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   // update features
 230   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 231       aNewFeatureA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(
 232       aTangentPntA->x(), aTangentPntA->y());
 233   aNewFeatureA->execute();
 234   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 235       aNewFeatureB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(
 236       aTangentPntB->x(), aTangentPntB->y());
 237   aNewFeatureB->execute();
 238   // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
 239   // by arc; moreover, it may cause cyclicity in hte mechanism of updater
 240   aNewArc->data()->blockSendAttributeUpdated(true);
 241   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 242       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 243       aCenter->x(), aCenter->y());
 244   if (isReversed) {
 245     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 246     aTangentPntA = aTangentPntB;
 247     aTangentPntB = aTmp;
 248   }
 249   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 250       aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 251   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 252       aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 253   if (aStartPoint->isInitialized() && aEndPoint->isInitialized() &&
 254      (aStartPoint->pnt()->xy()->distance(aTangentPntA) > aTol ||
 255       aEndPoint->pnt()->xy()->distance(aTangentPntB) > aTol))
 256     std::dynamic_pointer_cast<SketchPlugin_Arc>(aNewArc)->setReversed(false);
 257   aStartPoint->setValue(aTangentPntA->x(), aTangentPntA->y());
 258   aEndPoint->setValue(aTangentPntB->x(), aTangentPntB->y());
 259   aNewArc->data()->blockSendAttributeUpdated(false);
 260   aNewArc->execute();
 261
 262   if (needNewObjects) {
 263     // attach new arc to the list
 264     aRefListOfFillet->append(aNewFeatureA->lastResult());
 265     aRefListOfFillet->append(aNewFeatureB->lastResult());
 266     aRefListOfFillet->append(aNewArc->lastResult());
 267
 268     myProducedFeatures.push_back(aNewFeatureA);
 269     myProducedFeatures.push_back(aNewFeatureB);
 270     myProducedFeatures.push_back(aNewArc);
 271
 272     // Create list of additional constraints:
 273     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 274     // 1.1. coincidence
 275     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 276     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 277         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 278     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 279     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 280         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 281     int aFeatInd = isReversed ? 1 : 0;
 282     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 283     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 284     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 285     aConstraint->execute();
 286     myProducedFeatures.push_back(aConstraint);
 287     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 288     // 1.2. coincidence
 289     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 290     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 291         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 292     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 293     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 294         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 295     aFeatInd = isReversed ? 0 : 1;
 296     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 297     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 298     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 299     aConstraint->execute();
 300     myProducedFeatures.push_back(aConstraint);
 301     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 302     // 2. Fillet arc radius
 303     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 304     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 305     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 306     //aRefAttr->setObject(aNewArc->lastResult());
 307     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 308     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 309     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 310     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 311     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 312     //aConstraint->execute();
 313     //myProducedFeatures.push_back(aConstraint);
 314     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 315     // 3. Tangency of fillet arc and features
 316     for (int i = 0; i < aNbFeatures; i++) {
 317       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 318       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 319           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 320       aRefAttr->setObject(aNewArc->lastResult());
 321       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 322           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 323       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 324       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 325       aConstraint->execute();
 326       myProducedFeatures.push_back(aConstraint);
 327       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 328     }
 329     // 4. Coincidence of free boundaries of base and copied features
 330     for (int i = 0; i < aNbFeatures; i++) {
 331       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 332       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 333       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 334           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 335       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 336       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 337           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 338       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 339       myProducedFeatures.push_back(aConstraint);
 340     }
 341     // 5. Tangent points should be placed on the base features
 342     for (int i = 0; i < aNbFeatures; i++) {
 343       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 344       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 345       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 346           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 347       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 348       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 349           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 350       aRefAttr->setObject(aFeature[i]->lastResult());
 351       myProducedFeatures.push_back(aConstraint);
 352     }
 353     // make base features auxiliary
 354     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 355     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 356     myBaseObjects.clear();
 357     myBaseObjects.push_back(anOldFeatureA);
 358     myBaseObjects.push_back(anOldFeatureB);
 359     // exchange the naming IDs of newly created and old line that become auxiliary
 360     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 361     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 362   } else {
 363     // Update radius value
 364     int aNbSubs = sketch()->numberOfSubs();
 365     FeaturePtr aSubFeature;
 366     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 367       aSubFeature = sketch()->subFeature(aSub);
 368       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 369         continue;
 370       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 371           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 372       if (!aRefAttr || !aRefAttr->isObject())
 373         continue;
