1 // Copyright (C) 2007-2010 CEA/DEN, EDF R&D, OPEN CASCADE
3 // This library is free software; you can redistribute it and/or
4 // modify it under the terms of the GNU Lesser General Public
5 // License as published by the Free Software Foundation; either
6 // version 2.1 of the License.
8 // This library is distributed in the hope that it will be useful,
9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 // Lesser General Public License for more details.
13 // You should have received a copy of the GNU Lesser General Public
14 // License along with this library; if not, write to the Free Software
15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
20 // File : GEOMImpl_Fillet1d.cxx
23 #include "GEOMImpl_Fillet1d.hxx"
25 #include <BRep_Tool.hxx>
26 #include <BRepAdaptor_Curve.hxx>
27 #include <BRepBuilderAPI_MakeEdge.hxx>
30 #include <gp_Circ.hxx>
31 #include <Geom2d_Line.hxx>
32 #include <Geom2dAPI_ProjectPointOnCurve.hxx>
33 #include <Geom2dAPI_InterCurveCurve.hxx>
34 #include <GeomAPI_ProjectPointOnCurve.hxx>
35 #include <GeomProjLib.hxx>
36 #include <Geom_Circle.hxx>
37 #include <Precision.hxx>
38 #include <TColStd_ListIteratorOfListOfReal.hxx>
41 * class GEOMImpl_Fillet1d
45 //=======================================================================
46 //function : Constructor
48 //=======================================================================
49 GEOMImpl_Fillet1d::GEOMImpl_Fillet1d(const TopoDS_Edge& theEdge1,
50 const TopoDS_Edge& theEdge2,
51 const gp_Pln& thePlane)
52 : myEdgesExchnged( Standard_False )
54 myPlane = new Geom_Plane(thePlane);
56 BRepAdaptor_Curve aBAC1(theEdge1);
57 BRepAdaptor_Curve aBAC2(theEdge2);
58 if (aBAC1.GetType() < aBAC2.GetType())
59 { // first curve must be more complicated
62 myEdgesExchnged = Standard_True;
70 Handle(Geom_Curve) aCurve1 = BRep_Tool::Curve(myEdge1, myStart1, myEnd1);
71 Handle(Geom_Curve) aCurve2 = BRep_Tool::Curve(myEdge2, myStart2, myEnd2);
73 myCurve1 = GeomProjLib::Curve2d(aCurve1, myStart1, myEnd1, myPlane);
74 myCurve2 = GeomProjLib::Curve2d(aCurve2, myStart2, myEnd2, myPlane);
76 while (myCurve1->IsPeriodic() && myStart1 >= myEnd1)
77 myEnd1 += myCurve1->Period();
78 while (myCurve2->IsPeriodic() && myStart2 >= myEnd2)
79 myEnd2 += myCurve2->Period();
81 if (aBAC1.GetType() == aBAC2.GetType())
83 if (myEnd2 - myStart2 < myEnd1 - myStart1)
84 { // first curve must be parametrically shorter
85 TopoDS_Edge anEdge = myEdge1;
88 Handle(Geom2d_Curve) aCurve = myCurve1;
91 Standard_Real a = myStart1;
97 myEdgesExchnged = Standard_True;
102 //=======================================================================
103 //function : isRadiusIntersected
104 //purpose : local function
105 //=======================================================================
106 static Standard_Boolean isRadiusIntersected(const Handle(Geom2d_Curve)& theCurve,
107 const gp_Pnt2d theStart,
108 const gp_Pnt2d theEnd,
109 const Standard_Boolean theStartConnected)
111 const Standard_Real aTol = Precision::Confusion();
112 const Standard_Real anAngTol = Precision::Angular();
113 Geom2dAPI_InterCurveCurve anInter(theCurve, new Geom2d_Line(theStart,
114 gp_Dir2d(gp_Vec2d(theStart, theEnd))), aTol);
117 for(a = anInter.NbPoints(); a > 0; a--)
119 aPoint = anInter.Point(a);
120 if ( aPoint.Distance(theStart) < aTol && !theStartConnected )
121 return Standard_True;
122 if (aPoint.Distance(theEnd) < aTol * 200)
123 return Standard_True;
124 if (gp_Vec2d(aPoint, theStart).IsOpposite(gp_Vec2d(aPoint, theEnd), anAngTol))
125 return Standard_True;
127 Handle(Geom2d_Curve) aCurve;
