src/SketchPlugin/SketchPlugin_ConstraintFillet.cpp

   1 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D -->
   2
   3 // File:    SketchPlugin_ConstraintFillet.cpp
   4 // Created: 19 Mar 2015
   5 // Author:  Artem ZHIDKOV
   6
   7 #include "SketchPlugin_ConstraintFillet.h"
   8
   9 #include <GeomAPI_Dir2d.h>
  10 #include <GeomAPI_Pnt2d.h>
  11 #include <GeomAPI_XY.h>
  12 #include <GeomDataAPI_Point2D.h>
  13 #include <ModelAPI_AttributeDouble.h>
  14 #include <ModelAPI_AttributeRefAttr.h>
  15 #include <ModelAPI_AttributeRefList.h>
  16 #include <ModelAPI_Data.h>
  17 #include <ModelAPI_Events.h>
  18 #include <ModelAPI_ResultConstruction.h>
  19 #include <ModelAPI_Session.h>
  20 #include <ModelAPI_Validator.h>
  21
  22 #include <SketchPlugin_Arc.h>
  23 #include <SketchPlugin_Line.h>
  24 #include <SketchPlugin_Sketch.h>
  25 #include <SketchPlugin_ConstraintCoincidence.h>
  26 #include <SketchPlugin_ConstraintTangent.h>
  27 #include <SketchPlugin_ConstraintRadius.h>
  28 #include <SketchPlugin_Tools.h>
  29
  30 #include <SketcherPrs_Factory.h>
  31 #include <SketcherPrs_Tools.h>
  32
  33 #include <Config_PropManager.h>
  34 #include <Events_Loop.h>
  35
  36 #define _USE_MATH_DEFINES
  37 #include <math.h>
  38
  39 static const std::string PREVIOUS_VALUE("FilletPreviousRadius");
  40
  41 /// \brief Attract specified point on theNewArc to the attribute of theFeature
  42 static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
  43   FeaturePtr theFeature, const std::string& theFeatureAttribute);
  44
  45 /// \brief Calculates center of fillet arc and coordinates of tangency points
  46 static void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
  47                                   double theRadius, bool theNotInversed[2],
  48                                   std::shared_ptr<GeomAPI_XY>& theCenter,
  49                                   std::shared_ptr<GeomAPI_XY>& theTangentA,
  50                                   std::shared_ptr<GeomAPI_XY>& theTangentB);
  51
  52 SketchPlugin_ConstraintFillet::SketchPlugin_ConstraintFillet()
  53 {
  54 }
  55
  56 void SketchPlugin_ConstraintFillet::initAttributes()
  57 {
  58   data()->addAttribute(SketchPlugin_Constraint::VALUE(), ModelAPI_AttributeDouble::typeId());
  59   data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefAttr::typeId());
  60   data()->addAttribute(SketchPlugin_Constraint::ENTITY_B(), ModelAPI_AttributeRefList::typeId());
  61   // This attribute used to store base edges
  62   data()->addAttribute(SketchPlugin_Constraint::ENTITY_C(), ModelAPI_AttributeRefList::typeId());
  63   data()->addAttribute(PREVIOUS_VALUE, ModelAPI_AttributeDouble::typeId());
  64   // initialize attribute not applicable for user
  65   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_B());
  66   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_C());
  67   data()->attribute(PREVIOUS_VALUE)->setInitialized();
  68   std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(PREVIOUS_VALUE))->setValue(0.0);
  69 }
  70
  71 void SketchPlugin_ConstraintFillet::execute()
  72 {
  73   // the viewer update should be blocked in order to avoid the temporaty fillet sub-features visualization
  74   // before they are processed by the solver
  75   //std::shared_ptr<Events_Message> aMsg = std::shared_ptr<Events_Message>(
  76   //    new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_BLOCKED)));
  77   //Events_Loop::loop()->send(aMsg);
  78
  79   std::shared_ptr<ModelAPI_Data> aData = data();
  80   ResultConstructionPtr aRC;
  81   // Check the base objects are initialized
  82   double aFilletRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
  83       aData->attribute(SketchPlugin_Constraint::VALUE()))->value();
  84   AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
  85       aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
  86   if (!aBaseA->isInitialized() || aBaseA->isObject()) {
  87     setError("Bad vertex selected");
  88     return;
  89   }
  90
  91   // Check the fillet shapes is not initialized yet
  92   AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
  93       aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
  94   bool needNewObjects = aRefListOfFillet->size() == 0;
  95
  96   AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
  97       aData->attribute(SketchPlugin_Constraint::ENTITY_C()));
  98
  99   // Obtain base features
 100   FeaturePtr anOldFeatureA, anOldFeatureB;
 101   std::list<ObjectPtr> aNewFeatList = aRefListOfBaseLines->list();
 102   std::list<ObjectPtr>::iterator aFeatIt = aNewFeatList.begin();
 103   anOldFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 104   anOldFeatureB = ModelAPI_Feature::feature(*aFeatIt);
 105
 106
 107   if(!anOldFeatureA.get() || !anOldFeatureB.get()) {
 108     setError("One of the edges is empty");
 109     return;
 110   }
 111
 112   FeaturePtr aNewFeatureA, aNewFeatureB, aNewArc;
 113   if (needNewObjects) {
 114     // Create list of objects composing a fillet
 115     // copy aFeatureA
 116     aNewFeatureA = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureA, sketch());
 117     // copy aFeatureB
 118     aNewFeatureB = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureB, sketch());
 119     // create filleting arc (it will be attached to the list later)
 120     aNewArc = sketch()->addFeature(SketchPlugin_Arc::ID());
 121   } else {
 122     // Obtain features from the list
 123     std::list<ObjectPtr> aNewFeatList = aRefListOfFillet->list();
