From 3b932ed49d239d0b65279cdf91d16fa66906b41f Mon Sep 17 00:00:00 2001
From: eap <eap@opencascade.com>
Date: Wed, 26 Apr 2006 12:17:48 +0000
Subject: [PATCH] Add ConvertFromQuadratic()

---
 src/SMESH/SMESH_MeshEditor.cxx | 56 ++++++++++++++++++++++++++++++++++
 src/SMESH/SMESH_MeshEditor.hxx |  5 +++
 2 files changed, 61 insertions(+)

diff --git a/src/SMESH/SMESH_MeshEditor.cxx b/src/SMESH/SMESH_MeshEditor.cxx
index 8ac703787..ec4331f59 100644
--- a/src/SMESH/SMESH_MeshEditor.cxx
+++ b/src/SMESH/SMESH_MeshEditor.cxx
@@ -6023,6 +6023,62 @@ void SMESH_MeshEditor::ConvertToQuadratic(const bool theForce3d)
   delete aHelper;
 }
 
+//=======================================================================
+//function : ConvertFromQuadratic
+//purpose  :
+//=======================================================================
+bool  SMESH_MeshEditor::ConvertFromQuadratic()
+{
+  SMESHDS_Mesh* meshDS = GetMeshDS();
+  SMDS_ElemIteratorPtr aElemItr = meshDS->elementsIterator();
+  while(aElemItr->more())
+  {
+    const SMDS_MeshElement* elem = aElemItr->next();
+    if(elem)
+    {
+      if(!elem->IsQuadratic())
+        continue;
+      
+      int id = elem->GetID();
+
+      int nbNodes = elem->NbNodes();
+      vector<const SMDS_MeshNode *> aNds (nbNodes);
+
+      for(int i = 0; i < nbNodes; i++)
+      {
+	const SMDS_MeshNode* n = elem->GetNode(i);
+	if( elem->IsMediumNode( n ) )
+	  meshDS->SMDS_Mesh::RemoveFreeElement( n );	
+	else 
+	  aNds[i] = n;
+      }
+
+      SMDSAbs_ElementType aType = elem->GetType();      
+      RemoveElemFromGroups (elem, meshDS);
+      meshDS->SMDS_Mesh::RemoveFreeElement(elem);
+
+      SMDS_MeshElement * NewElem = 0;
+      switch(aType)
+      {
+        case SMDSAbs_Edge:
+	  NewElem = meshDS->AddEdgeWithID( ,id );
+	  break;
+	case SMDSAbs_Face:
+	  if( nbNds==3 )NewElem = meshDS->AddFaceWithID( ,id );
+	  if( nbNds==4 )NewElem = meshDS->AddFaceWithID( ,id );
+	  break;
+	case SMDSAbs_Volume:
+	  break;
+	default:
+	  break;
+      }
+
+      AddToSameGroups(NewElem, elem, meshDS);
+    }
+  }
+  return true;
+}
+
 //=======================================================================
 //function : SewSideElements
 //purpose  :
diff --git a/src/SMESH/SMESH_MeshEditor.hxx b/src/SMESH/SMESH_MeshEditor.hxx
index 3c41fe01a..bd284c574 100644
--- a/src/SMESH/SMESH_MeshEditor.hxx
+++ b/src/SMESH/SMESH_MeshEditor.hxx
@@ -344,6 +344,11 @@ class SMESH_MeshEditor {
   //converts all mesh to quadratic one, deletes old elements, replacing 
   //them with quadratic ones with the same id.
 
+  bool ConvertFromQuadratic();
+  //converts all mesh from quadratic to ordinary ones, deletes old quadratic elements, replacing 
+  //them with ordinary mesh elements with the same id.
+
+
 //  static int SortQuadNodes (const SMDS_Mesh * theMesh,
 //                            int               theNodeIds[] );
 //  // Set 4 nodes of a quadrangle face in a good order.
-- 
2.30.2