1 // File: GeomAlgoAPI_SketchBuilder.cpp
2 // Created: 02 Jun 2014
3 // Author: Artem ZHIDKOV
5 #include <GeomAlgoAPI_SketchBuilder.h>
12 #include <BOPAlgo_Builder.hxx>
13 #include <BOPAlgo_Operation.hxx>
14 #include <BOPAlgo_PaveFiller.hxx>
15 #include <BOPTools.hxx>
16 #include <BRep_Builder.hxx>
17 #include <BRep_Curve3D.hxx>
18 #include <BRep_TEdge.hxx>
19 #include <BRep_TVertex.hxx>
20 #include <BRepAlgoAPI_Cut.hxx>
21 #include <BRepBuilderAPI_MakeFace.hxx>
22 #include <BRepClass_FaceClassifier.hxx>
23 #include <Geom_Curve.hxx>
24 #include <Geom_Plane.hxx>
26 #include <TopExp_Explorer.hxx>
27 #include <TopoDS_Edge.hxx>
28 #include <TopoDS_Face.hxx>
29 #include <TopoDS_Vertex.hxx>
30 #include <TopoDS_Wire.hxx>
32 #include <Precision.hxx>
35 #define DBL_MAX 1.7976931348623158e+308
39 const double tolerance = Precision::Confusion();
40 // This value helps to find direction on the boundaries of curve.
41 // It is not significant for lines, but is used for circles to avoid
42 // wrong directions of movement (when two edges are tangent on the certain vertex)
43 const double shift = acos(1.0 - 2.0 * tolerance);
45 /// \brief Search first vertex - the vertex with lowest x coordinate, which is used in 2 edges at least
46 static const TopoDS_Shape& findStartVertex(
47 const BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE,
48 const gp_Dir& theDirX, const gp_Dir& theDirY);
50 /// \brief Search the vertex on the sketch candidate to be the next one in the loop
51 static void findNextVertex(
52 const TopoDS_Shape& theStartVertex,
53 const BOPCol_IndexedDataMapOfShapeListOfShape& theVertexEdgeMap,
54 const gp_Dir& theStartDir,
55 const gp_Dir& theNormal,
56 TopoDS_Shape& theNextVertex,
57 TopoDS_Shape& theNextEdge,
60 /// \brief Create planar face using the edges surrounding it
61 static void createFace(const TopoDS_Shape& theStartVertex,
62 const std::list<TopoDS_Shape>::iterator& theStartEdge,
63 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
64 const gp_Pln& thePlane,
65 TopoDS_Face& theResFace);
67 /// \bief Create planar wire
68 static void createWireList(const TopoDS_Shape& theStartVertex,
69 const std::list<TopoDS_Shape>::iterator& theStartEdge,
70 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
71 const std::set<Handle(TopoDS_TShape)>& theEdgesInLoops,
72 std::list<TopoDS_Wire>& theResWires);
74 /// \brief Calculate outer tengency on the edge in specified vertex
75 static gp_Dir getOuterEdgeDirection(const TopoDS_Shape& theEdge,
76 const TopoDS_Shape& theVertex);
78 /// \brief Unnecessary edges will be removed from the map.
