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Fix for the issue #1928
[modules/shaper.git] / src / SketchPlugin / SketchPlugin_ConstraintSplit.cpp
index 5c0db4bda179cbc3f71cb2b0ac4f64584b380a9d..ccf819ab626e340bb18825946e1a40a6387a9e3d 100755 (executable)
@@ -1,75 +1,56 @@
 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D -->
 
 // File:    SketchPlugin_ConstraintSplit.cpp
-// Created: 17 Jul 2016
+// Created: 25 Aug 2016
 // Author:  Natalia ERMOLAEVA
 
 #include "SketchPlugin_ConstraintSplit.h"
 
-//#include <GeomAPI_Circ2d.h>
-//#include <GeomAPI_Dir2d.h>
-//#include <GeomAPI_Lin2d.h>
+#include <GeomAPI_Dir2d.h>
 #include <GeomAPI_Pnt2d.h>
-//#include <GeomAPI_XY.h>
+#include <GeomAPI_XY.h>
 #include <GeomDataAPI_Point2D.h>
-//#include <ModelAPI_AttributeDouble.h>
+#include <GeomAlgoAPI_ShapeTools.h>
+
 #include <ModelAPI_AttributeReference.h>
 #include <ModelAPI_AttributeString.h>
-//#include <ModelAPI_AttributeRefList.h>
 #include <ModelAPI_AttributeRefAttr.h>
+#include <ModelAPI_Tools.h>
+
+#include <ModelAPI_Validator.h>
+#include <ModelAPI_Session.h>
+#include <ModelAPI_AttributeDouble.h>
 
 #include <SketchPlugin_Line.h>
 #include <SketchPlugin_Arc.h>
+#include <SketchPlugin_Circle.h>
+#include <SketchPlugin_ConstraintCoincidence.h>
+#include <SketchPlugin_ConstraintEqual.h>
+#include <SketchPlugin_ConstraintParallel.h>
+#include <SketchPlugin_ConstraintTangent.h>
+#include <SketchPlugin_ConstraintLength.h>
+#include <SketchPlugin_ConstraintMirror.h>
+#include <SketchPlugin_MultiRotation.h>
+#include <SketchPlugin_MultiTranslation.h>
+
+#include <ModelAPI_Events.h>
+#include <SketchPlugin_Line.h>
+#include <SketchPlugin_Arc.h>
+#include <SketchPlugin_Circle.h>
+
+#include <ModelGeomAlgo_Point2D.h>
+#include <Events_Loop.h>
 
-//#include <ModelAPI_Data.h>
-//#include <ModelAPI_Events.h>
-//#include <ModelAPI_Session.h>
-//#include <ModelAPI_Validator.h>
-//
-//#include <SketchPlugin_Arc.h>
-//#include <SketchPlugin_Line.h>
-//#include <SketchPlugin_Point.h>
-//#include <SketchPlugin_Sketch.h>
-//#include <SketchPlugin_ConstraintCoincidence.h>
-//#include <SketchPlugin_ConstraintTangent.h>
-//#include <SketchPlugin_ConstraintRadius.h>
-//#include <SketchPlugin_Tools.h>
-//
-//#include <Events_Loop.h>
-//
-//#include <math.h>
-//
-//const double tolerance = 1.e-7;
-//const double paramTolerance = 1.e-4;
-
-///// \brief Attract specified point on theNewArc to the attribute of theFeature
-//static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
-//  FeaturePtr theFeature, const std::string& theFeatureAttribute);
-//
-///// \brief Calculates center of fillet arc and coordinates of tangency points
-//static void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
-//                                  double theRadius, bool theNotInversed[2],
-//                                  std::shared_ptr<GeomAPI_XY>& theCenter,
-//                                  std::shared_ptr<GeomAPI_XY>& theTangentA,
-//                                  std::shared_ptr<GeomAPI_XY>& theTangentB);
-//
-///// Get point on 1/3 length of edge from fillet point
-//static void getPointOnEdge(const FeaturePtr theFeature,
-//                           const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
-//                           std::shared_ptr<GeomAPI_Pnt2d>& thePoint);
-//
-///// Get distance from point to feature
-//static double getProjectionDistance(const FeaturePtr theFeature,
-//                             const std::shared_ptr<GeomAPI_Pnt2d> thePoint);
-//
-///// Get coincide edges for fillet
-//static std::set<FeaturePtr> getCoincides(const FeaturePtr& theConstraintCoincidence);
+#include <cmath>
+
+//#define DEBUG_SPLIT
+#ifdef DEBUG_SPLIT
+#include <iostream>
+#endif
+
+static const double PI = 3.141592653589793238463;
 
 SketchPlugin_ConstraintSplit::SketchPlugin_ConstraintSplit()
-//: myListOfPointsChangedInCode(false),
-//  myRadiusChangedByUser(false),
-//  myRadiusChangedInCode(false),
-//  myRadiusInitialized(false)
 {
 }
 
@@ -78,9 +59,6 @@ void SketchPlugin_ConstraintSplit::initAttributes()
   data()->addAttribute(SketchPlugin_Constraint::VALUE(), ModelAPI_AttributeReference::typeId());
   data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefAttr::typeId());
   data()->addAttribute(SketchPlugin_Constraint::ENTITY_B(), ModelAPI_AttributeRefAttr::typeId());
-
-  //data()->addAttribute(SketchPlugin_Constraint::VALUE(), ModelAPI_AttributeDouble::typeId());
-  //data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefAttrList::typeId());
 }
 
 void SketchPlugin_ConstraintSplit::execute()
@@ -89,1112 +67,1302 @@ void SketchPlugin_ConstraintSplit::execute()
 
   // Check the base objects are initialized.
   AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
-                                            aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
+                                            aData->attribute(SketchPlugin_Constraint::VALUE()));
   if(!aBaseObjectAttr->isInitialized()) {
     setError("Error: Base object is not initialized.");
     return;
   }
-  AttributePoint2DPtr aFirstPointAttr = getPointOfRefAttr(aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
-  AttributePoint2DPtr aLastPointAttr = getPointOfRefAttr(aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
-  if (!aFirstPointAttr.get() || !aFirstPointAttr->isInitialized() ||
-      !aLastPointAttr.get() || !aLastPointAttr->isInitialized()) {
+  AttributePoint2DPtr aFirstPointAttrOfSplit =
+    getPointOfRefAttr(aData->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  AttributePoint2DPtr aSecondPointAttrOfSplit =
+    getPointOfRefAttr(aData->attribute(SketchPlugin_Constraint::ENTITY_B()));
+  if (!aFirstPointAttrOfSplit.get() || !aFirstPointAttrOfSplit->isInitialized() ||
+      !aSecondPointAttrOfSplit.get() || !aSecondPointAttrOfSplit->isInitialized()) {
     setError("Error: Sub-shape is not initialized.");
     return;
   }
 
-  AttributePoint2DPtr aStartPointAttr = getFeaturePoint(true);
-  AttributePoint2DPtr anEndPointAttr = getFeaturePoint(false);
-  if (!aStartPointAttr.get() && !anEndPointAttr.get()) {
-    setError("Error: Circle is not processed."); /// TODO
-    return;
-  }
-
-  /// if first point is closer to last point, wrap first and last values
-  if (aStartPointAttr->pnt()->distance(aFirstPointAttr->pnt()) >
-      anEndPointAttr->pnt()->distance(aLastPointAttr->pnt())) {
-    AttributePoint2DPtr aTmpPoint = aFirstPointAttr;
-    aFirstPointAttr = aLastPointAttr;
-    aLastPointAttr = aTmpPoint;
-  }
-  FeaturePtr aSplitFeature = createFeature(aFirstPointAttr, aLastPointAttr);
-
-  std::set<FeaturePtr> aLeftFeatures;
-  if (!aStartPointAttr->pnt()->isEqual(aFirstPointAttr->pnt()))
-    aLeftFeatures.insert(createFeature(aStartPointAttr, aFirstPointAttr));
-  if (!aLastPointAttr->pnt()->isEqual(anEndPointAttr->pnt()))
-    aLeftFeatures.insert(createFeature(aLastPointAttr, anEndPointAttr));
-
-  /*
-  // Get fillet radius.
-  double aFilletRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
-    aData->attribute(SketchPlugin_Constraint::VALUE()))->value();
-
   // Wait all constraints being created, then send update events
   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
   if (isUpdateFlushed)
     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 
-  for(std::set<AttributePtr>::iterator aPointsIter = myNewPoints.begin();
-      aPointsIter != myNewPoints.end();
-      ++aPointsIter) {
-    AttributePtr aPointAttr = *aPointsIter;
-    std::shared_ptr<GeomDataAPI_Point2D> aFilletPoint2d = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aPointAttr);
-    if(!aFilletPoint2d.get()) {
-      setError("Error: One of the selected points is empty.");
-      return;
-    }
-    std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt2d = aFilletPoint2d->pnt();
-
-    // Obtain base lines for fillet.
-    bool anIsNeedNewObjects = true;
-    FilletFeatures aFilletFeatures;
-    std::map<AttributePtr, FilletFeatures>::iterator aPrevPointsIter = myPointFeaturesMap.find(aPointAttr);
-    if(aPrevPointsIter != myPointFeaturesMap.end()) {
-      anIsNeedNewObjects = false;
-      aFilletFeatures = aPrevPointsIter->second;
-    }
-    FeaturePtr aBaseEdgeA, aBaseEdgeB;
-    if(!anIsNeedNewObjects) {
-      aBaseEdgeA = aFilletFeatures.baseEdgesState.front().first;
-      aBaseEdgeB = aFilletFeatures.baseEdgesState.back().first;
-    } else {
-      // Obtain constraint coincidence for the fillet point.
-      FeaturePtr aConstraintCoincidence;
-      const std::set<AttributePtr>& aRefsList = aFilletPoint2d->owner()->data()->refsToMe();
-      for(std::set<AttributePtr>::const_iterator anIt = aRefsList.cbegin(); anIt != aRefsList.cend(); ++anIt) {
-        std::shared_ptr<ModelAPI_Attribute> anAttr = (*anIt);
-        FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
-        if(aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
-          AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
-          AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
-          if(anAttrRefA.get() && !anAttrRefA->isObject()) {
-            AttributePtr anAttrA = anAttrRefA->attr();
-            if(aFilletPoint2d == anAttrA) {
-              aConstraintCoincidence = aConstrFeature;
-              break;
-            }
-          }
-          if(anAttrRefB.get() && !anAttrRefB->isObject()) {
-            AttributePtr anAttrB = anAttrRefB->attr();
-            if(aFilletPoint2d == anAttrB) {
-              aConstraintCoincidence = aConstrFeature;
-              break;
-            }
-          }
-        }
-      }
 
-      if(!aConstraintCoincidence.get()) {
-        setError("Error: No coincident edges at one of the selected points.");
-        return;
-      }
+  // Find feature constraints
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  ResultPtr aBaseFeatureResult = getFeatureResult(aBaseFeature);
+  std::set<FeaturePtr> aFeaturesToDelete, aFeaturesToUpdate;
 
-      // Get coincide edges.
-      std::set<FeaturePtr> aCoincides = getCoincides(aConstraintCoincidence);
-      if(aCoincides.size() != 2) {
-        setError("Error: One of the selected points does not have two suitable edges for fillet.");
-        return;
-      }
+  std::map<FeaturePtr, IdToPointPair> aTangentFeatures;
+  std::map<FeaturePtr, IdToPointPair> aCoincidenceToFeature;
+  getConstraints(aFeaturesToDelete, aFeaturesToUpdate, aTangentFeatures, aCoincidenceToFeature);
 
-      std::set<FeaturePtr>::iterator aLinesIt = aCoincides.begin();
-      aBaseEdgeA = *aLinesIt++;
-      aBaseEdgeB = *aLinesIt;
+  std::map<AttributePtr, std::list<AttributePtr> > aBaseRefAttributes;
+  std::list<AttributePtr> aRefsToFeature;
+  getRefAttributes(aBaseFeature, aBaseRefAttributes, aRefsToFeature);
 
-      std::pair<FeaturePtr, bool> aBasePairA = std::make_pair(aBaseEdgeA, aBaseEdgeA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value());
-      std::pair<FeaturePtr, bool> aBasePairB = std::make_pair(aBaseEdgeB, aBaseEdgeB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value());
-      aFilletFeatures.baseEdgesState.push_back(aBasePairA);
-      aFilletFeatures.baseEdgesState.push_back(aBasePairB);
-    }
+  std::map<AttributePtr, AttributePtr> aBasePointModifiedAttributes;
 
