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_Point.h>
  31 #include <SketchPlugin_Tools.h>
  32
  33 #include <SketcherPrs_Factory.h>
  34 #include <SketcherPrs_Tools.h>
  35
  36 #include <Config_PropManager.h>
  37 #include <Events_Loop.h>
  38
  39 #define _USE_MATH_DEFINES
  40 #include <math.h>
  41
  42 static const std::string PREVIOUS_VALUE("FilletPreviousRadius");
  43
  44 const double tolerance = 1.e-7;
  45 const double paramTolerance = 1.e-4;
  46
  47 /// \brief Attract specified point on theNewArc to the attribute of theFeature
  48 static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
  49   FeaturePtr theFeature, const std::string& theFeatureAttribute);
  50
  51 /// \brief Calculates center of fillet arc and coordinates of tangency points
  52 static void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
  53                                   double theRadius, bool theNotInversed[2],
  54                                   std::shared_ptr<GeomAPI_XY>& theCenter,
  55                                   std::shared_ptr<GeomAPI_XY>& theTangentA,
  56                                   std::shared_ptr<GeomAPI_XY>& theTangentB);
  57
  58 /// Get point on 1/3 length of edge from fillet point
  59 static void getPointOnEdge(const FeaturePtr theFeature,
  60                            const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
  61                            std::shared_ptr<GeomAPI_Pnt2d>& thePoint);
  62
  63 /// Get distance from point to feature
  64 static double getProjectionDistance(const FeaturePtr theFeature,
  65                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint);
  66
  67 SketchPlugin_ConstraintFillet::SketchPlugin_ConstraintFillet()
  68 {
  69 }
  70
  71 void SketchPlugin_ConstraintFillet::initAttributes()
  72 {
  73   data()->addAttribute(SketchPlugin_Constraint::VALUE(), ModelAPI_AttributeDouble::typeId());
  74   data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefAttr::typeId());
  75   data()->addAttribute(SketchPlugin_Constraint::ENTITY_B(), ModelAPI_AttributeRefList::typeId());
  76   // This attribute used to store base edges
  77   data()->addAttribute(SketchPlugin_Constraint::ENTITY_C(), ModelAPI_AttributeRefList::typeId());
  78   data()->addAttribute(PREVIOUS_VALUE, ModelAPI_AttributeDouble::typeId());
  79   // initialize attribute not applicable for user
  80   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_B());
  81   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_C());
  82   data()->attribute(PREVIOUS_VALUE)->setInitialized();
  83   std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(PREVIOUS_VALUE))->setValue(0.0);
  84 }
  85
  86 void SketchPlugin_ConstraintFillet::execute()
  87 {
  88   static const double aTol = 1.e-7;
  89
  90   // the viewer update should be blocked in order to avoid the temporaty fillet sub-features visualization
  91   // before they are processed by the solver
  92   //std::shared_ptr<Events_Message> aMsg = std::shared_ptr<Events_Message>(
  93   //    new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_BLOCKED)));
  94   //Events_Loop::loop()->send(aMsg);
  95
  96   std::shared_ptr<ModelAPI_Data> aData = data();
  97   ResultConstructionPtr aRC;
  98   // Check the base objects are initialized
  99   double aFilletRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 100       aData->attribute(SketchPlugin_Constraint::VALUE()))->value();
 101   AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 102       aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
 103   if (!aBaseA->isInitialized() || aBaseA->isObject()) {
 104     setError("Bad vertex selected");
 105     return;
 106   }
 107
 108   // Obtain fillet point
 109   std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aBaseA->attr());
 110   if (!aBasePoint) {
 111     setError("Bad vertex selected");
 112     return;
 113   }
 114   std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 115
 116   // Check the fillet shapes is not initialized yet
 117   AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 118       aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
 119   bool needNewObjects = aRefListOfFillet->size() == 0;
 120
 121   AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 122       aData->attribute(SketchPlugin_Constraint::ENTITY_C()));
 123
 124   // Obtain base features
 125   FeaturePtr anOldFeatureA, anOldFeatureB;
 126   std::list<ObjectPtr> anOldFeatList = aRefListOfBaseLines->list();
 127   std::list<ObjectPtr>::iterator aFeatIt = anOldFeatList.begin();
 128   anOldFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 129   anOldFeatureB = ModelAPI_Feature::feature(*aFeatIt);
 130
 131   if(!anOldFeatureA.get() || !anOldFeatureB.get()) {
 132     setError("One of the edges is empty");
 133     return;
 134   }
 135
 136   FeaturePtr aNewFeatureA, aNewFeatureB, aNewArc;
 137   if (needNewObjects) {
 138     // Create list of objects composing a fillet
