+
+ if ( !aShape.IsNull() && _isShapeToMesh )
+ throw SALOME_Exception(LOCALIZED ("a shape to mesh has already been defined"));
+
+ // clear current data
+ if ( !_myMeshDS->ShapeToMesh().IsNull() )
+ {
+ // removal of a shape to mesh, delete objects referring to sub-shapes:
+ // - sub-meshes
+ std::map <int, SMESH_subMesh *>::iterator i_sm = _mapSubMesh.begin();
+ for ( ; i_sm != _mapSubMesh.end(); ++i_sm )
+ delete i_sm->second;
+ _mapSubMesh.clear();
+ // - groups on geometry
+ std::map <int, SMESH_Group *>::iterator i_gr = _mapGroup.begin();
+ while ( i_gr != _mapGroup.end() ) {
+ if ( dynamic_cast<SMESHDS_GroupOnGeom*>( i_gr->second->GetGroupDS() )) {
+ _myMeshDS->RemoveGroup( i_gr->second->GetGroupDS() );
+ delete i_gr->second;
+ _mapGroup.erase( i_gr++ );
+ }
+ else
+ i_gr++;
+ }
+ _mapAncestors.Clear();
+
+ // clear SMESHDS
+ TopoDS_Shape aNullShape;
+ _myMeshDS->ShapeToMesh( aNullShape );
+ }
+
+ // set a new geometry
+ if ( !aShape.IsNull() )
+ {
+ _myMeshDS->ShapeToMesh(aShape);
+ _isShapeToMesh = true;
+
+ // fill _mapAncestors
+ int desType, ancType;
+ for ( desType = TopAbs_VERTEX; desType > TopAbs_COMPOUND; desType-- )
+ for ( ancType = desType - 1; ancType >= TopAbs_COMPOUND; ancType-- )
+ TopExp::MapShapesAndAncestors ( aShape,
+ (TopAbs_ShapeEnum) desType,
+ (TopAbs_ShapeEnum) ancType,
+ _mapAncestors );
+ }
+}
+
+//=======================================================================
+/*!
+ * \brief Return geometry to be meshed. (It may be a PseudoShape()!)
+ */
+//=======================================================================
+
+TopoDS_Shape SMESH_Mesh::GetShapeToMesh() const
+{
+ return _myMeshDS->ShapeToMesh();
+}
+
+//=======================================================================
+/*!
+ * \brief Return a solid which is returned by GetShapeToMesh() if
+ * a real geometry to be meshed was not set
+ */
+//=======================================================================
+
+const TopoDS_Solid& SMESH_Mesh::PseudoShape()
+{
+ static TopoDS_Solid aSolid;
+ if ( aSolid.IsNull() )
+ {
+ aSolid = BRepPrimAPI_MakeBox(1,1,1);
+ }
+ return aSolid;
+}
+
+//=======================================================================
+/*!
+ * \brief Remove all nodes and elements
+ */
+//=======================================================================
+
+void SMESH_Mesh::Clear()
+{
+ // clear mesh data
+ _myMeshDS->ClearMesh();
+
+ // update compute state of submeshes
+ if ( SMESH_subMesh *sm = GetSubMeshContaining( GetShapeToMesh() ) ) {
+ SMESH_subMeshIteratorPtr smIt = sm->getDependsOnIterator(/*includeSelf=*/true,
+ /*complexShapeFirst=*/false);
+ while ( smIt->more() ) {
+ sm = smIt->next();
+ sm->ComputeStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
+ }
+ }
+
+// // clear sub-meshes; get ready to re-compute as a side-effect
+
+// if ( SMESH_subMesh *sm = GetSubMeshContaining( GetShapeToMesh() ) )
+// {
+// SMESH_subMeshIteratorPtr smIt = sm->getDependsOnIterator(/*includeSelf=*/true,
+// /*complexShapeFirst=*/false);
+// while ( smIt->more() )
+// {
+// sm = smIt->next();
+// TopAbs_ShapeEnum shapeType = sm->GetSubShape().ShapeType();
+// if ( shapeType == TopAbs_VERTEX || shapeType < TopAbs_SOLID )
+// // all other shapes depends on vertices so they are already cleaned
+// sm->ComputeStateEngine( SMESH_subMesh::CLEAN );
+// // to recompute even if failed
+// sm->ComputeStateEngine( SMESH_subMesh::CHECK_COMPUTE_STATE );
+// }
+// }
+
+// // clear entities not on sub-meshes
+
+// SMDS_VolumeIteratorPtr vIt = _myMeshDS->volumesIterator();
+// while ( vIt->more() )
+// _myMeshDS->RemoveFreeElement( vIt->next(), 0 );
+
+// SMDS_FaceIteratorPtr fIt = _myMeshDS->facesIterator();
+// while ( fIt->more() )
+// _myMeshDS->RemoveFreeElement( fIt->next(), 0 );
+
+// SMDS_EdgeIteratorPtr eIt = _myMeshDS->edgesIterator();
+// while ( eIt->more() )
+// _myMeshDS->RemoveFreeElement( eIt->next(), 0 );
+
+// SMDS_NodeIteratorPtr nIt = _myMeshDS->nodesIterator();
+// while ( nIt->more() ) {
+// const SMDS_MeshNode * node = nIt->next();
+// if ( node->NbInverseElements() == 0 )
+// _myMeshDS->RemoveFreeNode( node, 0 );
+// else
+// _myMeshDS->RemoveNode(node);
+// }