1 // Copyright (C) 2007-2008 CEA/DEN, EDF R&D, OPEN CASCADE
3 // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
22 // SMESH SMESH : implementaion of SMESH idl descriptions
23 // File : StdMeshers_AutomaticLength.cxx
24 // Author : Edward AGAPOV, OCC
27 #include "StdMeshers_AutomaticLength.hxx"
29 #include "SMESH_Mesh.hxx"
30 #include "SMESHDS_Mesh.hxx"
31 #include "SMESH_Algo.hxx"
32 #include "SMESHDS_SubMesh.hxx"
34 #include "utilities.h"
36 #include <TopTools_IndexedMapOfShape.hxx>
39 #include <TopoDS_Edge.hxx>
43 //=============================================================================
47 //=============================================================================
49 StdMeshers_AutomaticLength::StdMeshers_AutomaticLength(int hypId, int studyId, SMESH_Gen * gen)
50 :SMESH_Hypothesis(hypId, studyId, gen)
52 _name = "AutomaticLength";
53 _param_algo_dim = 1; // is used by SMESH_Regular_1D
59 //=============================================================================
63 //=============================================================================
65 StdMeshers_AutomaticLength::~StdMeshers_AutomaticLength()
69 //================================================================================
72 * \param theFineness - The Fineness value [0.0-1.0],
76 * Raise if theFineness is out of range
77 * The "Initial Number of Elements on the Shortest Edge" (S0)
78 * is divided by (0.5 + 4.5 x theFineness)
80 //================================================================================
82 const double theCoarseConst = 0.5;
83 const double theFineConst = 4.5;
85 void StdMeshers_AutomaticLength::SetFineness(double theFineness)
86 throw(SALOME_Exception)
88 if ( theFineness < 0.0 || theFineness > 1.0 )
89 throw SALOME_Exception(LOCALIZED("theFineness is out of range [0.0-1.0]"));
91 if ( _fineness != theFineness )
93 NotifySubMeshesHypothesisModification();
94 _fineness = theFineness;
100 //================================================================================
102 * \brief Return pointer to TopoDS_TShape
103 * \param theShape - The TopoDS_Shape
104 * \retval inline const TopoDS_TShape* - result
106 //================================================================================
108 inline const TopoDS_TShape* getTShape(const TopoDS_Shape& theShape)
110 return theShape.TShape().operator->();
113 //================================================================================
115 * \brief computes segment length by S0 and edge length
117 //================================================================================
119 const double a14divPI = 14. / PI;
121 inline double segLength(double S0, double edgeLen, double minLen )
124 // S = S0 * f(L/Lmin) where f(x) = 1 + (2/Pi * 7 * atan(x/5) )
126 // S = S0 * ( 1 + 14/PI * atan( L / ( 5 * Lmin )))
127 return S0 * ( 1. + a14divPI * atan( edgeLen / ( 5 * minLen )));
130 //================================================================================
132 * \brief Compute segment length for all edges
133 * \param theMesh - The mesh
134 * \param theTShapeToLengthMap - The map of edge to segment length
136 //================================================================================
138 void computeLengths( SMESHDS_Mesh* aMesh,
139 map<const TopoDS_TShape*, double> & theTShapeToLengthMap,
143 theTShapeToLengthMap.clear();
145 TopoDS_Shape aMainShape = aMesh->ShapeToMesh();
147 // Find length of longest and shortest edge
148 double Lmin = DBL_MAX, Lmax = -DBL_MAX;
149 TopTools_IndexedMapOfShape edgeMap;
150 TopExp::MapShapes( aMainShape, TopAbs_EDGE, edgeMap);
151 for ( int i = 1; i <= edgeMap.Extent(); ++i )
153 TopoDS_Edge edge = TopoDS::Edge( edgeMap(i) );
154 //if ( BRep_Tool::Degenerated( edge )) continue;
156 Standard_Real L = SMESH_Algo::EdgeLength( edge );
157 if ( L < DBL_MIN ) continue;
159 if ( L > Lmax ) Lmax = L;
160 if ( L < Lmin ) Lmin = L;
162 // remember i-th edge length
163 theTShapeToLengthMap.insert( make_pair( getTShape( edge ), L ));
168 // image attached to PAL10237
182 const int NbSegMin = 5, NbSegMax = 10; // on axis NbSeg
183 const double Lrat1 = 1., Lrat2 = 10.; // on axis Lmax/Lmin
185 double Lratio = Lmax/Lmin;
186 double NbSeg = NbSegMin;
187 if ( Lratio < Lrat2 )
188 NbSeg += ( Lrat2 - Lratio ) / ( Lrat2 - Lrat1 ) * ( NbSegMax - NbSegMin );
190 double S0 = Lmin / (int) NbSeg;
191 MESSAGE( "S0 = " << S0 << ", Lmin = " << Lmin << ", Nbseg = " << (int) NbSeg);
193 // Compute segments length for all edges
194 map<const TopoDS_TShape*, double>::iterator tshape_length = theTShapeToLengthMap.begin();
195 for ( ; tshape_length != theTShapeToLengthMap.end(); ++tshape_length )
197 double & L = tshape_length->second;
198 L = segLength( S0, L, Lmin );
205 //=============================================================================
207 * \brief Computes segment length for an edge of given length
209 //=============================================================================
211 double StdMeshers_AutomaticLength::GetLength(const SMESH_Mesh* theMesh,
212 const double theEdgeLength)
213 throw(SALOME_Exception)
215 if ( !theMesh ) throw SALOME_Exception(LOCALIZED("NULL Mesh"));