 139     // copy aFeatureA
 140     aNewFeatureA = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureA, sketch());
 141     // copy aFeatureB
 142     aNewFeatureB = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(anOldFeatureB, sketch());
 143     // create filleting arc (it will be attached to the list later)
 144     aNewArc = sketch()->addFeature(SketchPlugin_Arc::ID());
 145   } else {
 146     // Obtain features from the list
 147     std::list<ObjectPtr> aNewFeatList = aRefListOfFillet->list();
 148     std::list<ObjectPtr>::iterator aFeatIt = aNewFeatList.begin();
 149     aNewFeatureA = ModelAPI_Feature::feature(*aFeatIt++);
 150     aNewFeatureB = ModelAPI_Feature::feature(*aFeatIt++);
 151     aNewArc = ModelAPI_Feature::feature(*aFeatIt);
 152   }
 153
 154   // Calculate arc attributes
 155   static const int aNbFeatures = 2;
 156   FeaturePtr aFeature[aNbFeatures] = {anOldFeatureA, anOldFeatureB};
 157   FeaturePtr aNewFeature[aNbFeatures] = {aNewFeatureA, aNewFeatureB};
 158   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures]; // tangent directions of the features in coincident point
 159   bool isStart[aNbFeatures]; // indicates which point the features share
 160   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2]; // first pair of points relate to first feature, second pair -  to second
 161   std::string aFeatAttributes[aNbFeatures * 2]; // attributes of features
 162   for (int i = 0; i < aNbFeatures; i++) {
 163     std::string aStartAttr, aEndAttr;
 164     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 165       aStartAttr = SketchPlugin_Line::START_ID();
 166       aEndAttr = SketchPlugin_Line::END_ID();
 167     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 168       aStartAttr = SketchPlugin_Arc::START_ID();
 169       aEndAttr = SketchPlugin_Arc::END_ID();
 170     } else { // wrong argument
 171       aRefListOfFillet->remove(aNewFeatureA);
 172       aRefListOfFillet->remove(aNewFeatureB);
 173       aRefListOfFillet->remove(aNewArc);
 174       aRefListOfBaseLines->clear();
 175       return;
 176     }
 177     aFeatAttributes[2*i] = aStartAttr;
 178     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 179         aFeature[i]->attribute(aStartAttr))->pnt();
 180     aFeatAttributes[2*i+1] = aEndAttr;
 181     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 182         aFeature[i]->attribute(aEndAttr))->pnt();
 183   }
 184   for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
 185     for (int j = 0; j < 2; j++) // loop on start-end of each feature
 186       if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPoint) < 1.e-10) {
 187         isStart[aFeatInd] = (j==0);
 188         break;
 189       }
 190   }
 191   // tangent directions of the features
 192   for (int i = 0; i < aNbFeatures; i++) {
 193     std::shared_ptr<GeomAPI_XY> aDir;
 194     if (aNewFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 195       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 196       if (!isStart[i])
 197         aDir = aDir->multiplied(-1.0);
 198     } else if (aNewFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 199       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 200           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 201           aNewFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 202       aDir = isStart[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 203       aDir = aDir->decreased(aCenterPoint->xy());
 204
 205       double x = aDir->x();
 206       double y = aDir->y();
 207       aDir->setX(-y);
 208       aDir->setY(x);
 209       if (isStart[i] == std::dynamic_pointer_cast<SketchPlugin_Arc>(aFeature[i])->isReversed())
 210         aDir = aDir->multiplied(-1.0);
 211     }
 212     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 213   }
 214
 215   // Wait all constraints being created, then send update events
 216   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 217   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 218   if (isUpdateFlushed)
 219     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 220
 221   // By default, the start point of fillet arc is connected to FeatureA,
 222   // and the end point - to FeatureB. But when the angle between TangentDirA and
 223   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 224   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A), where A and B - angles between corresponding tanget direction and the X axis
 225   bool isReversed = cosBA > 0.0;
 226
 227   // Calculate fillet arc parameters
 228   std::shared_ptr<GeomAPI_XY> aCenter, aTangentPntA, aTangentPntB;
 229   calculateFilletCenter(anOldFeatureA, anOldFeatureB, aFilletRadius, isStart, aCenter, aTangentPntA, aTangentPntB);
 230   if(!aCenter.get() || !aTangentPntA.get() || !aTangentPntB.get()) {
 231     setError("Can not create fillet with the specified parameters.");
 232     return;
 233   }
 234   // update features
