src/SketchPlugin/SketchPlugin_Fillet.cpp

   1 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D -->
   2
   3 // File:    SketchPlugin_Fillet.cpp
   4 // Created: 19 Mar 2015
   5 // Author:  Artem ZHIDKOV
   6
   7 #include "SketchPlugin_Fillet.h"
   8
   9 #include "SketchPlugin_Arc.h"
  10 #include "SketchPlugin_Line.h"
  11 #include "SketchPlugin_Point.h"
  12 #include "SketchPlugin_Sketch.h"
  13 #include "SketchPlugin_ConstraintEqual.h"
  14 #include "SketchPlugin_ConstraintCoincidence.h"
  15 #include "SketchPlugin_ConstraintLength.h"
  16 #include "SketchPlugin_ConstraintTangent.h"
  17 #include "SketchPlugin_ConstraintRadius.h"
  18 #include "SketchPlugin_Tools.h"
  19
  20 #include <ModelAPI_AttributeRefAttr.h>
  21 #include <ModelAPI_Data.h>
  22 #include <ModelAPI_Events.h>
  23 #include <ModelAPI_Session.h>
  24 #include <ModelAPI_Tools.h>
  25 #include <ModelAPI_Validator.h>
  26
  27 #include <GeomAlgoAPI_EdgeBuilder.h>
  28
  29 #include <GeomAPI_Circ2d.h>
  30 #include <GeomAPI_Dir2d.h>
  31 #include <GeomAPI_Lin2d.h>
  32 #include <GeomAPI_Pnt2d.h>
  33 #include <GeomAPI_XY.h>
  34
  35 #include <GeomDataAPI_Point2D.h>
  36
  37 #include <Events_Loop.h>
  38
  39 #include <math.h>
  40
  41 const double tolerance = 1.e-7;
  42 const double paramTolerance = 1.e-4;
  43
  44 /// \brief Attract specified point on theNewArc to the attribute of theFeature
  45 static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
  46   FeaturePtr theFeature, const std::string& theFeatureAttribute);
  47
  48 /// \brief Calculates center of fillet arc and coordinates of tangency points
  49 static void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
  50                                   double theRadius, bool theNotInversed[2],
  51                                   std::shared_ptr<GeomAPI_XY>& theCenter,
  52                                   std::shared_ptr<GeomAPI_XY>& theTangentA,
  53                                   std::shared_ptr<GeomAPI_XY>& theTangentB);
  54
  55 /// Get point on 1/3 length of edge from fillet point
  56 static void getPointOnEdge(const FeaturePtr theFeature,
  57                            const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
  58                            std::shared_ptr<GeomAPI_Pnt2d>& thePoint);
  59
  60 /// Get distance from point to feature
  61 static double getProjectionDistance(const FeaturePtr theFeature,
  62                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint);
  63
  64 /// Get coincide edges for fillet
  65 static std::set<FeaturePtr> getCoincides(const FeaturePtr& theConstraintCoincidence);
  66
  67 static std::set<FeaturePtr> findFeaturesToRemove(const FeaturePtr theFeature,
  68                                                  const AttributePtr theAttribute);
  69
  70 SketchPlugin_Fillet::SketchPlugin_Fillet()
  71 : myFilletCreated(false)
  72 {
  73 }
  74
  75 void SketchPlugin_Fillet::initAttributes()
  76 {
  77   data()->addAttribute(FILLET_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
  78 }
  79
  80 void SketchPlugin_Fillet::execute()
  81 {
  82   // Wait all constraints being created, then send update events
  83   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
  84   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
  85   if (isUpdateFlushed)
  86     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
  87
  88   // Calculate Fillet parameters if does not yet
  89   if (!myBaseFeatures[0] || !myBaseFeatures[1])
  90     calculateFilletParameters();
  91
  92   // Create arc feature.
  93   FeaturePtr aFilletArc = sketch()->addFeature(SketchPlugin_Arc::ID());
  94
  95   // Set arc attributes.
