smesh/src/StdMeshers/StdMeshers_AutomaticLength.cxx

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// Copyright (C) 2007-2008 CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// 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.
//
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// 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.
//
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// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
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// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//
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// SMESH SMESH : implementaion of SMESH idl descriptions
// File : StdMeshers_AutomaticLength.cxx
// Author : Edward AGAPOV, OCC
// Module : SMESH
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//
#include "StdMeshers_AutomaticLength.hxx"
#include "SMESH_Mesh.hxx"
#include "SMESHDS_Mesh.hxx"
#include "SMESH_Algo.hxx"
#include "SMESHDS_SubMesh.hxx"
#include "utilities.h"
#include <TopTools_IndexedMapOfShape.hxx>
#include <TopExp.hxx>
#include <TopoDS.hxx>
#include <TopoDS_Edge.hxx>
using namespace std;
//=============================================================================
/*!
*
*/
//=============================================================================
StdMeshers_AutomaticLength::StdMeshers_AutomaticLength(int hypId, int studyId, SMESH_Gen * gen)
:SMESH_Hypothesis(hypId, studyId, gen)
{
_name = "AutomaticLength";
_param_algo_dim = 1; // is used by SMESH_Regular_1D
_mesh = 0;
_fineness = 0;
}
//=============================================================================
/*!
*
*/
//=============================================================================
StdMeshers_AutomaticLength::~StdMeshers_AutomaticLength()
{
}
//================================================================================
/*!
* \brief Set Fineness
* \param theFineness - The Fineness value [0.0-1.0],
* 0 - coarse mesh
* 1 - fine mesh
*
* Raise if theFineness is out of range
* The "Initial Number of Elements on the Shortest Edge" (S0)
* is divided by (0.5 + 4.5 x theFineness)
*/
//================================================================================
const double theCoarseConst = 0.5;
const double theFineConst = 4.5;
void StdMeshers_AutomaticLength::SetFineness(double theFineness)
throw(SALOME_Exception)
{
if ( theFineness < 0.0 || theFineness > 1.0 )
throw SALOME_Exception(LOCALIZED("theFineness is out of range [0.0-1.0]"));
if ( _fineness != theFineness )
{
NotifySubMeshesHypothesisModification();
_fineness = theFineness;
}
}
namespace {
//================================================================================
/*!
* \brief Return pointer to TopoDS_TShape
* \param theShape - The TopoDS_Shape
* \retval inline const TopoDS_TShape* - result
*/
//================================================================================
inline const TopoDS_TShape* getTShape(const TopoDS_Shape& theShape)
{
return theShape.TShape().operator->();
}
//================================================================================
/*!
* \brief computes segment length by S0 and edge length
*/
//================================================================================
const double a14divPI = 14. / PI;
inline double segLength(double S0, double edgeLen, double minLen )
{
// PAL10237
// S = S0 * f(L/Lmin) where f(x) = 1 + (2/Pi * 7 * atan(x/5) )
// =>
// S = S0 * ( 1 + 14/PI * atan( L / ( 5 * Lmin )))
return S0 * ( 1. + a14divPI * atan( edgeLen / ( 5 * minLen )));
}
//================================================================================
/*!
* \brief Compute segment length for all edges
* \param theMesh - The mesh
* \param theTShapeToLengthMap - The map of edge to segment length
*/
//================================================================================
void computeLengths( SMESHDS_Mesh* aMesh,
map<const TopoDS_TShape*, double> & theTShapeToLengthMap,
double & theS0,
double & theMinLen)
{
theTShapeToLengthMap.clear();
TopoDS_Shape aMainShape = aMesh->ShapeToMesh();
// Find length of longest and shortest edge
double Lmin = DBL_MAX, Lmax = -DBL_MAX;
TopTools_IndexedMapOfShape edgeMap;
TopExp::MapShapes( aMainShape, TopAbs_EDGE, edgeMap);
for ( int i = 1; i <= edgeMap.Extent(); ++i )
{
TopoDS_Edge edge = TopoDS::Edge( edgeMap(i) );
//if ( BRep_Tool::Degenerated( edge )) continue;
Standard_Real L = SMESH_Algo::EdgeLength( edge );
if ( L < DBL_MIN ) continue;
if ( L > Lmax ) Lmax = L;
if ( L < Lmin ) Lmin = L;
// remember i-th edge length
theTShapeToLengthMap.insert( make_pair( getTShape( edge ), L ));
}
// Compute S0
// image attached to PAL10237
// NbSeg
// ^
// |
// 10|\
// | \
// | \
// | \
// 5| --------
// |
// +------------>
// 1 10 Lmax/Lmin
const int NbSegMin = 5, NbSegMax = 10; // on axis NbSeg
const double Lrat1 = 1., Lrat2 = 10.; // on axis Lmax/Lmin
double Lratio = Lmax/Lmin;
double NbSeg = NbSegMin;
if ( Lratio < Lrat2 )
NbSeg += ( Lrat2 - Lratio ) / ( Lrat2 - Lrat1 ) * ( NbSegMax - NbSegMin );
double S0 = Lmin / (int) NbSeg;
MESSAGE( "S0 = " << S0 << ", Lmin = " << Lmin << ", Nbseg = " << (int) NbSeg);
// Compute segments length for all edges
map<const TopoDS_TShape*, double>::iterator tshape_length = theTShapeToLengthMap.begin();
for ( ; tshape_length != theTShapeToLengthMap.end(); ++tshape_length )
{
double & L = tshape_length->second;
L = segLength( S0, L, Lmin );
}
theS0 = S0;
theMinLen = Lmin;
}
}
//=============================================================================
/*!