79 /// Positions of iterator will be updated
80 static void removeWasteEdges(
81 std::list<TopoDS_Shape>::iterator& theStartVertex,
82 std::list<TopoDS_Shape>::iterator& theStartEdge,
83 const std::list<TopoDS_Shape>::iterator& theEndOfVertexes,
84 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
85 BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE);
90 void GeomAlgoAPI_SketchBuilder::createFaces(
91 const boost::shared_ptr<GeomAPI_Pnt>& theOrigin,
92 const boost::shared_ptr<GeomAPI_Dir>& theDirX,
93 const boost::shared_ptr<GeomAPI_Dir>& theDirY,
94 const boost::shared_ptr<GeomAPI_Dir>& theNorm,
95 const std::list< boost::shared_ptr<GeomAPI_Shape> >& theFeatures,
96 std::list< boost::shared_ptr<GeomAPI_Shape> >& theResultFaces,
97 std::list< boost::shared_ptr<GeomAPI_Shape> >& theResultWires)
99 if (theFeatures.empty())
102 // Create the list of edges with shared vertexes
103 BOPAlgo_Builder aBuilder;
104 BOPAlgo_PaveFiller aPF;
105 TopoDS_Shape aFeaturesCompound;
107 if (theFeatures.size() == 1)
108 { // If there is only one feature, BOPAlgo_Builder will decline to work. Need to process it anyway
109 aFeaturesCompound = theFeatures.front()->impl<TopoDS_Shape>();
113 std::list< boost::shared_ptr<GeomAPI_Shape> >::const_iterator anIt = theFeatures.begin();
114 for (; anIt != theFeatures.end(); anIt++)
116 boost::shared_ptr<GeomAPI_Shape> aPreview(*anIt);
117 aBuilder.AddArgument(aPreview->impl<TopoDS_Edge>());
119 aPF.SetArguments(aBuilder.Arguments());
121 int aErr = aPF.ErrorStatus();
123 aBuilder.PerformWithFiller(aPF);
124 aErr = aBuilder.ErrorStatus();
126 aFeaturesCompound = aBuilder.Shape();
129 BOPCol_IndexedDataMapOfShapeListOfShape aMapVE; // map between vertexes and edges
130 BOPTools::MapShapesAndAncestors(aFeaturesCompound, TopAbs_VERTEX, TopAbs_EDGE, aMapVE);
131 if (aMapVE.IsEmpty()) // in case of not-initialized circle
134 gp_Dir aDirX = theDirX->impl<gp_Dir>();
135 gp_Dir aDirY = theDirY->impl<gp_Dir>();
136 gp_Dir aNorm = theNorm->impl<gp_Dir>();
138 gp_Pln aPlane(theOrigin->impl<gp_Pnt>(), aNorm);
140 // Set of edges used in loops
141 std::set<Handle(TopoDS_TShape)> anEdgesInLoops;
142 // Lists for processed vertexes and edges
143 std::list<TopoDS_Shape> aProcVertexes;
144 std::list<TopoDS_Shape> aProcEdges;
146 // Search the start vertex
147 TopoDS_Shape aStartVertex = findStartVertex(aMapVE, aDirX, aDirY);
148 aProcVertexes.push_back(aStartVertex);
150 TopoDS_Shape aCurVertex = aStartVertex;
151 gp_Dir aCurDir = aDirY.Reversed();
152 gp_Dir aCurNorm = aNorm.Reversed();
154 // Go through the edges and find loops
155 TopoDS_Shape aNextVertex;
156 TopoDS_Shape aBindingEdge;
158 while (aMapVE.Extent() > 0)
160 findNextVertex(aCurVertex, aMapVE, aCurDir, aCurNorm, aNextVertex, aBindingEdge, aNextDir);
163 // Try to find next vertex in the list of already processed
164 std::list<TopoDS_Shape>::iterator aVertIter = aProcVertexes.begin();
165 std::list<TopoDS_Shape>::iterator anEdgeIter = aProcEdges.begin();
166 for ( ; aVertIter != aProcVertexes.end(); aVertIter++)
168 if (aVertIter->TShape() == aNextVertex.TShape())
170 if (anEdgeIter != aProcEdges.end())
174 aProcVertexes.push_back(aNextVertex);
175 aProcEdges.push_back(aBindingEdge);
177 // The loop was found
178 if (aVertIter != aProcVertexes.end())
180 // If the binding edge is a full circle, then the list may be empty before addition. Need to update edge iterator
181 if (aProcEdges.size() == 1)
182 anEdgeIter = aProcEdges.begin();
184 if (aVertIter != aProcVertexes.begin())
186 // Check the orientation of the loop
187 gp_Dir aCN = getOuterEdgeDirection(*anEdgeIter, *aVertIter);
188 gp_Dir aCP = getOuterEdgeDirection(aProcEdges.back(), *aVertIter);
191 if (aCN.DotCross(aCP, aNorm) < -tolerance)
193 // The found loop has wrong orientation and may contain sub-loops.
194 // Need to check it onle again with another initial direction.
195 aCurVertex = *aVertIter;
197 aProcVertexes.pop_back();
198 aProcEdges.pop_back();
199 } while (aCurVertex != aProcVertexes.back());
200 aCurDir = getOuterEdgeDirection(aProcEdges.back(), aCurVertex);
201 aCurNorm = aNorm.Reversed();
206 // When the orientation is correct or the edges looped through
207 // the first element, create new face and remove unnecessary edges.