 124     std::list<ObjectPtr>::iterator aFeatIt = aNewFeatList.begin();
 125     aNewFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 126     aNewFeatureB = ModelAPI_Feature::feature(*aFeatIt++);
 127     aNewArc = ModelAPI_Feature::feature(*aFeatIt);
 128   }
 129
 130   // Calculate arc attributes
 131   static const int aNbFeatures = 2;
 132   FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 133   FeaturePtr aNewFeature[aNbFeatures] = {aNewFeatureA, aNewFeatureB};
 134   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures]; // tangent directions of the features in coincident point
 135   bool isStart[aNbFeatures]; // indicates which point the features share
 136   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2]; // first pair of points relate to first feature, second pair -  to second
 137   std::string aFeatAttributes[aNbFeatures * 2]; // attributes of features
 138   for (int i = 0; i < aNbFeatures; i++) {
 139     std::string aStartAttr, aEndAttr;
 140     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 141       aStartAttr = SketchPlugin_Line::START_ID();
 142       aEndAttr = SketchPlugin_Line::END_ID();
 143     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 144       aStartAttr = SketchPlugin_Arc::START_ID();
 145       aEndAttr = SketchPlugin_Arc::END_ID();
 146     } else { // wrong argument
 147       aRefListOfFillet->remove(aNewFeatureA);
 148       aRefListOfFillet->remove(aNewFeatureB);
 149       aRefListOfFillet->remove(aNewArc);
 150       aRefListOfBaseLines->clear();
 151       return;
 152     }
 153     aFeatAttributes[2*i] = aStartAttr;
 154     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 155         aFeature[i]->attribute(aStartAttr))->pnt();
 156     aFeatAttributes[2*i+1] = aEndAttr;
 157     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 158         aFeature[i]->attribute(aEndAttr))->pnt();
 159   }
 160   for (int i = 0; i < aNbFeatures; i++) {
 161     int j = aNbFeatures;
 162     for (; j < 2 * aNbFeatures; j++)
 163       if (aStartEndPnt[i]->distance(aStartEndPnt[j]) < 1.e-10) {
 164         isStart[0] = i==0;
 165         isStart[1] = j==aNbFeatures;
 166         break;
 167       }
 168     if (j < 2 * aNbFeatures)
 169       break;
 170   }
 171   // tangent directions of the features
 172   for (int i = 0; i < aNbFeatures; i++) {
 173     std::shared_ptr<GeomAPI_XY> aDir;
 174     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 175       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 176       if (!isStart[i])
 177         aDir = aDir->multiplied(-1.0);
 178     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 179       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 180           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 181           aNewFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 182       aDir = isStart[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 183       aDir = aDir->decreased(aCenterPoint->xy());
 184
 185       double x = aDir->x();
 186       double y = aDir->y();
 187       aDir->setX(-y);
 188       aDir->setY(x);
 189       if (!isStart[i])
 190         aDir = aDir->multiplied(-1.0);
 191     }
 192     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 193   }
 194
 195   // Wait all constraints being created, then send update events
 196   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 197   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 198   if (isUpdateFlushed)
 199     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 200
 201   // By default, the start point of fillet arc is connected to FeatureA,
 202   // and the end point - to FeatureB. But when the angle between TangentDirA and
 203   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 204   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A), where A and B - angles between corresponding tanget direction and the X axis
 205   bool isReversed = cosBA > 0.0;
 206
 207   // Calculate fillet arc parameters
 208   std::shared_ptr<GeomAPI_XY> aCenter, aTangentPntA, aTangentPntB;
 209   calculateFilletCenter(anOldFeatureA, anOldFeatureB, aFilletRadius, isStart, aCenter, aTangentPntA, aTangentPntB);
 210   // update features
 211   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 212       aNewFeatureA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(
 213       aTangentPntA->x(), aTangentPntA->y());
 214   aNewFeatureA->execute();
 215   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 216       aNewFeatureB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(
 217       aTangentPntB->x(), aTangentPntB->y());
 218   aNewFeatureB->execute();
 219   // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
 220   // by arc; moreover, it may cause cyclicity in hte mechanism of updater
 221   aNewArc->data()->blockSendAttributeUpdated(true);
 222   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 223       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 224       aCenter->x(), aCenter->y());
 225   if (isReversed) {
 226     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 227     aTangentPntA = aTangentPntB;
 228     aTangentPntB = aTmp;
 229   }
 230   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 231       aNewArc->attribute(SketchPlugin_Arc::START_ID()))->setValue(aTangentPntA->x(), aTangentPntA->y());
 232   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 233       aNewArc->attribute(SketchPlugin_Arc::END_ID()))->setValue(aTangentPntB->x(), aTangentPntB->y());
 234   aNewArc->data()->blockSendAttributeUpdated(false);
 235   aNewArc->execute();