128 for(a = anInter.NbSegments(); a > 0; a--)
130 anInter.Segment(a, aCurve);
131 aPoint = aCurve->Value(aCurve->FirstParameter());
132 if (aPoint.Distance(theStart) < aTol)
133 if (!theStartConnected)
134 return Standard_True;
135 if (aPoint.Distance(theEnd) < aTol)
136 return Standard_True;
137 if (gp_Vec2d(aPoint, theStart).IsOpposite(gp_Vec2d(aPoint, theEnd), anAngTol))
138 return Standard_True;
139 aPoint = aCurve->Value(aCurve->LastParameter());
140 if (aPoint.Distance(theStart) < aTol)
141 if (!theStartConnected)
142 return Standard_True;
143 if (aPoint.Distance(theEnd) < aTol)
144 return Standard_True;
145 if (gp_Vec2d(aPoint, theStart).IsOpposite(gp_Vec2d(aPoint, theEnd), anAngTol))
146 return Standard_True;
148 return Standard_False;
152 //=======================================================================
153 //function : fillPoint
155 //=======================================================================
156 void GEOMImpl_Fillet1d::fillPoint(GEOMImpl_Fillet1dPoint* thePoint)
160 const Standard_Real aTol = Precision::Confusion();
161 myCurve1->D1(thePoint->GetParam(), aPoint, aVec);
162 if (aVec.SquareMagnitude() < aTol)
165 gp_Vec2d aPerp(((myStartSide)?-1:1) * aVec.Y(), ((myStartSide)?1:-1) * aVec.X());
167 aPerp.Multiply(myRadius);
168 gp_Pnt2d aCenter = aPoint.Translated(aPerp);
169 thePoint->SetCenter(aCenter);
171 // on the intersection point
172 Standard_Boolean aValid = Standard_True;
173 Geom2dAPI_ProjectPointOnCurve aProjInt(aPoint, myCurve2);
174 if (aProjInt.NbPoints() && aPoint.Distance(aProjInt.NearestPoint()) < aTol)
175 aValid = Standard_False;
177 aValid = !isRadiusIntersected(myCurve2, aPoint, aCenter, Standard_True);
179 Geom2dAPI_ProjectPointOnCurve aProj(aCenter, myCurve2);
180 Standard_Integer a, aNB = aProj.NbPoints();
181 for(a = aNB; a > 0; a--)
183 if (aPoint.Distance(aProj.Point(a)) < aTol)
186 Standard_Boolean aValid2 = aValid;
188 aValid2 = !isRadiusIntersected(myCurve1, aCenter, aProj.Point(a), Standard_False);
190 // checking the right parameter
191 Standard_Real aParam = aProj.Parameter(a);
192 while(myCurve2->IsPeriodic() && aParam < myStart2)
193 aParam += myCurve2->Period();
195 thePoint->AddValue(aProj.Distance(a) * aProj.Distance(a) - myRadius * myRadius,
196 (aParam >= myStart2 && aParam <= myEnd2 && aValid2));
197 if (fabs(fabs(aProj.Distance(a)) - myRadius) < aTol)
198 thePoint->SetParam2(aParam);
202 //=======================================================================
203 //function : fillDiff
205 //=======================================================================
206 void GEOMImpl_Fillet1d::fillDiff(GEOMImpl_Fillet1dPoint* thePoint, Standard_Real theDiffStep, Standard_Boolean theFront)
208 GEOMImpl_Fillet1dPoint* aDiff =
209 new GEOMImpl_Fillet1dPoint(thePoint->GetParam() + (theFront?(theDiffStep):(-theDiffStep)));
211 if (!thePoint->ComputeDifference(aDiff))
213 aDiff->SetParam(thePoint->GetParam() + (theFront?(-theDiffStep):(theDiffStep)));
215 thePoint->ComputeDifference(aDiff);
220 //=======================================================================
223 //=======================================================================
224 Standard_Boolean GEOMImpl_Fillet1d::Perform(const Standard_Real theRadius)
226 myResultParams.Clear();
227 myResultOrientation.Clear();
229 Standard_Real aNBSteps = 100;
230 Geom2dAdaptor_Curve aGAC(myCurve1);
231 switch (aGAC.GetType())
239 case GeomAbs_Ellipse:
242 case GeomAbs_BezierCurve:
243 case GeomAbs_BSplineCurve:
244 aNBSteps = 2 + aGAC.Degree() * aGAC.NbPoles();
246 default: // unknown: maximum
250 myRadius = theRadius;
