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_Circ2d.h>
  10 #include <GeomAPI_Dir2d.h>
  11 #include <GeomAPI_Lin2d.h>
  12 #include <GeomAPI_Pnt2d.h>
  13 #include <GeomAPI_XY.h>
  14 #include <GeomDataAPI_Point2D.h>
  15 #include <ModelAPI_AttributeDouble.h>
  16 #include <ModelAPI_AttributeRefAttr.h>
  17 #include <ModelAPI_AttributeRefList.h>
  18 #include <ModelAPI_Data.h>
  19 #include <ModelAPI_Events.h>
  20 #include <ModelAPI_ResultConstruction.h>
  21 #include <ModelAPI_Session.h>
  22 #include <ModelAPI_Validator.h>
  23
  24 #include <SketchPlugin_Arc.h>
  25 #include <SketchPlugin_Line.h>
  26 #include <SketchPlugin_Sketch.h>
  27 #include <SketchPlugin_ConstraintCoincidence.h>
  28 #include <SketchPlugin_ConstraintTangent.h>
  29 #include <SketchPlugin_ConstraintRadius.h>
  30 #include <SketchPlugin_Tools.h>
  31
  32 #include <SketcherPrs_Factory.h>
  33 #include <SketcherPrs_Tools.h>
  34
  35 #include <Config_PropManager.h>
  36 #include <Events_Loop.h>
  37
  38 #define _USE_MATH_DEFINES
  39 #include <math.h>
  40
  41 static const std::string PREVIOUS_VALUE("FilletPreviousRadius");
  42
  43 const double tolerance = 1.e-7;
  44 const double paramTolerance = 1.e-4;
  45
  46 /// \brief Attract specified point on theNewArc to the attribute of theFeature
  47 static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
  48   FeaturePtr theFeature, const std::string& theFeatureAttribute);
  49
  50 /// \brief Calculates center of fillet arc and coordinates of tangency points
  51 static void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
  52                                   double theRadius, bool theNotInversed[2],
  53                                   std::shared_ptr<GeomAPI_XY>& theCenter,
  54                                   std::shared_ptr<GeomAPI_XY>& theTangentA,
  55                                   std::shared_ptr<GeomAPI_XY>& theTangentB);
  56
  57 /// Get point on 1/3 length of edge from fillet point
  58 static void getPointOnEdge(const FeaturePtr theFeature,
  59                            const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
  60                            std::shared_ptr<GeomAPI_Pnt2d>& thePoint);
  61
  62 /// Get distance from point to feature
  63 static double getProjectionDistance(const FeaturePtr theFeature,
  64                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint);
  65
  66 SketchPlugin_ConstraintFillet::SketchPlugin_ConstraintFillet()
  67 {
  68 }
  69
  70 void SketchPlugin_ConstraintFillet::initAttributes()
  71 {
  72   data()->addAttribute(SketchPlugin_Constraint::VALUE(), ModelAPI_AttributeDouble::typeId());
  73   data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefAttr::typeId());
  74   data()->addAttribute(SketchPlugin_Constraint::ENTITY_B(), ModelAPI_AttributeRefList::typeId());
  75   // This attribute used to store base edges
  76   data()->addAttribute(SketchPlugin_Constraint::ENTITY_C(), ModelAPI_AttributeRefList::typeId());
  77   data()->addAttribute(PREVIOUS_VALUE, ModelAPI_AttributeDouble::typeId());
  78   // initialize attribute not applicable for user
  79   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_B());
  80   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_C());
  81   data()->attribute(PREVIOUS_VALUE)->setInitialized();
  82   std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(PREVIOUS_VALUE))->setValue(0.0);
  83 }
  84
  85 void SketchPlugin_ConstraintFillet::execute()
  86 {
  87   static const double aTol = 1.e-7;
  88
  89   // the viewer update should be blocked in order to avoid the temporaty fillet sub-features visualization
  90   // before they are processed by the solver
  91   //std::shared_ptr<Events_Message> aMsg = std::shared_ptr<Events_Message>(
  92   //    new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_BLOCKED)));
  93   //Events_Loop::loop()->send(aMsg);
  94
  95   std::shared_ptr<ModelAPI_Data> aData = data();
  96   ResultConstructionPtr aRC;
  97   // Check the base objects are initialized
  98   double aFilletRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
  99       aData->attribute(SketchPlugin_Constraint::VALUE()))->value();
 100   AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 101       aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
 102   if (!aBaseA->isInitialized() || aBaseA->isObject()) {
 103     setError("Bad vertex selected");
 104     return;
 105   }
 106
 107   // Obtain fillet point
 108   std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aBaseA->attr());
 109   if (!aBasePoint) {
 110     setError("Bad vertex selected");
 111     return;
 112   }
 113   std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 114
 115   // Check the fillet shapes is not initialized yet
 116   AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 117       aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
 118   bool needNewObjects = aRefListOfFillet->size() == 0;
 119
 120   AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 121       aData->attribute(SketchPlugin_Constraint::ENTITY_C()));
 122
 123   // Obtain base features
 124   FeaturePtr anOldFeatureA, anOldFeatureB;
 125   std::list<ObjectPtr> anOldFeatList = aRefListOfBaseLines->list();
 126   std::list<ObjectPtr>::iterator aFeatIt = anOldFeatList.begin();
 127   anOldFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 128   anOldFeatureB = ModelAPI_Feature::feature(*aFeatIt);
 129
 130   if(!anOldFeatureA.get() || !anOldFeatureB.get()) {
 131     setError("One of the edges is empty");
 132     return;
 133   }
 134
 135   FeaturePtr aNewFeatureA, aNewFeatureB, aNewArc;
 136   if (needNewObjects) {
 137     // Create list of objects composing a fillet