 236
 237   if (needNewObjects) {
 238     // attach new arc to the list
 239     aRefListOfFillet->append(aNewFeatureA->lastResult());
 240     aRefListOfFillet->append(aNewFeatureB->lastResult());
 241     aRefListOfFillet->append(aNewArc->lastResult());
 242
 243     // attach base lines to the list
 244     aRefListOfBaseLines->append(anOldFeatureA);
 245     aRefListOfBaseLines->append(anOldFeatureB);
 246
 247     myProducedFeatures.push_back(aNewFeatureA);
 248     myProducedFeatures.push_back(aNewFeatureB);
 249     myProducedFeatures.push_back(aNewArc);
 250
 251     // Create list of additional constraints:
 252     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 253     // 1.1. coincidence
 254     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 255     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 256         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 257     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 258     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 259         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 260     int aFeatInd = isReversed ? 1 : 0;
 261     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 262     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 263     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 264     aConstraint->execute();
 265     myProducedFeatures.push_back(aConstraint);
 266     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 267     // 1.2. coincidence
 268     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 269     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 270         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 271     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 272     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 273         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 274     aFeatInd = isReversed ? 0 : 1;
 275     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 276     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 277     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 278     aConstraint->execute();
 279     myProducedFeatures.push_back(aConstraint);
 280     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 281     // 2. Fillet arc radius
 282     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 283     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 284     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 285     //aRefAttr->setObject(aNewArc->lastResult());
 286     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 287     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 288     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 289     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 290     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 291     //aConstraint->execute();
 292     //myProducedFeatures.push_back(aConstraint);
 293     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 294     // 3. Tangency of fillet arc and features
 295     for (int i = 0; i < aNbFeatures; i++) {
 296       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 297       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 298           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 299       aRefAttr->setObject(aNewArc->lastResult());
 300       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 301           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 302       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 303       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 304       aConstraint->execute();
 305       myProducedFeatures.push_back(aConstraint);
 306       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 307     }
 308     // 4. Coincidence of free boundaries of base and copied features
 309     for (int i = 0; i < aNbFeatures; i++) {
 310       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 311       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 312       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 313           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 314       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 315       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 316           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 317       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 318       myProducedFeatures.push_back(aConstraint);
 319     }
 320     // 5. Tangent points should be placed on the base features
 321     for (int i = 0; i < aNbFeatures; i++) {
 322       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 323       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 324       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 325           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 326       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 327       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 328           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 329       aRefAttr->setObject(aFeature[i]->lastResult());
 330       myProducedFeatures.push_back(aConstraint);
 331     }
 332     // make base features auxiliary
 333     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 334     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 335     myBaseObjects.clear();
 336     myBaseObjects.push_back(anOldFeatureA);
 337     myBaseObjects.push_back(anOldFeatureB);
 338     // exchange the naming IDs of newly created and old line that become auxiliary