 235   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 236       aNewFeatureA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(
 237       aTangentPntA->x(), aTangentPntA->y());
 238   aNewFeatureA->execute();
 239   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 240       aNewFeatureB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(
 241       aTangentPntB->x(), aTangentPntB->y());
 242   aNewFeatureB->execute();
 243   // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
 244   // by arc; moreover, it may cause cyclicity in hte mechanism of updater
 245   aNewArc->data()->blockSendAttributeUpdated(true);
 246   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 247       aNewArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(
 248       aCenter->x(), aCenter->y());
 249   if (isReversed) {
 250     std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
 251     aTangentPntA = aTangentPntB;
 252     aTangentPntB = aTmp;
 253   }
 254   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 255       aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 256   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 257       aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 258   if (aStartPoint->isInitialized() && aEndPoint->isInitialized() &&
 259      (aStartPoint->pnt()->xy()->distance(aTangentPntA) > aTol ||
 260       aEndPoint->pnt()->xy()->distance(aTangentPntB) > aTol))
 261     std::dynamic_pointer_cast<SketchPlugin_Arc>(aNewArc)->setReversed(false);
 262   aStartPoint->setValue(aTangentPntA->x(), aTangentPntA->y());
 263   aEndPoint->setValue(aTangentPntB->x(), aTangentPntB->y());
 264   aNewArc->data()->blockSendAttributeUpdated(false);
 265   aNewArc->execute();
 266
 267   if (needNewObjects) {
 268     // attach new arc to the list
 269     aRefListOfFillet->append(aNewFeatureA->lastResult());
 270     aRefListOfFillet->append(aNewFeatureB->lastResult());
 271     aRefListOfFillet->append(aNewArc->lastResult());
 272
 273     myProducedFeatures.push_back(aNewFeatureA);
 274     myProducedFeatures.push_back(aNewFeatureB);
 275     myProducedFeatures.push_back(aNewArc);
 276
 277     // Create list of additional constraints:
 278     // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
 279     // 1.1. coincidence
 280     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 281     AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 282         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 283     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::START_ID()));
 284     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 285         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 286     int aFeatInd = isReversed ? 1 : 0;
 287     int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
 288     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 289     recalculateAttributes(aNewArc, SketchPlugin_Arc::START_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 290     aConstraint->execute();
 291     myProducedFeatures.push_back(aConstraint);
 292     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 293     // 1.2. coincidence
 294     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 295     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 296         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 297     aRefAttr->setAttr(aNewArc->attribute(SketchPlugin_Arc::END_ID()));
 298     aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 299         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 300     aFeatInd = isReversed ? 0 : 1;
 301     anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
 302     aRefAttr->setAttr(aNewFeature[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
 303     recalculateAttributes(aNewArc, SketchPlugin_Arc::END_ID(), aNewFeature[aFeatInd], aFeatAttributes[anAttrInd]);
 304     aConstraint->execute();
 305     myProducedFeatures.push_back(aConstraint);
 306     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 307     // 2. Fillet arc radius
 308     //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
 309     //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 310     //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 311     //aRefAttr->setObject(aNewArc->lastResult());
 312     //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 313     //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
 314     //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 315     //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
 316     //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
 317     //aConstraint->execute();
 318     //myProducedFeatures.push_back(aConstraint);
 319     //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 320     // 3. Tangency of fillet arc and features
 321     for (int i = 0; i < aNbFeatures; i++) {
