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
 220   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 221       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 222       aCenter->x(), aCenter->y());
 223   if (isReversed) {
 224     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 225     aTangentPntA = aTangentPntB;
 226     aTangentPntB = aTmp;
 227   }
 228   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 229       aNewArc->attribute(SketchPlugin_Arc::START_ID()))->setValue(aTangentPntA->x(), aTangentPntA->y());
 230   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 231       aNewArc->attribute(SketchPlugin_Arc::END_ID()))->setValue(aTangentPntB->x(), aTangentPntB->y());
 232   aNewArc->execute();
 233
 234   if (needNewObjects) {
 235     // attach new arc to the list
 236     aRefListOfFillet->append(aNewFeatureA->lastResult());
 237     aRefListOfFillet->append(aNewFeatureB->lastResult());
 238     aRefListOfFillet->append(aNewArc->lastResult());
 239
 240     // attach base lines to the list
 241     aRefListOfBaseLines->append(anOldFeatureA);
 242     aRefListOfBaseLines->append(anOldFeatureB);
 243
 244     myProducedFeatures.push_back(aNewFeatureA);
 245     myProducedFeatures.push_back(aNewFeatureB);
 246     myProducedFeatures.push_back(aNewArc);
 247
 248     // Create list of additional constraints:
 249     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 250     // 1.1. coincidence
 251     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 252     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 253         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 254     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 255     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 256         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 257     int aFeatInd = isReversed ? 1 : 0;
 258     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 259     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 260     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 261     aConstraint->execute();
 262     myProducedFeatures.push_back(aConstraint);
 263     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 264     // 1.2. coincidence
 265     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 266     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 267         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 268     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 269     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 270         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 271     aFeatInd = isReversed ? 0 : 1;
 272     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 273     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 274     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 275     aConstraint->execute();
 276     myProducedFeatures.push_back(aConstraint);
 277     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 278     // 2. Fillet arc radius
 279     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 280     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 281     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 282     //aRefAttr->setObject(aNewArc->lastResult());
 283     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 284     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 285     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 286     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 287     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 288     //aConstraint->execute();
 289     //myProducedFeatures.push_back(aConstraint);
 290     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 291     // 3. Tangency of fillet arc and features
 292     for (int i = 0; i < aNbFeatures; i++) {
 293       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 294       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 295           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 296       aRefAttr->setObject(aNewArc->lastResult());
 297       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 298           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 299       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 300       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 301       aConstraint->execute();
 302       myProducedFeatures.push_back(aConstraint);
 303       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 304     }
 305     // 4. Coincidence of free boundaries of base and copied features
 306     for (int i = 0; i < aNbFeatures; i++) {
 307       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 308       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 309       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 310           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 311       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 312       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 313           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 314       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 315       myProducedFeatures.push_back(aConstraint);
 316     }
 317     // 5. Tangent points should be placed on the base features
 318     for (int i = 0; i < aNbFeatures; i++) {
 319       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 320       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 321       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 322           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 323       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 324       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 325           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 326       aRefAttr->setObject(aFeature[i]->lastResult());
 327       myProducedFeatures.push_back(aConstraint);
 328     }
 329     // make base features auxiliary
 330     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 331     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 332     myBaseObjects.clear();
 333     myBaseObjects.push_back(anOldFeatureA);
 334     myBaseObjects.push_back(anOldFeatureB);
 335     // exchange the naming IDs of newly created and old line that become auxiliary
 336     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 337     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 338   } else {
 339     // Update radius value
 340     int aNbSubs = sketch()->numberOfSubs();
 341     FeaturePtr aSubFeature;
 342     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 343       aSubFeature = sketch()->subFeature(aSub);
 344       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 345         continue;
 346       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 347           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 348       if (!aRefAttr || !aRefAttr->isObject())
 349         continue;
 350       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 351       if (aFeature == aNewArc) {
 352         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 353           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 354         aRadius->setValue(aFilletRadius);
 355         break;
 356       }
 357     }
 358   }
 359
 360   // send events to update the sub-features by the solver
 361   if (isUpdateFlushed)
 362     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 363
 364   // the viewer update should be unblocked in order after the fillet features
 365   // are processed by the solver
 366   //aMsg = std::shared_ptr<Events_Message>(
 367   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 368   //Events_Loop::loop()->send(aMsg);
 369 }
 370
 371 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 372 {
 373   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 374     // clear the list of fillet entities
 375     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 376         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 377     aRefListOfFillet->clear();
 378
 379     // clear the list of base features
 380     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 381         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 382       aRefListOfBaseLines->clear();
 383
 384     // remove all produced objects and constraints
 385     DocumentPtr aDoc = sketch()->document();
 386     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 387     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 388       aDoc->removeFeature(*aCIt);
 389     myProducedFeatures.clear();
 390
 391     // clear auxiliary flag on initial objects
 392     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 393       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 394     myBaseObjects.clear();
 395
