--- /dev/null
+// File: GeomAlgoAPI_SketchBuilder.cpp
+// Created: 02 Jun 2014
+// Author: Artem ZHIDKOV
+
+#include <GeomAlgoAPI_SketchBuilder.h>
+
+#include <set>
+
+#include <gp_Dir.hxx>
+
+#include <BOPAlgo_Builder.hxx>
+#include <BOPAlgo_Operation.hxx>
+#include <BOPAlgo_PaveFiller.hxx>
+#include <BOPTools.hxx>
+#include <BRep_Builder.hxx>
+#include <BRep_Curve3D.hxx>
+#include <BRep_TEdge.hxx>
+#include <BRep_TVertex.hxx>
+#include <BRepAlgoAPI_Cut.hxx>
+#include <BRepBuilderAPI_MakeFace.hxx>
+#include <Geom_Curve.hxx>
+#include <TopExp_Explorer.hxx>
+#include <TopoDS_Edge.hxx>
+#include <TopoDS_Face.hxx>
+#include <TopoDS_Vertex.hxx>
+#include <TopoDS_Wire.hxx>
+#include <TopOpeBRepTool_ShapeClassifier.hxx>
+
+#include <Precision.hxx>
+const double tolerance = Precision::Confusion();
+
+/// \brief Search first vertex - the vertex with lowest x coordinate, which is used in 2 edges at least
+static const TopoDS_Shape& findStartVertex(
+ const BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE,
+ const gp_Dir& theDirX, const gp_Dir& theDirY);
+
+/// \brief Search the vertex on the sketch candidate to be the next one in the loop
+static void findNextVertex(
+ const TopoDS_Shape& theStartVertex,
+ const BOPCol_IndexedDataMapOfShapeListOfShape& theVertexEdgeMap,
+ const gp_Dir& theStartDir,
+ const gp_Dir& theNormal,
+ TopoDS_Shape& theNextVertex,
+ TopoDS_Shape& theNextEdge,
+ gp_Dir& theNextDir);
+
+/// \brief Create planar face using the edges surrounding it
+static void createFace(const TopoDS_Shape& theStartVertex,
+ const std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ TopoDS_Face& theResFace);
+
+/// \bief Create planar wire
+static void createWireList(const TopoDS_Shape& theStartVertex,
+ const std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ const std::set<Handle(TopoDS_TShape)>& theEdgesInLoops,
+ std::list<TopoDS_Wire>& theResWires);
+
+/// \brief Calculate outer tengency on the edge in specified vertex
+static gp_Dir getOuterEdgeDirection(const TopoDS_Shape& theEdge,
+ const TopoDS_Shape& theVertex);
+
+/// \brief Unnecessary edges will be removed from the map.
+/// Positions of iterator will be updated
+static void removeWasteEdges(
+ std::list<TopoDS_Shape>::iterator& theStartVertex,
+ std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfVertexes,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE);
+
+
+
+
+void GeomAlgoAPI_SketchBuilder::createFaces(
+ const boost::shared_ptr<GeomAPI_Dir>& theDirX,
+ const boost::shared_ptr<GeomAPI_Dir>& theDirY,
+ const boost::shared_ptr<GeomAPI_Dir>& theNorm,
+ const std::list< boost::shared_ptr<GeomAPI_Shape> >& theFeatures,
+ std::list< boost::shared_ptr<GeomAPI_Shape> >& theResultFaces,
+ std::list< boost::shared_ptr<GeomAPI_Shape> >& theResultWires)
+{
+ // Create the list of edges with shared vertexes
+ BOPAlgo_Builder aBuilder;