 138     // copy aFeatureA
 139     aNewFeatureA = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureA, sketch());
 140     // copy aFeatureB
 141     aNewFeatureB = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureB, sketch());
 142     // create filleting arc (it will be attached to the list later)
 143     aNewArc = sketch()->addFeature(SketchPlugin_Arc::ID());
 144   } else {
 145     // Obtain features from the list
 146     std::list<ObjectPtr> aNewFeatList = aRefListOfFillet->list();
 147     std::list<ObjectPtr>::iterator aFeatIt = aNewFeatList.begin();
 148     aNewFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 149     aNewFeatureB = ModelAPI_Feature::feature(*aFeatIt++);
 150     aNewArc = ModelAPI_Feature::feature(*aFeatIt);
 151   }
 152
 153   // Calculate arc attributes
 154   static const int aNbFeatures = 2;
 155   FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 156   FeaturePtr aNewFeature[aNbFeatures] = {aNewFeatureA, aNewFeatureB};
 157   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures]; // tangent directions of the features in coincident point
 158   bool isStart[aNbFeatures]; // indicates which point the features share
 159   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2]; // first pair of points relate to first feature, second pair -  to second
 160   std::string aFeatAttributes[aNbFeatures * 2]; // attributes of features
 161   for (int i = 0; i < aNbFeatures; i++) {
 162     std::string aStartAttr, aEndAttr;
 163     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 164       aStartAttr = SketchPlugin_Line::START_ID();
 165       aEndAttr = SketchPlugin_Line::END_ID();
 166     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 167       aStartAttr = SketchPlugin_Arc::START_ID();
 168       aEndAttr = SketchPlugin_Arc::END_ID();
 169     } else { // wrong argument
 170       aRefListOfFillet->remove(aNewFeatureA);
 171       aRefListOfFillet->remove(aNewFeatureB);
 172       aRefListOfFillet->remove(aNewArc);
 173       aRefListOfBaseLines->clear();
 174       return;
 175     }
 176     aFeatAttributes[2*i] = aStartAttr;
 177     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 178         aFeature[i]->attribute(aStartAttr))->pnt();
 179     aFeatAttributes[2*i+1] = aEndAttr;
 180     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 181         aFeature[i]->attribute(aEndAttr))->pnt();
 182   }
 183   for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
 184     for (int j = 0; j < 2; j++) // loop on start-end of each feature
 185       if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPoint) < 1.e-10) {
 186         isStart[aFeatInd] = (j==0);
 187         break;
 188       }
 189   }
 190   // tangent directions of the features
 191   for (int i = 0; i < aNbFeatures; i++) {
 192     std::shared_ptr<GeomAPI_XY> aDir;
 193     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 194       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 195       if (!isStart[i])
 196         aDir = aDir->multiplied(-1.0);
 197     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 198       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 199           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 200           aNewFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 201       aDir = isStart[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 202       aDir = aDir->decreased(aCenterPoint->xy());
 203
 204       double x = aDir->x();
 205       double y = aDir->y();
 206       aDir->setX(-y);
 207       aDir->setY(x);
 208       if (isStart[i] == std::dynamic_pointer_cast<SketchPlugin_Arc>(aFeature[i])->isReversed())
 209         aDir = aDir->multiplied(-1.0);
 210     }
 211     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 212   }
 213
 214   // Wait all constraints being created, then send update events
 215   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 216   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 217   if (isUpdateFlushed)
 218     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 219
 220   // By default, the start point of fillet arc is connected to FeatureA,
 221   // and the end point - to FeatureB. But when the angle between TangentDirA and
 222   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 223   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A), where A and B - angles between corresponding tanget direction and the X axis
 224   bool isReversed = cosBA > 0.0;
 225
 226   // Calculate fillet arc parameters
 227   std::shared_ptr<GeomAPI_XY> aCenter, aTangentPntA, aTangentPntB;
 228   calculateFilletCenter(anOldFeatureA, anOldFeatureB, aFilletRadius, isStart, aCenter, aTangentPntA, aTangentPntB);
 229   if(!aCenter.get() || !aTangentPntA.get() || !aTangentPntB.get()) {
 230     setError("Can not create fillet with the specified parameters.");
 231     return;
 232   }
 233   // update features
 234   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 235       aNewFeatureA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(
 236       aTangentPntA->x(), aTangentPntA->y());
 237   aNewFeatureA->execute();
 238   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 239       aNewFeatureB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(
 240       aTangentPntB->x(), aTangentPntB->y());
 241   aNewFeatureB->execute();
 242   // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
 243   // by arc; moreover, it may cause cyclicity in hte mechanism of updater
 244   aNewArc->data()->blockSendAttributeUpdated(true);
 245   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 246       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 247       aCenter->x(), aCenter->y());