 374       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 375       if (aFeature == aNewArc) {
 376         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 377           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 378         aRadius->setValue(aFilletRadius);
 379         break;
 380       }
 381     }
 382   }
 383
 384   // send events to update the sub-features by the solver
 385   if (isUpdateFlushed)
 386     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 387
 388   // the viewer update should be unblocked in order after the fillet features
 389   // are processed by the solver
 390   //aMsg = std::shared_ptr<Events_Message>(
 391   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 392   //Events_Loop::loop()->send(aMsg);
 393 }
 394
 395 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 396 {
 397   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 398     // clear the list of fillet entities
 399     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 400         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 401     aRefListOfFillet->clear();
 402
 403     // clear the list of base features
 404     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 405         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 406       aRefListOfBaseLines->clear();
 407
 408     // remove all produced objects and constraints
 409     DocumentPtr aDoc = sketch()->document();
 410     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 411     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 412       aDoc->removeFeature(*aCIt);
 413     myProducedFeatures.clear();
 414
 415     // clear auxiliary flag on initial objects
 416     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 417       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 418     myBaseObjects.clear();
 419
 420     // Obtain fillet point
 421     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 422         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 423     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 424       return;
 425     }
 426     AttributePtr anAttrBaseA = aBaseA->attr();
 427     std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrBaseA);
 428     if (!aBasePoint) {
 429       return;
 430     }
 431     std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 432
 433     // Obtain conicident edges
 434     const std::set<AttributePtr>& aRefsList = anAttrBaseA->owner()->data()->refsToMe();
 435     std::set<AttributePtr>::const_iterator aIt;
 436     FeaturePtr aCoincident;
 437     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 438       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 439       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 440       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 441         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 442           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 443         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 444           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 445         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 446           AttributePtr anAttrA = anAttrRefA->attr();
 447           if(anAttrBaseA == anAttrA) {
 448             aCoincident = aConstrFeature;
 449             break;
 450           }
 451         }
 452         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 453           AttributePtr anAttrB = anAttrRefB->attr();
 454           if(anAttrBaseA == anAttrB) {
 455             aCoincident = aConstrFeature;
 456             break;
 457           }
 458         }
 459       }
 460     }
 461
 462     if(!aCoincident.get()) {
 463       setError("No coincident edges at selected vertex");
 464       return;
 465     }
 466
 467     std::set<FeaturePtr> aCoinsideLines;
 468     SketchPlugin_Tools::findCoincidences(aCoincident,
 469                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 470                                          aCoinsideLines);
 471     SketchPlugin_Tools::findCoincidences(aCoincident,
 472                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 473                                          aCoinsideLines);
 474
 475     // Remove auxilary lines
 476     if(aCoinsideLines.size() > 2) {
 477       std::set<FeaturePtr> aNewLines;
 478       for(std::set<FeaturePtr>::iterator anIt = aCoinsideLines.begin(); anIt != aCoinsideLines.end(); ++anIt) {
 479         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 480           aNewLines.insert(*anIt);
 481         }
 482       }
 483       aCoinsideLines = aNewLines;
 484     }
 485
 486     if(aCoinsideLines.size() != 2) {
 487       setError("At selected vertex should be two coincident lines");
 488       return;
 489     }
 490
 491     // Store base lines
 492     FeaturePtr anOldFeatureA, anOldFeatureB;
 493     std::set<FeaturePtr>::iterator aLinesIt = aCoinsideLines.begin();
 494     anOldFeatureA = *aLinesIt++;
 495     anOldFeatureB = *aLinesIt;
 496     aRefListOfBaseLines->append(anOldFeatureA);
 497     aRefListOfBaseLines->append(anOldFeatureB);
 498
 499     // Getting points located at 1/3 of edge length from fillet point
 500     std::shared_ptr<GeomAPI_Pnt2d> aPntA, aPntB;
 501     getPointOnEdge(anOldFeatureA, aFilletPoint, aPntA);
 502     getPointOnEdge(anOldFeatureB, aFilletPoint, aPntB);
 503
 504     /// Getting distances
 505     double aRadius = 1;
 506     double aDistanceA = getProjectionDistance(anOldFeatureB, aPntA);
 507     double aDistanceB = getProjectionDistance(anOldFeatureA, aPntB);
 508     aRadius = aDistanceA < aDistanceB ? aDistanceA / 2.0 : aDistanceB / 2.0;
 509
 510     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aRadius);
 511   }
 512 }
 513
 514 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 515 {
 516   if (!sketch())
 517     return thePrevious;
 518
 519   AISObjectPtr anAIS = thePrevious;
 520   /// TODO: Equal constraint presentation should be put here
 521   return anAIS;
 522 }
 523
 524 bool SketchPlugin_ConstraintFillet::isMacro() const
 525 {
 526   return true;
 527 }
 528
 529
 530 // =========   Auxiliary functions   =================
 531 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 532                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 533 {
 534   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 535       theNewArc->attribute(theNewArcAttribute))->pnt();
 536   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 537       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 538 }
 539
 540 /// \brief Find intersections of lines shifted along normal direction
 541 void possibleFilletCenterLineLine(
 542     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 543     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 544     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 545 {
 546   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 547   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 548   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 549   double aDet = theDirA->cross(theDirB);
 550   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 551     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 552     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 553       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 554       double aVX = aDirAT->xy()->dot(aPntA);
 555       double aVY = aDirBT->xy()->dot(aPntB);
 556       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 557           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 558           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 559       theCenters.push_back(aPoint);
 560     }
 561   }
 562 }
 563
 564 /// \brief Find intersections of line shifted along normal direction in both sides
