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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2005 Stephane Del Pino
//
// 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, 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 for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software Foundation,
// Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
//
// $Id: NormalManager.hpp,v 1.3 2007/05/20 23:02:47 delpinux Exp $
#ifndef NORMAL_MANAGER_HPP
#define NORMAL_MANAGER_HPP
#include <ThreadStaticBase.hpp>
#include <SurfElem.hpp>
#include <DiscretizationType.hpp>
#include <ReferenceCounting.hpp>
/**
* @file NormalManager.hpp
* @author Stephane Del Pino
* @date Sun Oct 30 23:48:45 2005
*
* @brief Manages normal
*
* This class manages the current normal of when iterating over
* surface elements. This implementation is very simple and consideres
* that the normal is evaluated over one surface element at once,
* which seems quite natural.
*/
class NormalManager
: public ThreadStaticBase<NormalManager>
{
private:
const SurfElem* __surfElem; /**< The current surface element */
size_t __counter; /**< counts the current number of subscriptions */
mutable ReferenceCounting<TinyVector<3, real_t> >
__normal; /**< This vector contains the normal vector */
/**
* Builds the normal vector if it is not built
*
*/
void __buildNormal() const
{
if (__surfElem == 0) {
throw ErrorHandler(__FILE__,__LINE__,
"Cannot evaluate normal, no surface is defined",
ErrorHandler::unexpected);
}
if (__normal == 0) {
__normal = new TinyVector<3, real_t>(__surfElem->normal());
}
}
public:
/**
* Subscribes the element @a s for whom the normal may be computed.
*
* @param s the element to subscribe
*/
void subscribe(const SurfElem* s)
{
__counter++;
__surfElem = s;
}
/**
* Uses a new surface element
*
* @param s the new surface element
*/
void update(const SurfElem* s)
{
ASSERT(__surfElem != 0);
__surfElem = s;
__normal = 0; // normal is to recompute
}
/**
* This is called to inform the NormalManager that the surface have
* been iterated, this avoid the use of wrong normal value
*/
void unsubscribe()
{
ASSERT(__counter != 0);
__counter--;
if (__counter == 0) {
__surfElem = 0;
__normal = 0;
}
}
/**
* Access to the first component of the normal
*
* @return \f$ n_x \f$
*/
real_t nx() const
{
__buildNormal();
return (*__normal)[0];
}
/**
* Access to the second component of the normal
*
* @return \f$ n_y \f$
*/
real_t ny() const
{
__buildNormal();
return (*__normal)[1];
}
/**
* Access to the third component of the normal
*
* @return \f$ n_z \f$
*/
real_t nz() const
{
__buildNormal();
return (*__normal)[2];
}
/**
* Default constructor
*
*/
explicit NormalManager()
: __surfElem(0),
__counter(0),
__normal(0)
{
;
}
/**
* Destructor
*
*/
~NormalManager()
{
ASSERT(__counter == 0);
ASSERT(__surfElem == 0);
ASSERT(__normal == 0);
}
};
#endif // NORMAL_MANAGER_HPP
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