 248   if (isReversed) {
 249     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 250     aTangentPntA = aTangentPntB;
 251     aTangentPntB = aTmp;
 252   }
 253   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 254       aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 255   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 256       aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 257   if (aStartPoint->isInitialized() && aEndPoint->isInitialized() &&
 258      (aStartPoint->pnt()->xy()->distance(aTangentPntA) > aTol ||
 259       aEndPoint->pnt()->xy()->distance(aTangentPntB) > aTol))
 260     std::dynamic_pointer_cast<SketchPlugin_Arc>(aNewArc)->setReversed(false);
 261   aStartPoint->setValue(aTangentPntA->x(), aTangentPntA->y());
 262   aEndPoint->setValue(aTangentPntB->x(), aTangentPntB->y());
 263   aNewArc->data()->blockSendAttributeUpdated(false);
 264   aNewArc->execute();
 265
 266   if (needNewObjects) {
 267     // attach new arc to the list
 268     aRefListOfFillet->append(aNewFeatureA->lastResult());
 269     aRefListOfFillet->append(aNewFeatureB->lastResult());
 270     aRefListOfFillet->append(aNewArc->lastResult());
 271
 272     myProducedFeatures.push_back(aNewFeatureA);
 273     myProducedFeatures.push_back(aNewFeatureB);
 274     myProducedFeatures.push_back(aNewArc);
 275
 276     // Create list of additional constraints:
 277     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 278     // 1.1. coincidence
 279     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 280     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 281         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 282     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 283     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 284         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 285     int aFeatInd = isReversed ? 1 : 0;
 286     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 287     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 288     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 289     aConstraint->execute();
 290     myProducedFeatures.push_back(aConstraint);
 291     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 292     // 1.2. coincidence
 293     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 294     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 295         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 296     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 297     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 298         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 299     aFeatInd = isReversed ? 0 : 1;
 300     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 301     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 302     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 303     aConstraint->execute();
 304     myProducedFeatures.push_back(aConstraint);
 305     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 306     // 2. Fillet arc radius
 307     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 308     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 309     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 310     //aRefAttr->setObject(aNewArc->lastResult());
 311     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 312     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 313     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 314     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 315     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 316     //aConstraint->execute();
 317     //myProducedFeatures.push_back(aConstraint);
 318     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 319     // 3. Tangency of fillet arc and features
 320     for (int i = 0; i < aNbFeatures; i++) {
 321       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 322       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 323           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 324       aRefAttr->setObject(aNewArc->lastResult());
 325       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 326           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 327       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 328       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 329       aConstraint->execute();
 330       myProducedFeatures.push_back(aConstraint);
 331       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 332     }
 333     // 4. Coincidence of free boundaries of base and copied features
 334     for (int i = 0; i < aNbFeatures; i++) {
 335       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 336       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 337       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 338           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 339       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 340       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 341           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 342       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 343       myProducedFeatures.push_back(aConstraint);
 344     }
 345     // 5. Tangent points should be placed on the base features
 346     for (int i = 0; i < aNbFeatures; i++) {
 347       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 348       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 349       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 350           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 351       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 352       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 353           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 354       aRefAttr->setObject(aFeature[i]->lastResult());