 396     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 397         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 398     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 399       return;
 400     }
 401
 402     AttributePtr anAttrBase = aBaseA->attr();
 403     const std::set<AttributePtr>& aRefsList = anAttrBase->owner()->data()->refsToMe();
 404     std::set<AttributePtr>::const_iterator aIt;
 405     FeaturePtr aCoincident;
 406     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 407       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 408       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 409       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 410         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 411           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 412         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 413           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 414         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 415           AttributePtr anAttrA = anAttrRefA->attr();
 416           if(anAttrBase == anAttrA) {
 417             aCoincident = aConstrFeature;
 418             break;
 419           }
 420         }
 421         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 422           AttributePtr anAttrB = anAttrRefB->attr();
 423           if(anAttrBase == anAttrB) {
 424             aCoincident = aConstrFeature;
 425             break;
 426           }
 427         }
 428       }
 429     }
 430
 431     if(!aCoincident.get()) {
 432       setError("No coincident edges at selected vertex");
 433       return;
 434     }
 435
 436     std::set<FeaturePtr> aCoinsideLines;
 437     SketchPlugin_Tools::findCoincidences(aCoincident,
 438                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 439                                          aCoinsideLines);
 440     SketchPlugin_Tools::findCoincidences(aCoincident,
 441                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 442                                          aCoinsideLines);
 443
 444     // Remove auxilary lines
 445     if(aCoinsideLines.size() > 2) {
 446       std::set<FeaturePtr> aNewLines;
 447       for(std::set<FeaturePtr>::iterator anIt = aCoinsideLines.begin(); anIt != aCoinsideLines.end(); ++anIt) {
 448         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 449           aNewLines.insert(*anIt);
 450         }
 451       }
 452       aCoinsideLines = aNewLines;
 453     }
 454
 455
 456     if(aCoinsideLines.size() != 2) {
 457       setError("At selected vertex should be two coincident lines");
 458       return;
 459     }
 460
 461     FeaturePtr anOldFeatureA, anOldFeatureB;
 462     std::set<FeaturePtr>::iterator aLinesIt = aCoinsideLines.begin();
 463     anOldFeatureA = *aLinesIt++;
 464     anOldFeatureB = *aLinesIt;
 465     aRefListOfBaseLines->append(anOldFeatureA);
 466     aRefListOfBaseLines->append(anOldFeatureB);
 467
 468
 469     // Set default value equal to 1/3 of the smallest line sharing the point.
 470     static const int aNbFeatures = 2;
 471     FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 472     double aLength = 0;
 473
 474     double aLengths[aNbFeatures];
 475     for (int i = 0; i < aNbFeatures; i++) {
 476       std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 477         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::START_ID() : SketchPlugin_Arc::START_ID()))->pnt();
 478       std::shared_ptr<GeomAPI_Pnt2d> anEndPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 479         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::END_ID() : SketchPlugin_Arc::END_ID()))->pnt();
 480       if(aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 481         aLengths[i] = aStartPnt->distance(anEndPnt);
 482       } else {
 483         std::shared_ptr<GeomAPI_Pnt2d> anArcCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 484           SketchPlugin_Arc::CENTER_ID()))->pnt();
 485         std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStartPnt->xy()->decreased(anArcCenter->xy())));
 486         std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEndPnt->xy()->decreased(anArcCenter->xy())));
 487         double aRadius = aStartPnt->distance(anArcCenter);
 488         double anAngle = aStartDir->angle(anEndDir);
 489         aLengths[i] = aRadius * abs(anAngle);
 490       }
 491     }
 492     aLength = aLengths[0];
 493     for(int i = 1; i < aNbFeatures; i++) {
 494       if(aLengths[i] < aLength) aLength = aLengths[i];
 495     }
 496     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aLength / 3.0);
 497   }
 498 }
 499
 500 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 501 {
 502   if (!sketch())
 503     return thePrevious;
 504
 505   AISObjectPtr anAIS = thePrevious;
 506   /// TODO: Equal constraint presentation should be put here
 507   return anAIS;
 508 }
 509
 510 bool SketchPlugin_ConstraintFillet::isMacro() const
 511 {
 512   return true;
 513 }
 514
 515
 516 // =========   Auxiliary functions   =================
 517 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 518                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 519 {
 520   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 521       theNewArc->attribute(theNewArcAttribute))->pnt();
 522   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 523       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 524 }
 525
 526 /// \brief Find intersections of lines shifted along normal direction
 527 void possibleFilletCenterLineLine(
 528     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 529     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 530     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 531 {
 532   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 533   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 534   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 535   double aDet = theDirA->cross(theDirB);
 536   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 537     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 538     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 539       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 540       double aVX = aDirAT->xy()->dot(aPntA);
 541       double aVY = aDirBT->xy()->dot(aPntB);
 542       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 543           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 544           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 545       theCenters.push_back(aPoint);
 546     }
 547   }
 548 }
 549
 550 /// \brief Find intersections of line shifted along normal direction in both sides
 551 ///        and a circle with extended radius
 552 void possibleFilletCenterLineArc(
 553     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 554     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 555     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 556 {
 557   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 558   std::shared_ptr<GeomAPI_XY> aPnt;
 559   double aDirNorm2 = theDirLine->dot(theDirLine);
 560   double aRad = 0.0;
 561   double aDirX = theDirLine->x();
 562   double aDirX2 = theDirLine->x() * theDirLine->x();
 563   double aDirY2 = theDirLine->y() * theDirLine->y();
 564   double aDirXY = theDirLine->x() * theDirLine->y();
 565   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 566     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 567     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 568     double aCoeff2 = aCoeff * aCoeff;
 569     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 570       aRad = theRadiusArc + aStepB * theRadius;
 571       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 572       if (aD < 0.0)
 573         continue;
 574       double aDs = sqrt(aD);
 575       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 576       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 577       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 578           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 579       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 580           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 581
 582       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 583       theCenters.push_back(aPoint1);
 584       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 585       theCenters.push_back(aPoint2);
 586     }
 587   }
 588 }
 589
 590 /// \brief Find intersections of two circles with extended radii
 591 void possibleFilletCenterArcArc(
 592     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 593     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 594     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 595 {