-    if(!aBaseEdgeA.get() || !aBaseEdgeB.get()) {
-      setError("Error: One of the base edges is empty.");
-      return;
-    }
+#ifdef DEBUG_SPLIT
+  std::cout << std::endl;
+  std::cout << "SketchPlugin_ConstraintSplit::execute()" << std::endl;
+  std::cout << std::endl;
 
-    // Create new edges and arc if needed.
-    FeaturePtr aResultEdgeA, aResultEdgeB, aResultArc;
-    if(!anIsNeedNewObjects) {
-      // Obtain features from the list.
-      std::list<FeaturePtr>::iterator aResultEdgesIt = aFilletFeatures.resultEdges.begin();
-      aResultEdgeA = *aResultEdgesIt++;
-      aResultEdgeB = *aResultEdgesIt++;
-      aResultArc = *aResultEdgesIt;
-    } else {
-      // Copy edges and create arc.
-      aResultEdgeA = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(aBaseEdgeA, sketch());
-      aResultEdgeA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
-      aResultEdgeB = SketchPlugin_Sketch::addUniqueNamedCopiedFeature(aBaseEdgeB, sketch());
-      aResultEdgeB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(false);
-      aResultArc = sketch()->addFeature(SketchPlugin_Arc::ID());
-
-      aFilletFeatures.resultEdges.push_back(aResultEdgeA);
-      aFilletFeatures.resultEdges.push_back(aResultEdgeB);
-      aFilletFeatures.resultEdges.push_back(aResultArc);
-    }
+  SketchPlugin_Sketch* aSketch = sketch();
+  std::cout << "SKETCH FEATURES (before split) [" << aSketch->numberOfSubs() << "]:" << std::endl;
+  for (int i = 0, aNbSubs = aSketch->numberOfSubs(); i < aNbSubs; i++) {
+    std::cout << getFeatureInfo(aSketch->subFeature(i), false) << std::endl;
+  }
 
-    // Calculate arc attributes
-    static const int aNbFeatures = 2;
-    FeaturePtr aBaseFeatures[aNbFeatures] = {aBaseEdgeA, aBaseEdgeB};
-    FeaturePtr aResultFeatures[aNbFeatures] = {aResultEdgeA, aResultEdgeB};
-    std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures]; // tangent directions of the features in coincident point
-    bool isStart[aNbFeatures]; // indicates which point the features share
-    std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2]; // first pair of points relate to first feature, second pair -  to second
-    std::string aFeatAttributes[aNbFeatures * 2]; // attributes of features
-    for (int i = 0; i < aNbFeatures; i++) {
-      std::string aStartAttr, aEndAttr;
-      if (aResultFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
-        aStartAttr = SketchPlugin_Line::START_ID();
-        aEndAttr = SketchPlugin_Line::END_ID();
-      } else if (aResultFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
-        aStartAttr = SketchPlugin_Arc::START_ID();
-        aEndAttr = SketchPlugin_Arc::END_ID();
-      } else { // wrong argument
-        setError("Error: One of the points has wrong coincide feature");
-        return;
-      }
-      aFeatAttributes[2*i] = aStartAttr;
-      aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-        aBaseFeatures[i]->attribute(aStartAttr))->pnt();
-      aFeatAttributes[2*i+1] = aEndAttr;
-      aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-        aBaseFeatures[i]->attribute(aEndAttr))->pnt();
-    }
-    for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
-      for (int j = 0; j < 2; j++) // loop on start-end of each feature
-        if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPnt2d) < 1.e-10) {
-          isStart[aFeatInd] = (j==0);
-          break;
-        }
-    }
-    // tangent directions of the features
-    for (int i = 0; i < aNbFeatures; i++) {
-      std::shared_ptr<GeomAPI_XY> aDir;
-      if (aResultFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
-        aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
-        if (!isStart[i])
-          aDir = aDir->multiplied(-1.0);
-      } else if (aResultFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
-        std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aResultFeatures[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
-        aDir = isStart[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
-        aDir = aDir->decreased(aCenterPoint->xy());
-
-        double x = aDir->x();
-        double y = aDir->y();
-        aDir->setX(-y);
-        aDir->setY(x);
-        if (isStart[i] == std::dynamic_pointer_cast<SketchPlugin_Arc>(aBaseFeatures[i])->isReversed())
-          aDir = aDir->multiplied(-1.0);
-      }
-      aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
+  std::cout << std::endl;
+  std::cout << "---- IN PARAMETERS ----" << std::endl;
+  std::cout << "Base feature:" << getFeatureInfo(aBaseFeature) << std::endl;
+  std::cout << std::endl;
+
+  if (!aCoincidenceToFeature.empty()) {
+    std::cout << "Coincidences to base feature[" <<
+      aCoincidenceToFeature.size() << "]: " << std::endl;
+    std::map<FeaturePtr, IdToPointPair>::const_iterator anIt = aCoincidenceToFeature.begin(),
+                                                        aLast = aCoincidenceToFeature.end();
+    for (int i = 1; anIt != aLast; anIt++, i++) {
+      FeaturePtr aFeature = (*anIt).first;
+      std::string anAttributeId = (*anIt).second.first;
+      std::shared_ptr<GeomDataAPI_Point2D> aPointAttr = (*anIt).second.second;
+
+      std::cout << i << "-" << getFeatureInfo(aFeature) << std::endl;
+      std::cout <<     " -Attribute to correct:" << anAttributeId << std::endl;
+      std::cout <<     " -Point attribute:" <<
+        ModelGeomAlgo_Point2D::getPointAttributeInfo(aPointAttr) << std::endl;
     }
+  }
 