+ BOPAlgo_PaveFiller aPF;
+
+ std::list< boost::shared_ptr<GeomAPI_Shape> >::const_iterator anIt = theFeatures.begin();
+ for (; anIt != theFeatures.end(); anIt++)
+ {
+ boost::shared_ptr<GeomAPI_Shape> aPreview(*anIt);
+ aBuilder.AddArgument(aPreview->impl<TopoDS_Edge>());
+ }
+ aPF.SetArguments(aBuilder.Arguments());
+ aPF.Perform();
+ int aErr = aPF.ErrorStatus();
+ if (aErr) return ;
+ aBuilder.PerformWithFiller(aPF);
+ aErr = aBuilder.ErrorStatus();
+ if (aErr) return ;
+
+ BOPCol_IndexedDataMapOfShapeListOfShape aMapVE; // map between vertexes and edges
+ BOPTools::MapShapesAndAncestors(aBuilder.Shape(), TopAbs_VERTEX, TopAbs_EDGE, aMapVE);
+
+ gp_Dir aDirX = theDirX->impl<gp_Dir>();
+ gp_Dir aDirY = theDirY->impl<gp_Dir>();
+ gp_Dir aNorm = theNorm->impl<gp_Dir>();
+
+ // Set of edges used in loops
+ std::set<Handle(TopoDS_TShape)> anEdgesInLoops;
+ // Lists for processed vertexes and edges
+ std::list<TopoDS_Shape> aProcVertexes;
+ std::list<TopoDS_Shape> aProcEdges;
+
+ // Search the start vertex
+ TopoDS_Shape aStartVertex = findStartVertex(aMapVE, aDirX, aDirY);
+ aProcVertexes.push_back(aStartVertex);
+
+ TopoDS_Shape aCurVertex = aStartVertex;
+ gp_Dir aCurDir = aDirY;
+ gp_Dir aCurNorm = aNorm.Reversed();
+
+ // Go through the edges and find loops
+ TopoDS_Shape aNextVertex;
+ TopoDS_Shape aBindingEdge;
+ gp_Dir aNextDir;
+ while (aMapVE.Extent() > 0)
+ {
+ findNextVertex(aCurVertex, aMapVE, aCurDir, aCurNorm, aNextVertex, aBindingEdge, aNextDir);
+ aCurNorm = aNorm;
+
+ // Try to find next vertex in the list of already processed
+ std::list<TopoDS_Shape>::iterator aVertIter = aProcVertexes.begin();
+ std::list<TopoDS_Shape>::iterator anEdgeIter = aProcEdges.begin();
+ for ( ; aVertIter != aProcVertexes.end(); aVertIter++)
+ {
+ if (aVertIter->TShape() == aNextVertex.TShape())
+ break;
+ if (anEdgeIter != aProcEdges.end())
+ anEdgeIter++;
+ }
+
+ aProcVertexes.push_back(aNextVertex);
+ aProcEdges.push_back(aBindingEdge);
+
+ // The loop was found
+ if (aVertIter != aProcVertexes.end())
+ {
+ if (aVertIter != aProcVertexes.begin())
+ {
+ // Check the orientation of the loop
+ Handle(BRep_TVertex) aVert = Handle(BRep_TVertex)::DownCast(aVertIter->TShape());
+ const gp_Pnt& aCurPnt = aVert->Pnt();
+ aVert = Handle(BRep_TVertex)::DownCast((++aVertIter)->TShape());
+ aVertIter--;
+ const gp_Pnt& aNextPnt = aVert->Pnt();
+ std::list<TopoDS_Shape>::reverse_iterator anItBeforeLast = aProcVertexes.rbegin();
+ aVert = Handle(BRep_TVertex)::DownCast((++anItBeforeLast)->TShape()); // get the vertex before last one, because the last duplicates the start of loop
+ const gp_Pnt& aPrevPnt = aVert->Pnt();
+ gp_Vec aCN(aCurPnt, aNextPnt);
+ gp_Vec aCP(aCurPnt, aPrevPnt);
+ if (aCN.DotCross(aCP, gp_Vec(aNorm)) < -tolerance)
+ {
+ // The found loop has wrong orientation and may contain sub-loops.