 355       myProducedFeatures.push_back(aConstraint);
 356     }
 357     // make base features auxiliary
 358     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 359     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 360     myBaseObjects.clear();
 361     myBaseObjects.push_back(anOldFeatureA);
 362     myBaseObjects.push_back(anOldFeatureB);
 363     // exchange the naming IDs of newly created and old line that become auxiliary
 364     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 365     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 366   } else {
 367     // Update radius value
 368     int aNbSubs = sketch()->numberOfSubs();
 369     FeaturePtr aSubFeature;
 370     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 371       aSubFeature = sketch()->subFeature(aSub);
 372       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 373         continue;
 374       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 375           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 376       if (!aRefAttr || !aRefAttr->isObject())
 377         continue;
 378       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 379       if (aFeature == aNewArc) {
 380         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 381           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 382         aRadius->setValue(aFilletRadius);
 383         break;
 384       }
 385     }
 386   }
 387
 388   // send events to update the sub-features by the solver
 389   if (isUpdateFlushed)
 390     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 391
 392   // the viewer update should be unblocked in order after the fillet features
 393   // are processed by the solver
 394   //aMsg = std::shared_ptr<Events_Message>(
 395   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 396   //Events_Loop::loop()->send(aMsg);
 397 }
 398
 399 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 400 {
 401   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 402     // clear the list of fillet entities
 403     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 404         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 405     aRefListOfFillet->clear();
 406
 407     // clear the list of base features
 408     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 409         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 410       aRefListOfBaseLines->clear();
 411
 412     // remove all produced objects and constraints
 413     DocumentPtr aDoc = sketch()->document();
 414     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 415     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 416       aDoc->removeFeature(*aCIt);
 417     myProducedFeatures.clear();
 418
 419     // clear auxiliary flag on initial objects
 420     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 421       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 422     myBaseObjects.clear();
 423
 424     // Obtain fillet point
 425     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 426         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 427     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 428       return;
 429     }
 430     AttributePtr anAttrBaseA = aBaseA->attr();
 431     std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrBaseA);
 432     if (!aBasePoint) {
 433       return;
 434     }
 435     std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 436
 437     // Obtain conicident edges
 438     const std::set<AttributePtr>& aRefsList = anAttrBaseA->owner()->data()->refsToMe();
 439     std::set<AttributePtr>::const_iterator aIt;
 440     FeaturePtr aCoincident;
 441     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 442       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 443       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 444       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 445         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 446           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 447         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 448           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 449         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 450           AttributePtr anAttrA = anAttrRefA->attr();
 451           if(anAttrBaseA == anAttrA) {
 452             aCoincident = aConstrFeature;
 453             break;
 454           }
 455         }
 456         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 457           AttributePtr anAttrB = anAttrRefB->attr();
 458           if(anAttrBaseA == anAttrB) {
 459             aCoincident = aConstrFeature;
 460             break;
 461           }
 462         }
 463       }
 464     }
 465
 466     if(!aCoincident.get()) {
 467       setError("No coincident edges at selected vertex");
 468       return;
 469     }
 470
 471     std::set<FeaturePtr> aCoinsideLines;
 472     SketchPlugin_Tools::findCoincidences(aCoincident,
 473                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 474                                          aCoinsideLines);
 475     SketchPlugin_Tools::findCoincidences(aCoincident,
 476                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 477                                          aCoinsideLines);
 478
 479     // Remove auxilary lines
 480     if(aCoinsideLines.size() > 2) {
 481       std::set<FeaturePtr> aNewLines;