  96   bool aWasBlocked = aFilletArc->data()->blockSendAttributeUpdated(true);
  97   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
  98       aFilletArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(myCenterXY->x(),
  99                                                                       myCenterXY->y());
 100   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint =
 101       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 102           aFilletArc->attribute(SketchPlugin_Arc::START_ID()));
 103   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint =
 104       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 105           aFilletArc->attribute(SketchPlugin_Arc::END_ID()));
 106   if(aStartPoint->isInitialized() && aEndPoint->isInitialized()
 107       && (aStartPoint->pnt()->xy()->distance(myTangentXY1) > tolerance
 108       || aEndPoint->pnt()->xy()->distance(myTangentXY2) > tolerance)) {
 109     std::dynamic_pointer_cast<SketchPlugin_Arc>(aFilletArc)->setReversed(false);
 110   }
 111   aStartPoint->setValue(myTangentXY1->x(), myTangentXY1->y());
 112   aEndPoint->setValue(myTangentXY2->x(), myTangentXY2->y());
 113   aFilletArc->data()->blockSendAttributeUpdated(aWasBlocked);
 114   aFilletArc->execute();
 115
 116   // Delete features with refs to points of edges.
 117   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint1;
 118   int aFeatInd1 = myIsReversed ? 1 : 0;
 119   int anAttrInd1 = (myIsReversed ? 2 : 0) + (myIsNotInversed[aFeatInd1] ? 0 : 1);
 120   aStartPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 121       myBaseFeatures[aFeatInd1]->attribute(myFeatAttributes[anAttrInd1]));
 122   std::set<FeaturePtr> aFeaturesToBeRemoved1 =
 123     findFeaturesToRemove(myBaseFeatures[aFeatInd1], aStartPoint1);
 124
 125   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint2;
 126   int aFeatInd2 = myIsReversed ? 0 : 1;
 127   int anAttrInd2 = (myIsReversed ? 0 : 2) + (myIsNotInversed[aFeatInd2] ? 0 : 1);
 128   aStartPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 129       myBaseFeatures[aFeatInd2]->attribute(myFeatAttributes[anAttrInd2]));
 130   std::set<FeaturePtr> aFeaturesToBeRemoved2 =
 131     findFeaturesToRemove(myBaseFeatures[aFeatInd2], aStartPoint2);
 132
 133   aFeaturesToBeRemoved1.insert(aFeaturesToBeRemoved2.begin(), aFeaturesToBeRemoved2.end());
 134   ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved1);
 135   Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
 136
 137   // Update fillet edges.
 138   recalculateAttributes(aFilletArc, SketchPlugin_Arc::START_ID(),
 139                         myBaseFeatures[aFeatInd1], myFeatAttributes[anAttrInd1]);
 140   recalculateAttributes(aFilletArc, SketchPlugin_Arc::END_ID(),
 141                         myBaseFeatures[aFeatInd2], myFeatAttributes[anAttrInd2]);
 142
 143   // Create coincidence features.
 144   FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 145   AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 146       aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 147   aRefAttr->setAttr(aFilletArc->attribute(SketchPlugin_Arc::START_ID()));
 148   aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 149       aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 150   aRefAttr->setAttr(myBaseFeatures[aFeatInd1]->attribute(myFeatAttributes[anAttrInd1]));
 151   aConstraint->execute();
 152   ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 153   aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 154   aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 155       aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 156   aRefAttr->setAttr(aFilletArc->attribute(SketchPlugin_Arc::END_ID()));
 157   aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 158       aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 159   aRefAttr->setAttr(myBaseFeatures[aFeatInd2]->attribute(myFeatAttributes[anAttrInd2]));
 160   aConstraint->execute();
 161   ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 162
 163   // Create tangent features.
 164   for (int i = 0; i < 2; i++) {
 165     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 166     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 167         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 168     aRefAttr->setObject(aFilletArc->lastResult());
 169     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 170         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 171     bool isArc = myBaseFeatures[i]->getKind() == SketchPlugin_Arc::ID();
 172     aRefAttr->setObject(isArc ? myBaseFeatures[i]->lastResult() :
 173                                 myBaseFeatures[i]->firstResult());
 174     aConstraint->execute();
 175     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 176   }
 177
 178   // Send events to update the sub-features by the solver.
 179   if(isUpdateFlushed) {
 180     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 181   }
 182
 183   myFilletCreated = true;
 184 }
 185
 186 AISObjectPtr SketchPlugin_Fillet::getAISObject(AISObjectPtr thePrevious)
 187 {
 188   if(myFilletCreated) {
 189     return AISObjectPtr();
 190   }
 191
 192   SketchPlugin_Sketch* aSketch = sketch();
 193   if(!aSketch) {
 194     return AISObjectPtr();
 195   }
 196
 197   if (!calculateFilletParameters())
 198     return AISObjectPtr();
 199
 200   // Create arc for presentation.