217 SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* > ( theMesh )->GetMeshDS();
218 if ( theMesh != _mesh )
220 computeLengths( aMeshDS, _TShapeToLength, _S0, _minLen );
223 double L = segLength( _S0, theEdgeLength, _minLen );
224 return L / (theCoarseConst + theFineConst * _fineness);
227 //=============================================================================
231 //=============================================================================
233 double StdMeshers_AutomaticLength::GetLength(const SMESH_Mesh* theMesh,
234 const TopoDS_Shape& anEdge)
235 throw(SALOME_Exception)
237 if ( !theMesh ) throw SALOME_Exception(LOCALIZED("NULL Mesh"));
239 if ( anEdge.IsNull() || anEdge.ShapeType() != TopAbs_EDGE )
240 throw SALOME_Exception(LOCALIZED("Bad edge shape"));
242 if ( theMesh != _mesh )
244 SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* > ( theMesh )->GetMeshDS();
245 computeLengths( aMeshDS, _TShapeToLength, _S0, _minLen );
249 map<const TopoDS_TShape*, double>::iterator tshape_length =
250 _TShapeToLength.find( getTShape( anEdge ));
252 if ( tshape_length == _TShapeToLength.end() )
253 return 1; // it is a dgenerated edge
255 return tshape_length->second / (theCoarseConst + theFineConst * _fineness);
258 //=============================================================================
262 //=============================================================================
264 ostream & StdMeshers_AutomaticLength::SaveTo(ostream & save)
270 //=============================================================================
274 //=============================================================================
276 istream & StdMeshers_AutomaticLength::LoadFrom(istream & load)
278 if ( ! ( load >> _fineness ))
279 load.clear(ios::badbit | load.rdstate());
283 //=============================================================================
287 //=============================================================================
289 ostream & operator <<(ostream & save, StdMeshers_AutomaticLength & hyp)
291 return hyp.SaveTo( save );
294 //=============================================================================
298 //=============================================================================
300 istream & operator >>(istream & load, StdMeshers_AutomaticLength & hyp)
302 return hyp.LoadFrom( load );
305 //================================================================================
307 * \brief Initialize Fineness by the mesh built on the geometry
308 * \param theMesh - the built mesh
309 * \param theShape - the geometry of interest
310 * \retval bool - true if parameter values have been successfully defined
312 //================================================================================
314 bool StdMeshers_AutomaticLength::SetParametersByMesh(const SMESH_Mesh* theMesh,
315 const TopoDS_Shape& theShape)
317 if ( !theMesh || theShape.IsNull() )
322 SMESHDS_Mesh* aMeshDS = const_cast< SMESH_Mesh* >( theMesh )->GetMeshDS();
325 TopTools_IndexedMapOfShape edgeMap;
326 TopExp::MapShapes( theShape, TopAbs_EDGE, edgeMap );
327 for ( int i = 1; i <= edgeMap.Extent(); ++i )
329 const TopoDS_Edge& edge = TopoDS::Edge( edgeMap( i ));
331 // assure the base automatic length is stored in _TShapeToLength
333 GetLength( theMesh, edge );
335 // get current segment length
336 double L = SMESH_Algo::EdgeLength( edge );
339 SMESHDS_SubMesh * eSubMesh = aMeshDS->MeshElements( edge );
342 int nbSeg = eSubMesh->NbElements();
345 double segLen = L / nbSeg;
347 // get segment length from _TShapeToLength
348 map<const TopoDS_TShape*, double>::iterator tshape_length =
349 _TShapeToLength.find( getTShape( edge ));
350 if ( tshape_length == _TShapeToLength.end() )
352 double autoLen = tshape_length->second;
354 // segLen = autoLen / (theCoarseConst + theFineConst * _fineness) -->
355 _fineness += ( autoLen / segLen - theCoarseConst ) / theFineConst;
360 _fineness /= nbEdges;
364 else if (_fineness < 0.0)
370 //================================================================================
372 * \brief Initialize my parameter values by linear size of mesh element.
373 * \retval bool - true if parameter values have been successfully defined
375 //================================================================================
377 bool StdMeshers_AutomaticLength::SetParametersByElementSize(double elemLenght,
378 const SMESH_Mesh* theMesh)
382 // assure the base automatic length is stored in _TShapeToLength
383 // GetLength( theMesh, elemLenght );
385 // // find maximal edge length
386 // double maxLen = 0;
387 // map<const TopoDS_TShape*, double>::iterator
388 // tshape_length = _TShapeToLength.begin(), slEnd = _TShapeToLength.end();
389 // for ( ; tshape_length != slEnd; ++tshape_length )
390 // if ( tshape_length->second > maxLen )
391 // maxLen = tshape_length->second;
393 // // automatic length for longest element
394 // double autoLen = GetLength( theMesh, maxLen );
396 // // elemLenght = autoLen / (theCoarseConst + theFineConst * _fineness) -->
397 // _fineness = ( autoLen / elemLenght - theCoarseConst ) / theFineConst;