 339     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 340     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 341   } else {
 342     // Update radius value
 343     int aNbSubs = sketch()->numberOfSubs();
 344     FeaturePtr aSubFeature;
 345     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 346       aSubFeature = sketch()->subFeature(aSub);
 347       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 348         continue;
 349       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 350           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 351       if (!aRefAttr || !aRefAttr->isObject())
 352         continue;
 353       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 354       if (aFeature == aNewArc) {
 355         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 356           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 357         aRadius->setValue(aFilletRadius);
 358         break;
 359       }
 360     }
 361   }
 362
 363   // send events to update the sub-features by the solver
 364   if (isUpdateFlushed)
 365     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 366
 367   // the viewer update should be unblocked in order after the fillet features
 368   // are processed by the solver
 369   //aMsg = std::shared_ptr<Events_Message>(
 370   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 371   //Events_Loop::loop()->send(aMsg);
 372 }
 373
 374 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 375 {
 376   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 377     // clear the list of fillet entities
 378     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 379         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 380     aRefListOfFillet->clear();
 381
 382     // clear the list of base features
 383     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 384         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 385       aRefListOfBaseLines->clear();
 386
 387     // remove all produced objects and constraints
 388     DocumentPtr aDoc = sketch()->document();
 389     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 390     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 391       aDoc->removeFeature(*aCIt);
 392     myProducedFeatures.clear();
 393
 394     // clear auxiliary flag on initial objects
 395     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 396       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 397     myBaseObjects.clear();
 398
 399     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 400         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 401     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 402       return;
 403     }
 404
 405     AttributePtr anAttrBase = aBaseA->attr();
 406     const std::set<AttributePtr>& aRefsList = anAttrBase->owner()->data()->refsToMe();
 407     std::set<AttributePtr>::const_iterator aIt;
 408     FeaturePtr aCoincident;
 409     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 410       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 411       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 412       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 413         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 414           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 415         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 416           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 417         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 418           AttributePtr anAttrA = anAttrRefA->attr();
 419           if(anAttrBase == anAttrA) {
 420             aCoincident = aConstrFeature;
 421             break;
 422           }
 423         }
 424         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 425           AttributePtr anAttrB = anAttrRefB->attr();
 426           if(anAttrBase == anAttrB) {
 427             aCoincident = aConstrFeature;
 428             break;
 429           }
 430         }
 431       }
 432     }
 433
 434     if(!aCoincident.get()) {
 435       setError("No coincident edges at selected vertex");
 436       return;
 437     }
 438
 439     std::set<FeaturePtr> aCoinsideLines;
 440     SketchPlugin_Tools::findCoincidences(aCoincident,
 441                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 442                                          aCoinsideLines);
 443     SketchPlugin_Tools::findCoincidences(aCoincident,
 444                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 445                                          aCoinsideLines);
 446
 447     // Remove auxilary lines
 448     if(aCoinsideLines.size() > 2) {
 449       std::set<FeaturePtr> aNewLines;
 450       for(std::set<FeaturePtr>::iterator anIt = aCoinsideLines.begin(); anIt != aCoinsideLines.end(); ++anIt) {
 451         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 452           aNewLines.insert(*anIt);
 453         }
 454       }
 455       aCoinsideLines = aNewLines;
 456     }
 457
 458
 459     if(aCoinsideLines.size() != 2) {
 460       setError("At selected vertex should be two coincident lines");
 461       return;
 462     }
 463
 464     FeaturePtr anOldFeatureA, anOldFeatureB;
 465     std::set<FeaturePtr>::iterator aLinesIt = aCoinsideLines.begin();
 466     anOldFeatureA = *aLinesIt++;
 467     anOldFeatureB = *aLinesIt;
 468     aRefListOfBaseLines->append(anOldFeatureA);
 469     aRefListOfBaseLines->append(anOldFeatureB);
 470
 471
 472     // Set default value equal to 1/3 of the smallest line sharing the point.