 201   std::shared_ptr<GeomAPI_Pnt> aCenterPnt(aSketch->to3D(myCenterXY->x(), myCenterXY->y()));
 202   std::shared_ptr<GeomAPI_Pnt> aTangentPnt1(aSketch->to3D(myTangentXY1->x(),
 203                                                           myTangentXY1->y()));
 204   std::shared_ptr<GeomAPI_Pnt> aTangentPnt2(aSketch->to3D(myTangentXY2->x(),
 205                                                           myTangentXY2->y()));
 206   std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 207     aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 208   std::shared_ptr<GeomAPI_Shape> anArcShape =
 209       GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenterPnt, aTangentPnt1, aTangentPnt2, aNDir->dir());
 210
 211   AISObjectPtr anAISObject = thePrevious;
 212   if(!anAISObject.get()) {
 213     anAISObject = AISObjectPtr(new GeomAPI_AISObject);
 214   }
 215   anAISObject->createShape(anArcShape);
 216   return anAISObject;
 217 }
 218
 219 bool SketchPlugin_Fillet::calculateFilletParameters()
 220 {
 221   // Get fillet point.
 222   AttributeRefAttrPtr aPointRefAttr = refattr(FILLET_POINT_ID());
 223   if (!aPointRefAttr->isInitialized() || aPointRefAttr->isObject())
 224     return false;
 225   std::shared_ptr<GeomDataAPI_Point2D> aFilletPoint2D =
 226     std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aPointRefAttr->attr());
 227   if (!aFilletPoint2D.get())
 228     return false;
 229
 230   if (!findFeaturesContainingFilletPoint(aFilletPoint2D)) {
 231     setError("Error: Selected point does not have two suitable edges for fillet.");
 232     return false;
 233   }
 234
 235   // Getting points located at 1/3 of edge length from fillet point.
 236   std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt2d = aFilletPoint2D->pnt();
 237   std::shared_ptr<GeomAPI_Pnt2d> aPnt1, aPnt2;
 238   getPointOnEdge(myBaseFeatures[0], aFilletPnt2d, aPnt1);
 239   getPointOnEdge(myBaseFeatures[1], aFilletPnt2d, aPnt2);
 240
 241   /// Getting distances.
 242   double aDistance1 = getProjectionDistance(myBaseFeatures[1], aPnt1);
 243   double aDistance2 = getProjectionDistance(myBaseFeatures[0], aPnt2);
 244
 245   // Calculate radius value for fillet.
 246   double aRadius = aDistance1 < aDistance2 ? aDistance1 / 2.0 : aDistance2 / 2.0;
 247
 248   // Calculate arc attributes.
 249   static const int aNbFeatures = 2;
 250   // First pair of points relate to first feature, second pair -  to second.
 251   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2];
 252   for (int i = 0; i < aNbFeatures; i++) {
 253     std::string aStartAttr, aEndAttr;
 254     if (myBaseFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
 255       aStartAttr = SketchPlugin_Line::START_ID();
 256       aEndAttr = SketchPlugin_Line::END_ID();
 257     } else if (myBaseFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
 258       aStartAttr = SketchPlugin_Arc::START_ID();
 259       aEndAttr = SketchPlugin_Arc::END_ID();
 260     } else { // Wrong argument.
 261       setError("Error: One of the points has wrong coincide feature");
 262       return false;
 263     }
 264     myFeatAttributes[2*i] = aStartAttr;
 265     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 266       myBaseFeatures[i]->attribute(aStartAttr))->pnt();
 267     myFeatAttributes[2*i+1] = aEndAttr;
 268     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 269       myBaseFeatures[i]->attribute(aEndAttr))->pnt();
 270   }
 271   for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
 272     for (int j = 0; j < 2; j++) // loop on start-end of each feature
 273       if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPnt2d) < 1.e-10) {
 274         myIsNotInversed[aFeatInd] = (j==0);
 275         break;
 276       }
 277   }
 278
 279   calculateFilletCenter(myBaseFeatures[0], myBaseFeatures[1], aRadius,
 280       myIsNotInversed, myCenterXY, myTangentXY1, myTangentXY2);
 281
 282   // Tangent directions of the features in coincident point.