* \brief Computes segment length for an edge of given length
*/
//=============================================================================
double StdMeshers_AutomaticLength::GetLength(const SMESH_Mesh* theMesh,
const double theEdgeLength)
throw(SALOME_Exception)
{
if ( !theMesh ) throw SALOME_Exception(LOCALIZED("NULL Mesh"));
SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* > ( theMesh )->GetMeshDS();
if ( theMesh != _mesh )
{
computeLengths( aMeshDS, _TShapeToLength, _S0, _minLen );
_mesh = theMesh;
}
double L = segLength( _S0, theEdgeLength, _minLen );
return L / (theCoarseConst + theFineConst * _fineness);
}
//=============================================================================
/*!
*
*/
//=============================================================================
double StdMeshers_AutomaticLength::GetLength(const SMESH_Mesh* theMesh,
const TopoDS_Shape& anEdge)
throw(SALOME_Exception)
{
if ( !theMesh ) throw SALOME_Exception(LOCALIZED("NULL Mesh"));
if ( anEdge.IsNull() || anEdge.ShapeType() != TopAbs_EDGE )
throw SALOME_Exception(LOCALIZED("Bad edge shape"));
if ( theMesh != _mesh )
{
SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* > ( theMesh )->GetMeshDS();
computeLengths( aMeshDS, _TShapeToLength, _S0, _minLen );
_mesh = theMesh;
}
map<const TopoDS_TShape*, double>::iterator tshape_length =
_TShapeToLength.find( getTShape( anEdge ));
if ( tshape_length == _TShapeToLength.end() )
return 1; // it is a dgenerated edge
return tshape_length->second / (theCoarseConst + theFineConst * _fineness);
}
//=============================================================================
/*!
*
*/
//=============================================================================
ostream & StdMeshers_AutomaticLength::SaveTo(ostream & save)
{
save << _fineness;
return save;
}
//=============================================================================
/*!
*
*/
//=============================================================================
istream & StdMeshers_AutomaticLength::LoadFrom(istream & load)
{
if ( ! ( load >> _fineness ))
load.clear(ios::badbit | load.rdstate());
return load;
}
//=============================================================================
/*!
*
*/
//=============================================================================
ostream & operator <<(ostream & save, StdMeshers_AutomaticLength & hyp)
{
return hyp.SaveTo( save );
}
//=============================================================================
/*!
*
*/
//=============================================================================
istream & operator >>(istream & load, StdMeshers_AutomaticLength & hyp)
{
return hyp.LoadFrom( load );
}
//================================================================================
/*!
* \brief Initialize Fineness by the mesh built on the geometry
* \param theMesh - the built mesh
* \param theShape - the geometry of interest
* \retval bool - true if parameter values have been successfully defined
*/
//================================================================================
bool StdMeshers_AutomaticLength::SetParametersByMesh(const SMESH_Mesh* theMesh,
const TopoDS_Shape& theShape)
{
if ( !theMesh || theShape.IsNull() )
return false;
_fineness = 0;
SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* >( theMesh )->GetMeshDS();
int nbEdges = 0;
TopTools_IndexedMapOfShape edgeMap;
TopExp::MapShapes( theShape, TopAbs_EDGE, edgeMap );
for ( int i = 1; i <= edgeMap.Extent(); ++i )
{
const TopoDS_Edge& edge = TopoDS::Edge( edgeMap( i ));
// assure the base automatic length is stored in _TShapeToLength
if ( i == 1 )
GetLength( theMesh, edge );
// get current segment length
double L = SMESH_Algo::EdgeLength( edge );
if ( L <= DBL_MIN )
continue;
SMESHDS_SubMesh * eSubMesh = aMeshDS->MeshElements( edge );
if ( !eSubMesh )
return false;
int nbSeg = eSubMesh->NbElements();
if ( nbSeg < 1 )
continue;
double segLen = L / nbSeg;
// get segment length from _TShapeToLength
map<const TopoDS_TShape*, double>::iterator tshape_length =
_TShapeToLength.find( getTShape( edge ));
if ( tshape_length == _TShapeToLength.end() )
continue;
double autoLen = tshape_length->second;
// segLen = autoLen / (theCoarseConst + theFineConst * _fineness) -->
_fineness += ( autoLen / segLen - theCoarseConst ) / theFineConst;
++nbEdges;
}
if ( nbEdges )
_fineness /= nbEdges;
if (_fineness > 1.0)
_fineness = 1.0;
else if (_fineness < 0.0)
_fineness = 0.0;
return nbEdges;
}
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//================================================================================
/*!
* \brief Initialize my parameter values by default parameters.
* \retval bool - true if parameter values have been successfully defined
*/
//================================================================================
bool StdMeshers_AutomaticLength::SetParametersByDefaults(const TDefaults& /*theDflts*/,
const SMESH_Mesh* /*theMesh*/)
{
return false;
// assure the base automatic length is stored in _TShapeToLength
// GetLength( theMesh, elemLenght );
// // find maximal edge length
// double maxLen = 0;
// map<const TopoDS_TShape*, double>::iterator
// tshape_length = _TShapeToLength.begin(), slEnd = _TShapeToLength.end();
// for ( ; tshape_length != slEnd; ++tshape_length )
// if ( tshape_length->second > maxLen )
// maxLen = tshape_length->second;
// // automatic length for longest element
// double autoLen = GetLength( theMesh, maxLen );
// // elemLenght = autoLen / (theCoarseConst + theFineConst * _fineness) -->
// _fineness = ( autoLen / elemLenght - theCoarseConst ) / theFineConst;
// return true;
}