-    // By default, the start point of fillet arc is connected to FeatureA,
-    // and the end point - to FeatureB. But when the angle between TangentDirA and
-    // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
-    double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A), where A and B - angles between corresponding tanget direction and the X axis
-    bool isReversed = cosBA > 0.0;
-
-    // Calculate fillet arc parameters
-    std::shared_ptr<GeomAPI_XY> aCenter, aTangentPntA, aTangentPntB;
-    calculateFilletCenter(aBaseEdgeA, aBaseEdgeB, aFilletRadius, isStart, aCenter, aTangentPntA, aTangentPntB);
-    if(!aCenter.get() || !aTangentPntA.get() || !aTangentPntB.get()) {
-      setError("Can not create fillet with the specified parameters.");
-      return;
+  if (!aTangentFeatures.empty()) {
+    std::cout << std::endl;
+    std::cout << "Tangencies to base feature[" << aTangentFeatures.size() << "]: " << std::endl;
+    std::map<FeaturePtr, IdToPointPair>::const_iterator anIt = aTangentFeatures.begin(),
+                                                        aLast = aTangentFeatures.end();
+    for (int i = 1; anIt != aLast; anIt++, i++) {
+      FeaturePtr aFeature = (*anIt).first;
+      std::string anAttributeId = (*anIt).second.first;
+      std::shared_ptr<GeomDataAPI_Point2D> aPointAttr = (*anIt).second.second;
+
+      std::cout << i << "-" << getFeatureInfo(aFeature) << std::endl;
+      std::cout <<     " -Attribute to correct:" << anAttributeId << std::endl;
+      std::cout <<     " -Point attribute:" <<
+        ModelGeomAlgo_Point2D::getPointAttributeInfo(aPointAttr) << std::endl;
     }
-    // update features
-    std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      aResultEdgeA->attribute(aFeatAttributes[isStart[0] ? 0 : 1]))->setValue(aTangentPntA->x(), aTangentPntA->y());
-    aResultEdgeA->execute();
-    std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      aResultEdgeB->attribute(aFeatAttributes[2 + (isStart[1] ? 0 : 1)]))->setValue(aTangentPntB->x(), aTangentPntB->y());
-    aResultEdgeB->execute();
-    // update fillet arc: make the arc correct for sure, so, it is not needed to process the "attribute updated"
-    // by arc; moreover, it may cause cyclicity in hte mechanism of updater
-    aResultArc->data()->blockSendAttributeUpdated(true);
-    std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      aResultArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(aCenter->x(), aCenter->y());
-    if(isReversed) {
-      std::shared_ptr<GeomAPI_XY> aTmp = aTangentPntA;
-      aTangentPntA = aTangentPntB;
-      aTangentPntB = aTmp;
-    }
-    std::shared_ptr<GeomDataAPI_Point2D> aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      aResultArc->attribute(SketchPlugin_Arc::START_ID()));
-    std::shared_ptr<GeomDataAPI_Point2D> aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      aResultArc->attribute(SketchPlugin_Arc::END_ID()));
-    if(aStartPoint->isInitialized() && aEndPoint->isInitialized() &&
-      (aStartPoint->pnt()->xy()->distance(aTangentPntA) > tolerance ||
-       aEndPoint->pnt()->xy()->distance(aTangentPntB) > tolerance)) {
-      std::dynamic_pointer_cast<SketchPlugin_Arc>(aResultArc)->setReversed(false);
-    }
-    aStartPoint->setValue(aTangentPntA->x(), aTangentPntA->y());
-    aEndPoint->setValue(aTangentPntB->x(), aTangentPntB->y());
-    aResultArc->data()->blockSendAttributeUpdated(false);
-    aResultArc->execute();
-
-    if(anIsNeedNewObjects) {
-      // Create list of additional constraints:
-      // 1. Coincidence of boundary points of features (copied lines/arcs) and fillet arc
-      // 1.1. coincidence
-      FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
-      AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-          aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-      aRefAttr->setAttr(aResultArc->attribute(SketchPlugin_Arc::START_ID()));
-      aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-          aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-      int aFeatInd = isReversed ? 1 : 0;
-      int anAttrInd = (isReversed ? 2 : 0) + (isStart[isReversed ? 1 : 0] ? 0 : 1);
-      aRefAttr->setAttr(aResultFeatures[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
-      recalculateAttributes(aResultArc, SketchPlugin_Arc::START_ID(), aResultFeatures[aFeatInd], aFeatAttributes[anAttrInd]);
-      aConstraint->execute();
-      aFilletFeatures.resultConstraints.push_back(aConstraint);
-      ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
-      // 1.2. coincidence
-      aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
-      aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-          aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-      aRefAttr->setAttr(aResultArc->attribute(SketchPlugin_Arc::END_ID()));
-      aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-          aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-      aFeatInd = isReversed ? 0 : 1;
-      anAttrInd = (isReversed ? 0 : 2) + (isStart[isReversed ? 0 : 1] ? 0 : 1);
-      aRefAttr->setAttr(aResultFeatures[aFeatInd]->attribute(aFeatAttributes[anAttrInd]));
-      recalculateAttributes(aResultArc, SketchPlugin_Arc::END_ID(), aResultFeatures[aFeatInd], aFeatAttributes[anAttrInd]);
-      aConstraint->execute();
-      aFilletFeatures.resultConstraints.push_back(aConstraint);
-      ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
-      // 2. Fillet arc radius
-      //aConstraint = sketch()->addFeature(SketchPlugin_ConstraintRadius::ID());
-      //aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-      //    aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-      //aRefAttr->setObject(aNewArc->lastResult());
-      //std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
-      //    aConstraint->attribute(SketchPlugin_Constraint::VALUE()))->setValue(aFilletRadius);
-      //std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      //    aConstraint->attribute(SketchPlugin_Constraint::FLYOUT_VALUE_PNT()))->setValue(
-      //    isStart[0] ? aStartEndPnt[0] : aStartEndPnt[1]);
-      //aConstraint->execute();
-      //myProducedFeatures.push_back(aConstraint);
-      //ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
-      // 3. Tangency of fillet arc and features
-      for (int i = 0; i < aNbFeatures; i++) {
-        aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-        aRefAttr->setObject(aResultArc->lastResult());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-        bool isArc = aResultFeatures[i]->getKind() == SketchPlugin_Arc::ID();
-        aRefAttr->setObject(isArc ? aResultFeatures[i]->lastResult() : aResultFeatures[i]->firstResult());
-        aConstraint->execute();
-        aFilletFeatures.resultConstraints.push_back(aConstraint);
-        ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
-      }
-      // 4. Coincidence of free boundaries of base and copied features
-      for (int i = 0; i < aNbFeatures; i++) {
-        anAttrInd = 2*i + (isStart[i] ? 1 : 0);
-        aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-        aRefAttr->setAttr(aBaseFeatures[i]->attribute(aFeatAttributes[anAttrInd]));
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-        aRefAttr->setAttr(aResultFeatures[i]->attribute(aFeatAttributes[anAttrInd]));
-        aFilletFeatures.resultConstraints.push_back(aConstraint);
-      }
-      // 4.1. Additional tangency constraints when the fillet is based on arcs.
-      //      It is used to verify the created arc will be placed on a source.
-      for (int i = 0; i < aNbFeatures; ++i) {
-        if (aResultFeatures[i]->getKind() != SketchPlugin_Arc::ID())
-          continue;
-        aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-        aRefAttr->setObject(aBaseFeatures[i]->lastResult());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-        aRefAttr->setObject(aResultFeatures[i]->lastResult());
-        aConstraint->execute();
-        aFilletFeatures.resultConstraints.push_back(aConstraint);
-        ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
-      }
-      // 5. Tangent points should be placed on the base features
-      for (int i = 0; i < aNbFeatures; i++) {
-        anAttrInd = 2*i + (isStart[i] ? 0 : 1);
-        aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
-        aRefAttr->setAttr(aResultFeatures[i]->attribute(aFeatAttributes[anAttrInd]));
-        aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
-        aRefAttr->setObject(aBaseFeatures[i]->lastResult());
-        aFilletFeatures.resultConstraints.push_back(aConstraint);
-      }
-      // make base features auxiliary
-      aBaseEdgeA->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
-      aBaseEdgeB->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(true);
-
-      // exchange the naming IDs of newly created and old line that become auxiliary
-      sketch()->exchangeIDs(aBaseEdgeA, aResultEdgeA);
-      sketch()->exchangeIDs(aBaseEdgeB, aResultEdgeB);
-
-      // store point and features in the map.
-      myPointFeaturesMap[aPointAttr] = aFilletFeatures;
-    } else {
-      // Update radius value
-      int aNbSubs = sketch()->numberOfSubs();
-      FeaturePtr aSubFeature;
-      for (int aSub = 0; aSub < aNbSubs; aSub++) {
-        aSubFeature = sketch()->subFeature(aSub);
-        if (aSubFeature->getKind() != SketchPlugin_ConstraintRadius::ID())
-          continue;
-        AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aSubFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
-        if (!aRefAttr || !aRefAttr->isObject())
-          continue;
-        FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
-        if (aFeature == aResultArc) {
-          AttributeDoublePtr aRadius = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
-            aSubFeature->attribute(SketchPlugin_Constraint::VALUE()));
-          aRadius->setValue(aFilletRadius);
-          break;
-        }
-      }
+  }
+
+  std::map<AttributePtr, std::list<AttributePtr> >::const_iterator
+    aRefIt = aBaseRefAttributes.begin(), aRefLast = aBaseRefAttributes.end();
+  std::cout << std::endl << "References to attributes of base feature [" <<
+    aBaseRefAttributes.size() << "]" << std::endl;
+  for (; aRefIt != aRefLast; aRefIt++) {
+    AttributePtr aBaseAttr = aRefIt->first;
+    std::list<AttributePtr> aRefAttributes = aRefIt->second;
+    std::string aRefsInfo;
+    std::list<AttributePtr>::const_iterator aRefAttrIt = aRefAttributes.begin(),
+                                            aRefAttrLast = aRefAttributes.end();
+    for (; aRefAttrIt != aRefAttrLast; aRefAttrIt++) {
+      if (!aRefsInfo.empty())
+        aRefsInfo.append(",");
+      AttributePtr aRAttr = *aRefAttrIt;
+      aRefsInfo.append(aRAttr->id());
+      FeaturePtr aRFeature = ModelAPI_Feature::feature(aRAttr->owner());
+      aRefsInfo.append("(" + aRFeature->name() + ") ");
     }
+    std::shared_ptr<GeomDataAPI_Point2D> aPointAttr =
+      std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aBaseAttr);
+    std::cout << aPointAttr->id().c_str() <<
+      ": " << "[" << aRefAttributes.size() << "] " << aRefsInfo << std::endl;
+  }
+  std::cout << std::endl;
+  std::cout << std::endl << "References to base feature [" <<
+    aRefsToFeature.size() << "]" << std::endl;
+  std::list<AttributePtr>::const_iterator aRefAttrIt = aRefsToFeature.begin(),
+                                          aRefAttrLast = aRefsToFeature.end();
+  std::string aRefsInfo;
+  for (; aRefAttrIt != aRefAttrLast; aRefAttrIt++) {
+    if (!aRefsInfo.empty())
+      aRefsInfo.append(",");
+    AttributePtr aRAttr = *aRefAttrIt;
+    aRefsInfo.append(aRAttr->id());
+    FeaturePtr aRFeature = ModelAPI_Feature::feature(aRAttr->owner());
+    aRefsInfo.append("(" + aRFeature->name() + ") ");
+  }
+  std::cout << "[" << aRefsToFeature.size() << "] " << aRefsInfo << std::endl;
+
+
+  std::cout << std::endl;
+  std::cout << "---- SPLIT ----" << std::endl;
+  std::cout << std::endl;
+#endif
+
+  std::string aFeatureKind = aBaseFeature->getKind();
+  FeaturePtr aSplitFeature, anAfterFeature;
+  std::set<AttributePoint2DPtr> aFurtherCoincidences;
+  std::set<FeaturePtr> aCreatedFeatures;
+  std::set<std::pair<AttributePtr, AttributePtr>> aModifiedAttributes;
+  if (aFeatureKind == SketchPlugin_Line::ID())
+    splitLine(aSplitFeature, aBaseFeature, anAfterFeature, aFurtherCoincidences, aCreatedFeatures,
+              aModifiedAttributes);
+  else if (aFeatureKind == SketchPlugin_Arc::ID())
+    splitArc(aSplitFeature, aBaseFeature, anAfterFeature, aFurtherCoincidences, aCreatedFeatures,
+             aModifiedAttributes);
+  if (aFeatureKind == SketchPlugin_Circle::ID()) {
+    FeaturePtr aCircleFeature = aBaseFeature;
+    splitCircle(aSplitFeature, aBaseFeature, anAfterFeature, aFurtherCoincidences,
+      aCreatedFeatures, aModifiedAttributes);
+
+    updateRefFeatureConstraints(getFeatureResult(aBaseFeature), aRefsToFeature);
+
+    AttributePtr aCenterAttr = aCircleFeature->attribute(SketchPlugin_Circle::CENTER_ID());
+    aFeaturesToDelete.insert(aCircleFeature);
+    // as circle is removed, temporary fill this attribute*/
+    aBaseObjectAttr->setObject(ResultPtr());
+  }
+
+#ifdef DEBUG_SPLIT
+  std::cout << "---- OUT PARAMETERS ----" << std::endl;
+  std::cout << "Base modified feature:" << getFeatureInfo(aBaseFeature) << std::endl;
+  std::cout << "Split feature:" << getFeatureInfo(aSplitFeature) << std::endl;
+  std::cout << "After feature:" << getFeatureInfo(anAfterFeature) << std::endl;
+  std::cout << std::endl;
+
+  std::cout << "Created features by split:[" << aCreatedFeatures.size() << "]" << std::endl;
+  std::set<FeaturePtr>::const_iterator aFIt = aCreatedFeatures.begin(),
+                                       aFLast = aCreatedFeatures.end();
+  for (; aFIt != aFLast; aFIt++) {
+    std::cout << getFeatureInfo(*aFIt) << std::endl;
+  }
+  std::cout << std::endl;
+
+  std::cout << "Attributes for further Coincidences:" << std::endl;
+  std::set<AttributePoint2DPtr>::const_iterator anIt = aFurtherCoincidences.begin(),
+                                                aLast = aFurtherCoincidences.end();
+  for (; anIt != aLast; anIt++) {
+    AttributePtr anAttribute = *anIt;
+    FeaturePtr aFeature = ModelAPI_Feature::feature(anAttribute->owner());
+    std::cout << ModelGeomAlgo_Point2D::getPointAttributeInfo(anAttribute)
+              << " [" << getFeatureInfo(aFeature, false) << "]" << std::endl;
+  }
+
+  std::cout << "Modifed attributes (constraints to attributes are moved here):" << std::endl;
+  std::set<std::pair<AttributePtr, AttributePtr> >::const_iterator
+    aPIt = aModifiedAttributes.begin(), aPLast = aModifiedAttributes.end();
+  std::string aResInfo;
+  for (; aPIt != aPLast; aPIt++) {
+    if (!aResInfo.empty())
+      aResInfo += "\n";
+
+    std::pair<AttributePtr, AttributePtr> aPair = *aPIt;
+
+    AttributePtr anAttr = aPair.first;
+    aResInfo.append(anAttr->id());
+    FeaturePtr aFeature = ModelAPI_Feature::feature(anAttr->owner());
+    aResInfo.append("(" + aFeature->name() + ") ");
+
+    aResInfo.append("  - is modified to -  ");
+
+    anAttr = aPair.second;
+    aResInfo.append(anAttr->id());
+    aFeature = ModelAPI_Feature::feature(anAttr->owner());
+    aResInfo.append("(" + aFeature->name() + ") ");
+  }
+  std::cout << aResInfo << std::endl;
+#endif
+
+  std::set<ResultPtr> aFeatureResults;
+  aFeatureResults.insert(getFeatureResult(aBaseFeature));
+  if (anAfterFeature.get() && anAfterFeature != aBaseFeature)
+    aFeatureResults.insert(getFeatureResult(anAfterFeature));
+
+  // coincidence to feature
+  updateCoincidenceConstraintsToFeature(aCoincidenceToFeature, aFurtherCoincidences,
+                                        aFeatureResults, aSplitFeature);
+  // tangency
+  updateTangentConstraintsToFeature(aTangentFeatures, aFurtherCoincidences);
+
+  updateRefAttConstraints(aBaseRefAttributes, aModifiedAttributes);
+
+  // delete constraints
+#ifdef DEBUG_SPLIT
+  std::cout << "remove features and references:" << std::endl;
+  std::set<FeaturePtr>::const_iterator aDIt = aFeaturesToDelete.begin(),
+                                       aDLast = aFeaturesToDelete.end();
+  for (; aDIt != aDLast; aDIt++) {
+    std::cout << getFeatureInfo(*aDIt, false) << std::endl;
+    std::cout << std::endl;
+  }
+#endif
+  ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToDelete);
+
+#ifdef DEBUG_SPLIT
+  std::cout << "update features after split:" << std::endl;
+  std::set<FeaturePtr>::const_iterator anUIt = aFeaturesToUpdate.begin(),
+                                       anULast = aFeaturesToUpdate.end();
+  for (; anUIt != anULast; anUIt++) {
+    std::cout << getFeatureInfo(*anUIt, false) << std::endl;
+    std::cout << std::endl;
   }
+#endif
+  updateFeaturesAfterSplit(aFeaturesToUpdate);
 
   // Send events to update the sub-features by the solver.
   if(isUpdateFlushed) {
     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
   }
-*/
+
+#ifdef DEBUG_SPLIT
+  std::cout << "SKETCH FEATURES (after split) [" << aSketch->numberOfSubs() << "]:" << std::endl;
+  for (int i = 0, aNbSubs = aSketch->numberOfSubs(); i < aNbSubs; i++) {
+    std::cout << getFeatureInfo(aSketch->subFeature(i), false) << std::endl;
+  }
+#endif
 }
 