 283   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures];
 284   for (int i = 0; i < aNbFeatures; i++) {
 285     std::shared_ptr<GeomAPI_XY> aDir;
 286     if (myBaseFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
 287       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 288       if (!myIsNotInversed[i])
 289         aDir = aDir->multiplied(-1.0);
 290     } else if (myBaseFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
 291       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 292         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 293         myBaseFeatures[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 294       aDir = myIsNotInversed[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 295       aDir = aDir->decreased(aCenterPoint->xy());
 296
 297       double x = aDir->x();
 298       double y = aDir->y();
 299       aDir->setX(-y);
 300       aDir->setY(x);
 301       if (myIsNotInversed[i] ==
 302           std::dynamic_pointer_cast<SketchPlugin_Arc>(myBaseFeatures[i])->isReversed())
 303         aDir = aDir->multiplied(-1.0);
 304     }
 305     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 306   }
 307
 308   // By default, the start point of fillet arc is connected to FeatureA,
 309   // and the end point - to FeatureB. But when the angle between TangentDirA and
 310   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 311   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A),
 312   // where A and B - angles between corresponding tanget direction and the X axis
 313   myIsReversed = cosBA > 0.0;
 314
 315   if(myIsReversed) {
 316     std::shared_ptr<GeomAPI_XY> aTmp = myTangentXY1;
 317     myTangentXY1 = myTangentXY2;
 318     myTangentXY2 = aTmp;
 319   }
 320   return true;
 321 }
 322
 323 bool SketchPlugin_Fillet::findFeaturesContainingFilletPoint(
 324     std::shared_ptr<GeomDataAPI_Point2D> theFilletPoint)
 325 {
 326   // Obtain constraint coincidence for the fillet point.
 327   FeaturePtr aConstraintCoincidence;
 328   const std::set<AttributePtr>& aRefsList = theFilletPoint->owner()->data()->refsToMe();
 329   for(std::set<AttributePtr>::const_iterator anIt = aRefsList.cbegin();
 330       anIt != aRefsList.cend();
 331       ++anIt) {
 332     std::shared_ptr<ModelAPI_Attribute> anAttr = (*anIt);
 333     FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
 334     if(aFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 335       AttributeRefAttrPtr anAttrRefA =
 336           aFeature->refattr(SketchPlugin_ConstraintCoincidence::ENTITY_A());
 337       AttributeRefAttrPtr anAttrRefB =
 338           aFeature->refattr(SketchPlugin_ConstraintCoincidence::ENTITY_B());
 339       if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 340         AttributePtr anAttrA = anAttrRefA->attr();
 341         if(theFilletPoint == anAttrA) {
 342           aConstraintCoincidence = aFeature;
 343           break;
 344         }
 345       }
 346       if(anAttrRefB.get() && !anAttrRefB->isObject()) {
 347         AttributePtr anAttrB = anAttrRefB->attr();
 348         if(theFilletPoint == anAttrB) {
 349           aConstraintCoincidence = aFeature;
 350           break;
 351         }
 352       }
 353     }
 354   }
 355
 356   if(!aConstraintCoincidence.get())
 357     return false;
 358
 359   // Get coincide edges.