 322       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 323       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 324           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 325       aRefAttr->setObject(aNewArc->lastResult());
 326       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 327           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 328       bool isArc = aNewFeature[i]->getKind() == SketchPlugin_Arc::ID();
 329       aRefAttr->setObject(isArc ? aNewFeature[i]->lastResult() : aNewFeature[i]->firstResult());
 330       aConstraint->execute();
 331       myProducedFeatures.push_back(aConstraint);
 332       ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 333     }
 334     // 4. Coincidence of free boundaries of base and copied features
 335     for (int i = 0; i < aNbFeatures; i++) {
 336       anAttrInd = 2*i + (isStart[i] ? 1 : 0);
 337       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 338       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 339           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 340       aRefAttr->setAttr(aFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 341       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 342           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 343       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 344       myProducedFeatures.push_back(aConstraint);
 345     }
 346     // 5. Tangent points should be placed on the base features
 347     for (int i = 0; i < aNbFeatures; i++) {
 348       anAttrInd = 2*i + (isStart[i] ? 0 : 1);
 349       aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 350       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 351           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 352       aRefAttr->setAttr(aNewFeature[i]->attribute(aFeatAttributes[anAttrInd]));
 353       aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 354           aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 355       aRefAttr->setObject(aFeature[i]->lastResult());
 356       myProducedFeatures.push_back(aConstraint);
 357     }
 358     // make base features auxiliary
 359     anOldFeatureA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 360     anOldFeatureB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
 361     myBaseObjects.clear();
 362     myBaseObjects.push_back(anOldFeatureA);
 363     myBaseObjects.push_back(anOldFeatureB);
 364     // exchange the naming IDs of newly created and old line that become auxiliary
 365     sketch()->exchangeIDs(anOldFeatureA, aNewFeatureA);
 366     sketch()->exchangeIDs(anOldFeatureB, aNewFeatureB);
 367   } else {
 368     // Update radius value
 369     int aNbSubs = sketch()->numberOfSubs();
 370     FeaturePtr aSubFeature;
 371     for (int aSub = 0; aSub < aNbSubs; aSub++) {
 372       aSubFeature = sketch()->subFeature(aSub);
 373       if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
 374         continue;
 375       AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 376           aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 377       if (!aRefAttr || !aRefAttr->isObject())
 378         continue;
 379       FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
 380       if (aFeature == aNewArc) {
 381         AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 382           aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
 383         aRadius->setValue(aFilletRadius);
 384         break;
 385       }
 386     }
 387   }
 388
 389   // send events to update the sub-features by the solver
 390   if (isUpdateFlushed)
 391     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 392
 393   // the viewer update should be unblocked in order after the fillet features
 394   // are processed by the solver
 395   //aMsg = std::shared_ptr<Events_Message>(
 396   //              new Events_Message(Events_Loop::eventByName(EVENT_UPDATE_VIEWER_UNBLOCKED)));
 397   //Events_Loop::loop()->send(aMsg);
 398 }
 399
 400 void SketchPlugin_ConstraintFillet::attributeChanged(const std::string& theID)
 401 {
 402   if (theID == SketchPlugin_Constraint::ENTITY_A()) {
 403     // clear the list of fillet entities
 404     AttributeRefListPtr aRefListOfFillet = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 405         data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
 406     aRefListOfFillet->clear();
 407
 408     // clear the list of base features
 409     AttributeRefListPtr aRefListOfBaseLines = std::dynamic_pointer_cast<ModelAPI_AttributeRefList>(
 410         data()->attribute(SketchPlugin_Constraint::ENTITY_C()));
 411       aRefListOfBaseLines->clear();
 412
 413     // remove all produced objects and constraints
 414     DocumentPtr aDoc = sketch()->document();
 415     std::list<FeaturePtr>::iterator aCIt = myProducedFeatures.begin();
 416     for (; aCIt != myProducedFeatures.end(); ++aCIt)
 417       aDoc->removeFeature(*aCIt);
 418     myProducedFeatures.clear();
 419
 420     // clear auxiliary flag on initial objects