-void SketchPlugin_ConstraintSplit::attributeChanged(const std::string& theID)
+bool SketchPlugin_ConstraintSplit::isMacro() const
 {
-/*  if(theID == SketchPlugin_Constraint::ENTITY_A()) {
-    if(myListOfPointsChangedInCode) {
-      return;
+  return true;
+}
+
+AISObjectPtr SketchPlugin_ConstraintSplit::getAISObject(AISObjectPtr thePrevious)
+{
+  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
+                                           data()->attribute(SketchPlugin_Constraint::VALUE()));
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+
+  AttributePoint2DPtr aFirstPointAttrOfSplit = getPointOfRefAttr(
+                                        data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  AttributePoint2DPtr aSecondPointAttrOfSplit = getPointOfRefAttr(
+                                        data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
+
+  if (aBaseObjectAttr->isInitialized() && aBaseFeature.get() &&
+      aFirstPointAttrOfSplit->isInitialized() &&
+      aSecondPointAttrOfSplit->isInitialized()) {
+
+    ResultPtr aResult = getFeatureResult(aBaseFeature);
+    GeomShapePtr aBaseShape = aResult->shape();
+    std::list<std::shared_ptr<GeomAPI_Pnt> > aPoints;
+
+    std::shared_ptr<GeomAPI_Pnt2d> aStartPnt2d = aFirstPointAttrOfSplit->pnt();
+    std::shared_ptr<GeomAPI_Pnt> aStartPoint = sketch()->to3D(aStartPnt2d->x(), aStartPnt2d->y());
+    aPoints.push_back(aStartPoint);
+
+    std::shared_ptr<GeomAPI_Pnt2d> aSecondPnt2d = aSecondPointAttrOfSplit->pnt();
+    std::shared_ptr<GeomAPI_Pnt> aSecondPoint =
+      sketch()->to3D(aSecondPnt2d->x(), aSecondPnt2d->y());
+    aPoints.push_back(aSecondPoint);
+
+    std::set<std::shared_ptr<GeomAPI_Shape> > aSplitShapes;
+
+    GeomAlgoAPI_ShapeTools::splitShape(aBaseShape, aPoints, aSplitShapes);
+    std::shared_ptr<GeomAPI_Shape> aShape =
+      GeomAlgoAPI_ShapeTools::findShape(aPoints, aSplitShapes);
+
+    AISObjectPtr anAIS = thePrevious;
+    if (aShape) {
+      if (!anAIS)
+        anAIS = AISObjectPtr(new GeomAPI_AISObject);
+      anAIS->createShape(aShape);
+      anAIS->setWidth(5);
+      std::vector<int> aColor;
+      aColor = Config_PropManager::color("Visualization", "sketch_entity_color",
+                                          SKETCH_ENTITY_COLOR);
+     anAIS->setColor(aColor[0], aColor[1], aColor[2]);
     }
+    return anAIS;
+  }
+  return AISObjectPtr();
+}
+
+std::shared_ptr<GeomDataAPI_Point2D> SketchPlugin_ConstraintSplit::getPointOfRefAttr(
+                                                      const AttributePtr& theAttribute)
+{
+  AttributePoint2DPtr aPointAttribute;
 
-    // Clear results.
-    clearResults();
-
-    // Clear list of new points.
-    myNewPoints.clear();
-
-    // Get list of points for fillets and current radius.
-    AttributeRefAttrListPtr aRefListOfFilletPoints = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttrList>(
-      data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
-    AttributeDoublePtr aRadiusAttribute = real(VALUE());
-    int aListSize = aRefListOfFilletPoints->size();
-    if(aListSize == 0 && !myRadiusChangedByUser) {
-      // If list is empty reset radius to zero (if it was not changed by user).
-      myRadiusChangedInCode = true;
-      aRadiusAttribute->setValue(0);
-      myRadiusChangedInCode = false;
-      return;
+  if (theAttribute->attributeType() == ModelAPI_AttributeRefAttr::typeId()) {
+    AttributeRefAttrPtr aRefAttr =
+      std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
+    if (aRefAttr.get() && aRefAttr->isInitialized()) {
+      AttributePtr anAttribute = aRefAttr->attr();
+      if (anAttribute.get() && anAttribute->attributeType() == GeomDataAPI_Point2D::typeId())
+        aPointAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttribute);
     }
+  }
+  return aPointAttribute;
+}
 
-    // Iterate over points to get base lines an calculate radius for fillets.
-    double aMinimumRadius = 0;
-    std::list<std::pair<ObjectPtr, AttributePtr>> aSelectedPointsList = aRefListOfFilletPoints->list();
-    std::list<std::pair<ObjectPtr, AttributePtr>>::iterator anIter = aSelectedPointsList.begin();
-    std::set<AttributePtr> aPointsToSkeep;
-    for(int anIndex = 0; anIndex < aListSize; anIndex++, anIter++) {
-      AttributePtr aFilletPointAttr = (*anIter).second;
-      std::shared_ptr<GeomDataAPI_Point2D> aFilletPoint2D =
-        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aFilletPointAttr);
-      if(!aFilletPoint2D.get()) {
-        myNewPoints.clear();
-        setError("Error: One of the selected points is invalid.");
-        return;
-      }
+void SketchPlugin_ConstraintSplit::getFeaturePoints(const FeaturePtr& theFeature,
+                                                    AttributePoint2DPtr& theStartPointAttr,
+                                                    AttributePoint2DPtr& theEndPointAttr)
+{
+  std::string aFeatureKind = theFeature->getKind();
+  std::string aStartAttributeName, anEndAttributeName;
+  if (aFeatureKind == SketchPlugin_Line::ID()) {
+    aStartAttributeName = SketchPlugin_Line::START_ID();
+    anEndAttributeName = SketchPlugin_Line::END_ID();
+  }
+  else if (aFeatureKind == SketchPlugin_Arc::ID()) {
+    aStartAttributeName = SketchPlugin_Arc::START_ID();
+    anEndAttributeName = SketchPlugin_Arc::END_ID();
+  }
+  if (!aStartAttributeName.empty() && !anEndAttributeName.empty()) {
+    theStartPointAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+                                         theFeature->attribute(aStartAttributeName));
+    theEndPointAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+                                         theFeature->attribute(anEndAttributeName));
+  }
+}
 
-      // If point or coincident point is already in list remove it from attribute.
-      if(aPointsToSkeep.find(aFilletPointAttr) != aPointsToSkeep.end()) {
-        myListOfPointsChangedInCode = true;
-        aRefListOfFilletPoints->remove(aFilletPointAttr);
-        myListOfPointsChangedInCode = false;
-        continue;
-      }
+void SketchPlugin_ConstraintSplit::getConstraints(std::set<FeaturePtr>& theFeaturesToDelete,
+                                      std::set<FeaturePtr>& theFeaturesToUpdate,
+                                      std::map<FeaturePtr, IdToPointPair>& theTangentFeatures,
+                                      std::map<FeaturePtr, IdToPointPair>& theCoincidenceToFeature)
+{
+  std::shared_ptr<ModelAPI_Data> aData = data();
 
-      // Obtain constraint coincidence for the fillet point.
-      FeaturePtr aConstraintCoincidence;
-      const std::set<AttributePtr>& aRefsList = aFilletPointAttr->owner()->data()->refsToMe();
-      for(std::set<AttributePtr>::const_iterator anIt = aRefsList.cbegin(); anIt != aRefsList.cend(); ++anIt) {
-        std::shared_ptr<ModelAPI_Attribute> anAttr = (*anIt);
-        FeaturePtr aConstrFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
-        if(aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
-          AttributeRefAttrPtr anAttrRefA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_A()));
-          AttributeRefAttrPtr anAttrRefB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
-            aConstrFeature->attribute(SketchPlugin_ConstraintCoincidence::ENTITY_B()));
-          if(anAttrRefA.get()) {
-            AttributePtr anAttrA = anAttrRefA->attr();
-            if(aFilletPointAttr == anAttrA) {
-              aConstraintCoincidence = aConstrFeature;
-              break;
-            }
-          }
-          if(anAttrRefB.get()) {
-            AttributePtr anAttrB = anAttrRefB->attr();
-            if(aFilletPointAttr == anAttrB) {
-              aConstraintCoincidence = aConstrFeature;
+  // Check the base objects are initialized.
+  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
+                                            aData->attribute(SketchPlugin_Constraint::VALUE()));
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  ResultPtr aBaseFeatureResult = getFeatureResult(aBaseFeature);
+
+  std::set<AttributePtr> aRefsList = aBaseFeatureResult->data()->refsToMe();
+  std::set<AttributePtr> aFRefsList = aBaseFeature->data()->refsToMe();
+  aRefsList.insert(aFRefsList.begin(), aFRefsList.end());
+
+  std::set<AttributePtr>::const_iterator aIt;
+  for (aIt = aRefsList.cbegin(); aIt != aRefsList.cend(); ++aIt) {
+    std::shared_ptr<ModelAPI_Attribute> aAttr = (*aIt);
+    FeaturePtr aRefFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aAttr->owner());
+    std::string aRefFeatureKind = aRefFeature->getKind();
+    if (aRefFeatureKind == SketchPlugin_ConstraintMirror::ID() ||
+        aRefFeatureKind == SketchPlugin_MultiRotation::ID() ||
+        aRefFeatureKind == SketchPlugin_MultiTranslation::ID())
+      theFeaturesToDelete.insert(aRefFeature);
+    else if (aRefFeatureKind == SketchPlugin_ConstraintLength::ID())
+      theFeaturesToUpdate.insert(aRefFeature);
+    else if (aRefFeatureKind == SketchPlugin_ConstraintTangent::ID()) {
+      if (aBaseFeature->getKind() == SketchPlugin_Circle::ID()) /// TEMPORARY limitaion
+        /// until tangency between arc and line is implemented
+        theFeaturesToDelete.insert(aRefFeature);
+      else {
+        std::string anAttributeToBeModified;
+        AttributePoint2DPtr aTangentPoint;
+        ObjectPtr aResult1 = aRefFeature->refattr(SketchPlugin_Constraint::ENTITY_A())->object();
+        ObjectPtr aResult2 = aRefFeature->refattr(SketchPlugin_Constraint::ENTITY_B())->object();
+        if (aResult1.get() && aResult2.get()) {
+          FeaturePtr aCoincidenceFeature =
+            SketchPlugin_ConstraintCoincidence::findCoincidenceFeature
+                                                       (ModelAPI_Feature::feature(aResult1),
+                                                        ModelAPI_Feature::feature(aResult2));
+          // get the point not lying on the splitting feature
+          for (int i = 0; i < CONSTRAINT_ATTR_SIZE; ++i) {
+            AttributeRefAttrPtr aRefAttr = aCoincidenceFeature->refattr(ATTRIBUTE(i));
+            if (!aRefAttr || aRefAttr->isObject())
+              continue;
+            AttributePoint2DPtr aPoint =
+                std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aRefAttr->attr());
+            if (!aPoint)
+              continue;
+            if (aPoint->owner() != aBaseFeature) {
+              aTangentPoint = aPoint;
               break;
             }
           }
         }
+        if (aTangentPoint.get()) {
+          FeaturePtr aFeature1 = ModelAPI_Feature::feature(aResult1);
+          std::string anAttributeToBeModified = aFeature1 == aBaseFeature
+                       ? SketchPlugin_Constraint::ENTITY_A() : SketchPlugin_Constraint::ENTITY_B();
+          theTangentFeatures[aRefFeature] = std::make_pair(anAttributeToBeModified, aTangentPoint);
+        }
+        else /// there is not coincident point between tangent constraint
+          theFeaturesToDelete.insert(aRefFeature);
       }
-
-      if(!aConstraintCoincidence.get()) {
-        myNewPoints.clear();
-        setError("Error: No coincident edges at one of the selected points.");
-        return;
+    }
+    else if (aRefFeatureKind == SketchPlugin_ConstraintCoincidence::ID()) {
+      std::string anAttributeToBeModified;
+      AttributePoint2DPtr aCoincidentPoint;
+      AttributeRefAttrPtr anAttrA = aRefFeature->refattr(SketchPlugin_Constraint::ENTITY_A());
+      AttributeRefAttrPtr anAttrB = aRefFeature->refattr(SketchPlugin_Constraint::ENTITY_B());
+      bool isToFeature = false;
+      if (anAttrA->isObject() || anAttrB->isObject()) { /// coincidence to base feature
+        FeaturePtr aFeature = anAttrA->isObject() ? ModelAPI_Feature::feature(anAttrA->object())
+                                                  : FeaturePtr();
+        isToFeature = aFeature.get() && aFeature == aBaseFeature;
+        anAttributeToBeModified = anAttrA->id();
+        if (!isToFeature) {
+          aFeature = anAttrB->isObject() ? ModelAPI_Feature::feature(anAttrB->object())
+                                         : FeaturePtr();
+          isToFeature = aFeature.get() && aFeature == aBaseFeature;
+          anAttributeToBeModified = anAttrB->id();
+        }
+        if (isToFeature)
+          aCoincidentPoint = SketchPlugin_ConstraintCoincidence::getPoint(aRefFeature);
       }
-
-      // Get coincides from constraint.
-      std::set<FeaturePtr> aCoincides;
-
-
-      SketchPlugin_Tools::findCoincidences(aConstraintCoincidence,
-                                           SketchPlugin_ConstraintCoincidence::ENTITY_A(),
-                                           aCoincides);
-      SketchPlugin_Tools::findCoincidences(aConstraintCoincidence,
-                                           SketchPlugin_ConstraintCoincidence::ENTITY_B(),
-                                           aCoincides);
-
-      // Remove points from set of coincides. Also get all attributes which is equal to this point to exclude it.
-      std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt2d = aFilletPoint2D->pnt();
-      std::set<FeaturePtr> aNewSetOfCoincides;
-      for(std::set<FeaturePtr>::iterator anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
-        std::string aFeatureKind = (*anIt)->getKind();
-        if(aFeatureKind == SketchPlugin_Point::ID()) {
-          AttributePtr anAttr = (*anIt)->attribute(SketchPlugin_Point::COORD_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPoint2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttr);
-          if(aPoint2D.get() && aFilletPnt2d->isEqual(aPoint2D->pnt())) {
-            aPointsToSkeep.insert(anAttr);
-          }
-        } else if(aFeatureKind == SketchPlugin_Line::ID()) {
-          AttributePtr anAttrStart = (*anIt)->attribute(SketchPlugin_Line::START_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPointStart2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrStart);
-          if(aPointStart2D.get() && aFilletPnt2d->isEqual(aPointStart2D->pnt())) {
-            aPointsToSkeep.insert(anAttrStart);
-          }
-          AttributePtr anAttrEnd = (*anIt)->attribute(SketchPlugin_Line::END_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPointEnd2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrEnd);
-          if(aPointEnd2D.get() && aFilletPnt2d->isEqual(aPointEnd2D->pnt())) {
-            aPointsToSkeep.insert(anAttrEnd);
-          }
-          aNewSetOfCoincides.insert(*anIt);
-        } else if(aFeatureKind == SketchPlugin_Arc::ID() ) {
-          AttributePtr anAttrCenter = (*anIt)->attribute(SketchPlugin_Arc::CENTER_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPointCenter2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrCenter);
-          if(aPointCenter2D.get() && aFilletPnt2d->isEqual(aPointCenter2D->pnt())) {
-            aPointsToSkeep.insert(anAttrCenter);
-            continue;
-          }
-          AttributePtr anAttrStart = (*anIt)->attribute(SketchPlugin_Arc::START_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPointStart2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrStart);
-          if(aPointStart2D.get() && aFilletPnt2d->isEqual(aPointStart2D->pnt())) {
-            aPointsToSkeep.insert(anAttrStart);
+      if (!isToFeature) { /// coincidence to point on base feature
+        AttributePtr anAttribute;
+
+        if (!anAttrA->isObject()) {
+          AttributePtr aCurAttribute = anAttrA->attr();
+          if (aCurAttribute.get()) {
+            FeaturePtr aCurFeature = ModelAPI_Feature::feature(aCurAttribute->owner());
+            if (aCurFeature.get() && aCurFeature == aBaseFeature) {
+              anAttribute = anAttrB->attr();
+              anAttributeToBeModified = anAttrA->id();
+            }
           }
-          AttributePtr anAttrEnd = (*anIt)->attribute(SketchPlugin_Arc::END_ID());
-          std::shared_ptr<GeomDataAPI_Point2D> aPointEnd2D =
-            std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrEnd);
-          if(aPointEnd2D.get() && aFilletPnt2d->isEqual(aPointEnd2D->pnt())) {
-            aPointsToSkeep.insert(anAttrEnd);
+        }
+        if (!anAttribute.get() && !anAttrB->isObject()) {
+          AttributePtr aCurAttribute = anAttrB->attr();
+          if (aCurAttribute.get()) {
+            FeaturePtr aCurFeature = ModelAPI_Feature::feature(aCurAttribute->owner());
+            if (aCurFeature.get() && aCurFeature == aBaseFeature) {
+              anAttribute = anAttrA->attr();
+              anAttributeToBeModified = anAttrB->id();
+            }
           }
-          aNewSetOfCoincides.insert(*anIt);
         }
+        if (anAttribute.get())
+          aCoincidentPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttribute);
       }
-      aCoincides = aNewSetOfCoincides;
-
-      // If we still have more than two coincides remove auxilary entities from set of coincides.
-      if(aCoincides.size() > 2) {
-        aNewSetOfCoincides.clear();
-        for(std::set<FeaturePtr>::iterator anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
-          if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
-            aNewSetOfCoincides.insert(*anIt);
+      if (aCoincidentPoint.get() && isToFeature)
+        theCoincidenceToFeature[aRefFeature] = std::make_pair(anAttributeToBeModified,
+                                                              aCoincidentPoint);
+    }
+  }
+}
+
+void SketchPlugin_ConstraintSplit::getRefAttributes(const FeaturePtr& theFeature,
+                                    std::map<AttributePtr, std::list<AttributePtr> >& theRefs,
+                                    std::list<AttributePtr>& theRefsToFeature)
+{
+  theRefs.clear();
+
+  std::list<AttributePtr> aPointAttributes =
+    theFeature->data()->attributes(GeomDataAPI_Point2D::typeId());
+  std::set<AttributePtr> aPointAttributesSet;
+
+  std::list<AttributePtr>::const_iterator aPIt =
+    aPointAttributes.begin(), aPLast = aPointAttributes.end();
+  for (; aPIt != aPLast; aPIt++)
+    aPointAttributesSet.insert(*aPIt);
+
+  std::set<AttributePtr> aRefsAttributes = getFeatureResult(theFeature)->data()->refsToMe();
+  std::set<AttributePtr> aFRefsList = theFeature->data()->refsToMe();
+  aRefsAttributes.insert(aFRefsList.begin(), aFRefsList.end());
+
+  std::set<AttributePtr>::const_iterator aIt;
+  for (aIt = aRefsAttributes.cbegin(); aIt != aRefsAttributes.cend(); ++aIt) {
+    AttributePtr anAttr = (*aIt);
+    FeaturePtr anAttrFeature = ModelAPI_Feature::feature(anAttr->owner());
+    if (anAttrFeature.get() != this &&
+        anAttr.get() && anAttr->attributeType() == ModelAPI_AttributeRefAttr::typeId()) {
+      AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(anAttr);
+      if (!aRefAttr->isObject()) { /// find attributes referenced to feature point attributes
+        AttributePtr anAttrInRef = aRefAttr->attr();
+        if (anAttrInRef.get() &&
+            aPointAttributesSet.find(anAttrInRef) != aPointAttributesSet.end()) {
+          if (theRefs.find(anAttrInRef) != theRefs.end())
+            theRefs[anAttrInRef].push_back(aRefAttr);
+          else {
+            std::list<AttributePtr> anAttrList;
+            anAttrList.push_back(aRefAttr);
+            theRefs[anAttrInRef] = anAttrList;
           }
         }
-        aCoincides = aNewSetOfCoincides;
       }
-
-      if(aCoincides.size() != 2) {
-        myNewPoints.clear();
-        setError("Error: One of the selected points does not have two suitable edges for fillet.");
-        return;
+      else { /// find attributes referenced to feature itself
+        theRefsToFeature.push_back(anAttr);
       }
+    }
+  }
+}
+
+void SketchPlugin_ConstraintSplit::updateCoincidenceConstraintsToFeature(
+      const std::map<std::shared_ptr<ModelAPI_Feature>, IdToPointPair>& theCoincidenceToFeature,
+      const std::set<std::shared_ptr<GeomDataAPI_Point2D> >& theFurtherCoincidences,
+      const std::set<ResultPtr>& theFeatureResults,
+      const FeaturePtr& theSplitFeature)
+{
+  if (theCoincidenceToFeature.empty())
+    return;
 
