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   static const double aTol = 1.e-7;
  74
  75   // the viewer update should be blocked in order to avoid the temporaty fillet sub-features visualization
  76   // before they are processed by the solver
  77   //std::shared_ptr<Events_Message> aMsg = std::shared_ptr<Events_Message>(
  78   //    new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_BLOCKED)));
  79   //Events_Loop::loop()->send(aMsg);
  80
  81   std::shared_ptr<ModelAPI_Data> aData = data();
  82   ResultConstructionPtr aRC;
  83   // Check the base objects are initialized
  84   double aFilletRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
  85       aData->attribute(SketchPlugin_Constraint::VALUE()))->value();
  86   AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
  87       aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
  88   if (!aBaseA->isInitialized() || aBaseA->isObject()) {
  89     setError("Bad vertex selected");
  90     return;
  91   }
  92
  93   // Obtain fillet point
  94   std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aBaseA->attr());
  95   if (!aBasePoint) {
  96     setError("Bad vertex selected");
  97     return;
  98   }
  99   std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 100
 101   // Check the fillet shapes is not initialized yet
 102   AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 103       aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
 104   bool needNewObjects = aRefListOfFillet->size() == 0;
 105
 106   AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 107       aData->attribute(SketchPlugin_Constraint::ENTITY_C()));
 108
 109   // Obtain base features
 110   FeaturePtr anOldFeatureA, anOldFeatureB;
 111   std::list<ObjectPtr> anOldFeatList = aRefListOfBaseLines->list();
 112   std::list<ObjectPtr>::iterator aFeatIt = anOldFeatList.begin();
 113   anOldFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 114   anOldFeatureB = ModelAPI_Feature::feature(*aFeatIt);
 115
 116   if(!anOldFeatureA.get() || !anOldFeatureB.get()) {
 117     setError("One of the edges is empty");
 118     return;
 119   }
 120
 121   FeaturePtr aNewFeatureA, aNewFeatureB, aNewArc;
 122   if (needNewObjects) {
 123     // Create list of objects composing a fillet
 124     // copy aFeatureA
 125     aNewFeatureA = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureA, sketch());
 126     // copy aFeatureB
 127     aNewFeatureB = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureB, sketch());
 128     // create filleting arc (it will be attached to the list later)
 129     aNewArc = sketch()->addFeature(SketchPlugin_Arc::ID());
 130   } else {
 131     // Obtain features from the list
 132     std::list<ObjectPtr> aNewFeatList = aRefListOfFillet->list();
 133     std::list<ObjectPtr>::iterator aFeatIt = aNewFeatList.begin();
 134     aNewFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 135     aNewFeatureB = ModelAPI_Feature::feature(*aFeatIt++);
 136     aNewArc = ModelAPI_Feature::feature(*aFeatIt);
 137   }
 138
 139   // Calculate arc attributes
 140   static const int aNbFeatures = 2;
 141   FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 142   FeaturePtr aNewFeature[aNbFeatures] = {aNewFeatureA, aNewFeatureB};
 143   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures]; // tangent directions of the features in coincident point
 144   bool isStart[aNbFeatures]; // indicates which point the features share
 145   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2]; // first pair of points relate to first feature, second pair -  to second
 146   std::string aFeatAttributes[aNbFeatures * 2]; // attributes of features
 147   for (int i = 0; i < aNbFeatures; i++) {
 148     std::string aStartAttr, aEndAttr;
 149     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 150       aStartAttr = SketchPlugin_Line::START_ID();
 151       aEndAttr = SketchPlugin_Line::END_ID();
 152     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 153       aStartAttr = SketchPlugin_Arc::START_ID();
 154       aEndAttr = SketchPlugin_Arc::END_ID();
 155     } else { // wrong argument
 156       aRefListOfFillet->remove(aNewFeatureA);
 157       aRefListOfFillet->remove(aNewFeatureB);
 158       aRefListOfFillet->remove(aNewArc);
 159       aRefListOfBaseLines->clear();
 160       return;
 161     }
 162     aFeatAttributes[2*i] = aStartAttr;
 163     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 164         aFeature[i]->attribute(aStartAttr))->pnt();
 165     aFeatAttributes[2*i+1] = aEndAttr;
 166     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 167         aFeature[i]->attribute(aEndAttr))->pnt();
 168   }
 169   for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
 170     for (int j = 0; j < 2; j++) // loop on start-end of each feature
 171       if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPoint) < 1.e-10) {
 172         isStart[aFeatInd] = (j==0);
 173         break;
 174       }
 175   }
 176   // tangent directions of the features
 177   for (int i = 0; i < aNbFeatures; i++) {
 178     std::shared_ptr<GeomAPI_XY> aDir;
 179     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 180       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 181       if (!isStart[i])
 182         aDir = aDir->multiplied(-1.0);
 183     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 184       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 185           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 186           aNewFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 187       aDir = isStart[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 188       aDir = aDir->decreased(aCenterPoint->xy());
 189
 190       double x = aDir->x();
 191       double y = aDir->y();
 192       aDir->setX(-y);
 193       aDir->setY(x);
 194       if (!isStart[i])
 195         aDir = aDir->multiplied(-1.0);
 196     }
 197     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 198   }
 199
 200   // Wait all constraints being created, then send update events
 201   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 202   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 203   if (isUpdateFlushed)
 204     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 205
 206   // By default, the start point of fillet arc is connected to FeatureA,
 207   // and the end point - to FeatureB. But when the angle between TangentDirA and
