(newBase!=oldBase && !preventUpdateFlag) return true; else return false;}
|
|
|
|
SimplexPointerType oldBase;
|
|
SimplexPointerType newBase;
|
|
SimplexPointerType newEnd;
|
|
SimplexPointerType oldEnd;
|
|
bool preventUpdateFlag; /// when true no update is considered necessary.
|
|
};
|
|
|
|
|
|
/** Function to safely add n vertices to a mesh.
|
|
|
|
@param m The mesh to be expanded
|
|
@param n the number of vertexes to be added
|
|
@param pu A PointerUpdater that stores the relocation that can be happened.
|
|
*/
|
|
static VertexIterator AddVertices(MeshType &m,int n, PointerUpdater<VertexPointer> &pu)
|
|
{
|
|
VertexIterator last=m.vert.end();
|
|
pu.Clear();
|
|
if(m.vert.empty()) pu.oldBase=0; // if the vector is empty we cannot find the last valid element
|
|
else pu.oldBase=&*m.vert.begin();
|
|
|
|
for(int i=0; i<n; ++i)
|
|
{
|
|
m.vert.push_back(MeshType::VertexType());
|
|
m.vert.back().ClearFlags();
|
|
}
|
|
|
|
m.vn+=n;
|
|
return last;// iterator to the first added vertex
|
|
}
|
|
|
|
static VertexIterator AddVertices(MeshType &m, int n)
|
|
{
|
|
PointerUpdater<VertexPointer> pu;
|
|
return AddVertices(m, n,pu);
|
|
}
|
|
}; // end class
|
|
/*@}*/
|
|
} // End Namespace TriMesh
|
|
} // End Namespace vcg
|
|
|
|
#endif
|