251 Standard_Real aParam, aStep, aDStep;
252 aStep = (myEnd1 - myStart1) / aNBSteps;
253 aDStep = aStep/1000.;
255 Standard_Integer aCycle;
256 for(aCycle = 2, myStartSide = Standard_False; aCycle; myStartSide = !myStartSide, aCycle--)
258 GEOMImpl_Fillet1dPoint *aLeft = NULL, *aRight = NULL;
260 for(aParam = myStart1 + aStep; aParam < myEnd1 || fabs(myEnd1 - aParam) < Precision::Confusion(); aParam += aStep)
264 aLeft = new GEOMImpl_Fillet1dPoint(aParam - aStep);
266 fillDiff(aLeft, aDStep, Standard_True);
269 aRight = new GEOMImpl_Fillet1dPoint(aParam);
271 fillDiff(aRight, aDStep, Standard_False);
273 aLeft->FilterPoints(aRight);
274 performNewton(aLeft, aRight);
282 if (myResultParams.Extent())
283 return Standard_True;
285 return Standard_False;
288 //=======================================================================
289 //function : processPoint
291 //=======================================================================
292 Standard_Boolean GEOMImpl_Fillet1d::processPoint(GEOMImpl_Fillet1dPoint* theLeft,
293 GEOMImpl_Fillet1dPoint* theRight,
294 Standard_Real theParameter)
296 if (theParameter >= theLeft->GetParam() && theParameter < theRight->GetParam())
298 Standard_Real aDX = theRight->GetParam() - theLeft->GetParam();
299 if (theParameter - theLeft->GetParam() < aDX / 100.)
301 theParameter = theLeft->GetParam() + aDX / 100.;
303 if (theRight->GetParam() - theParameter < aDX / 100.)
305 theParameter = theRight->GetParam() - aDX / 100.;
308 GEOMImpl_Fillet1dPoint* aPoint1 = theLeft->Copy();
309 GEOMImpl_Fillet1dPoint* aPoint2 = new GEOMImpl_Fillet1dPoint(theParameter);
311 fillDiff(aPoint2, aDX / 1000., Standard_True);
313 aPoint1->FilterPoints(aPoint2);
314 performNewton(aPoint1, aPoint2);
315 aPoint2->FilterPoints(theRight);
316 performNewton(aPoint2, theRight);
320 return Standard_True;
323 return Standard_False;
326 //=======================================================================
327 //function : performNewton
329 //=======================================================================
330 void GEOMImpl_Fillet1d::performNewton(GEOMImpl_Fillet1dPoint* theLeft,
331 GEOMImpl_Fillet1dPoint* theRight)
334 // check the left: if this is solution store it and remove it from the list of researching points of theLeft
335 a = theLeft->HasSolution(myRadius);
338 if (theLeft->IsValid(a))
340 myResultParams.Append(theLeft->GetParam());
341 myResultOrientation.Append(myStartSide);
346 Standard_Real aDX = theRight->GetParam() - theLeft->GetParam();
347 if ( aDX < Precision::Confusion() / 1000000.)
349 a = theRight->HasSolution(myRadius);
351 if (theRight->IsValid(a))
353 myResultParams.Append(theRight->GetParam());
354 myResultOrientation.Append(myStartSide);
359 for(a = 1; a <= theLeft->GetNBValues(); a++)
361 Standard_Integer aNear = theLeft->GetNear(a);
363 Standard_Real aA = (theRight->GetDiff(aNear) - theLeft->GetDiff(a)) / aDX;
364 Standard_Real aB = theLeft->GetDiff(a) - aA * theLeft->GetParam();
365 Standard_Real aC = theLeft->GetValue(a) - theLeft->GetDiff(a) * theLeft->GetParam() +
366 aA * theLeft->GetParam() * theLeft->GetParam() / 2.0;
367 Standard_Real aDet = aB * aB - 2.0 * aA * aC;
369 if ( fabs(aDet) < gp::Resolution() )
372 if (fabs(aA) < Precision::Confusion())
374 if (fabs(aB) > 10e-20)
376 Standard_Real aX0 = - aC / aB; // use extremum
377 if (aX0 > theLeft->GetParam() && aX0 < theRight->GetParam())
378 processPoint(theLeft, theRight, aX0);
382 processPoint(theLeft, theRight, theLeft->GetParam() + aDX / 2.0); // linear division otherwise
387 if (fabs(aB) > fabs(aDet * 1000000.))
