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133 | /* *****************************************************************
MESQUITE -- The Mesh Quality Improvement Toolkit
Copyright 2004 Sandia Corporation and Argonne National
Laboratory. Under the terms of Contract DE-AC04-94AL85000
with Sandia Corporation, the U.S. Government retains certain
rights in this software.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
(lgpl.txt) along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
[email protected], [email protected], [email protected],
[email protected], [email protected], [email protected]
***************************************************************** */
// -*- Mode : c++; tab-width: 3; c-tab-always-indent: t; indent-tabs-mode: nil; c-basic-offset: 3
// -*-
/*! \file IdealWeightInverseMeanRatio.hpp
Header file for the MBMesquite::IdealWeightInverseMeanRatio class
\author Michael Brewer
\author Thomas Leurent
\date 2002-06-19
*/
#ifndef IdealWeightInverseMeanRatio_hpp
#define IdealWeightInverseMeanRatio_hpp
#include "Mesquite.hpp"
#include "ElementQM.hpp"
#include "AveragingQM.hpp"
#include "Vector3D.hpp"
#include "Matrix3D.hpp"
#include "Exponent.hpp"
namespace MBMesquite
{
class MsqMeshEntity;
class PatchData;
class MsqError;
/*! \class IdealWeightInverseMeanRatio
\brief Computes the inverse mean ratio of given element.
The metric does not use the sample point functionality or the
compute_weighted_jacobian. It evaluates the metric at
the element vertices, and uses the isotropic ideal element.
Optionally, the metric computation can be raised to the
'pow_dbl' power. This does not necessarily raise the metric
value to the 'pow_dbl' power but instead raises each local
metric. For example, if the corner inverse mean ratios of a quadraliteral
element were m1,m2,m3, and m4 and we set pow_dbl=2 and
used linear averaging, the metric value would then be
m = .25(m1*m1 + m2*m2 + m3*m3 + m4*m4). The metric does
require a feasible region, and the metric needs to be minimized
if pow_dbl is greater than zero and maximized if pow_dbl
is less than zero. pow_dbl being equal to zero is invalid.
*/
class IdealWeightInverseMeanRatio : public ElementQM, public AveragingQM
{
public:
MESQUITE_EXPORT IdealWeightInverseMeanRatio( MsqError& err, double power = 1.0 );<--- Class 'IdealWeightInverseMeanRatio' has a constructor with 1 argument that is not explicit. [+]Class 'IdealWeightInverseMeanRatio' has a constructor with 1 argument that is not explicit. Such constructors should in general be explicit for type safety reasons. Using the explicit keyword in the constructor means some mistakes when using the class can be avoided.
MESQUITE_EXPORT IdealWeightInverseMeanRatio();
//! virtual destructor ensures use of polymorphism during destruction
MESQUITE_EXPORT virtual ~IdealWeightInverseMeanRatio() {}
virtual std::string get_name() const;
//! 1 if metric should be minimized, -1 if metric should be maximized.
virtual int get_negate_flag() const;
virtual bool evaluate( PatchData& pd, size_t handle, double& value, MsqError& err );
virtual bool evaluate_with_gradient( PatchData& pd,
size_t handle,
double& value,
std::vector< size_t >& indices,
std::vector< Vector3D >& gradient,
MsqError& err );
virtual bool evaluate_with_Hessian_diagonal( PatchData& pd,
size_t handle,
double& value,
std::vector< size_t >& indices,
std::vector< Vector3D >& gradient,
std::vector< SymMatrix3D >& Hessian,
MsqError& err );
virtual bool evaluate_with_Hessian( PatchData& pd,
size_t handle,
double& value,
std::vector< size_t >& indices,
std::vector< Vector3D >& gradient,
std::vector< Matrix3D >& Hessian,
MsqError& err );
private:
//! Sets the power value in the metric computation.
void set_metric_power( double pow_dbl, MsqError& err );
// arrays used in Hessian computations
// We allocate them here, so that one allocation only is done.
// This gives a big computation speed increase.
Vector3D mCoords[4]; // Vertex coordinates for the (decomposed) elements
Vector3D mGradients[32]; // Gradient of metric with respect to the coords
Matrix3D mHessians[80]; // Hessian of metric with respect to the coords
double mMetrics[8]; // Metric values for the (decomposed) elements
// variables used in the definition of the metric (2d and 3d)
double a2Con;
Exponent b2Con;
Exponent c2Con;
double a3Con;
Exponent b3Con;
Exponent c3Con;
};
} // namespace MBMesquite
#endif // IdealWeightInverseMeanRatio_hpp
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