+ // Need to check it onle again with another initial direction.
+ aCurVertex = *aVertIter;
+ do {
+ aProcVertexes.pop_back();
+ aProcEdges.pop_back();
+ } while (aCurVertex != aProcVertexes.back());
+ aCurDir = getOuterEdgeDirection(aProcEdges.back(), aCurVertex);
+ aCurNorm = aNorm.Reversed();
+ continue;
+ }
+ }
+
+ // When the orientation is correct or the edges looped through
+ // the first element, create new face and remove unnecessary edges.
+ TopoDS_Face aPatch;
+ createFace(*aVertIter, anEdgeIter, aProcEdges.end(), aPatch);
+ if (!aPatch.IsNull())
+ {
+ boost::shared_ptr<GeomAPI_Shape> aFace(new GeomAPI_Shape);
+ aFace->setImpl(new TopoDS_Shape(aPatch));
+ theResultFaces.push_back(aFace);
+ }
+ // push the edges used in the loop to the map
+ std::list<TopoDS_Shape>::iterator anIter;
+ for (anIter = anEdgeIter; anIter != aProcEdges.end(); anIter++)
+ anEdgesInLoops.insert(anIter->TShape());
+ // remove unnecessary edges
+ std::list<TopoDS_Shape>::iterator aCopyVLoop = aVertIter;
+ std::list<TopoDS_Shape>::iterator aCopyELoop = anEdgeIter;
+ removeWasteEdges(aVertIter, anEdgeIter, aProcVertexes.end(), aProcEdges.end(), aMapVE);
+
+ // revert the list of remaining edges
+ std::list<TopoDS_Shape> aRemainVertexes;
+ for ( ; aVertIter != aProcVertexes.end(); aVertIter++)
+ aRemainVertexes.push_front(*aVertIter);
+ std::list<TopoDS_Shape> aRemainEdges;
+ for ( ; anEdgeIter != aProcEdges.end(); anEdgeIter++)
+ aRemainEdges.push_front(*anEdgeIter);
+ // remove edges and vertexes used in the loop and add remaining ones
+ aProcVertexes.erase(aCopyVLoop, aProcVertexes.end());
+ aProcVertexes.insert(aProcVertexes.end(), aRemainVertexes.begin(), aRemainVertexes.end());
+ aProcEdges.erase(aCopyELoop, aProcEdges.end());
+ aProcEdges.insert(aProcEdges.end(), aRemainEdges.begin(), aRemainEdges.end());
+
+ // Recalculate current vertex and current direction
+ if (!aProcVertexes.empty())
+ {
+ aNextVertex = aProcVertexes.back();
+ if (!aProcEdges.empty())
+ aNextDir = getOuterEdgeDirection(aProcEdges.back(), aNextVertex);
+ else aNextDir = -aDirY;
+ }
+ }
+
+ // if next vertex connected only to alone edge, this is a part of wire (not a closed loop),
+ // we need to go back through the list of already checked edges to find a branching vertex
+ if (!aMapVE.IsEmpty() && aMapVE.Contains(aNextVertex) &&
+ aMapVE.FindFromKey(aNextVertex).Size() == 1)
+ {
+ std::list<TopoDS_Shape>::reverse_iterator aVRIter = aProcVertexes.rbegin();
+ std::list<TopoDS_Shape>::reverse_iterator aERIter = aProcEdges.rbegin();
+ for (++aERIter, ++aVRIter; aERIter != aProcEdges.rend(); aERIter++, aVRIter++)
+ if (aMapVE.FindFromKey(*aVRIter).Size() > 2)
+ break;
+ if (aERIter != aProcEdges.rend() || aMapVE.FindFromKey(*aVRIter).Size() == 1)
+ { // the branching vertex was found or current list of edges is a wire without branches
+ std::list<TopoDS_Shape>::iterator aEIter;