388 { // possible floating point operations accurancy errors
389 processPoint(theLeft, theRight, theLeft->GetParam() + aDX / 2.0); // linear division otherwise
396 Standard_Boolean aRes = processPoint(theLeft, theRight, (- aB + aDet) / aA);
398 aRes = processPoint(theLeft, theRight, (- aB - aDet) / aA);
400 processPoint(theLeft, theRight, theLeft->GetParam() + aDX / 2.0); // linear division otherwise
404 Standard_Real aX0 = - aB / aA; // use extremum
405 if (aX0 > theLeft->GetParam() && aX0 < theRight->GetParam())
406 processPoint(theLeft, theRight, aX0);
408 processPoint(theLeft, theRight, theLeft->GetParam() + aDX / 2.0); // linear division otherwise
415 //=======================================================================
418 //=======================================================================
419 TopoDS_Edge GEOMImpl_Fillet1d::Result(const gp_Pnt& thePoint,
420 TopoDS_Edge& theEdge1,
421 TopoDS_Edge& theEdge2)
424 gp_Pnt2d aTargetPoint2d;
425 Standard_Real aX, aY;
426 ElSLib::PlaneParameters(myPlane->Pln().Position(), thePoint, aX, aY);
427 aTargetPoint2d.SetCoord(aX, aY);
429 // choose the nearest circle
430 Standard_Real aDistance, aP;
431 GEOMImpl_Fillet1dPoint *aNearest;
433 TColStd_ListIteratorOfListOfReal anIter(myResultParams);
434 for(aNearest = NULL, a = 1; anIter.More(); anIter.Next(), a++)
436 myStartSide = (myResultOrientation.Value(a)) ? Standard_True : Standard_False;
437 GEOMImpl_Fillet1dPoint *aPoint = new GEOMImpl_Fillet1dPoint(anIter.Value());
439 if (!aPoint->HasSolution(myRadius))
441 aP = fabs(aPoint->GetCenter().Distance(aTargetPoint2d) - myRadius);
442 if (!aNearest || aP < aDistance)
456 // create circle edge
457 gp_Pnt aCenter = ElSLib::PlaneValue(aNearest->GetCenter().X(),
458 aNearest->GetCenter().Y(),
459 myPlane->Pln().Position());
460 Handle(Geom_Circle) aCircle =
461 new Geom_Circle(gp_Ax2(aCenter, myPlane->Pln().Axis().Direction()), myRadius);
462 gp_Pnt2d aPoint2d1, aPoint2d2;
463 myCurve1->D0(aNearest->GetParam(), aPoint2d1);
464 myCurve2->D0(aNearest->GetParam2(), aPoint2d2);
465 gp_Pnt aPoint1 = ElSLib::PlaneValue(aPoint2d1.X(), aPoint2d1.Y(), myPlane->Pln().Position());
466 gp_Pnt aPoint2 = ElSLib::PlaneValue(aPoint2d2.X(), aPoint2d2.Y(), myPlane->Pln().Position());
468 GeomAPI_ProjectPointOnCurve aProj(thePoint, aCircle);
469 Standard_Real aTarGetParam = aProj.LowerDistanceParameter();
470 gp_Pnt aPointOnCircle = aProj.NearestPoint();
472 // Check extrema point manually, because there is a bug in Open CASCADE
473 // in calculation of nearest point to a circle near the parameter 0.0
474 gp_Pnt p0 = ElCLib::Value(0.0, aCircle->Circ());
475 if (p0.Distance(thePoint) < aPointOnCircle.Distance(thePoint))
481 aProj.Perform(aPoint1);
482 Standard_Real aParam1 = aProj.LowerDistanceParameter();
483 aProj.Perform(aPoint2);
484 Standard_Real aParam2 = aProj.LowerDistanceParameter();
485 Standard_Boolean aIsOut = ((aParam1 < aTarGetParam && aParam2 < aTarGetParam) ||
486 (aParam1 > aTarGetParam && aParam2 > aTarGetParam));
487 if (aParam1 > aParam2)
489 BRepBuilderAPI_MakeEdge aBuilder(aCircle->Circ(),
490 aIsOut ? aParam2 : aParam1,
491 aIsOut? aParam1 : aParam2);
492 aResult = aBuilder.Edge();