 421     for (aCIt = myBaseObjects.begin(); aCIt != myBaseObjects.end(); ++aCIt)
 422       (*aCIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
 423     myBaseObjects.clear();
 424
 425     // Obtain fillet point
 426     AttributeRefAttrPtr aBaseA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 427         data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
 428     if(!aBaseA->isInitialized() || aBaseA->isObject()) {
 429       return;
 430     }
 431     AttributePtr anAttrBaseA = aBaseA->attr();
 432     std::shared_ptr<GeomDataAPI_Point2D> aBasePoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrBaseA);
 433     if (!aBasePoint) {
 434       return;
 435     }
 436     std::shared_ptr<GeomAPI_Pnt2d> aFilletPoint = aBasePoint->pnt();
 437
 438     // Obtain conicident edges
 439     const std::set<AttributePtr>& aRefsList = anAttrBaseA->owner()->data()->refsToMe();
 440     std::set<AttributePtr>::const_iterator aIt;
 441     FeaturePtr aCoincident;
 442     for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
 443       std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
 444       FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
 445       if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 446         AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 447           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
 448         AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 449           aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
 450         if(anAttrRefA.get() && !anAttrRefA->isObject()) {
 451           AttributePtr anAttrA = anAttrRefA->attr();
 452           if(anAttrBaseA == anAttrA) {
 453             aCoincident = aConstrFeature;
 454             break;
 455           }
 456         }
 457         if(anAttrRefA.get() && !anAttrRefB->isObject()) {
 458           AttributePtr anAttrB = anAttrRefB->attr();
 459           if(anAttrBaseA == anAttrB) {
 460             aCoincident = aConstrFeature;
 461             break;
 462           }
 463         }
 464       }
 465     }
 466
 467     if(!aCoincident.get()) {
 468       setError("No coincident edges at selected vertex");
 469       return;
 470     }
 471
 472     std::set<FeaturePtr> aCoinsides;
 473     SketchPlugin_Tools::findCoincidences(aCoincident,
 474                                          SketchPlugin_ConstraintCoincidence::ENTITY_A(),
 475                                          aCoinsides);
 476     SketchPlugin_Tools::findCoincidences(aCoincident,
 477                                          SketchPlugin_ConstraintCoincidence::ENTITY_B(),
 478                                          aCoinsides);
 479
 480     // Remove points
 481     std::set<FeaturePtr> aNewLines;
 482     for(std::set<FeaturePtr>::iterator anIt = aCoinsides.begin(); anIt != aCoinsides.end(); ++anIt) {
 483       if((*anIt)->getKind() != SketchPlugin_Point::ID()) {
 484         aNewLines.insert(*anIt);
 485       }
 486     }
 487     aCoinsides = aNewLines;
 488
 489     // Remove auxilary lines
 490     if(aCoinsides.size() > 2) {
 491       aNewLines.clear();
 492       for(std::set<FeaturePtr>::iterator anIt = aCoinsides.begin(); anIt != aCoinsides.end(); ++anIt) {
 493         if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
 494           aNewLines.insert(*anIt);
 495         }
 496       }
 497       aCoinsides = aNewLines;
 498     }
 499
 500     if(aCoinsides.size() != 2) {
 501       setError("At selected vertex should be two coincident lines");
 502       return;
 503     }
 504
 505     // Store base lines
 506     FeaturePtr anOldFeatureA, anOldFeatureB;
 507     std::set<FeaturePtr>::iterator aLinesIt = aCoinsides.begin();
 508     anOldFeatureA = *aLinesIt++;
 509     anOldFeatureB = *aLinesIt;
 510     aRefListOfBaseLines->append(anOldFeatureA);
 511     aRefListOfBaseLines->append(anOldFeatureB);
 512
 513     // Getting points located at 1/3 of edge length from fillet point
 514     std::shared_ptr<GeomAPI_Pnt2d> aPntA, aPntB;
 515     getPointOnEdge(anOldFeatureA, aFilletPoint, aPntA);
 516     getPointOnEdge(anOldFeatureB, aFilletPoint, aPntB);
 517
 518     /// Getting distances
 519     double aRadius = 1;
 520     double aDistanceA = getProjectionDistance(anOldFeatureB, aPntA);
 521     double aDistanceB = getProjectionDistance(anOldFeatureA, aPntB);
 522     aRadius = aDistanceA < aDistanceB ? aDistanceA / 2.0 : aDistanceB / 2.0;
 523
 524     std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(data()->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aRadius);
 525   }
 526 }
 527
 528 AISObjectPtr SketchPlugin_ConstraintFillet::getAISObject(AISObjectPtr thePrevious)
 529 {
 530   if (!sketch())
 531     return thePrevious;
 532
 533   AISObjectPtr anAIS = thePrevious;
 534   /// TODO: Equal constraint presentation should be put here
 535   return anAIS;
 536 }
 537
 538 bool SketchPlugin_ConstraintFillet::isMacro() const
 539 {