+ TopoDS_Shape aCurEdge;
+ if (aERIter != aProcEdges.rend())
+ {
+ aEIter = aERIter.base();
+ aCurEdge = *aERIter;
+ }
+ else
+ aEIter = aProcEdges.begin();
+ std::list<TopoDS_Wire> aTail;
+ createWireList(*aVRIter, aEIter, aProcEdges.end(), anEdgesInLoops, aTail);
+ std::list<TopoDS_Wire>::const_iterator aTailIter = aTail.begin();
+ for ( ; aTailIter != aTail.end(); aTailIter++)
+ if (!aTailIter->IsNull())
+ {
+ boost::shared_ptr<GeomAPI_Shape> aWire(new GeomAPI_Shape);
+ aWire->setImpl(new TopoDS_Shape(*aTailIter));
+ theResultWires.push_back(aWire);
+ }
+ std::list<TopoDS_Shape>::iterator aVIter = aVRIter.base();
+ std::list<TopoDS_Shape>::iterator aEItCopy = aEIter;
+ removeWasteEdges(--aVIter, aEItCopy, aProcVertexes.end(), aProcEdges.end(), aMapVE);
+
+ aProcEdges.erase(aEIter, aProcEdges.end());
+ aVIter = aVRIter.base();
+ aProcVertexes.erase(aVIter, aProcVertexes.end());
+
+ if (!aProcVertexes.empty())
+ {
+ aNextVertex = aProcVertexes.back();
+ if (!aCurEdge.IsNull())
+ aNextDir = getOuterEdgeDirection(aCurEdge, aNextVertex);
+ }
+ }
+ else
+ { // there is no branching vertex in the list of proceeded,
+ // so we should revert the list and go the opposite way
+ aProcVertexes.reverse();
+ aProcEdges.reverse();
+ aNextVertex = aProcVertexes.back();
+ aNextDir = getOuterEdgeDirection(aProcEdges.back(), aNextVertex);
+ }
+ }
+
+ // When all edges of current component of connectivity are processed,
+ // we should repeat procedure for finding initial vertex in the remaining
+ if (!aMapVE.IsEmpty() && !aMapVE.Contains(aNextVertex))
+ {
+ aProcVertexes.clear();
+ aProcEdges.clear();
+
+ TopoDS_Shape aStartEdge;
+ aStartVertex = findStartVertex(aMapVE, aDirX, aDirY);
+ aProcVertexes.push_back(aStartVertex);
+ findNextVertex(aStartVertex, aMapVE, aDirY, aNorm.Reversed(), aNextVertex, aStartEdge, aNextDir);
+ aProcVertexes.push_back(aNextVertex);
+ aProcEdges.push_back(aStartEdge);
+ }
+
+ aCurVertex = aNextVertex;
+ aCurDir = aNextDir;
+ }
+
+ if (theResultFaces.size() > 1)
+ fixIntersections(theResultFaces);
+}
+
+void GeomAlgoAPI_SketchBuilder::fixIntersections(
+ std::list< boost::shared_ptr<GeomAPI_Shape> >& theFaces)
+{
+//// TopOpeBRepTool_ShapeClassifier aClassifier;
+//// const int aSameDomain = 1;
+////
+//// std::list< boost::shared_ptr<GeomAPI_Shape> >::iterator anIter1 = theFaces.begin();
+//// std::list< boost::shared_ptr<GeomAPI_Shape> >::iterator anIter2;
+//// for ( ; anIter1 != theFaces.end(); anIter1++)
+//// {
+//// anIter2 = anIter1;
+//// for (++anIter2; anIter2 != theFaces.end(); anIter2++)
+//// {
+//// TopAbs_State aState = aClassifier.StateShapeShape(
+//// (*anIter1)->impl<TopoDS_Shape>(), (*anIter2)->impl<TopoDS_Shape>(), aSameDomain);
+//// if (aState == TopAbs_IN)
+//// { // second shape should be cut from the first
+//// BRepAlgoAPI_Cut aCut((*anIter1)->impl<TopoDS_Shape>(),