 360   std::set<FeaturePtr> anEdgeFeatures = getCoincides(aConstraintCoincidence);
 361   std::set<FeaturePtr>::iterator aLinesIt = anEdgeFeatures.begin();
 362   for (int i = 0; aLinesIt != anEdgeFeatures.end() && i < 2; ++aLinesIt, ++i)
 363     myBaseFeatures[i] = *aLinesIt;
 364
 365   return myBaseFeatures[0] && myBaseFeatures[1];
 366 }
 367
 368 // =========   Auxiliary functions   =================
 369 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 370                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 371 {
 372   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 373       theNewArc->attribute(theNewArcAttribute))->pnt();
 374   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 375       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 376 }
 377
 378 /// \brief Find intersections of lines shifted along normal direction
 379 void possibleFilletCenterLineLine(
 380     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 381     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 382     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 383 {
 384   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 385   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 386   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 387   double aDet = theDirA->cross(theDirB);
 388   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 389     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 390     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 391       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 392       double aVX = aDirAT->xy()->dot(aPntA);
 393       double aVY = aDirBT->xy()->dot(aPntB);
 394       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 395           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 396           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 397       theCenters.push_back(aPoint);
 398     }
 399   }
 400 }
 401
 402 /// \brief Find intersections of line shifted along normal direction in both sides
 403 ///        and a circle with extended radius
 404 void possibleFilletCenterLineArc(
 405     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 406     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 407     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 408 {
 409   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 410   std::shared_ptr<GeomAPI_XY> aPnt;
 411   double aDirNorm2 = theDirLine->dot(theDirLine);
 412   double aRad = 0.0;
 413   double aDirX = theDirLine->x();
 414   double aDirX2 = theDirLine->x() * theDirLine->x();
 415   double aDirY2 = theDirLine->y() * theDirLine->y();
 416   double aDirXY = theDirLine->x() * theDirLine->y();
 417   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 418     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 419     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 420     double aCoeff2 = aCoeff * aCoeff;
 421     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 422       aRad = theRadiusArc + aStepB * theRadius;
 423       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 424       if (aD < 0.0)
 425         continue;
 426       double aDs = sqrt(aD);
 427       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 428       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 429       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 430           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 431       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 432           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 433
 434       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 435       theCenters.push_back(aPoint1);
 436       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 437       theCenters.push_back(aPoint2);
 438     }
 439   }
 440 }
 441
 442 /// \brief Find intersections of two circles with extended radii
 443 void possibleFilletCenterArcArc(
 444     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 445     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 446     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 447 {
 448   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 449   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 450   double aCenterDist = sqrt(aCenterDist2);
 451
 452   double aRadA, aRadB;
 453   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 454     aRadA = theRadiusA + aStepA * theRadius;
 455     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 456       aRadB = theRadiusB + aStepB * theRadius;
 457       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 458         continue; // there is no intersections
 459
 460       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 461       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 462
 463       double x1 = theCenterA->x() +
 464         (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 465       double y1 = theCenterA->y() +
 466         (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 467
 468       double x2 = theCenterA->x() +
 469         (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 470       double y2 = theCenterA->y() +
 471         (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 472
 473       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 474       theCenters.push_back(aPoint1);
 475       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 476       theCenters.push_back(aPoint2);
 477     }
 478   }
 479 }
 480
 481 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 482                            double theRadius, bool theNotInversed[2],
 483                            std::shared_ptr<GeomAPI_XY>& theCenter,
 484                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 485                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 486 {
 487   static const int aNbFeatures = 2;
 488   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 489   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 490   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 491
 492   for (int i = 0; i < aNbFeatures; i++) {
 493     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 494       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 495           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 496       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 497           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 498     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 499       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 500           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 501       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 502           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 503       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 504           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 505     } else
 506       return;
 507     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 508         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 509         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 510     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 511         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 512         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 513   }
 514
 515   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 516       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 517     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 518     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 519     for (int i = 0; i < aNbFeatures; i++) {
 520       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 521       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 522     }
 523
 524     // get and filter possible centers
 525     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 526     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1],
 527                                  theRadius, aSuspectCenters);
 528     double aDot = 0.0;
 529     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 530     for (; anIt != aSuspectCenters.end(); anIt++) {
 531       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 532       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 533       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 534         continue; // incorrect position
 535       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 536       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 537       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 538         continue; // incorrect position
 539       // the center is found, stop searching
 540       theCenter = *anIt;
 541       return;
 542     }
 543   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 544       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 545       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 546       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 547     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 548     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 549     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 550         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 551     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 552         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 553
 554     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 555         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 556     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 557         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 558     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 559
 560     // get possible centers and filter them
 561     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 562     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd],
 563                                 anArcRadius, theRadius, aSuspectCenters);
 564     double aDot = 0.0;
 565     // the line is forward into the arc
 566     double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
 567     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 568     // The possible centers are ranged by their positions.
 569     // If the point is not satisfy one of criteria, the weight is decreased with penalty.