-      // Store base point for fillet.
-      aPointsToSkeep.insert(aFilletPointAttr);
-      myNewPoints.insert(aFilletPointAttr);
-
-      // Get base lines for fillet.
-      FeaturePtr anOldFeatureA, anOldFeatureB;
-      std::set<FeaturePtr>::iterator aLinesIt = aCoincides.begin();
-      anOldFeatureA = *aLinesIt++;
-      anOldFeatureB = *aLinesIt;
-
-      // Getting radius value if it was not changed by user.
-      if(!myRadiusChangedByUser) {
-        // Getting points located at 1/3 of edge length from fillet point.
-        std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt2d = aFilletPoint2D->pnt();
-        std::shared_ptr<GeomAPI_Pnt2d> aPntA, aPntB;
-        getPointOnEdge(anOldFeatureA, aFilletPnt2d, aPntA);
-        getPointOnEdge(anOldFeatureB, aFilletPnt2d, aPntB);
-
-        /// Getting distances.
-        double aDistanceA = getProjectionDistance(anOldFeatureB, aPntA);
-        double aDistanceB = getProjectionDistance(anOldFeatureA, aPntB);
-        double aRadius = aDistanceA < aDistanceB ? aDistanceA / 2.0 : aDistanceB / 2.0;
-        aMinimumRadius = aMinimumRadius == 0 ? aRadius : aRadius < aMinimumRadius ? aRadius : aMinimumRadius;
+  // we should build coincidence constraints to end of the split feature
+  std::set<std::shared_ptr<GeomDataAPI_Point2D> > aNewCoincidencesToSplitFeature;
+  AttributePoint2DPtr aStartPointAttr, anEndPointAttr;
+  getFeaturePoints(theSplitFeature, aStartPointAttr, anEndPointAttr);
+  if (theFurtherCoincidences.find(aStartPointAttr) == theFurtherCoincidences.end())
+    aNewCoincidencesToSplitFeature.insert(aStartPointAttr);
+  if (theFurtherCoincidences.find(anEndPointAttr) == theFurtherCoincidences.end())
+    aNewCoincidencesToSplitFeature.insert(anEndPointAttr);
+
+  std::map<FeaturePtr, IdToPointPair>::const_iterator aCIt = theCoincidenceToFeature.begin(),
+                                                            aCLast = theCoincidenceToFeature.end();
+#ifdef DEBUG_SPLIT
+  std::cout << std::endl;
+  std::cout << "Coincidences to feature(modified):"<< std::endl;
+#endif
+  for (; aCIt != aCLast; aCIt++) {
+    FeaturePtr aCoincFeature = aCIt->first;
+    std::string anAttributeId = aCIt->second.first;
+    AttributePoint2DPtr aCoincPoint = aCIt->second.second;
+    std::set<AttributePoint2DPtr>::const_iterator aFCIt = theFurtherCoincidences.begin(),
+                                                  aFCLast = theFurtherCoincidences.end();
+    std::shared_ptr<GeomAPI_Pnt2d> aCoincPnt = aCoincPoint->pnt();
+    AttributePoint2DPtr aFeaturePointAttribute;
+    for (; aFCIt != aFCLast && !aFeaturePointAttribute.get(); aFCIt++) {
+      AttributePoint2DPtr aFCAttribute = *aFCIt;
+      if (aCoincPnt->isEqual(aFCAttribute->pnt()))
+        aFeaturePointAttribute = aFCAttribute;
+    }
+    if (aFeaturePointAttribute.get()) {
+      aCoincFeature->refattr(anAttributeId)->setObject(ResultPtr());
+      aCoincFeature->refattr(anAttributeId)->setAttr(aFeaturePointAttribute);
+      // create new coincidences to split feature points
+      std::set<AttributePoint2DPtr>::const_iterator aSFIt = aNewCoincidencesToSplitFeature.begin(),
+                                                    aSFLast = aNewCoincidencesToSplitFeature.end();
+      for (; aSFIt != aSFLast; aSFIt++) {
+        AttributePoint2DPtr aSFAttribute = *aSFIt;
+        if (aCoincPnt->isEqual(aSFAttribute->pnt())) {
+          std::string aSecondAttribute = SketchPlugin_Constraint::ENTITY_A();
+          if (anAttributeId == SketchPlugin_Constraint::ENTITY_A())
+            aSecondAttribute = SketchPlugin_Constraint::ENTITY_B();
+          createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                           aSFAttribute, aCoincFeature->refattr(aSecondAttribute)->attr());
+        }
       }
     }
+    else {
+      /// find feature by shape intersected the point
+      ResultPtr aResultForCoincidence = *(theFeatureResults.begin());
 
-    // Set new default radius if it was not changed by user.
-    if(!myRadiusChangedByUser) {
-      myRadiusChangedInCode = true;
-      aRadiusAttribute->setValue(aMinimumRadius);
-      myRadiusChangedInCode = false;
-    }
+      if (theFeatureResults.size() > 1) { // try to find point on additional feature
+        ResultPtr anAddtionalResult = *(theFeatureResults.begin()++);
+        GeomShapePtr aShape = anAddtionalResult->shape();
 
-  } else if(theID == SketchPlugin_Constraint::VALUE()) {
-    if(myRadiusInitialized && !myRadiusChangedInCode) {
-      myRadiusChangedByUser = true;
-    }
-    if(!myRadiusInitialized) {
-      myRadiusInitialized = true;
+        std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aCoincPoint->pnt();
+        std::shared_ptr<GeomAPI_Pnt> aPoint = sketch()->to3D(aPnt2d->x(), aPnt2d->y());
+
+        std::shared_ptr<GeomAPI_Pnt> aProjectedPoint;
+        if (ModelGeomAlgo_Point2D::isPointOnEdge(aShape, aPoint, aProjectedPoint))
+          aResultForCoincidence = anAddtionalResult;
+      }
+      aCoincFeature->refattr(anAttributeId)->setObject(aResultForCoincidence);
     }
+#ifdef DEBUG_SPLIT
+  std::cout << " -" << getFeatureInfo(aCoincFeature) << std::endl;
+#endif
   }
-*/
 }
 
