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// This file is part of ff3d - http://www.freefem.org/ff3d
// Copyright (C) 2001, 2002, 2003 Stphane 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: ScalarFunctionLinearBasis.hpp,v 1.3 2006/10/28 12:26:54 delpinux Exp $
#ifndef SCALAR_FUNCTION_LINEAR_BASIS_HPP
#define SCALAR_FUNCTION_LINEAR_BASIS_HPP
#include <ScalarFunctionBase.hpp>
/**
* @file ScalarFunctionLinearBasis.hpp
* @author Stephane Del Pino
* @date Thu Jul 20 01:42:18 2006
*
* @brief linear function canonical basis
*
*/
class ScalarFunctionLinearBasis
: public ScalarFunctionBase
{
public:
enum BasisType {
x,
y,
z
};
private:
const BasisType __basisType; /**< type of basis function */
/**
* Write the function to a stream
*
* @param os output stream
*
* @return os
*/
std::ostream& __put(std::ostream& os) const
{
switch (__basisType) {
case ScalarFunctionLinearBasis::x: {
os << 'x';
break;
}
case ScalarFunctionLinearBasis::y: {
os << 'y';
break;
}
case ScalarFunctionLinearBasis::z: {
os << 'z';
break;
}
}
return os;
}
public:
/**
* Evaluates the function at point @f$ X @f$
*
* @param X evaluation point
*
* @return @f$ X_i @f$
*/
real_t operator()(const TinyVector<3, real_t>& X) const
{
switch (__basisType) {
case ScalarFunctionLinearBasis::x: {
return X[0];
}
case ScalarFunctionLinearBasis::y: {
return X[1];
}
case ScalarFunctionLinearBasis::z: {
return X[2];
}
}
// never reached
return 0;
}
/**
* Checks if the function can be simplified
*
* @return false
*/
bool canBeSimplified() const
{
return false;
}
/**
* Constructor
*
* @param basisType basis function type
*/
ScalarFunctionLinearBasis(const BasisType& basisType)
: ScalarFunctionBase(ScalarFunctionBase::linearBasis),
__basisType(basisType)
{
;
}
/**
* Copy constructor
*
* @param f original function
*/
ScalarFunctionLinearBasis(const ScalarFunctionLinearBasis& f)
: ScalarFunctionBase(f),
__basisType(f.__basisType)
{
;
}
/**
* Destructor
*
*/
~ScalarFunctionLinearBasis()
{
;
}
};
#endif // SCALAR_FUNCTION_LINEAR_BASIS_HPP
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