 596   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 597   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 598   double aCenterDist = sqrt(aCenterDist2);
 599
 600   double aRadA, aRadB;
 601   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 602     aRadA = theRadiusA + aStepA * theRadius;
 603     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 604       aRadB = theRadiusB + aStepB * theRadius;
 605       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 606         continue; // there is no intersections
 607
 608       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 609       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 610
 611       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 612       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 613
 614       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 615       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 616
 617       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 618       theCenters.push_back(aPoint1);
 619       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 620       theCenters.push_back(aPoint2);
 621     }
 622   }
 623 }
 624
 625 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 626                            double theRadius, bool theNotInversed[2],
 627                            std::shared_ptr<GeomAPI_XY>& theCenter,
 628                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 629                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 630 {
 631   static const int aNbFeatures = 2;
 632   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 633   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 634   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 635
 636   for (int i = 0; i < aNbFeatures; i++) {
 637     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 638       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 639           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 640       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 641           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 642     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 643       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 644           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 645       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 646           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 647       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 648           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 649     } else
 650       return;
 651     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 652         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 653         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 654     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 655         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 656         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 657   }
 658
 659   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 660       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 661     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 662     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 663     for (int i = 0; i < aNbFeatures; i++) {
 664       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 665       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 666     }
 667
 668     // get and filter possible centers
 669     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 670     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 671     double aDot = 0.0;
 672     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 673     for (; anIt != aSuspectCenters.end(); anIt++) {
 674       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 675       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 676       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 677         continue; // incorrect position
 678       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 679       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 680       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 681         continue; // incorrect position
 682       // the center is found, stop searching
 683       theCenter = *anIt;
 684       return;
 685     }
 686   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 687       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 688       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 689       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 690     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 691     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 692     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 693         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 694     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 695         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 696
 697     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 698         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 699     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 700         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 701     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 702
 703     // get and filter possible centers
 704     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 705     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 706     double aDot = 0.0;
 707     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 708     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 709     for (; anIt != aSuspectCenters.end(); anIt++) {
 710       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 711       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 712       if (aLineTgPoint->decreased(aStart[aLineInd])->dot(aDirLine->xy()) < 0.0)
 713         continue; // incorrect position
 714       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 715           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 716       double aCurAngle = aCurDir->angle(aStartArcDir);
 717       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 718       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 719         continue; // incorrect position
 720       // the center is found, stop searching
 721       theCenter = *anIt;
 722       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 723       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 724         theTangentA = aLineTgPoint;
 725         theTangentB = anArcTgPoint;
 726       } else {
 727         theTangentA = anArcTgPoint;
 728         theTangentB = aLineTgPoint;
 729       }
 730       return;
 731     }
 732   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 733       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 734     double anArcRadius[aNbFeatures];
 735     double anArcAngle[aNbFeatures];
 736     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 737     for (int i = 0; i < aNbFeatures; i++) {
 738       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 739       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 740           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 741       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 742           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 743       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 744     }
 745
 746     // get and filter possible centers
 747     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 748     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 749     double aDot = 0.0;
 750     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 751     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 752     for (; anIt != aSuspectCenters.end(); anIt++) {
 753       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 754           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 755       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 756       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 757       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 758         continue; // incorrect position
 759       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 760
 761       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 762       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 763       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 764       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 765         continue; // incorrect position
 766       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 767
 768       // the center is found, stop searching
 769       theCenter = *anIt;
 770       return;
 771     }
 772   }
 773 }