-//AISObjectPtr SketchPlugin_ConstraintSplit::getAISObject(AISObjectPtr thePrevious)
-//{
-//  if (!sketch())
-//    return thePrevious;
-//
-//  AISObjectPtr anAIS = thePrevious;
-//  /// TODO: Equal constraint presentation should be put here
-//  return anAIS;
-//}
-
-bool SketchPlugin_ConstraintSplit::isMacro() const
+void SketchPlugin_ConstraintSplit::updateTangentConstraintsToFeature(
+      const std::map<std::shared_ptr<ModelAPI_Feature>, IdToPointPair>& theTangentFeatures,
+      const std::set<std::shared_ptr<GeomDataAPI_Point2D> >& theFurtherCoincidences)
 {
-  return true;
-}
+  if (theTangentFeatures.empty())
+    return;
 
-//void SketchPlugin_ConstraintSplit::clearResults()
-//{
-///*  // Clear auxiliary flag on initial objects.
-//  for(std::map<AttributePtr, FilletFeatures>::iterator aPointsIter = myPointFeaturesMap.begin();
-//      aPointsIter != myPointFeaturesMap.end();) {
-//    const FilletFeatures& aFilletFeatures = aPointsIter->second;
-//    std::list<std::pair<FeaturePtr, bool>>::const_iterator aFeatureIt;
-//    for(aFeatureIt = aFilletFeatures.baseEdgesState.cbegin();
-//        aFeatureIt != aFilletFeatures.baseEdgesState.cend();
-//        ++aFeatureIt) {
-//      aFeatureIt->first->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue(aFeatureIt->second);
-//    }
-//    ++aPointsIter;
-//  }
-//
-//  // And remove all produced features.
-//  DocumentPtr aDoc = sketch()->document();
-//  for(std::map<AttributePtr, FilletFeatures>::iterator aPointsIter = myPointFeaturesMap.begin();
-//      aPointsIter != myPointFeaturesMap.end();) {
-//    // Remove all produced constraints.
-//    const FilletFeatures& aFilletFeatures = aPointsIter->second;
-//    std::list<FeaturePtr>::const_iterator aFeatureIt;
-//    for(aFeatureIt = aFilletFeatures.resultConstraints.cbegin();
-//        aFeatureIt != aFilletFeatures.resultConstraints.cend();
-//        ++aFeatureIt) {
-//      aDoc->removeFeature(*aFeatureIt);
-//    }
-//
-//    // Remove all result edges.
-//    for(aFeatureIt = aFilletFeatures.resultEdges.cbegin();
-//        aFeatureIt != aFilletFeatures.resultEdges.cend();
-//        ++aFeatureIt) {
-//      aDoc->removeFeature(*aFeatureIt);
-//    }
-//
-//    // Remove point from map.
-//    myPointFeaturesMap.erase(aPointsIter++);
-//  }
-//*/
-//};
-//
-//
-//// =========   Auxiliary functions   =================
-//void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
-//                           FeaturePtr theFeature, const std::string& theFeatureAttribute)
-//{
-//  std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-//      theNewArc->attribute(theNewArcAttribute))->pnt();
-//  std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-//      theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
-//}
-
-/*/// \brief Find intersections of lines shifted along normal direction
-void possibleFilletCenterLineLine(
-    std::shared_ptr<GeomAPI_XY> thePointA, std::shared_ptr<GeomAPI_Dir2d> theDirA,
-    std::shared_ptr<GeomAPI_XY> thePointB, std::shared_ptr<GeomAPI_Dir2d> theDirB,
-    double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
-{
-  std::shared_ptr<GeomAPI_Dir2d> aDirAT(new GeomAPI_Dir2d(-theDirA->y(), theDirA->x()));
-  std::shared_ptr<GeomAPI_Dir2d> aDirBT(new GeomAPI_Dir2d(-theDirB->y(), theDirB->x()));
-  std::shared_ptr<GeomAPI_XY> aPntA, aPntB;
-  double aDet = theDirA->cross(theDirB);
-  for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
-    aPntA = thePointA->added(aDirAT->xy()->multiplied(aStepA * theRadius));
-    for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
-      aPntB = thePointB->added(aDirBT->xy()->multiplied(aStepB * theRadius));
-      double aVX = aDirAT->xy()->dot(aPntA);
-      double aVY = aDirBT->xy()->dot(aPntB);
-      std::shared_ptr<GeomAPI_XY> aPoint(new GeomAPI_XY(
-          (theDirB->x() * aVX - theDirA->x() * aVY) / aDet,
-          (theDirB->y() * aVX - theDirA->y() * aVY) / aDet));
-      theCenters.push_back(aPoint);
+  std::map<FeaturePtr, IdToPointPair>::const_iterator aTIt = theTangentFeatures.begin(),
+                                                      aTLast = theTangentFeatures.end();
+#ifdef DEBUG_SPLIT
+  std::cout << std::endl;
+  std::cout << "Tangencies to feature(modified):"<< std::endl;
+#endif
+  for (; aTIt != aTLast; aTIt++) {
+    FeaturePtr aTangentFeature = aTIt->first;
+    std::string anAttributeId = aTIt->second.first;
+    AttributePoint2DPtr aTangentPoint = aTIt->second.second;
+    std::set<AttributePoint2DPtr>::const_iterator aFCIt = theFurtherCoincidences.begin(),
+                                                  aFCLast = theFurtherCoincidences.end();
+    std::shared_ptr<GeomAPI_Pnt2d> aCoincPnt = aTangentPoint->pnt();
+    AttributePoint2DPtr aFeaturePointAttribute;
+    /// here we rely on created coincidence between further coincidence point and tangent result
+    for (; aFCIt != aFCLast && !aFeaturePointAttribute.get(); aFCIt++) {
+      AttributePoint2DPtr aFCAttribute = *aFCIt;
+      if (aCoincPnt->isEqual(aFCAttribute->pnt()))
+        aFeaturePointAttribute = aFCAttribute;
+    }
+    if (aFeaturePointAttribute.get()) {
+      FeaturePtr aFeature =
+        std::dynamic_pointer_cast<ModelAPI_Feature>(aFeaturePointAttribute->owner());
+      aTangentFeature->refattr(anAttributeId)->setObject(getFeatureResult(aFeature));
     }
+#ifdef DEBUG_SPLIT
+  std::cout << " -" << getFeatureInfo(aTangentFeature) << std::endl;
+#endif
   }
 }
 
-/// \brief Find intersections of line shifted along normal direction in both sides
-///        and a circle with extended radius
-void possibleFilletCenterLineArc(
-    std::shared_ptr<GeomAPI_XY> theStartLine, std::shared_ptr<GeomAPI_Dir2d> theDirLine,
-    std::shared_ptr<GeomAPI_XY> theCenterArc, double theRadiusArc,
-    double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
+void SketchPlugin_ConstraintSplit::updateRefFeatureConstraints(
+                                                  const ResultPtr& theFeatureBaseResult,
+                                                  const std::list<AttributePtr>& theRefsToFeature)
 {
-  std::shared_ptr<GeomAPI_Dir2d> aDirT(new GeomAPI_Dir2d(-theDirLine->y(), theDirLine->x()));
-  std::shared_ptr<GeomAPI_XY> aPnt;
-  double aDirNorm2 = theDirLine->dot(theDirLine);
-  double aRad = 0.0;
-  double aDirX = theDirLine->x();
-  double aDirX2 = theDirLine->x() * theDirLine->x();
-  double aDirY2 = theDirLine->y() * theDirLine->y();
-  double aDirXY = theDirLine->x() * theDirLine->y();
-  for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
-    aPnt = theStartLine->added(aDirT->xy()->multiplied(aStepA * theRadius));
-    double aCoeff = aDirT->xy()->dot(aPnt->decreased(theCenterArc));
-    double aCoeff2 = aCoeff * aCoeff;
-    for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
-      aRad = theRadiusArc + aStepB * theRadius;
-      double aD = aRad * aRad * aDirNorm2 - aCoeff2;
-      if (aD < 0.0)
-        continue;
-      double aDs = sqrt(aD);
-      double x1 = theCenterArc->x() + (aCoeff * aDirT->x() - aDirT->y() * aDs) / aDirNorm2;
-      double x2 = theCenterArc->x() + (aCoeff * aDirT->x() + aDirT->y() * aDs) / aDirNorm2;
-      double y1 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
-          aDirXY * (aPnt->x() - theCenterArc->x()) - theDirLine->y() * aDs) / aDirNorm2;
-      double y2 = (aDirX2 * aPnt->y() + aDirY2 * theCenterArc->y() -
-          aDirXY * (aPnt->x() - theCenterArc->x()) + theDirLine->y() * aDs) / aDirNorm2;
-
-      std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
-      theCenters.push_back(aPoint1);
-      std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
-      theCenters.push_back(aPoint2);
-    }
+  std::list<AttributePtr>::const_iterator anIt = theRefsToFeature.begin(),
+                                          aLast = theRefsToFeature.end();
+  for (; anIt != aLast; anIt++) {
+    AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(*anIt);
+    if (aRefAttr.get())
+      aRefAttr->setObject(theFeatureBaseResult);
   }
 }
 
-/// \brief Find intersections of two circles with extended radii
-void possibleFilletCenterArcArc(
-    std::shared_ptr<GeomAPI_XY> theCenterA, double theRadiusA,
-    std::shared_ptr<GeomAPI_XY> theCenterB, double theRadiusB,
-    double theRadius, std::list< std::shared_ptr<GeomAPI_XY> >& theCenters)
+void SketchPlugin_ConstraintSplit::updateRefAttConstraints(
+                    const std::map<AttributePtr, std::list<AttributePtr> >& theBaseRefAttributes,
+                    const std::set<std::pair<AttributePtr, AttributePtr> >& theModifiedAttributes)
 {
-  std::shared_ptr<GeomAPI_XY> aCenterDir = theCenterB->decreased(theCenterA);
-  double aCenterDist2 = aCenterDir->dot(aCenterDir);
-  double aCenterDist = sqrt(aCenterDist2);
-
-  double aRadA, aRadB;
-  for (double aStepA = -1.0; aStepA <= 1.0; aStepA += 2.0) {
-    aRadA = theRadiusA + aStepA * theRadius;
-    for (double aStepB = -1.0; aStepB <= 1.0; aStepB += 2.0) {
-      aRadB = theRadiusB + aStepB * theRadius;
-      if (aRadA + aRadB < aCenterDist || fabs(aRadA - aRadB) > aCenterDist)
-        continue; // there is no intersections
-
-      double aMedDist = (aRadA * aRadA - aRadB * aRadB + aCenterDist2) / (2.0 * aCenterDist);
-      double aHeight = sqrt(aRadA * aRadA - aMedDist * aMedDist);
-
-      double x1 = theCenterA->x() + (aMedDist * aCenterDir->x() + aCenterDir->y() * aHeight) / aCenterDist;
-      double y1 = theCenterA->y() + (aMedDist * aCenterDir->y() - aCenterDir->x() * aHeight) / aCenterDist;
-
-      double x2 = theCenterA->x() + (aMedDist * aCenterDir->x() - aCenterDir->y() * aHeight) / aCenterDist;
-      double y2 = theCenterA->y() + (aMedDist * aCenterDir->y() + aCenterDir->x() * aHeight) / aCenterDist;
-
-      std::shared_ptr<GeomAPI_XY> aPoint1(new GeomAPI_XY(x1, y1));
-      theCenters.push_back(aPoint1);
-      std::shared_ptr<GeomAPI_XY> aPoint2(new GeomAPI_XY(x2, y2));
-      theCenters.push_back(aPoint2);
+#ifdef DEBUG_SPLIT
+  std::cout << "SketchPlugin_ConstraintSplit::updateRefAttConstraints" << std::endl;
+#endif
+
+  std::set<std::pair<AttributePtr, AttributePtr> >::const_iterator
+    anIt = theModifiedAttributes.begin(),  aLast = theModifiedAttributes.end();
+  for (; anIt != aLast; anIt++) {
+    AttributePtr anAttribute = anIt->first;
+
+    /// not found in references
+    if (theBaseRefAttributes.find(anAttribute) == theBaseRefAttributes.end())
+      continue;
+    std::list<AttributePtr> aRefAttributes = theBaseRefAttributes.at(anAttribute);
+    std::list<AttributePtr>::const_iterator aRefIt = aRefAttributes.begin(),
+                                            aRLast = aRefAttributes.end();
+
+    AttributePtr aNewAttribute = anIt->second;
+    for (; aRefIt != aRLast; aRefIt++) {
+      AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(*aRefIt);
+      if (aRefAttr.get()) {
+        aRefAttr->setAttr(aNewAttribute);
+#ifdef DEBUG_SPLIT
+        FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->owner());
+        std::cout << " -" << getFeatureInfo(aFeature) << std::endl;
+#endif
+      }
     }
   }
 }
 