 482       for(std::set<FeaturePtr>::iterator anIt = aCoinsideLines.begin(); anIt != aCoinsideLines.end(); ++anIt) {
 483         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 484           aNewLines.insert(*anIt);
 485         }
 486       }
 487       aCoinsideLines = aNewLines;
 488     }
 489
 490     if(aCoinsideLines.size() != 2) {
 491       setError("At selected vertex should be two coincident lines");
 492       return;
 493     }
 494
 495     // Store base lines
 496     FeaturePtr anOldFeatureA, anOldFeatureB;
 497     std::set<FeaturePtr>::iterator aLinesIt = aCoinsideLines.begin();
 498     anOldFeatureA = *aLinesIt++;
 499     anOldFeatureB = *aLinesIt;
 500     aRefListOfBaseLines->append(anOldFeatureA);
 501     aRefListOfBaseLines->append(anOldFeatureB);
 502
 503     // Getting points located at 1/3 of edge length from fillet point
 504     std::shared_ptr<GeomAPI_Pnt2d> aPntA, aPntB;
 505     getPointOnEdge(anOldFeatureA, aFilletPoint, aPntA);
 506     getPointOnEdge(anOldFeatureB, aFilletPoint, aPntB);
 507
 508     /// Getting distances
 509     double aRadius = 1;
 510     double aDistanceA = getProjectionDistance(anOldFeatureB, aPntA);
 511     double aDistanceB = getProjectionDistance(anOldFeatureA, aPntB);
 512     aRadius = aDistanceA < aDistanceB ? aDistanceA / 2.0 : aDistanceB / 2.0;
 513
 514     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aRadius);
 515   }
 516 }
 517
 518 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 519 {
 520   if (!sketch())
 521     return thePrevious;
 522
 523   AISObjectPtr anAIS = thePrevious;
 524   /// TODO: Equal constraint presentation should be put here
 525   return anAIS;
 526 }
 527
 528 bool SketchPlugin_ConstraintFillet::isMacro() const
 529 {
 530   return true;
 531 }
 532
 533
 534 // =========   Auxiliary functions   =================
 535 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 536                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 537 {
 538   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 539       theNewArc->attribute(theNewArcAttribute))->pnt();
 540   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 541       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 542 }
 543
 544 /// \brief Find intersections of lines shifted along normal direction
 545 void possibleFilletCenterLineLine(
 546     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 547     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 548     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 549 {
 550   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 551   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 552   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 553   double aDet = theDirA->cross(theDirB);
 554   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 555     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 556     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 557       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 558       double aVX = aDirAT->xy()->dot(aPntA);
 559       double aVY = aDirBT->xy()->dot(aPntB);
 560       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 561           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 562           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 563       theCenters.push_back(aPoint);
 564     }
 565   }
 566 }
 567
 568 /// \brief Find intersections of line shifted along normal direction in both sides
 569 ///        and a circle with extended radius
 570 void possibleFilletCenterLineArc(
 571     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 572     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 573     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 574 {
 575   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 576   std::shared_ptr<GeomAPI_XY> aPnt;
 577   double aDirNorm2 = theDirLine->dot(theDirLine);
 578   double aRad = 0.0;
 579   double aDirX = theDirLine->x();
 580   double aDirX2 = theDirLine->x() * theDirLine->x();
 581   double aDirY2 = theDirLine->y() * theDirLine->y();
 582   double aDirXY = theDirLine->x() * theDirLine->y();
 583   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 584     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 585     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 586     double aCoeff2 = aCoeff * aCoeff;
 587     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 588       aRad = theRadiusArc + aStepB * theRadius;
 589       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 590       if (aD < 0.0)
 591         continue;
 592       double aDs = sqrt(aD);
 593       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 594       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 595       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 596           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 597       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 598           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 599
 600       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 601       theCenters.push_back(aPoint1);
 602       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 603       theCenters.push_back(aPoint2);
 604     }
 605   }
 606 }
 607
 608 /// \brief Find intersections of two circles with extended radii
 609 void possibleFilletCenterArcArc(
 610     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 611     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 612     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 613 {
 614   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 615   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 616   double aCenterDist = sqrt(aCenterDist2);