495 Standard_Real aStart, anEnd;
496 Handle(Geom_Curve) aCurve = BRep_Tool::Curve(myEdge1, aStart, anEnd);
498 aCurve->D1(aNearest->GetParam(), aPoint1, aDir);
501 aCircle->D1(aParam1, aPoint1, aCircleDir);
502 if ((aCircleDir.Angle(aDir) > PI / 2.0) ^ aIsOut)
503 aStart = aNearest->GetParam();
505 anEnd = aNearest->GetParam();
507 //Check the case when start and end are identical. This happens
508 //when the edge decreases to size 0. Old ww5 allows such
509 //cases. So we are again bug compatible
510 if (fabs(aStart - anEnd) < Precision::PConfusion()/*gp::Resolution()*/)
513 BRepBuilderAPI_MakeEdge aDivider1(aCurve, aStart, anEnd);
515 theEdge2 = aDivider1.Edge();
517 theEdge1 = aDivider1.Edge();
520 aCurve = BRep_Tool::Curve(myEdge2, aStart, anEnd);
521 aCurve->D1(aNearest->GetParam2(), aPoint2, aDir);
523 aCircle->D1(aParam2, aPoint2, aCircleDir);
524 if ((aCircleDir.Angle(aDir) > PI / 2.0) ^ (!aIsOut))
525 aStart = aNearest->GetParam2();
527 anEnd = aNearest->GetParam2();
529 //Check the case when start and end are identical. This happens
530 //when the edge decreases to size 0. Old ww5 allows such
531 //cases. So we are again bug compatible
532 if (fabs(aStart - anEnd) < Precision::PConfusion()/*gp::Resolution()*/)
534 BRepBuilderAPI_MakeEdge aDivider2(aCurve, aStart, anEnd);
536 theEdge1 = aDivider2.Edge();
538 theEdge2 = aDivider2.Edge();
544 //=======================================================================
545 //function : AddValue
547 //=======================================================================
548 void GEOMImpl_Fillet1dPoint::AddValue(Standard_Real theValue, Standard_Boolean theValid)
551 for(a = 1; a <= myV.Length(); a++)
553 if (theValue < myV.Value(a))
555 myV.InsertBefore(a, theValue);
556 myValid.InsertBefore(a, (Standard_Integer)theValid);
560 myV.Append(theValue);
561 myValid.Append((Standard_Integer)theValid);
564 //=======================================================================
565 //function : ComputeDifference
567 //=======================================================================
568 Standard_Boolean GEOMImpl_Fillet1dPoint::ComputeDifference(GEOMImpl_Fillet1dPoint* thePoint)
571 Standard_Boolean aDiffsSet = (myD.Length() != 0);
572 Standard_Real aDX = thePoint->GetParam() - myParam, aDY;
573 if (thePoint->myV.Length() == myV.Length())
574 { // absolutely the same points
575 for(a = 1; a <= myV.Length(); a++)
577 aDY = thePoint->myV.Value(a) - myV.Value(a);
579 myD.SetValue(a, fabs(aDX) > gp::Resolution() ? (aDY/aDX) : 0);
581 myD.Append( fabs(aDX) > gp::Resolution() ? (aDY/aDX) : 0);
583 return Standard_True;
585 // between the diffeerent points searching for nearest analogs
587 for(a = 1; a <= myV.Length(); a++)
589 for(b = 1; b <= thePoint->myV.Length(); b++)
591 if (b == 1 || fabs(thePoint->myV.Value(b) - myV.Value(a)) < fabs(aDY))
592 aDY = thePoint->myV.Value(b) - myV.Value(a);
596 if ( fabs(aDX) > gp::Resolution() && fabs(aDY / aDX) < fabs(myD.Value(a)))
597 myD.SetValue(a, aDY / aDX);
603 myD.Append( fabs(aDX) > gp::Resolution() ? aDY/aDX : 0);
607 return Standard_False;
610 //=======================================================================