-void calculateFilletCenter(FeaturePtr theFeatureA, FeaturePtr theFeatureB,
-                           double theRadius, bool theNotInversed[2],
-                           std::shared_ptr<GeomAPI_XY>& theCenter,
-                           std::shared_ptr<GeomAPI_XY>& theTangentA,
-                           std::shared_ptr<GeomAPI_XY>& theTangentB)
+void SketchPlugin_ConstraintSplit::splitLine(FeaturePtr& theSplitFeature,
+                                             FeaturePtr& theBaseFeatureModified,
+                                             FeaturePtr& theAfterFeature,
+                                             std::set<AttributePoint2DPtr>& thePoints,
+                                             std::set<FeaturePtr>& theCreatedFeatures,
+                 std::set<std::pair<AttributePtr, AttributePtr>>& theModifiedAttributes)
 {
-  static const int aNbFeatures = 2;
-  FeaturePtr aFeature[aNbFeatures] = {theFeatureA, theFeatureB};
-  std::shared_ptr<GeomAPI_XY> aStart[aNbFeatures], aEnd[aNbFeatures], aCenter[aNbFeatures];
-  std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, aEndPoint;
-
-  for (int i = 0; i < aNbFeatures; i++) {
-    if (aFeature[i]->getKind() == SketchPlugin_Line::ID()) {
-      aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aFeature[i]->attribute(SketchPlugin_Line::START_ID()));
-      aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aFeature[i]->attribute(SketchPlugin_Line::END_ID()));
-    } else if (aFeature[i]->getKind() == SketchPlugin_Arc::ID()) {
-      aStartPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aFeature[i]->attribute(SketchPlugin_Arc::START_ID()));
-      aEndPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aFeature[i]->attribute(SketchPlugin_Arc::END_ID()));
-      aCenter[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-          aFeature[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt()->xy();
-    } else
-      return;
-    aStart[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
-        new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()) :
-        new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()));
-    aEnd[i] = std::shared_ptr<GeomAPI_XY>(theNotInversed[i] ?
-        new GeomAPI_XY(aEndPoint->x(), aEndPoint->y()) :
-        new GeomAPI_XY(aStartPoint->x(), aStartPoint->y()));
+  std::set<FeaturePtr> aCreatedFeatures;
+  FeaturePtr aConstraintFeature;
+  theBaseFeatureModified = FeaturePtr(); // it will contain modified base feature
+
+  SketchPlugin_Sketch* aSketch = sketch();
+  if (!aSketch)
+    return;
+
+  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
+                                           data()->attribute(SketchPlugin_Constraint::VALUE()));
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  std::string aFeatureKind = aBaseFeature->getKind();
+  if (aFeatureKind != SketchPlugin_Line::ID())
+    return;
+
+  AttributePoint2DPtr aFirstPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  AttributePoint2DPtr aSecondPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
+  AttributePoint2DPtr aStartPointAttrOfBase, anEndPointAttrOfBase;
+
+  getFeaturePoints(aBaseFeature, aStartPointAttrOfBase, anEndPointAttrOfBase);
+  if (!aStartPointAttrOfBase.get() && !anEndPointAttrOfBase.get()) {
+    setError("Error: Feature has no start and end points.");
+    return;
   }
 
-  if (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
-      theFeatureB->getKind() == SketchPlugin_Line::ID()) {
-    std::shared_ptr<GeomAPI_Dir2d> aDir[2];
-    std::shared_ptr<GeomAPI_Dir2d> aDirT[2];
-    for (int i = 0; i < aNbFeatures; i++) {
-      aDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aEnd[i]->decreased(aStart[i])));
-      aDirT[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aDir[i]->y(), aDir[i]->x()));
-    }
+  arrangePointsOnLine(aStartPointAttrOfBase, anEndPointAttrOfBase,
+                      aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+
+#ifdef DEBUG_SPLIT
+  std::cout << "Arranged points (to build split between 1st and 2nd points:" << std::endl;
+  std::cout << "Start point: " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aStartPointAttrOfBase) << std::endl;
+  std::cout << "1st point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aFirstPointAttrOfSplit) << std::endl;
+  std::cout << "2nd point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aSecondPointAttrOfSplit) << std::endl;
+  std::cout << "End point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(anEndPointAttrOfBase) << std::endl;
+#endif
+
+  /// create a split feature
+  theSplitFeature =
+    createLineFeature(aBaseFeature, aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+  theCreatedFeatures.insert(theSplitFeature);
+
+  // before split feature
+  if (aStartPointAttrOfBase->pnt()->isEqual(aFirstPointAttrOfSplit->pnt())) {
+    theModifiedAttributes.insert(std::make_pair(aStartPointAttrOfBase,
+                                        theSplitFeature->attribute(SketchPlugin_Line::START_ID())));
+  }
+  else {
+    theBaseFeatureModified = aBaseFeature; ///< use base feature to store all constraints here
+    /// move end arc point to start of split
+  }
 
-    // get and filter possible centers
-    std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
-    possibleFilletCenterLineLine(aStart[0], aDir[0], aStart[1], aDir[1], theRadius, aSuspectCenters);
-    double aDot = 0.0;
-    std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
-    for (; anIt != aSuspectCenters.end(); anIt++) {
-      aDot = aDirT[0]->xy()->dot(aStart[0]->decreased(*anIt));
-      theTangentA = (*anIt)->added(aDirT[0]->xy()->multiplied(aDot));
-      if (theTangentA->decreased(aStart[0])->dot(aDir[0]->xy()) < 0.0)
-        continue; // incorrect position
-      aDot = aDirT[1]->xy()->dot(aStart[1]->decreased(*anIt));
-      theTangentB = (*anIt)->added(aDirT[1]->xy()->multiplied(aDot));
-      if (theTangentB->decreased(aStart[1])->dot(aDir[1]->xy()) < 0.0)
-        continue; // incorrect position
-      // the center is found, stop searching
-      theCenter = *anIt;
-      return;
-    }
-  } else if ((theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
-      theFeatureB->getKind() == SketchPlugin_Line::ID()) || 
-      (theFeatureA->getKind() == SketchPlugin_Line::ID() &&
-      theFeatureB->getKind() == SketchPlugin_Arc::ID())) {
-    int aLineInd = theFeatureA->getKind() == SketchPlugin_Line::ID() ? 0 : 1;
-    double anArcRadius = aStart[1-aLineInd]->distance(aCenter[1-aLineInd]);
-    std::shared_ptr<GeomAPI_Dir2d> aDirLine = std::shared_ptr<GeomAPI_Dir2d>(
-        new GeomAPI_Dir2d(aEnd[aLineInd]->decreased(aStart[aLineInd])));
-    std::shared_ptr<GeomAPI_Dir2d> aDirT = std::shared_ptr<GeomAPI_Dir2d>(
-        new GeomAPI_Dir2d(-aDirLine->y(), aDirLine->x()));
-
-    std::shared_ptr<GeomAPI_Dir2d> aStartArcDir = std::shared_ptr<GeomAPI_Dir2d>(
-        new GeomAPI_Dir2d(aStart[1-aLineInd]->decreased(aCenter[1-aLineInd])));
-    std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
-        new GeomAPI_Dir2d(aEnd[1-aLineInd]->decreased(aCenter[1-aLineInd])));
-    double anArcAngle = aEndArcDir->angle(aStartArcDir);
-
-    // get possible centers and filter them
-    std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
-    possibleFilletCenterLineArc(aStart[aLineInd], aDirLine, aCenter[1-aLineInd], anArcRadius, theRadius, aSuspectCenters);
-    double aDot = 0.0;
-    // the line is forward into the arc
-    double innerArc = aCenter[1-aLineInd]->decreased(aStart[aLineInd])->dot(aDirLine->xy());
-    std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
-    // The possible centers are ranged by their positions.
-    // If the point is not satisfy one of criteria, the weight is decreased with penalty.
-    int aBestWeight = 0;
-    std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
-    for (; anIt != aSuspectCenters.end(); anIt++) {
-      int aWeight = 2;
-      aDot = aDirT->xy()->dot(aStart[aLineInd]->decreased(*anIt));
-      aLineTgPoint = (*anIt)->added(aDirT->xy()->multiplied(aDot));
-      // Check the point is placed on the correct arc (penalty if false)
-      if (aCenter[1-aLineInd]->distance(*anIt) * innerArc > anArcRadius * innerArc)
-        aWeight -= 1;
-      std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
-          new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1-aLineInd])));
-      double aCurAngle = aCurDir->angle(aStartArcDir);
-      if (anArcAngle < 0.0) aCurAngle *= -1.0;
-      if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle))
-        continue;
-      if (aWeight > aBestWeight)
-        aBestWeight = aWeight;
-      else if (aWeight < aBestWeight ||
-               aStart[aLineInd]->distance(*anIt) >
-               aStart[aLineInd]->distance(theCenter)) // <-- take closer point
-        continue;
-      // the center is found, stop searching
-      theCenter = *anIt;
-      anArcTgPoint = aCenter[1-aLineInd]->added(aCurDir->xy()->multiplied(anArcRadius));
-      if (theFeatureA->getKind() == SketchPlugin_Line::ID()) {
-        theTangentA = aLineTgPoint;
-        theTangentB = anArcTgPoint;
-      } else {
-        theTangentA = anArcTgPoint;
-        theTangentB = aLineTgPoint;
-      }
-      //return;
-    }
-  } else if (theFeatureA->getKind() == SketchPlugin_Arc::ID() &&
-      theFeatureB->getKind() == SketchPlugin_Arc::ID()) {
-    double anArcRadius[aNbFeatures];
-    double anArcAngle[aNbFeatures];
-    std::shared_ptr<GeomAPI_Dir2d> aStartArcDir[aNbFeatures];
-    for (int i = 0; i < aNbFeatures; i++) {
-      anArcRadius[i] = aStart[i]->distance(aCenter[i]);
-      aStartArcDir[i] = std::shared_ptr<GeomAPI_Dir2d>(
-          new GeomAPI_Dir2d(aStart[i]->decreased(aCenter[i])));
-      std::shared_ptr<GeomAPI_Dir2d> aEndArcDir = std::shared_ptr<GeomAPI_Dir2d>(
-          new GeomAPI_Dir2d(aEnd[i]->decreased(aCenter[i])));
-      anArcAngle[i] = aEndArcDir->angle(aStartArcDir[i]);
+  // after split feature
+  if (!aSecondPointAttrOfSplit->pnt()->isEqual(anEndPointAttrOfBase->pnt())) {
+    FeaturePtr aFeature;
+    if (!theBaseFeatureModified.get()) {
+      aFeature = aBaseFeature; ///< use base feature to store all constraints here
+      fillAttribute(aFeature->attribute(SketchPlugin_Line::START_ID()), aSecondPointAttrOfSplit);
+      aFeature->execute(); // to update result
     }
-
-    // get and filter possible centers
-    std::list< std::shared_ptr<GeomAPI_XY> > aSuspectCenters;
-    possibleFilletCenterArcArc(aCenter[0], anArcRadius[0], aCenter[1], anArcRadius[1], theRadius, aSuspectCenters);
-    double aDot = 0.0;
-    std::shared_ptr<GeomAPI_XY> aLineTgPoint, anArcTgPoint;
-    std::list< std::shared_ptr<GeomAPI_XY> >::iterator anIt = aSuspectCenters.begin();
-    for (; anIt != aSuspectCenters.end(); anIt++) {
-      std::shared_ptr<GeomAPI_Dir2d> aCurDir = std::shared_ptr<GeomAPI_Dir2d>(
-          new GeomAPI_Dir2d((*anIt)->decreased(aCenter[0])));
-      double aCurAngle = aCurDir->angle(aStartArcDir[0]);
-      if (anArcAngle[0] < 0.0) aCurAngle *= -1.0;
-      if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[0]))
-        continue; // incorrect position
-      theTangentA = aCenter[0]->added(aCurDir->xy()->multiplied(anArcRadius[0]));
-
-      aCurDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d((*anIt)->decreased(aCenter[1])));
-      aCurAngle = aCurDir->angle(aStartArcDir[1]);
-      if (anArcAngle[1] < 0.0) aCurAngle *= -1.0;
-      if (aCurAngle < 0.0 || aCurAngle > fabs(anArcAngle[1]))
-        continue; // incorrect position
-      theTangentB = aCenter[1]->added(aCurDir->xy()->multiplied(anArcRadius[1]));
-
-      // the center is found, stop searching
-      theCenter = *anIt;
-      return;
+    else {
+      aFeature = createLineFeature(aBaseFeature, aSecondPointAttrOfSplit, anEndPointAttrOfBase);
+      theCreatedFeatures.insert(aFeature);
+      theModifiedAttributes.insert(std::make_pair(anEndPointAttrOfBase,
+                                             aFeature->attribute(SketchPlugin_Line::END_ID())));
     }
+    aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theSplitFeature->attribute(SketchPlugin_Line::END_ID()),
+                     aFeature->attribute(SketchPlugin_Line::START_ID()));
+    theCreatedFeatures.insert(aConstraintFeature);
+
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                (aFeature->attribute(SketchPlugin_Line::START_ID())));
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                (aFeature->attribute(SketchPlugin_Line::END_ID())));
+
+    if (!theBaseFeatureModified.get())
+      theBaseFeatureModified = aFeature;
+    else
+      theAfterFeature = aFeature;
+  }
+  else {
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                  (theSplitFeature->attribute(SketchPlugin_Line::END_ID())));
+    theModifiedAttributes.insert(std::make_pair(anEndPointAttrOfBase,
+                                   theSplitFeature->attribute(SketchPlugin_Line::END_ID())));
+  }
+  // base split, that is defined before split feature should be changed at end
+  // (after the after feature creation). Otherwise modified value will be used in after feature
+  // before split feature
+  if (!aStartPointAttrOfBase->pnt()->isEqual(aFirstPointAttrOfSplit->pnt())) {
+    /// move end arc point to start of split
+    fillAttribute(theBaseFeatureModified->attribute(SketchPlugin_Line::END_ID()),
+                                                    aFirstPointAttrOfSplit);
+    theBaseFeatureModified->execute(); // to update result
+    aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theBaseFeatureModified->attribute(SketchPlugin_Line::END_ID()),
+                     theSplitFeature->attribute(SketchPlugin_Line::START_ID()));
+    theCreatedFeatures.insert(aConstraintFeature);
+
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                             (theBaseFeatureModified->attribute(SketchPlugin_Line::START_ID())));
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                               (theBaseFeatureModified->attribute(SketchPlugin_Line::END_ID())));
+  }
+  else
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                       (theSplitFeature->attribute(SketchPlugin_Line::START_ID())));
+
+  // additional constraints between split and base features
+  aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintParallel::ID(),
+                                                       getFeatureResult(aBaseFeature),
+                                                       getFeatureResult(theSplitFeature));
+  theCreatedFeatures.insert(aConstraintFeature);
+  if (theAfterFeature.get()) {
+    aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintParallel::ID(),
+                                                    getFeatureResult(aBaseFeature),
+                                                    getFeatureResult(theAfterFeature));
+    theCreatedFeatures.insert(aConstraintFeature);
   }
 }
 