 617
 618   double aRadA, aRadB;
 619   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 620     aRadA = theRadiusA + aStepA * theRadius;
 621     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 622       aRadB = theRadiusB + aStepB * theRadius;
 623       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 624         continue; // there is no intersections
 625
 626       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 627       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 628
 629       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 630       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 631
 632       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 633       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 634
 635       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 636       theCenters.push_back(aPoint1);
 637       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 638       theCenters.push_back(aPoint2);
 639     }
 640   }
 641 }
 642
 643 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 644                            double theRadius, bool theNotInversed[2],
 645                            std::shared_ptr<GeomAPI_XY>& theCenter,
 646                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 647                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 648 {
 649   static const int aNbFeatures = 2;
 650   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 651   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 652   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 653
 654   for (int i = 0; i < aNbFeatures; i++) {
 655     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 656       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 657           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 658       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 659           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 660     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 661       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 662           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 663       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 664           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 665       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 666           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 667     } else
 668       return;
 669     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 670         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 671         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 672     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 673         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 674         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 675   }
 676
 677   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 678       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 679     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 680     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 681     for (int i = 0; i < aNbFeatures; i++) {
 682       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 683       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 684     }
 685
 686     // get and filter possible centers
 687     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 688     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 689     double aDot = 0.0;
 690     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 691     for (; anIt != aSuspectCenters.end(); anIt++) {
 692       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 693       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 694       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 695         continue; // incorrect position
 696       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 697       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 698       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 699         continue; // incorrect position
 700       // the center is found, stop searching
 701       theCenter = *anIt;
 702       return;
 703     }
 704   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 705       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 706       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 707       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 708     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 709     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 710     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 711         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 712     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 713         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 714
 715     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 716         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 717     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 718         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 719     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 720
 721     // get possible centers and filter them
 722     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 723     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 724     double aDot = 0.0;
 725     // the line is forward into the arc
 726     double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
 727     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 728     // The possible centers are ranged by their positions.
 729     // If the point is not satisfy one of criteria, the weight is decreased with penalty.