 570     int aBestWeight = 0;
 571     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 572     for (; anIt != aSuspectCenters.end(); anIt++) {
 573       int aWeight = 2;
 574       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 575       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 576       // Check the point is placed on the correct arc (penalty if false)
 577       if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
 578         aWeight -= 1;
 579       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 580           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 581       double aCurAngle = aCurDir->angle(aStartArcDir);
 582       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 583       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 584         continue;
 585       if (aWeight > aBestWeight)
 586         aBestWeight = aWeight;
 587       else if (aWeight < aBestWeight ||
 588                aStart[aLineInd]->distance(*anIt) >
 589                aStart[aLineInd]->distance(theCenter)) // <-- take closer point
 590         continue;
 591       // the center is found, stop searching
 592       theCenter = *anIt;
 593       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 594       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 595         theTangentA = aLineTgPoint;
 596         theTangentB = anArcTgPoint;
 597       } else {
 598         theTangentA = anArcTgPoint;
 599         theTangentB = aLineTgPoint;
 600       }
 601       //return;
 602     }
 603   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 604       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 605     double anArcRadius[aNbFeatures];
 606     double anArcAngle[aNbFeatures];
 607     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 608     for (int i = 0; i < aNbFeatures; i++) {
 609       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 610       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 611           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 612       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 613           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 614       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 615     }
 616
 617     // get and filter possible centers
 618     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 619     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1],
 620                                anArcRadius[1], theRadius, aSuspectCenters);
 621     double aDot = 0.0;
 622     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 623     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 624     for (; anIt != aSuspectCenters.end(); anIt++) {
 625       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 626           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 627       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 628       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 629       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 630         continue; // incorrect position
 631       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 632
 633       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 634       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 635       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 636       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 637         continue; // incorrect position
 638       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 639
 640       // the center is found, stop searching
 641       theCenter = *anIt;
 642       return;
 643     }
 644   }
 645 }
 646
 647 void getPointOnEdge(const FeaturePtr theFeature,
 648                     const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
 649                     std::shared_ptr<GeomAPI_Pnt2d>& thePoint) {
 650   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 651     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 652       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 653     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 654       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 655     if(aPntStart->distance(theFilletPoint) > 1.e-7) {
 656       aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 657         theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 658       aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 659         theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 660     }
 661     thePoint.reset(
 662       new GeomAPI_Pnt2d(aPntStart->xy()->added(
 663       aPntEnd->xy()->decreased( aPntStart->xy() )->multiplied(1.0 / 3.0) ) ) );
 664   } else {
 665     std::shared_ptr<GeomAPI_Pnt2d> aPntTemp;
 666     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 667       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 668     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 669       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 670     if(theFeature->attribute(SketchPlugin_Arc::REVERSED_ID())) {
 671       aPntTemp = aPntStart;
 672       aPntStart = aPntEnd;
 673       aPntEnd = aPntTemp;
 674     }
 675     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 676       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 677     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 678     double aStartParameter(0), anEndParameter(0);
 679     aCirc->parameter(aPntStart, paramTolerance, aStartParameter);
 680     aCirc->parameter(aPntEnd, paramTolerance, anEndParameter);
 681     if(aPntStart->distance(theFilletPoint) > tolerance) {
 682       double aTmpParameter = aStartParameter;
 683       aStartParameter = anEndParameter;
 684       anEndParameter = aTmpParameter;
 685     }
 686     double aPntParameter = aStartParameter + (anEndParameter - aStartParameter) / 3.0;
 687     aCirc->D0(aPntParameter, thePoint);
 688   }
 689 }
 690
 691 double getProjectionDistance(const FeaturePtr theFeature,
 692                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint)
 693 {
 694   std::shared_ptr<GeomAPI_Pnt2d> aProjectPnt;
 695   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 696     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 697       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 698     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 699       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 700     std::shared_ptr<GeomAPI_Lin2d> aLin(new GeomAPI_Lin2d(aPntStart, aPntEnd));
 701     aProjectPnt = aLin->project(thePoint);
 702   } else {
 703     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 704       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 705     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 706       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 707     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 708       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 709     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 710     aProjectPnt = aCirc->project(thePoint);
 711   }
 712   if(aProjectPnt.get()) {
 713     return aProjectPnt->distance(thePoint);
 714   }
 715   return -1;
 716 }
 717
 718 std::set<FeaturePtr> getCoincides(const FeaturePtr& theConstraintCoincidence)
 719 {
 720   std::set<FeaturePtr> aCoincides;
 721
 722   std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt =
 723     SketchPlugin_Tools::getCoincidencePoint(theConstraintCoincidence);
 724
 725   SketchPlugin_Tools::findCoincidences(theConstraintCoincidence,
 726                                        SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 727                                        aCoincides);
 728   SketchPlugin_Tools::findCoincidences(theConstraintCoincidence,
 729                                        SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 730                                        aCoincides);
 731
 732   // Remove points from set of coincides.