209 createFace(*aVertIter, anEdgeIter, aProcEdges.end(), aPlane, aPatch);
210 if (!aPatch.IsNull())
212 boost::shared_ptr<GeomAPI_Shape> aFace(new GeomAPI_Shape);
213 aFace->setImpl(new TopoDS_Shape(aPatch));
214 theResultFaces.push_back(aFace);
216 // push the edges used in the loop to the map
217 std::list<TopoDS_Shape>::iterator anIter;
218 for (anIter = anEdgeIter; anIter != aProcEdges.end(); anIter++)
219 anEdgesInLoops.insert(anIter->TShape());
220 // remove unnecessary edges
221 std::list<TopoDS_Shape>::iterator aCopyVLoop = aVertIter;
222 std::list<TopoDS_Shape>::iterator aCopyELoop = anEdgeIter;
223 removeWasteEdges(aVertIter, anEdgeIter, aProcVertexes.end(), aProcEdges.end(), aMapVE);
225 // revert the list of remaining edges
226 std::list<TopoDS_Shape> aRemainVertexes;
227 for ( ; aVertIter != aProcVertexes.end(); aVertIter++)
228 aRemainVertexes.push_front(*aVertIter);
229 std::list<TopoDS_Shape> aRemainEdges;
230 for ( ; anEdgeIter != aProcEdges.end(); anEdgeIter++)
231 aRemainEdges.push_front(*anEdgeIter);
232 // remove edges and vertexes used in the loop and add remaining ones
233 aProcVertexes.erase(aCopyVLoop, aProcVertexes.end());
234 aProcVertexes.insert(aProcVertexes.end(), aRemainVertexes.begin(), aRemainVertexes.end());
235 aProcEdges.erase(aCopyELoop, aProcEdges.end());
236 aProcEdges.insert(aProcEdges.end(), aRemainEdges.begin(), aRemainEdges.end());
238 // Recalculate current vertex and current direction
239 if (!aProcVertexes.empty())
241 aNextVertex = aProcVertexes.back();
242 if (!aProcEdges.empty())
243 aNextDir = getOuterEdgeDirection(aProcEdges.back(), aNextVertex);
244 else aNextDir = aDirY;
248 // if next vertex connected only to alone edge, this is a part of wire (not a closed loop),
249 // we need to go back through the list of already checked edges to find a branching vertex
250 if (!aMapVE.IsEmpty() && aMapVE.Contains(aNextVertex) &&
251 aMapVE.FindFromKey(aNextVertex).Size() == 1)
253 std::list<TopoDS_Shape>::reverse_iterator aVRIter = aProcVertexes.rbegin();
254 std::list<TopoDS_Shape>::reverse_iterator aERIter = aProcEdges.rbegin();
255 for (++aERIter, ++aVRIter; aERIter != aProcEdges.rend(); aERIter++, aVRIter++)
256 if (aMapVE.FindFromKey(*aVRIter).Size() > 2)
258 if (aERIter != aProcEdges.rend() || aMapVE.FindFromKey(*aVRIter).Size() == 1)
259 { // the branching vertex was found or current list of edges is a wire without branches
260 std::list<TopoDS_Shape>::iterator aEIter;
261 TopoDS_Shape aCurEdge;
262 if (aERIter != aProcEdges.rend())
264 aEIter = aERIter.base();
268 aEIter = aProcEdges.begin();
269 std::list<TopoDS_Wire> aTail;
270 createWireList(*aVRIter, aEIter, aProcEdges.end(), anEdgesInLoops, aTail);
271 std::list<TopoDS_Wire>::const_iterator aTailIter = aTail.begin();
272 for ( ; aTailIter != aTail.end(); aTailIter++)
273 if (!aTailIter->IsNull())
275 boost::shared_ptr<GeomAPI_Shape> aWire(new GeomAPI_Shape);
276 aWire->setImpl(new TopoDS_Shape(*aTailIter));
277 theResultWires.push_back(aWire);
279 std::list<TopoDS_Shape>::iterator aVIter = aVRIter.base();
280 std::list<TopoDS_Shape>::iterator aEItCopy = aEIter;
281 removeWasteEdges(--aVIter, aEItCopy, aProcVertexes.end(), aProcEdges.end(), aMapVE);
283 aProcEdges.erase(aEIter, aProcEdges.end());
284 aVIter = aVRIter.base();
285 aProcVertexes.erase(aVIter, aProcVertexes.end());
287 if (!aProcVertexes.empty())
289 aNextVertex = aProcVertexes.back();
290 if (!aCurEdge.IsNull())
291 aNextDir = getOuterEdgeDirection(aCurEdge, aNextVertex);
295 { // there is no branching vertex in the list of proceeded,
296 // so we should revert the list and go the opposite way
297 aProcVertexes.reverse();
298 aProcEdges.reverse();