 565 ///        and a circle with extended radius
 566 void possibleFilletCenterLineArc(
 567     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 568     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 569     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 570 {
 571   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 572   std::shared_ptr<GeomAPI_XY> aPnt;
 573   double aDirNorm2 = theDirLine->dot(theDirLine);
 574   double aRad = 0.0;
 575   double aDirX = theDirLine->x();
 576   double aDirX2 = theDirLine->x() * theDirLine->x();
 577   double aDirY2 = theDirLine->y() * theDirLine->y();
 578   double aDirXY = theDirLine->x() * theDirLine->y();
 579   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 580     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 581     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 582     double aCoeff2 = aCoeff * aCoeff;
 583     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 584       aRad = theRadiusArc + aStepB * theRadius;
 585       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 586       if (aD < 0.0)
 587         continue;
 588       double aDs = sqrt(aD);
 589       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 590       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 591       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 592           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 593       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 594           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 595
 596       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 597       theCenters.push_back(aPoint1);
 598       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 599       theCenters.push_back(aPoint2);
 600     }
 601   }
 602 }
 603
 604 /// \brief Find intersections of two circles with extended radii
 605 void possibleFilletCenterArcArc(
 606     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 607     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 608     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 609 {
 610   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 611   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 612   double aCenterDist = sqrt(aCenterDist2);
 613
 614   double aRadA, aRadB;
 615   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 616     aRadA = theRadiusA + aStepA * theRadius;
 617     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 618       aRadB = theRadiusB + aStepB * theRadius;
 619       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 620         continue; // there is no intersections
 621
 622       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 623       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 624
 625       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 626       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 627
 628       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 629       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 630
 631       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 632       theCenters.push_back(aPoint1);
 633       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 634       theCenters.push_back(aPoint2);
 635     }
 636   }
 637 }
 638
 639 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 640                            double theRadius, bool theNotInversed[2],
 641                            std::shared_ptr<GeomAPI_XY>& theCenter,
 642                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 643                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 644 {
 645   static const int aNbFeatures = 2;
 646   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 647   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 648   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 649
 650   for (int i = 0; i < aNbFeatures; i++) {
 651     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 652       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 653           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 654       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 655           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 656     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 657       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 658           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 659       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 660           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 661       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 662           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 663     } else
 664       return;
 665     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 666         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 667         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 668     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 669         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 670         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 671   }
 672
 673   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 674       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 675     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 676     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 677     for (int i = 0; i < aNbFeatures; i++) {
 678       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 679       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 680     }
 681
 682     // get and filter possible centers
 683     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 684     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 685     double aDot = 0.0;
 686     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 687     for (; anIt != aSuspectCenters.end(); anIt++) {
 688       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 689       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 690       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 691         continue; // incorrect position
 692       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 693       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 694       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 695         continue; // incorrect position
 696       // the center is found, stop searching
 697       theCenter = *anIt;
 698       return;
 699     }
 700   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 701       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 702       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 703       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 704     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 705     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 706     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 707         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 708     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 709         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 710
 711     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 712         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 713     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 714         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 715     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 716
 717     // get possible centers and filter them
 718     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 719     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 720     double aDot = 0.0;
 721     // the line is forward into the arc
 722     double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
 723     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 724     // The possible centers are ranged by their positions.