 540   return true;
 541 }
 542
 543
 544 // =========   Auxiliary functions   =================
 545 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 546                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 547 {
 548   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 549       theNewArc->attribute(theNewArcAttribute))->pnt();
 550   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 551       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 552 }
 553
 554 /// \brief Find intersections of lines shifted along normal direction
 555 void possibleFilletCenterLineLine(
 556     std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
 557     std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
 558     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 559 {
 560   std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
 561   std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
 562   std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
 563   double aDet = theDirA->cross(theDirB);
 564   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 565     aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
 566     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 567       aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
 568       double aVX = aDirAT->xy()->dot(aPntA);
 569       double aVY = aDirBT->xy()->dot(aPntB);
 570       std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
 571           (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
 572           (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
 573       theCenters.push_back(aPoint);
 574     }
 575   }
 576 }
 577
 578 /// \brief Find intersections of line shifted along normal direction in both sides
 579 ///        and a circle with extended radius
 580 void possibleFilletCenterLineArc(
 581     std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
 582     std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
 583     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 584 {
 585   std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
 586   std::shared_ptr<GeomAPI_XY> aPnt;
 587   double aDirNorm2 = theDirLine->dot(theDirLine);
 588   double aRad = 0.0;
 589   double aDirX = theDirLine->x();
 590   double aDirX2 = theDirLine->x() * theDirLine->x();
 591   double aDirY2 = theDirLine->y() * theDirLine->y();
 592   double aDirXY = theDirLine->x() * theDirLine->y();
 593   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 594     aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
 595     double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
 596     double aCoeff2 = aCoeff * aCoeff;
 597     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 598       aRad = theRadiusArc + aStepB * theRadius;
 599       double aD = aRad * aRad * aDirNorm2 - aCoeff2;
 600       if (aD < 0.0)
 601         continue;
 602       double aDs = sqrt(aD);
 603       double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
 604       double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
 605       double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 606           aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
 607       double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
 608           aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
 609
 610       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 611       theCenters.push_back(aPoint1);
 612       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 613       theCenters.push_back(aPoint2);
 614     }
 615   }
 616 }
 617
 618 /// \brief Find intersections of two circles with extended radii
 619 void possibleFilletCenterArcArc(
 620     std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
 621     std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
 622     double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
 623 {
 624   std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
 625   double aCenterDist2 = aCenterDir->dot(aCenterDir);
 626   double aCenterDist = sqrt(aCenterDist2);
 627
 628   double aRadA, aRadB;
 629   for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
 630     aRadA = theRadiusA + aStepA * theRadius;
 631     for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
 632       aRadB = theRadiusB + aStepB * theRadius;
 633       if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
 634         continue; // there is no intersections
 635
 636       double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
 637       double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
 638
 639       double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
 640       double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
 641
 642       double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
 643       double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
 644
 645       std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