 473     static const int aNbFeatures = 2;
 474     FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 475     double aLength = 0;
 476
 477     double aLengths[aNbFeatures];
 478     for (int i = 0; i < aNbFeatures; i++) {
 479       std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 480         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::START_ID() : SketchPlugin_Arc::START_ID()))->pnt();
 481       std::shared_ptr<GeomAPI_Pnt2d> anEndPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 482         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::END_ID() : SketchPlugin_Arc::END_ID()))->pnt();
 483       if(aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 484         aLengths[i] = aStartPnt->distance(anEndPnt);
 485       } else {
 486         std::shared_ptr<GeomAPI_Pnt2d> anArcCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 487           SketchPlugin_Arc::CENTER_ID()))->pnt();
 488         std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStartPnt->xy()->decreased(anArcCenter->xy())));
 489         std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEndPnt->xy()->decreased(anArcCenter->xy())));
 490         double aRadius = aStartPnt->distance(anArcCenter);
 491         double anAngle = aStartDir->angle(anEndDir);
 492         aLengths[i] = aRadius * abs(anAngle);
 493       }
 494     }
 495     aLength = aLengths[0];
 496     for(int i = 1; i < aNbFeatures; i++) {
 497       if(aLengths[i] < aLength) aLength = aLengths[i];
 498     }
 499     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aLength / 3.0);
 500   }
 501 }
 502
 503 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 504 {
 505   if (!sketch())
 506     return thePrevious;
 507
 508   AISObjectPtr anAIS = thePrevious;
 509   /// TODO: Equal constraint presentation should be put here
 510   return anAIS;
 511 }
 512
 513 bool SketchPlugin_ConstraintFillet::isMacro() const
 514 {
 515   return true;
 516 }
 517
 518
 519 // =========   Auxiliary functions   =================
 520 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 521                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 522 {
 523   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 524       theNewArc->attribute(theNewArcAttribute))->pnt();
 525   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 526       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 527 }
 528
 529 /// \brief Find intersections of lines shifted along normal direction
 530 void possibleFilletCenterLineLine(
 531     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 532     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 533     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 534 {
 535   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 536   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 537   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 538   double aDet = theDirA->cross(theDirB);
 539   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 540     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 541     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 542       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 543       double aVX = aDirAT->xy()->dot(aPntA);
 544       double aVY = aDirBT->xy()->dot(aPntB);
 545       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 546           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 547           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 548       theCenters.push_back(aPoint);
 549     }
 550   }
 551 }
 552
 553 /// \brief Find intersections of line shifted along normal direction in both sides
 554 ///        and a circle with extended radius
 555 void possibleFilletCenterLineArc(
 556     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 557     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 558     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 559 {
 560   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 561   std::shared_ptr<GeomAPI_XY> aPnt;
 562   double aDirNorm2 = theDirLine->dot(theDirLine);
 563   double aRad = 0.0;
 564   double aDirX = theDirLine->x();
 565   double aDirX2 = theDirLine->x() * theDirLine->x();
 566   double aDirY2 = theDirLine->y() * theDirLine->y();
 567   double aDirXY = theDirLine->x() * theDirLine->y();
 568   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 569     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 570     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 571     double aCoeff2 = aCoeff * aCoeff;
 572     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 573       aRad = theRadiusArc + aStepB * theRadius;
 574       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 575       if (aD < 0.0)
 576         continue;
 577       double aDs = sqrt(aD);
 578       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 579       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 580       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 581           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 582       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 583           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 584
 585       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 586       theCenters.push_back(aPoint1);
 587       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 588       theCenters.push_back(aPoint2);
 589     }
 590   }
 591 }
 592
 593 /// \brief Find intersections of two circles with extended radii
 594 void possibleFilletCenterArcArc(
 595     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 596     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 597     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 598 {
 599   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 600   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 601   double aCenterDist = sqrt(aCenterDist2);
 602
 603   double aRadA, aRadB;
 604   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 605     aRadA = theRadiusA + aStepA * theRadius;
 606     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 607       aRadB = theRadiusB + aStepB * theRadius;
 608       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 609         continue; // there is no intersections
 610
 611       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 612       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 613
 614       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 615       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 616
 617       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 618       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 619
 620       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 621       theCenters.push_back(aPoint1);
 622       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 623       theCenters.push_back(aPoint2);
 624     }
 625   }
 626 }
 627
 628 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 629                            double theRadius, bool theNotInversed[2],
 630                            std::shared_ptr<GeomAPI_XY>& theCenter,
 631                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 632                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 633 {