 725     // If the point is not satisfy one of criteria, the weight is decreased with penalty.
 726     int aBestWeight = 0;
 727     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 728     for (; anIt != aSuspectCenters.end(); anIt++) {
 729       int aWeight = 2;
 730       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 731       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 732       // Check the point is placed on the correct arc (penalty if false)
 733       if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
 734         aWeight -= 1;
 735       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 736           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 737       double aCurAngle = aCurDir->angle(aStartArcDir);
 738       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 739       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 740         continue;
 741       if (aWeight > aBestWeight)
 742         aBestWeight = aWeight;
 743       else if (aWeight < aBestWeight ||
 744                aStart[aLineInd]->distance(*anIt) >
 745                aStart[aLineInd]->distance(theCenter)) // <-- take closer point
 746         continue;
 747       // the center is found, stop searching
 748       theCenter = *anIt;
 749       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 750       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 751         theTangentA = aLineTgPoint;
 752         theTangentB = anArcTgPoint;
 753       } else {
 754         theTangentA = anArcTgPoint;
 755         theTangentB = aLineTgPoint;
 756       }
 757       //return;
 758     }
 759   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 760       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 761     double anArcRadius[aNbFeatures];
 762     double anArcAngle[aNbFeatures];
 763     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 764     for (int i = 0; i < aNbFeatures; i++) {
 765       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 766       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 767           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 768       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 769           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 770       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 771     }
 772
 773     // get and filter possible centers
 774     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 775     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 776     double aDot = 0.0;
 777     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 778     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 779     for (; anIt != aSuspectCenters.end(); anIt++) {
 780       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 781           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 782       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 783       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 784       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 785         continue; // incorrect position
 786       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 787
 788       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 789       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 790       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 791       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 792         continue; // incorrect position
 793       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 794
 795       // the center is found, stop searching
 796       theCenter = *anIt;
 797       return;
 798     }
 799   }
 800 }
 801
 802 void getPointOnEdge(const FeaturePtr theFeature,
 803                     const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
 804                     std::shared_ptr<GeomAPI_Pnt2d>& thePoint) {
 805   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 806     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 807       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 808     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 809       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 810     if(aPntStart->distance(theFilletPoint) > 1.e-7) {
 811       aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 812         theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 813       aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 814         theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 815     }
 816     thePoint.reset( new GeomAPI_Pnt2d(aPntStart->xy()->added( aPntEnd->xy()->decreased( aPntStart->xy() )->multiplied(1.0 / 3.0) ) ) );
 817   } else {
 818     std::shared_ptr<GeomAPI_Pnt2d> aPntTemp;
 819     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 820       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 821     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 822       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 823     if(theFeature->attribute(SketchPlugin_Arc::INVERSED_ID())) {
 824       aPntTemp = aPntStart;
 825       aPntStart = aPntEnd;
 826       aPntEnd = aPntTemp;
 827     }
 828     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 829       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 830     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 831     double aStartParameter(0), anEndParameter(0);
 832     aCirc->parameter(aPntStart, paramTolerance, aStartParameter);
 833     aCirc->parameter(aPntEnd, paramTolerance, anEndParameter);
 834     if(aPntStart->distance(theFilletPoint) > tolerance) {
 835       double aTmpParameter = aStartParameter;
 836       aStartParameter = anEndParameter;
 837       anEndParameter = aTmpParameter;
 838     }
 839     double aPntParameter = aStartParameter + (anEndParameter - aStartParameter) / 3.0;
 840     aCirc->D0(aPntParameter, thePoint);
 841   }
 842 }
 843
 844 double getProjectionDistance(const FeaturePtr theFeature,
 845                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint)
 846 {
 847   std::shared_ptr<GeomAPI_Pnt2d> aProjectPnt;
 848   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 849     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 850       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 851     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 852       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 853     std::shared_ptr<GeomAPI_Lin2d> aLin(new GeomAPI_Lin2d(aPntStart, aPntEnd));
 854     aProjectPnt = aLin->project(thePoint);
 855   } else {
 856     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 857       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 858     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 859       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 860     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 861       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 862     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 863     aProjectPnt = aCirc->project(thePoint);
 864   }
 865   if(aProjectPnt.get()) {
 866     return aProjectPnt->distance(thePoint);
 867   }
 868   return -1;
 869 }