 208   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 209   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A), where A and B - angles between corresponding tanget direction and the X axis
 210   bool isReversed = cosBA > 0.0;
 211
 212   // Calculate fillet arc parameters
 213   std::shared_ptr<GeomAPI_XY> aCenter, aTangentPntA, aTangentPntB;
 214   calculateFilletCenter(anOldFeatureA, anOldFeatureB, aFilletRadius, isStart, aCenter, aTangentPntA, aTangentPntB);
 215   // update features
 216   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 217       aNewFeatureA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(
 218       aTangentPntA->x(), aTangentPntA->y());
 219   aNewFeatureA->execute();
 220   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 221       aNewFeatureB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(
 222       aTangentPntB->x(), aTangentPntB->y());
 223   aNewFeatureB->execute();
 224   // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
 225   // by arc; moreover, it may cause cyclicity in hte mechanism of updater
 226   aNewArc->data()->blockSendAttributeUpdated(true);
 227   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 228       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 229       aCenter->x(), aCenter->y());
 230   if (isReversed) {
 231     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 232     aTangentPntA = aTangentPntB;
 233     aTangentPntB = aTmp;
 234   }
 235   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 236       aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 237   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 238       aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 239   if (aStartPoint->isInitialized() && aEndPoint->isInitialized() &&
 240      (aStartPoint->pnt()->xy()->distance(aTangentPntA) > aTol ||
 241       aEndPoint->pnt()->xy()->distance(aTangentPntB) > aTol))
 242     std::dynamic_pointer_cast<SketchPlugin_Arc>(aNewArc)->setReversed(false);
 243   aStartPoint->setValue(aTangentPntA->x(), aTangentPntA->y());
 244   aEndPoint->setValue(aTangentPntB->x(), aTangentPntB->y());
 245   aNewArc->data()->blockSendAttributeUpdated(false);
 246   aNewArc->execute();
 247
 248   if (needNewObjects) {
 249     // attach new arc to the list
 250     aRefListOfFillet->append(aNewFeatureA->lastResult());
 251     aRefListOfFillet->append(aNewFeatureB->lastResult());
 252     aRefListOfFillet->append(aNewArc->lastResult());
 253
 254     myProducedFeatures.push_back(aNewFeatureA);
 255     myProducedFeatures.push_back(aNewFeatureB);
 256     myProducedFeatures.push_back(aNewArc);
 257
 258     // Create list of additional constraints:
 259     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 260     // 1.1. coincidence
 261     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 262     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 263         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 264     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 265     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 266         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 267     int aFeatInd = isReversed ? 1 : 0;
 268     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 269     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 270     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 271     aConstraint->execute();
 272     myProducedFeatures.push_back(aConstraint);
 273     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 274     // 1.2. coincidence
 275     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 276     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 277         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 278     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 279     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 280         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 281     aFeatInd = isReversed ? 0 : 1;
 282     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 283     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 284     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 285     aConstraint->execute();
 286     myProducedFeatures.push_back(aConstraint);
 287     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 288     // 2. Fillet arc radius
 289     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 290     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 291     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 292     //aRefAttr->setObject(aNewArc->lastResult());
 293     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 294     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 295     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 296     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 297     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 298     //aConstraint->execute();
 299     //myProducedFeatures.push_back(aConstraint);
 300     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 301     // 3. Tangency of fillet arc and features
 302     for (int i = 0; i < aNbFeatures; i++) {
 303       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 304       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 305           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 306       aRefAttr->setObject(aNewArc->lastResult());
 307       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 308           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 309       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 310       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 311       aConstraint->execute();
 312       myProducedFeatures.push_back(aConstraint);
 313       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 314     }
 315     // 4. Coincidence of free boundaries of base and copied features
 316     for (int i = 0; i < aNbFeatures; i++) {
 317       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 318       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 319       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 320           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 321       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 322       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 323           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 324       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 325       myProducedFeatures.push_back(aConstraint);
 326     }
 327     // 5. Tangent points should be placed on the base features
 328     for (int i = 0; i < aNbFeatures; i++) {