299 aNextVertex = aProcVertexes.back();
300 aNextDir = getOuterEdgeDirection(aProcEdges.back(), aNextVertex);
304 // When all edges of current component of connectivity are processed,
305 // we should repeat procedure for finding initial vertex in the remaining
306 if (!aMapVE.IsEmpty() && !aMapVE.Contains(aNextVertex))
308 aProcVertexes.clear();
311 TopoDS_Shape aStartEdge;
312 aStartVertex = findStartVertex(aMapVE, aDirX, aDirY);
313 aProcVertexes.push_back(aStartVertex);
314 aNextVertex = aStartVertex;
315 aNextDir = aDirY.Reversed();
316 aCurNorm = aNorm.Reversed();
319 aCurVertex = aNextVertex;
323 if (theResultFaces.size() > 1)
324 fixIntersections(theResultFaces);
327 void GeomAlgoAPI_SketchBuilder::fixIntersections(
328 std::list< boost::shared_ptr<GeomAPI_Shape> >& theFaces)
330 BRepClass_FaceClassifier aClassifier;
332 std::list< boost::shared_ptr<GeomAPI_Shape> >::iterator anIter1 = theFaces.begin();
333 std::list< boost::shared_ptr<GeomAPI_Shape> >::iterator anIter2;
334 for ( ; anIter1 != theFaces.end(); anIter1++)
337 for (++anIter2; anIter2 != theFaces.end(); anIter2++)
339 const TopoDS_Face& aF1 = (*anIter1)->impl<TopoDS_Face>();
340 TopExp_Explorer aVert2((*anIter2)->impl<TopoDS_Shape>(), TopAbs_VERTEX);
341 for ( ; aVert2.More(); aVert2.Next())
343 Handle(BRep_TVertex) aV = Handle(BRep_TVertex)::DownCast(aVert2.Current().TShape());
344 aClassifier.Perform(aF1, aV->Pnt(), tolerance);
345 if (aClassifier.State() != TopAbs_IN)
349 { // second shape is not inside first, change the shapes order and repeat comparision
350 const TopoDS_Face& aF2 = (*anIter2)->impl<TopoDS_Face>();
351 TopExp_Explorer aVert1((*anIter1)->impl<TopoDS_Shape>(), TopAbs_VERTEX);
352 for ( ; aVert1.More(); aVert1.Next())
354 Handle(BRep_TVertex) aV = Handle(BRep_TVertex)::DownCast(aVert1.Current().TShape());
355 aClassifier.Perform(aF2, aV->Pnt(), tolerance);
356 if (aClassifier.State() != TopAbs_IN)
360 { // first shape should be cut from the second
361 BRepAlgoAPI_Cut aCut((*anIter2)->impl<TopoDS_Shape>(),
362 (*anIter1)->impl<TopoDS_Shape>());
363 (*anIter2)->setImpl(new TopoDS_Shape(aCut.Shape()));
367 { // second shape should be cut from the first
368 BRepAlgoAPI_Cut aCut((*anIter1)->impl<TopoDS_Shape>(),
369 (*anIter2)->impl<TopoDS_Shape>());
370 (*anIter1)->setImpl(new TopoDS_Shape(aCut.Shape()));
377 // =================== Auxiliary functions ====================================
378 const TopoDS_Shape& findStartVertex(
379 const BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE,
380 const gp_Dir& theDirX, const gp_Dir& theDirY)
382 int aStartVertexInd = 1;
383 double aMaxX = -DBL_MAX;
384 double aMaxY = -DBL_MAX;
385 int aNbVert = theMapVE.Extent();
386 for (int i = 1; i <= aNbVert; i++)
388 const TopoDS_Vertex& aV = (const TopoDS_Vertex&)theMapVE.FindKey(i);
389 const Handle(BRep_TVertex)& aVert = (const Handle(BRep_TVertex)&)aV.TShape();
390 const gp_Pnt& aVertPnt = aVert->Pnt();
392 double aX = aVertPnt.XYZ().Dot(theDirX.XYZ());
393 double aY = aVertPnt.XYZ().Dot(theDirY.XYZ());
394 if ((aX > aMaxX || (fabs(aX - aMaxX) < tolerance && aY > aMaxY)) &&
395 theMapVE.FindFromIndex(i).Extent() > 1)
402 return theMapVE.FindKey(aStartVertexInd);
406 const TopoDS_Shape& theStartVertex,
407 const BOPCol_IndexedDataMapOfShapeListOfShape& theVertexEdgeMap,
408 const gp_Dir& theStartDir,
409 const gp_Dir& theNormal,
410 TopoDS_Shape& theNextVertex,
411 TopoDS_Shape& theNextEdge,
414 const BOPCol_ListOfShape& anEdgesList = theVertexEdgeMap.FindFromKey(theStartVertex);
415 BOPCol_ListOfShape::Iterator aEdIter(anEdgesList);
416 double aBestEdgeProj = DBL_MAX;
417 for ( ; aEdIter.More(); aEdIter.Next())
419 gp_Dir aTang = getOuterEdgeDirection(aEdIter.Value(), theStartVertex);