 646       theCenters.push_back(aPoint1);
 647       std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
 648       theCenters.push_back(aPoint2);
 649     }
 650   }
 651 }
 652
 653 void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
 654                            double theRadius, bool theNotInversed[2],
 655                            std::shared_ptr<GeomAPI_XY>& theCenter,
 656                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 657                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 658 {
 659   static const int aNbFeatures = 2;
 660   FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
 661   std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
 662   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
 663
 664   for (int i = 0; i < aNbFeatures; i++) {
 665     if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
 666       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 667           aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
 668       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 669           aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
 670     } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
 671       aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 672           aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
 673       aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 674           aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
 675       aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 676           aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
 677     } else
 678       return;
 679     aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 680         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
 681         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
 682     aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
 683         new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
 684         new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
 685   }
 686
 687   if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 688       theFeatureB->getKind() == SketchPlugin_Line::ID()) {
 689     std::shared_ptr<GeomAPI_Dir2d> aDir[2];
 690     std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
 691     for (int i = 0; i < aNbFeatures; i++) {
 692       aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
 693       aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
 694     }
 695
 696     // get and filter possible centers
 697     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 698     possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
 699     double aDot = 0.0;
 700     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 701     for (; anIt != aSuspectCenters.end(); anIt++) {
 702       aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
 703       theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
 704       if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
 705         continue; // incorrect position
 706       aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
 707       theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
 708       if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
 709         continue; // incorrect position
 710       // the center is found, stop searching
 711       theCenter = *anIt;
 712       return;
 713     }
 714   } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 715       theFeatureB->getKind() == SketchPlugin_Line::ID()) ||
 716       (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
 717       theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
 718     int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
 719     double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
 720     std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
 721         new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
 722     std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
 723         new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
 724
 725     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 726         new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 727     std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 728         new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
 729     double anArcAngle = aEndArcDir->angle(aStartArcDir);
 730
 731     // get possible centers and filter them
 732     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 733     possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
 734     double aDot = 0.0;
 735     // the line is forward into the arc
 736     double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
 737     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 738     // The possible centers are ranged by their positions.
 739     // If the point is not satisfy one of criteria, the weight is decreased with penalty.