+//// (*anIter2)->impl<TopoDS_Shape>());
+//// (*anIter1)->setImpl(new TopoDS_Shape(aCut.Shape()));
+//// }
+//// else if (aState != TopAbs_OUT)
+//// { // change the shapes order and repeat
+//// aState = aClassifier.StateShapeShape(
+//// (*anIter2)->impl<TopoDS_Shape>(), (*anIter1)->impl<TopoDS_Shape>(), aSameDomain);
+//// if (aState == TopAbs_IN)
+//// { // first shape should be cut from the second
+//// BRepAlgoAPI_Cut aCut((*anIter2)->impl<TopoDS_Shape>(),
+//// (*anIter1)->impl<TopoDS_Shape>());
+//// (*anIter2)->setImpl(new TopoDS_Shape(aCut.Shape()));
+//// }
+//// }
+//// }
+//// }
+}
+
+
+// =================== Auxiliary functions ====================================
+const TopoDS_Shape& findStartVertex(
+ const BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE,
+ const gp_Dir& theDirX, const gp_Dir& theDirY)
+{
+ int aStartVertexInd = 1;
+ double aMinX = DBL_MAX;
+ double aMinY = DBL_MAX;
+ int aNbVert = theMapVE.Extent();
+ for (int i = 1; i <= aNbVert; i++)
+ {
+ const TopoDS_Vertex& aV = (const TopoDS_Vertex&)theMapVE.FindKey(i);
+ const Handle(BRep_TVertex)& aVert = (const Handle(BRep_TVertex)&)aV.TShape();
+ const gp_Pnt& aVertPnt = aVert->Pnt();
+
+ double aX = aVertPnt.XYZ().Dot(theDirX.XYZ());
+ double aY = aVertPnt.XYZ().Dot(theDirY.XYZ());
+ if ((aX < aMinX || (fabs(aX - aMinX) < tolerance && aY < aMinY)) &&
+ theMapVE.FindFromIndex(i).Extent() > 1)
+ {
+ aMinX = aX;
+ aMinY = aY;
+ aStartVertexInd = i;
+ }
+ }
+ return theMapVE.FindKey(aStartVertexInd);
+}
+
+void findNextVertex(
+ const TopoDS_Shape& theStartVertex,
+ const BOPCol_IndexedDataMapOfShapeListOfShape& theVertexEdgeMap,
+ const gp_Dir& theStartDir,
+ const gp_Dir& theNormal,
+ TopoDS_Shape& theNextVertex,
+ TopoDS_Shape& theNextEdge,
+ gp_Dir& theNextDir)
+{
+ const BOPCol_ListOfShape& anEdgesList = theVertexEdgeMap.FindFromKey(theStartVertex);
+ BOPCol_ListOfShape::Iterator aEdIter(anEdgesList);
+ double aBestEdgeProj = DBL_MAX;
+ for ( ; aEdIter.More(); aEdIter.Next())
+ {
+ gp_Dir aTang = getOuterEdgeDirection(aEdIter.Value(), theStartVertex);
+ aTang.Reverse();
+
+ // The projection is normalized in segment (-1, 1),
+ // where (-1, 0] corresponds to the angles (pi/2, 0] between theStartDir and aTang
+ // and [0, 1) corresponds to the angles [0, -pi/2)
+ double aProj = (aTang.Dot(theStartDir) - 1.0) * 0.5;
+ if (fabs(fabs(aProj) - 1) < tolerance)
+ continue;
+ if (theStartDir.DotCross(aTang, theNormal) < tolerance)
+ aProj *= -1.0;
+
+ if (aProj < aBestEdgeProj)
+ {
+ aBestEdgeProj = aProj;
+ theNextEdge = aEdIter.Value();
+ TopExp_Explorer aVertExp(theNextEdge, TopAbs_VERTEX);
+ for ( ; aVertExp.More(); aVertExp.Next())
+ if (aVertExp.Current().TShape() != theStartVertex.TShape())
+ {
+ theNextVertex = aVertExp.Current();
+ theNextDir = getOuterEdgeDirection(aEdIter.Value(), theNextVertex);
+ break;
+ }
+ }
+ }
+}
+