 730     int aBestWeight = 0;
 731     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 732     for (; anIt != aSuspectCenters.end(); anIt++) {
 733       int aWeight = 2;
 734       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 735       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 736       // Check the point is placed on the correct arc (penalty if false)
 737       if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
 738         aWeight -= 1;
 739       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 740           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 741       double aCurAngle = aCurDir->angle(aStartArcDir);
 742       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 743       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 744         continue;
 745       if (aWeight > aBestWeight)
 746         aBestWeight = aWeight;
 747       else if (aWeight < aBestWeight ||
 748                aStart[aLineInd]->distance(*anIt) >
 749                aStart[aLineInd]->distance(theCenter)) // <-- take closer point
 750         continue;
 751       // the center is found, stop searching
 752       theCenter = *anIt;
 753       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 754       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 755         theTangentA = aLineTgPoint;
 756         theTangentB = anArcTgPoint;
 757       } else {
 758         theTangentA = anArcTgPoint;
 759         theTangentB = aLineTgPoint;
 760       }
 761       //return;
 762     }
 763   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 764       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 765     double anArcRadius[aNbFeatures];
 766     double anArcAngle[aNbFeatures];
 767     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 768     for (int i = 0; i < aNbFeatures; i++) {
 769       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 770       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 771           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 772       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 773           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 774       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 775     }
 776
 777     // get and filter possible centers
 778     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 779     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 780     double aDot = 0.0;
 781     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 782     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 783     for (; anIt != aSuspectCenters.end(); anIt++) {
 784       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 785           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 786       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 787       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 788       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 789         continue; // incorrect position
 790       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 791
 792       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 793       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 794       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 795       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 796         continue; // incorrect position
 797       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 798
 799       // the center is found, stop searching
 800       theCenter = *anIt;
 801       return;
 802     }
 803   }
 804 }
 805
 806 void getPointOnEdge(const FeaturePtr theFeature,
 807                     const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
 808                     std::shared_ptr<GeomAPI_Pnt2d>& thePoint) {
 809   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 810     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 811       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 812     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 813       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 814     if(aPntStart->distance(theFilletPoint) > 1.e-7) {
 815       aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 816         theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 817       aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 818         theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 819     }
 820     thePoint.reset( new GeomAPI_Pnt2d(aPntStart->xy()->added( aPntEnd->xy()->decreased( aPntStart->xy() )->multiplied(1.0 / 3.0) ) ) );
 821   } else {
 822     std::shared_ptr<GeomAPI_Pnt2d> aPntTemp;
 823     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 824       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 825     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 826       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 827     if(theFeature->attribute(SketchPlugin_Arc::INVERSED_ID())) {
 828       aPntTemp = aPntStart;
 829       aPntStart = aPntEnd;
 830       aPntEnd = aPntTemp;
 831     }
 832     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 833       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 834     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 835     double aStartParameter(0), anEndParameter(0);
 836     aCirc->parameter(aPntStart, paramTolerance, aStartParameter);
 837     aCirc->parameter(aPntEnd, paramTolerance, anEndParameter);
 838     if(aPntStart->distance(theFilletPoint) > tolerance) {
 839       double aTmpParameter = aStartParameter;
 840       aStartParameter = anEndParameter;
 841       anEndParameter = aTmpParameter;
 842     }
 843     double aPntParameter = aStartParameter + (anEndParameter - aStartParameter) / 3.0;
 844     aCirc->D0(aPntParameter, thePoint);
 845   }
 846 }
 847
 848 double getProjectionDistance(const FeaturePtr theFeature,
 849                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint)
 850 {
 851   std::shared_ptr<GeomAPI_Pnt2d> aProjectPnt;
 852   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 853     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 854       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 855     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 856       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 857     std::shared_ptr<GeomAPI_Lin2d> aLin(new GeomAPI_Lin2d(aPntStart, aPntEnd));
 858     aProjectPnt = aLin->project(thePoint);
 859   } else {
 860     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 861       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 862     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 863       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 864     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 865       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 866     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 867     aProjectPnt = aCirc->project(thePoint);
 868   }
 869   if(aProjectPnt.get()) {
 870     return aProjectPnt->distance(thePoint);
 871   }
 872   return -1;
 873 }