 329       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 330       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 331       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 332           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 333       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 334       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 335           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 336       aRefAttr->setObject(aFeature[i]->lastResult());
 337       myProducedFeatures.push_back(aConstraint);
 338     }
 339     // make base features auxiliary
 340     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 341     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 342     myBaseObjects.clear();
 343     myBaseObjects.push_back(anOldFeatureA);
 344     myBaseObjects.push_back(anOldFeatureB);
 345     // exchange the naming IDs of newly created and old line that become auxiliary
 346     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 347     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 348   } else {
 349     // Update radius value
 350     int aNbSubs = sketch()->numberOfSubs();
 351     FeaturePtr aSubFeature;
 352     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 353       aSubFeature = sketch()->subFeature(aSub);
 354       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 355         continue;
 356       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 357           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 358       if (!aRefAttr || !aRefAttr->isObject())
 359         continue;
 360       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 361       if (aFeature == aNewArc) {
 362         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 363           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 364         aRadius->setValue(aFilletRadius);
 365         break;
 366       }
 367     }
 368   }
 369
 370   // send events to update the sub-features by the solver
 371   if (isUpdateFlushed)
 372     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 373
 374   // the viewer update should be unblocked in order after the fillet features
 375   // are processed by the solver
 376   //aMsg = std::shared_ptr<Events_Message>(
 377   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 378   //Events_Loop::loop()->send(aMsg);
 379 }
 380
 381 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 382 {
 383   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 384     // clear the list of fillet entities
 385     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 386         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 387     aRefListOfFillet->clear();
 388
 389     // clear the list of base features
 390     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 391         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 392       aRefListOfBaseLines->clear();
 393
 394     // remove all produced objects and constraints
 395     DocumentPtr aDoc = sketch()->document();
 396     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 397     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 398       aDoc->removeFeature(*aCIt);
 399     myProducedFeatures.clear();
 400
 401     // clear auxiliary flag on initial objects
 402     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 403       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 404     myBaseObjects.clear();
 405
 406     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 407         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 408     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 409       return;
 410     }
 411
 412     AttributePtr anAttrBase = aBaseA->attr();
 413     const std::set<AttributePtr>& aRefsList = anAttrBase->owner()->data()->refsToMe();
 414     std::set<AttributePtr>::const_iterator aIt;
 415     FeaturePtr aCoincident;
 416     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 417       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 418       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 419       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 420         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 421           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 422         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 423           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 424         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 425           AttributePtr anAttrA = anAttrRefA->attr();
 426           if(anAttrBase == anAttrA) {
 427             aCoincident = aConstrFeature;
 428             break;
 429           }
 430         }
 431         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 432           AttributePtr anAttrB = anAttrRefB->attr();
 433           if(anAttrBase == anAttrB) {
 434             aCoincident = aConstrFeature;
 435             break;
 436           }
 437         }
 438       }
 439     }
 440
 441     if(!aCoincident.get()) {
 442       setError("No coincident edges at selected vertex");
 443       return;
 444     }
 445
 446     std::set<FeaturePtr> aCoinsideLines;
 447     SketchPlugin_Tools::findCoincidences(aCoincident,
 448                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 449                                          aCoinsideLines);
 450     SketchPlugin_Tools::findCoincidences(aCoincident,
 451                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 452                                          aCoinsideLines);
 453
 454     // Remove auxilary lines
 455     if(aCoinsideLines.size() > 2) {
 456       std::set<FeaturePtr> aNewLines;
 457       for(std::set<FeaturePtr>::iterator anIt = aCoinsideLines.begin(); anIt != aCoinsideLines.end(); ++anIt) {
 458         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 459           aNewLines.insert(*anIt);
 460         }
 461       }
 462       aCoinsideLines = aNewLines;
 463     }
 464
 465
 466     if(aCoinsideLines.size() != 2) {
 467       setError("At selected vertex should be two coincident lines");
 468       return;
 469     }
 470
 471     FeaturePtr anOldFeatureA, anOldFeatureB;
 472     std::set<FeaturePtr>::iterator aLinesIt = aCoinsideLines.begin();
 473     anOldFeatureA = *aLinesIt++;
 474     anOldFeatureB = *aLinesIt;
 475     aRefListOfBaseLines->append(anOldFeatureA);
 476     aRefListOfBaseLines->append(anOldFeatureB);
 477
 478
 479     // Set default value equal to 1/3 of the smallest line sharing the point.