+static void addEdgeToWire(const TopoDS_Edge& theEdge,
+ const BRep_Builder& theBuilder,
+ TopoDS_Shape& theSpliceVertex,
+ TopoDS_Wire& theWire)
+{
+ bool isCurVertChanged = false;
+ TopoDS_Shape aCurVertChanged;
+
+ TopExp_Explorer aVertExp(theEdge, TopAbs_VERTEX);
+ for ( ; aVertExp.More(); aVertExp.Next())
+ {
+ const TopoDS_Shape& aVertex = aVertExp.Current();
+ if (aVertex.TShape() == theSpliceVertex.TShape() &&
+ aVertex.Orientation() != theEdge.Orientation())
+ { // Current vertex is the last for the edge, so its orientation is wrong, need to revert the edge
+ const Handle(BRep_TEdge)& aTEdge = (const Handle(BRep_TEdge)&)theEdge.TShape();
+ Handle(BRep_Curve3D) aEdgeCurve =
+ Handle(BRep_Curve3D)::DownCast(aTEdge->Curves().First());
+ Handle(Geom_Curve) aCurve = aEdgeCurve->Curve3D();
+ aCurve->Reverse();
+
+ theBuilder.UpdateEdge(theEdge, aCurve, aTEdge->Tolerance());
+ break;
+ }
+ if (aVertex.TShape() != theSpliceVertex.TShape())
+ {
+ aCurVertChanged = aVertex;
+ isCurVertChanged = true;
+ }
+ }
+ theSpliceVertex = isCurVertChanged ? aCurVertChanged : aVertExp.Current();
+
+ theBuilder.Add(theWire, theEdge);
+}
+
+void createFace(const TopoDS_Shape& theStartVertex,
+ const std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ TopoDS_Face& theResFace)
+{
+ TopoDS_Wire aResWire;
+ BRep_Builder aBuilder;
+ aBuilder.MakeWire(aResWire);
+
+ TopoDS_Shape aCurVertex = theStartVertex;
+ std::list<TopoDS_Shape>::const_iterator anEdgeIter = theStartEdge;
+ for ( ; anEdgeIter != theEndOfEdges; anEdgeIter++)
+ {
+ TopoDS_Edge anEdge = *((TopoDS_Edge*)(&(*anEdgeIter)));
+ addEdgeToWire(anEdge, aBuilder, aCurVertex, aResWire);
+ }
+
+ BRepBuilderAPI_MakeFace aFaceBuilder(aResWire, Standard_True/*planar face*/);
+ if (aFaceBuilder.Error() == BRepBuilderAPI_FaceDone)
+ theResFace = aFaceBuilder.Face();
+}
+
+void createWireList(const TopoDS_Shape& theStartVertex,
+ const std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ const std::set<Handle(TopoDS_TShape)>& theEdgesInLoops,
+ std::list<TopoDS_Wire>& theResWires)
+{
+ BRep_Builder aBuilder;
+ bool needNewWire = true;
+ TopoDS_Shape aCurVertex = theStartVertex;
+
+ std::list<TopoDS_Shape>::iterator anIter = theStartEdge;
+ while (anIter != theEndOfEdges)
+ {
+ while (anIter != theEndOfEdges && needNewWire &&
+ theEdgesInLoops.count(anIter->TShape()) != 0)
+ {
+ TopExp_Explorer aVertExp(*anIter, TopAbs_VERTEX);
+ for ( ; aVertExp.More(); aVertExp.Next())
+ if (aVertExp.Current().TShape() != aCurVertex.TShape())
+ {
+ aCurVertex = aVertExp.Current();
+ break;
+ }
+ anIter++;
+ }
+ if (anIter == theEndOfEdges)
+ break;
+
+ if (needNewWire)
+ { // The new wire should be created
+ TopoDS_Wire aWire;
+ aBuilder.MakeWire(aWire);
+ theResWires.push_back(aWire);
+ needNewWire = false;
+ }
+ else if (theEdgesInLoops.count(anIter->TShape()) != 0)
+ { // There was found the edge already used in loop.