 733   std::set<FeaturePtr> aNewSetOfCoincides;
 734   for(std::set<FeaturePtr>::iterator anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
 735     std::shared_ptr<SketchPlugin_SketchEntity> aSketchEntity =
 736       std::dynamic_pointer_cast<SketchPlugin_SketchEntity>(*anIt);
 737     if(aSketchEntity.get() && aSketchEntity->isCopy()) {
 738       continue;
 739     }
 740     if((*anIt)->getKind() == SketchPlugin_Line::ID()) {
 741       aNewSetOfCoincides.insert(*anIt);
 742     } else if((*anIt)->getKind() == SketchPlugin_Arc::ID()) {
 743       AttributePtr anAttrCenter = (*anIt)->attribute(SketchPlugin_Arc::CENTER_ID());
 744       std::shared_ptr<GeomDataAPI_Point2D> aPointCenter2D =
 745         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrCenter);
 746       if(aPointCenter2D.get() && aFilletPnt->isEqual(aPointCenter2D->pnt())) {
 747         continue;
 748       }
 749       aNewSetOfCoincides.insert(*anIt);
 750     }
 751   }
 752   aCoincides = aNewSetOfCoincides;
 753
 754   // If we still have more than two coincides remove auxilary entities from set of coincides.
 755   if(aCoincides.size() > 2) {
 756     aNewSetOfCoincides.clear();
 757     for(std::set<FeaturePtr>::iterator
 758         anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
 759       if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 760         aNewSetOfCoincides.insert(*anIt);
 761       }
 762     }
 763     aCoincides = aNewSetOfCoincides;
 764   }
 765
 766   return aCoincides;
 767 }
 768
 769 std::set<FeaturePtr> findFeaturesToRemove(const FeaturePtr theFeature,
 770                                           const AttributePtr theAttribute) {
 771   std::set<FeaturePtr> aFeaturesToBeRemoved;
 772   std::set<AttributePtr> aRefs = theFeature->data()->refsToMe();
 773   std::list<ResultPtr> aResults = theFeature->results();
 774   for(std::list<ResultPtr>::const_iterator aResultsIt = aResults.cbegin();
 775       aResultsIt != aResults.cend();
 776       ++aResultsIt) {
 777     ResultPtr aResult = *aResultsIt;
 778     std::set<AttributePtr> aResultRefs = aResult->data()->refsToMe();
 779     aRefs.insert(aResultRefs.begin(), aResultRefs.end());
 780   }
 781   for(std::set<AttributePtr>::const_iterator anIt = aRefs.cbegin();
 782     anIt != aRefs.cend();
 783     ++anIt) {
 784     std::shared_ptr<ModelAPI_Attribute> anAttr = (*anIt);
 785     FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
 786     if(aFeature->getKind() == SketchPlugin_Fillet::ID()) {
 787       continue;
 788     }
 789     if(aFeature->getKind() == SketchPlugin_ConstraintLength::ID()
 790         || aFeature->getKind() == SketchPlugin_ConstraintEqual::ID()) {
 791       aFeaturesToBeRemoved.insert(aFeature);
 792     } else {
 793       std::list<AttributePtr> anAttrs =
 794           aFeature->data()->attributes(ModelAPI_AttributeRefAttr::typeId());
 795       for(std::list<AttributePtr>::const_iterator aRefAttrsIt = anAttrs.cbegin();
 796           aRefAttrsIt != anAttrs.cend();
 797           ++aRefAttrsIt) {
 798         AttributeRefAttrPtr anAttrRefAttr =
 799           std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(*aRefAttrsIt);
 800         if(anAttrRefAttr.get() && anAttrRefAttr->attr() == theAttribute) {
 801           aFeaturesToBeRemoved.insert(aFeature);
 802         }
 803       }
 804     }
 805   }
 806   return aFeaturesToBeRemoved;
 807 }