 740     int aBestWeight = 0;
 741     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 742     for (; anIt != aSuspectCenters.end(); anIt++) {
 743       int aWeight = 2;
 744       aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
 745       aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
 746       // Check the point is placed on the correct arc (penalty if false)
 747       if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
 748         aWeight -= 1;
 749       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 750           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
 751       double aCurAngle = aCurDir->angle(aStartArcDir);
 752       if (anArcAngle < 0.0) aCurAngle *= -1.0;
 753       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
 754         continue;
 755       if (aWeight > aBestWeight)
 756         aBestWeight = aWeight;
 757       else if (aWeight < aBestWeight ||
 758                aStart[aLineInd]->distance(*anIt) >
 759                aStart[aLineInd]->distance(theCenter)) // <-- take closer point
 760         continue;
 761       // the center is found, stop searching
 762       theCenter = *anIt;
 763       anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
 764       if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
 765         theTangentA = aLineTgPoint;
 766         theTangentB = anArcTgPoint;
 767       } else {
 768         theTangentA = anArcTgPoint;
 769         theTangentB = aLineTgPoint;
 770       }
 771       //return;
 772     }
 773   } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
 774       theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
 775     double anArcRadius[aNbFeatures];
 776     double anArcAngle[aNbFeatures];
 777     std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
 778     for (int i = 0; i < aNbFeatures; i++) {
 779       anArcRadius[i] = aStart[i]->distance(aCenter[i]);
 780       aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
 781           new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
 782       std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
 783           new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
 784       anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
 785     }
 786
 787     // get and filter possible centers
 788     std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
 789     possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
 790     double aDot = 0.0;
 791     std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
 792     std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
 793     for (; anIt != aSuspectCenters.end(); anIt++) {
 794       std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
 795           new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
 796       double aCurAngle = aCurDir->angle(aStartArcDir[0]);
 797       if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
 798       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
 799         continue; // incorrect position
 800       theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
 801
 802       aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
 803       aCurAngle = aCurDir->angle(aStartArcDir[1]);
 804       if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
 805       if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
 806         continue; // incorrect position
 807       theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
 808
 809       // the center is found, stop searching
 810       theCenter = *anIt;
 811       return;
 812     }
 813   }
 814 }
 815
 816 void getPointOnEdge(const FeaturePtr theFeature,
 817                     const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
 818                     std::shared_ptr<GeomAPI_Pnt2d>& thePoint) {
 819   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 820     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 821       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 822     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 823       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 824     if(aPntStart->distance(theFilletPoint) > 1.e-7) {
 825       aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 826         theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 827       aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 828         theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 829     }
 830     thePoint.reset( new GeomAPI_Pnt2d(aPntStart->xy()->added( aPntEnd->xy()->decreased( aPntStart->xy() )->multiplied(1.0 / 3.0) ) ) );
 831   } else {
 832     std::shared_ptr<GeomAPI_Pnt2d> aPntTemp;
 833     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 834       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 835     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 836       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 837     if(theFeature->attribute(SketchPlugin_Arc::INVERSED_ID())) {
 838       aPntTemp = aPntStart;
 839       aPntStart = aPntEnd;
 840       aPntEnd = aPntTemp;
 841     }
 842     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 843       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 844     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 845     double aStartParameter(0), anEndParameter(0);
 846     aCirc->parameter(aPntStart, paramTolerance, aStartParameter);
 847     aCirc->parameter(aPntEnd, paramTolerance, anEndParameter);
 848     if(aPntStart->distance(theFilletPoint) > tolerance) {
 849       double aTmpParameter = aStartParameter;
 850       aStartParameter = anEndParameter;
 851       anEndParameter = aTmpParameter;
 852     }
 853     double aPntParameter = aStartParameter + (anEndParameter - aStartParameter) / 3.0;
 854     aCirc->D0(aPntParameter, thePoint);
 855   }
 856 }
 857
 858 double getProjectionDistance(const FeaturePtr theFeature,
 859                              const std::shared_ptr<GeomAPI_Pnt2d> thePoint)
 860 {
 861   std::shared_ptr<GeomAPI_Pnt2d> aProjectPnt;
 862   if(theFeature->getKind() == SketchPlugin_Line::ID()) {
 863     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 864       theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
 865     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 866       theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
 867     std::shared_ptr<GeomAPI_Lin2d> aLin(new GeomAPI_Lin2d(aPntStart, aPntEnd));
 868     aProjectPnt = aLin->project(thePoint);
 869   } else {
 870     std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 871       theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
 872     std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 873       theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
 874     std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 875       theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 876     std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
 877     aProjectPnt = aCirc->project(thePoint);
 878   }
 879   if(aProjectPnt.get()) {
 880     return aProjectPnt->distance(thePoint);
 881   }
 882   return -1;
 883 }