422 // The projection is normalized in segment (-1, 1),
423 // where (-1, 0] corresponds to the angles (pi/2, 0] between theStartDir and aTang
424 // and [0, 1) corresponds to the angles [0, -pi/2)
425 double aProj = (aTang.Dot(theStartDir) - 1.0) * 0.5;
426 if (fabs(fabs(aProj) - 1) < tolerance)
428 if (theStartDir.DotCross(aTang, theNormal) < tolerance)
431 if (aProj < aBestEdgeProj)
433 aBestEdgeProj = aProj;
434 theNextEdge = aEdIter.Value();
435 TopExp_Explorer aVertExp(theNextEdge, TopAbs_VERTEX);
436 for ( ; aVertExp.More(); aVertExp.Next())
437 if (aVertExp.Current().TShape() != theStartVertex.TShape())
439 theNextVertex = aVertExp.Current();
440 theNextDir = getOuterEdgeDirection(aEdIter.Value(), theNextVertex);
443 if (!aVertExp.More())
444 { // This edge is a full circle
445 TopoDS_Vertex aV1, aV2;
446 TopExp::Vertices(*(const TopoDS_Edge*)(&theNextEdge), aV1, aV2);
447 if (aV1.Orientation() == theStartVertex.Orientation())
451 theNextDir = getOuterEdgeDirection(aEdIter.Value(), theNextVertex);
457 static void addEdgeToWire(const TopoDS_Edge& theEdge,
458 const BRep_Builder& theBuilder,
459 TopoDS_Shape& theSpliceVertex,
460 TopoDS_Wire& theWire)
462 TopoDS_Edge anEdge = theEdge;
463 bool isCurVertChanged = false;
464 TopoDS_Shape aCurVertChanged;
466 TopExp_Explorer aVertExp(theEdge, TopAbs_VERTEX);
467 for ( ; aVertExp.More(); aVertExp.Next())
469 const TopoDS_Shape& aVertex = aVertExp.Current();
470 if (aVertex.TShape() == theSpliceVertex.TShape() &&
471 aVertex.Orientation() != theEdge.Orientation())
472 { // Current vertex is the last for the edge, so its orientation is wrong, need to revert the edge
476 if (aVertex.TShape() != theSpliceVertex.TShape())
478 aCurVertChanged = aVertex;
479 isCurVertChanged = true;
482 theSpliceVertex = isCurVertChanged ? aCurVertChanged : aVertExp.Current();
484 theBuilder.Add(theWire, anEdge);
487 void createFace(const TopoDS_Shape& theStartVertex,
488 const std::list<TopoDS_Shape>::iterator& theStartEdge,
489 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
490 const gp_Pln& thePlane,
491 TopoDS_Face& theResFace)
493 TopoDS_Wire aResWire;
494 BRep_Builder aBuilder;
495 aBuilder.MakeWire(aResWire);
497 TopoDS_Shape aCurVertex = theStartVertex;
498 std::list<TopoDS_Shape>::const_iterator anEdgeIter = theStartEdge;
499 for ( ; anEdgeIter != theEndOfEdges; anEdgeIter++)
501 TopoDS_Edge anEdge = *((TopoDS_Edge*)(&(*anEdgeIter)));
502 addEdgeToWire(anEdge, aBuilder, aCurVertex, aResWire);
505 BRepBuilderAPI_MakeFace aFaceBuilder(thePlane, aResWire);
506 if (aFaceBuilder.Error() == BRepBuilderAPI_FaceDone)
507 theResFace = aFaceBuilder.Face();
510 void createWireList(const TopoDS_Shape& theStartVertex,
511 const std::list<TopoDS_Shape>::iterator& theStartEdge,
512 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
513 const std::set<Handle(TopoDS_TShape)>& theEdgesInLoops,
514 std::list<TopoDS_Wire>& theResWires)
516 BRep_Builder aBuilder;
517 bool needNewWire = true;
518 TopoDS_Shape aCurVertex = theStartVertex;
520 std::list<TopoDS_Shape>::iterator anIter = theStartEdge;
521 while (anIter != theEndOfEdges)
523 while (anIter != theEndOfEdges && needNewWire &&
524 theEdgesInLoops.count(anIter->TShape()) != 0)
526 TopExp_Explorer aVertExp(*anIter, TopAbs_VERTEX);
527 for ( ; aVertExp.More(); aVertExp.Next())
528 if (aVertExp.Current().TShape() != aCurVertex.TShape())
530 aCurVertex = aVertExp.Current();
535 if (anIter == theEndOfEdges)
539 { // The new wire should be created
541 aBuilder.MakeWire(aWire);
542 theResWires.push_back(aWire);
545 else if (theEdgesInLoops.count(anIter->TShape()) != 0)
546 { // There was found the edge already used in loop.