+ // Current wire should be released and new one should started
+ needNewWire = true;
+ continue;
+ }
+
+ TopoDS_Edge anEdge = *((TopoDS_Edge*)(&(*anIter)));
+ addEdgeToWire(anEdge, aBuilder, aCurVertex, theResWires.back());
+ anIter++;
+ }
+}
+
+
+gp_Dir getOuterEdgeDirection(const TopoDS_Shape& theEdge,
+ const TopoDS_Shape& theVertex)
+{
+ const Handle(BRep_TVertex)& aVertex = (const Handle(BRep_TVertex)&)theVertex.TShape();
+ gp_Pnt aVertexPnt = aVertex->Pnt();
+
+ const Handle(BRep_TEdge)& anEdge = (const Handle(BRep_TEdge)&)theEdge.TShape();
+
+ // Convert the edge to the curve to calculate the tangency.
+ // There should be only one curve in the edge.
+ Handle(BRep_Curve3D) aEdCurve =
+ Handle(BRep_Curve3D)::DownCast(anEdge->Curves().First());
+ double aFirst, aLast;
+ aEdCurve->Range(aFirst, aLast);
+ Handle(Geom_Curve) aCurve = aEdCurve->Curve3D();
+
+ gp_Pnt aPnt;
+ gp_Vec aTang;
+ aCurve->D1(aFirst, aPnt, aTang);
+ if (aVertexPnt.IsEqual(aPnt, tolerance))
+ return gp_Dir(aTang.Reversed());
+
+ aCurve->D1(aLast, aPnt, aTang);
+ return gp_Dir(aTang);
+}
+
+void removeWasteEdges(
+ std::list<TopoDS_Shape>::iterator& theStartVertex,
+ std::list<TopoDS_Shape>::iterator& theStartEdge,
+ const std::list<TopoDS_Shape>::iterator& theEndOfVertexes,
+ const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
+ BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE)
+{
+ bool isVertStep = true;
+ while (theStartVertex != theEndOfVertexes && theStartEdge != theEndOfEdges)
+ {
+ BOPCol_ListOfShape& aBunch = theMapVE.ChangeFromKey(*theStartVertex);
+ BOPCol_ListOfShape::Iterator anApprEdge(aBunch);
+ for ( ; anApprEdge.More(); anApprEdge.Next())
+ if (anApprEdge.Value() == *theStartEdge)
+ break;
+ if (anApprEdge.More())
+ aBunch.Remove(anApprEdge);
+
+ if (isVertStep)
+ theStartVertex++;
+ else
+ {
+ theStartEdge++;
+ // check current vertex to be a branching point
+ // if so, it will be a new starting point to find a loop
+ if (aBunch.Size() > 1)
+ break;
+ }
+ isVertStep = !isVertStep;
+ }
+
+ // The map of vertex-edges may be changed
+ BOPCol_IndexedDataMapOfShapeListOfShape aMapVECopy;
+ BOPCol_IndexedDataMapOfShapeListOfShape::Iterator aMapIter(theMapVE);
+ for (int ind = 1; aMapIter.More(); aMapIter.Next(), ind++)
+ if (!aMapIter.Value().IsEmpty())
+ aMapVECopy.Add(theMapVE.FindKey(ind), aMapIter.Value());
+ theMapVE.Clear();
+ theMapVE.Exchange(aMapVECopy);
+}
+