 634   static const int aNbFeatures = 2;
 635   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 636   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 637   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 638
 639   for (int i = 0; i < aNbFeatures; i++) {
 640     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 641       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 642           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 643       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 644           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 645     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 646       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 647           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 648       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 649           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 650       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 651           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 652     } else
 653       return;
 654     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 655         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 656         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 657     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 658         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 659         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 660   }
 661
 662   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 663       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 664     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 665     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 666     for (int i = 0; i < aNbFeatures; i++) {
 667       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 668       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 669     }
 670
 671     // get and filter possible centers
 672     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 673     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 674     double aDot = 0.0;
 675     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 676     for (; anIt != aSuspectCenters.end(); anIt++) {
 677       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 678       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 679       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 680         continue; // incorrect position
 681       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 682       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 683       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 684         continue; // incorrect position
 685       // the center is found, stop searching
 686       theCenter = *anIt;
 687       return;
 688     }
 689   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 690       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 691       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 692       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 693     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 694     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 695     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 696         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 697     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 698         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 699
 700     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 701         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 702     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 703         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 704     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 705
 706     // get and filter possible centers
 707     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 708     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 709     double aDot = 0.0;
 710     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 711     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 712     for (; anIt != aSuspectCenters.end(); anIt++) {
 713       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 714       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 715       if (aLineTgPoint->decreased(aStart[aLineInd])->dot(aDirLine->xy()) < 0.0)
 716         continue; // incorrect position
 717       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 718           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 719       double aCurAngle = aCurDir->angle(aStartArcDir);
 720       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 721       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 722         continue; // incorrect position
 723       // the center is found, stop searching
 724       theCenter = *anIt;
 725       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 726       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 727         theTangentA = aLineTgPoint;
 728         theTangentB = anArcTgPoint;
 729       } else {
 730         theTangentA = anArcTgPoint;
 731         theTangentB = aLineTgPoint;
 732       }
 733       return;
 734     }
 735   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 736       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 737     double anArcRadius[aNbFeatures];
 738     double anArcAngle[aNbFeatures];
 739     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 740     for (int i = 0; i < aNbFeatures; i++) {
 741       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 742       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 743           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 744       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 745           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 746       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 747     }
 748
 749     // get and filter possible centers
 750     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 751     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 752     double aDot = 0.0;
 753     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 754     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 755     for (; anIt != aSuspectCenters.end(); anIt++) {
 756       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 757           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 758       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 759       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 760       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 761         continue; // incorrect position
 762       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 763
 764       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 765       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 766       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 767       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 768         continue; // incorrect position
 769       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 770
 771       // the center is found, stop searching
 772       theCenter = *anIt;
 773       return;
 774     }
 775   }
 776 }