 480     static const int aNbFeatures = 2;
 481     FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 482     double aLength = 0;
 483
 484     double aLengths[aNbFeatures];
 485     for (int i = 0; i < aNbFeatures; i++) {
 486       std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 487         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::START_ID() : SketchPlugin_Arc::START_ID()))->pnt();
 488       std::shared_ptr<GeomAPI_Pnt2d> anEndPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 489         aFeature[i]->getKind() == SketchPlugin_Line::ID() ? SketchPlugin_Line::END_ID() : SketchPlugin_Arc::END_ID()))->pnt();
 490       if(aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 491         aLengths[i] = aStartPnt->distance(anEndPnt);
 492       } else {
 493         std::shared_ptr<GeomAPI_Pnt2d> anArcCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFeature[i]->attribute(
 494           SketchPlugin_Arc::CENTER_ID()))->pnt();
 495         std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStartPnt->xy()->decreased(anArcCenter->xy())));
 496         std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEndPnt->xy()->decreased(anArcCenter->xy())));
 497         double aRadius = aStartPnt->distance(anArcCenter);
 498         double anAngle = aStartDir->angle(anEndDir);
 499         aLengths[i] = aRadius * abs(anAngle);
 500       }
 501     }
 502     aLength = aLengths[0];
 503     for(int i = 1; i < aNbFeatures; i++) {
 504       if(aLengths[i] < aLength) aLength = aLengths[i];
 505     }
 506     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aLength / 3.0);
 507   }
 508 }
 509
 510 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 511 {
 512   if (!sketch())
 513     return thePrevious;
 514
 515   AISObjectPtr anAIS = thePrevious;
 516   /// TODO: Equal constraint presentation should be put here
 517   return anAIS;
 518 }
 519
 520 bool SketchPlugin_ConstraintFillet::isMacro() const
 521 {
 522   return true;
 523 }
 524
 525
 526 // =========   Auxiliary functions   =================
 527 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 528                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 529 {
 530   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 531       theNewArc->attribute(theNewArcAttribute))->pnt();
 532   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 533       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 534 }
 535
 536 /// \brief Find intersections of lines shifted along normal direction
 537 void possibleFilletCenterLineLine(
 538     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 539     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 540     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 541 {
 542   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 543   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 544   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 545   double aDet = theDirA->cross(theDirB);
 546   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 547     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 548     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 549       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 550       double aVX = aDirAT->xy()->dot(aPntA);
 551       double aVY = aDirBT->xy()->dot(aPntB);
 552       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 553           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 554           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 555       theCenters.push_back(aPoint);
 556     }
 557   }
 558 }
 559
 560 /// \brief Find intersections of line shifted along normal direction in both sides
 561 ///        and a circle with extended radius
 562 void possibleFilletCenterLineArc(
 563     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 564     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 565     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 566 {
 567   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 568   std::shared_ptr<GeomAPI_XY> aPnt;
 569   double aDirNorm2 = theDirLine->dot(theDirLine);
 570   double aRad = 0.0;
 571   double aDirX = theDirLine->x();
 572   double aDirX2 = theDirLine->x() * theDirLine->x();
 573   double aDirY2 = theDirLine->y() * theDirLine->y();
 574   double aDirXY = theDirLine->x() * theDirLine->y();
 575   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 576     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 577     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 578     double aCoeff2 = aCoeff * aCoeff;
 579     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 580       aRad = theRadiusArc + aStepB * theRadius;
 581       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 582       if (aD < 0.0)
 583         continue;
 584       double aDs = sqrt(aD);
 585       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 586       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 587       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 588           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 589       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 590           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 591
 592       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 593       theCenters.push_back(aPoint1);
 594       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 595       theCenters.push_back(aPoint2);
 596     }
 597   }
 598 }
 599
 600 /// \brief Find intersections of two circles with extended radii
 601 void possibleFilletCenterArcArc(
 602     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 603     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 604     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 605 {
 606   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 607   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 608   double aCenterDist = sqrt(aCenterDist2);
 609
 610   double aRadA, aRadB;
 611   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 612     aRadA = theRadiusA + aStepA * theRadius;
 613     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 614       aRadB = theRadiusB + aStepB * theRadius;
 615       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 616         continue; // there is no intersections
 617
 618       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 619       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 620
 621       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 622       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 623
 624       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 625       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 626
 627       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 628       theCenters.push_back(aPoint1);
 629       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 630       theCenters.push_back(aPoint2);
 631     }
 632   }
 633 }
 634
 635 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 636                            double theRadius, bool theNotInversed[2],
 637                            std::shared_ptr<GeomAPI_XY>& theCenter,
 638                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 639                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 640 {
 641   static const int aNbFeatures = 2;
 642   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 643   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 644   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 645
 646   for (int i = 0; i < aNbFeatures; i++) {