547 // Current wire should be released and new one should started
552 TopoDS_Edge anEdge = *((TopoDS_Edge*)(&(*anIter)));
553 addEdgeToWire(anEdge, aBuilder, aCurVertex, theResWires.back());
559 gp_Dir getOuterEdgeDirection(const TopoDS_Shape& theEdge,
560 const TopoDS_Shape& theVertex)
562 const Handle(BRep_TVertex)& aVertex = (const Handle(BRep_TVertex)&)theVertex.TShape();
563 gp_Pnt aVertexPnt = aVertex->Pnt();
565 const Handle(BRep_TEdge)& anEdge = (const Handle(BRep_TEdge)&)theEdge.TShape();
567 // Convert the edge to the curve to calculate the tangency.
568 // There should be only one curve in the edge.
569 Handle(BRep_Curve3D) aEdCurve =
570 Handle(BRep_Curve3D)::DownCast(anEdge->Curves().First());
571 double aFirst, aLast;
572 aEdCurve->Range(aFirst, aLast);
573 Handle(Geom_Curve) aCurve = aEdCurve->Curve3D();
577 aCurve->D1(aFirst + shift, aPnt, aTang);
578 aCurve->D0(aFirst, aPnt);
579 if (aVertexPnt.IsEqual(aPnt, tolerance))
580 return gp_Dir(aTang.Reversed());
582 aCurve->D1(aLast - shift, aPnt, aTang);
583 return gp_Dir(aTang);
586 void removeWasteEdges(
587 std::list<TopoDS_Shape>::iterator& theStartVertex,
588 std::list<TopoDS_Shape>::iterator& theStartEdge,
589 const std::list<TopoDS_Shape>::iterator& theEndOfVertexes,
590 const std::list<TopoDS_Shape>::iterator& theEndOfEdges,
591 BOPCol_IndexedDataMapOfShapeListOfShape& theMapVE)
593 bool isVertStep = true;
594 while (theStartVertex != theEndOfVertexes && theStartEdge != theEndOfEdges)
596 BOPCol_ListOfShape& aBunch = theMapVE.ChangeFromKey(*theStartVertex);
597 BOPCol_ListOfShape::Iterator anApprEdge(aBunch);
598 for ( ; anApprEdge.More(); anApprEdge.Next())
599 if (anApprEdge.Value() == *theStartEdge)
601 if (anApprEdge.More())
602 aBunch.Remove(anApprEdge);
609 // check current vertex to be a branching point
610 // if so, it will be a new starting point to find a loop
611 if (aBunch.Size() > 1)
614 isVertStep = !isVertStep;
617 // The map of vertex-edges may be changed
618 BOPCol_IndexedDataMapOfShapeListOfShape aMapVECopy;
619 BOPCol_IndexedDataMapOfShapeListOfShape::Iterator aMapIter(theMapVE);
620 for (int ind = 1; aMapIter.More(); aMapIter.Next(), ind++)
621 if (!aMapIter.Value().IsEmpty())
622 aMapVECopy.Add(theMapVE.FindKey(ind), aMapIter.Value());
624 theMapVE.Exchange(aMapVECopy);