611 //function : FilterPoints
613 //=======================================================================
614 void GEOMImpl_Fillet1dPoint::FilterPoints(GEOMImpl_Fillet1dPoint* thePoint)
616 Standard_Integer a, b;
617 TColStd_SequenceOfReal aDiffs;
618 Standard_Real aY, aY2, aDX = thePoint->GetParam() - myParam;
619 for(a = 1; a <= myV.Length(); a++)
621 // searching for near point from thePoint
622 Standard_Integer aNear = 0;
623 Standard_Real aDiff = aDX * 10000.;
624 aY = myV.Value(a) + myD.Value(a) * aDX;
625 for(b = 1; b <= thePoint->myV.Length(); b++)
627 // calculate hypothesis value of the Y2 with the constant first and second derivative
628 aY2 = aY + aDX * (thePoint->myD.Value(b) - myD.Value(a)) / 2.0;
629 if (aNear == 0 || fabs(aY2 - thePoint->myV.Value(b)) < fabs(aDiff))
632 aDiff = aY2 - thePoint->myV.Value(b);
638 if (myV.Value(a) * thePoint->myV.Value(aNear) > 0)
639 {// the same sign at the same sides of the interval
640 if (myV.Value(a) * myD.Value(a) > 0)
642 if (fabs(myD.Value(a)) > Precision::Confusion())
647 if (fabs(myV.Value(a)) > fabs(thePoint->myV.Value(aNear)))
648 if (thePoint->myV.Value(aNear) * thePoint->myD.Value(aNear) < 0 &&
649 fabs(thePoint->myD.Value(aNear)) > Precision::Confusion())
659 if (myV.Value(a) * thePoint->myV.Value(aNear) > 0)
661 if ((myV.Value(a) + myD.Value(a) * aDX) * myV.Value(a) > Precision::Confusion() &&
662 (thePoint->myV.Value(aNear) + thePoint->myD.Value(aNear) * aDX) * thePoint->myV.Value(aNear) > Precision::Confusion())
671 if ( fabs(aDX) < gp::Resolution() || fabs(aDiff / aDX) > 1.e+7)
678 { // there is no near: remove it from the list
686 Standard_Boolean aFound = Standard_False;
687 for(b = 1; b <= myNear.Length(); b++)
689 if (myNear.Value(b) == aNear)
691 if (fabs(aDiffs.Value(b)) < fabs(aDiff))
692 { // return this 'near'
693 aFound = Standard_True;
701 { // remove the old 'near'
714 myNear.Append(aNear);
715 aDiffs.Append(aDiff);
721 //=======================================================================
724 //=======================================================================
725 GEOMImpl_Fillet1dPoint* GEOMImpl_Fillet1dPoint::Copy()
727 GEOMImpl_Fillet1dPoint* aCopy = new GEOMImpl_Fillet1dPoint(myParam);
729 for(a = 1; a <= myV.Length(); a++)
731 aCopy->myV.Append(myV.Value(a));
732 aCopy->myD.Append(myD.Value(a));
733 aCopy->myValid.Append(myValid.Value(a));
738 //=======================================================================
739 //function : HasSolution
741 //=======================================================================
742 Standard_Integer GEOMImpl_Fillet1dPoint::HasSolution(const Standard_Real theRadius)
745 for(a = 1; a <= myV.Length(); a++)
747 if (fabs(sqrt(fabs(fabs(myV.Value(a)) + theRadius * theRadius)) - theRadius) < Precision::Confusion() / 10.)
753 //=======================================================================
754 //function : RemoveSolution
756 //=======================================================================
757 void GEOMImpl_Fillet1dPoint::RemoveSolution(Standard_Integer theIndex)
759 myV.Remove(theIndex);
760 myD.Remove(theIndex);
761 myValid.Remove(theIndex);
762 myNear.Remove(theIndex);