 647     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 648       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 649           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 650       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 651           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 652     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 653       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 654           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 655       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 656           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 657       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 658           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 659     } else
 660       return;
 661     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 662         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 663         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 664     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 665         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 666         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 667   }
 668
 669   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 670       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 671     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 672     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 673     for (int i = 0; i < aNbFeatures; i++) {
 674       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 675       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 676     }
 677
 678     // get and filter possible centers
 679     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 680     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 681     double aDot = 0.0;
 682     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 683     for (; anIt != aSuspectCenters.end(); anIt++) {
 684       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 685       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 686       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 687         continue; // incorrect position
 688       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 689       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 690       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 691         continue; // incorrect position
 692       // the center is found, stop searching
 693       theCenter = *anIt;
 694       return;
 695     }
 696   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 697       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 698       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 699       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 700     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 701     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 702     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 703         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 704     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 705         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 706
 707     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 708         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 709     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 710         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 711     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 712
 713     // get possible centers and filter them
 714     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 715     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 716     double aDot = 0.0;
 717     // the line is forward into the arc
 718     double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
 719     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 720     // The possible centers are ranged by their positions.
 721     // If the point is not satisfy one of criteria, the weight is decreased with penalty.
 722     int aBestWeight = 0;
 723     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 724     for (; anIt != aSuspectCenters.end(); anIt++) {
 725       int aWeight = 2;
 726       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 727       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 728       // Check the point is placed on the correct arc (penalty if false)
 729       if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
 730         aWeight -= 1;
 731       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 732           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 733       double aCurAngle = aCurDir->angle(aStartArcDir);
 734       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 735       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 736         continue;
 737       if (aWeight > aBestWeight)
 738         aBestWeight = aWeight;
 739       else if (aWeight < aBestWeight ||
 740                aStart[aLineInd]->distance(*anIt) >
 741                aStart[aLineInd]->distance(theCenter)) // <-- take closer point
 742         continue;
 743       // the center is found, stop searching
 744       theCenter = *anIt;
 745       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 746       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 747         theTangentA = aLineTgPoint;
 748         theTangentB = anArcTgPoint;
 749       } else {
 750         theTangentA = anArcTgPoint;
 751         theTangentB = aLineTgPoint;
 752       }
 753       //return;
 754     }
 755   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 756       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 757     double anArcRadius[aNbFeatures];
 758     double anArcAngle[aNbFeatures];
 759     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 760     for (int i = 0; i < aNbFeatures; i++) {
 761       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 762       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 763           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 764       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 765           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 766       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 767     }
 768
 769     // get and filter possible centers
 770     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 771     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 772     double aDot = 0.0;
 773     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 774     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 775     for (; anIt != aSuspectCenters.end(); anIt++) {
 776       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 777           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 778       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 779       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 780       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 781         continue; // incorrect position
 782       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 783
 784       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 785       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 786       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 787       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 788         continue; // incorrect position
 789       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 790
 791       // the center is found, stop searching
 792       theCenter = *anIt;
 793       return;
 794     }
 795   }
 796 }