-void getPointOnEdge(const FeaturePtr theFeature,
-                    const std::shared_ptr<GeomAPI_Pnt2d> theFilletPoint,
-                    std::shared_ptr<GeomAPI_Pnt2d>& thePoint) {
-  if(theFeature->getKind() == SketchPlugin_Line::ID()) {
-    std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
-    if(aPntStart->distance(theFilletPoint) > 1.e-7) {
-      aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-        theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
-      aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-        theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
-    }
-    thePoint.reset( new GeomAPI_Pnt2d(aPntStart->xy()->added( aPntEnd->xy()->decreased( aPntStart->xy() )->multiplied(1.0 / 3.0) ) ) );
-  } else {
-    std::shared_ptr<GeomAPI_Pnt2d> aPntTemp;
-    std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
-    if(theFeature->attribute(SketchPlugin_Arc::INVERSED_ID())) {
-      aPntTemp = aPntStart;
-      aPntStart = aPntEnd;
-      aPntEnd = aPntTemp;
+void SketchPlugin_ConstraintSplit::splitArc(FeaturePtr& theSplitFeature,
+                                            FeaturePtr& theBaseFeatureModified,
+                                            FeaturePtr& theAfterFeature,
+                                            std::set<AttributePoint2DPtr>& thePoints,
+                                            std::set<FeaturePtr>& theCreatedFeatures,
+                 std::set<std::pair<AttributePtr, AttributePtr>>& theModifiedAttributes)
+{
+  std::set<FeaturePtr> aCreatedFeatures;
+  FeaturePtr aConstraintFeature;
+  theBaseFeatureModified = FeaturePtr(); // it will contain modified base feature
+
+  SketchPlugin_Sketch* aSketch = sketch();
+  if (!aSketch)
+    return;
+
+  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
+                                           data()->attribute(SketchPlugin_Constraint::VALUE()));
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  std::string aFeatureKind = aBaseFeature->getKind();
+  if (aFeatureKind != SketchPlugin_Arc::ID())
+    return;
+
+  AttributePoint2DPtr aFirstPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  AttributePoint2DPtr aSecondPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
+  AttributePoint2DPtr aStartPointAttrOfBase, anEndPointAttrOfBase;
+  getFeaturePoints(aBaseFeature, aStartPointAttrOfBase, anEndPointAttrOfBase);
+  if (!aStartPointAttrOfBase.get() && !anEndPointAttrOfBase.get()) {
+    setError("Error: Feature has no start and end points.");
+    return;
+  }
+
+  // manually change type of arc to avoid incorrect self-constrainting of the tangent arc
+  aBaseFeature->string(SketchPlugin_Arc::ARC_TYPE())->setValue(
+      SketchPlugin_Arc::ARC_TYPE_CENTER_START_END());
+
+  arrangePointsOnArc(aBaseFeature, aStartPointAttrOfBase, anEndPointAttrOfBase,
+                     aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+#ifdef DEBUG_SPLIT
+  std::cout << "Arranged points (to build split between 1st and 2nd points:" << std::endl;
+  std::cout << "Start point: " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aStartPointAttrOfBase) << std::endl;
+  std::cout << "1st point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aFirstPointAttrOfSplit) << std::endl;
+  std::cout << "2nd point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(aSecondPointAttrOfSplit) << std::endl;
+  std::cout << "End point:   " <<
+    ModelGeomAlgo_Point2D::getPointAttributeInfo(anEndPointAttrOfBase) << std::endl;
+#endif
+
+  /// split feature
+  theSplitFeature = createArcFeature(aBaseFeature, aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+  theCreatedFeatures.insert(theSplitFeature);
+
+  // before split feature
+  if (aStartPointAttrOfBase->pnt()->isEqual(aFirstPointAttrOfSplit->pnt())) {
+    theModifiedAttributes.insert(std::make_pair(aStartPointAttrOfBase,
+                                  theSplitFeature->attribute(SketchPlugin_Arc::START_ID())));
+  }
+  else {
+    theBaseFeatureModified = aBaseFeature; ///< use base feature to store all constraints here
+    /// move end arc point to start of split
+  }
+
+  // after split feature
+  if (!aSecondPointAttrOfSplit->pnt()->isEqual(anEndPointAttrOfBase->pnt())) {
+    FeaturePtr aFeature;
+    if (!theBaseFeatureModified.get()) {
+      aFeature = aBaseFeature; ///< use base feature to store all constraints here
+      fillAttribute(aFeature->attribute(SketchPlugin_Arc::START_ID()), aSecondPointAttrOfSplit);
+      aFeature->execute(); // to update result
     }
-    std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
-    double aStartParameter(0), anEndParameter(0);
-    aCirc->parameter(aPntStart, paramTolerance, aStartParameter);
-    aCirc->parameter(aPntEnd, paramTolerance, anEndParameter);
-    if(aPntStart->distance(theFilletPoint) > tolerance) {
-      double aTmpParameter = aStartParameter;
-      aStartParameter = anEndParameter;
-      anEndParameter = aTmpParameter;
+    else {
+      aFeature = createArcFeature(aBaseFeature, aSecondPointAttrOfSplit, anEndPointAttrOfBase);
+      theCreatedFeatures.insert(aFeature);
+      theModifiedAttributes.insert(std::make_pair(anEndPointAttrOfBase,
+                                                  aFeature->attribute(SketchPlugin_Arc::END_ID())));
     }
-    double aPntParameter = aStartParameter + (anEndParameter - aStartParameter) / 3.0;
-    aCirc->D0(aPntParameter, thePoint);
+    aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theSplitFeature->attribute(SketchPlugin_Arc::END_ID()),
+                     aFeature->attribute(SketchPlugin_Arc::START_ID()));
+    theCreatedFeatures.insert(aConstraintFeature);
+
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                (aFeature->attribute(SketchPlugin_Arc::START_ID())));
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                (aFeature->attribute(SketchPlugin_Arc::END_ID())));
+
+    if (!theBaseFeatureModified.get())
+      theBaseFeatureModified = aFeature;
+    else
+      theAfterFeature = aFeature;
+  }
+  else {
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                  (theSplitFeature->attribute(SketchPlugin_Arc::END_ID())));
+    theModifiedAttributes.insert(std::make_pair(anEndPointAttrOfBase,
+                                   theSplitFeature->attribute(SketchPlugin_Arc::END_ID())));
+  }
+  // base split, that is defined before split feature should be changed at end
+  // (after the after feature creation). Otherwise modified value will be used in after feature
+  // before split feature
+  if (!aStartPointAttrOfBase->pnt()->isEqual(aFirstPointAttrOfSplit->pnt())) {
+    /// move end arc point to start of split
+    fillAttribute(theBaseFeatureModified->attribute(SketchPlugin_Arc::END_ID()),
+                                                    aFirstPointAttrOfSplit);
+    theBaseFeatureModified->execute(); // to update result
+    aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theBaseFeatureModified->attribute(SketchPlugin_Arc::END_ID()),
+                     theSplitFeature->attribute(SketchPlugin_Arc::START_ID()));
+    theCreatedFeatures.insert(aConstraintFeature);
+
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                             (theBaseFeatureModified->attribute(SketchPlugin_Arc::START_ID())));
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                               (theBaseFeatureModified->attribute(SketchPlugin_Arc::END_ID())));
+  }
+  else
+    thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                                       (theSplitFeature->attribute(SketchPlugin_Arc::START_ID())));
+
+  // additional constraints between split and base features
+  aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintEqual::ID(),
+                                                       getFeatureResult(aBaseFeature),
+                                                       getFeatureResult(theSplitFeature));
+  theCreatedFeatures.insert(aConstraintFeature);
+  aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintTangent::ID(),
+                                                       getFeatureResult(theSplitFeature),
+                                                       getFeatureResult(aBaseFeature));
+  theCreatedFeatures.insert(aConstraintFeature);
+  if (theAfterFeature.get()) {
+    aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintEqual::ID(),
+                                                    getFeatureResult(aBaseFeature),
+                                                    getFeatureResult(theAfterFeature));
+    theCreatedFeatures.insert(aConstraintFeature);
+    aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintTangent::ID(),
+                                                    getFeatureResult(theSplitFeature),
+                                                    getFeatureResult(theAfterFeature));
+    theCreatedFeatures.insert(aConstraintFeature);
   }
 }
 
-double getProjectionDistance(const FeaturePtr theFeature,
-                             const std::shared_ptr<GeomAPI_Pnt2d> thePoint)
+void SketchPlugin_ConstraintSplit::splitCircle(FeaturePtr& theSplitFeature,
+                                               FeaturePtr& theBaseFeatureModified,
+                                               FeaturePtr& theAfterFeature,
+                                               std::set<AttributePoint2DPtr>& thePoints,
+                                               std::set<FeaturePtr>& theCreatedFeatures,
+                 std::set<std::pair<AttributePtr, AttributePtr>>& theModifiedAttributes)
 {
-  std::shared_ptr<GeomAPI_Pnt2d> aProjectPnt;
-  if(theFeature->getKind() == SketchPlugin_Line::ID()) {
-    std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Line::START_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Line::END_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Lin2d> aLin(new GeomAPI_Lin2d(aPntStart, aPntEnd));
-    aProjectPnt = aLin->project(thePoint);
-  } else {
-    std::shared_ptr<GeomAPI_Pnt2d> aPntStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::START_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Pnt2d> aPntEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::END_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Pnt2d> aCenterPnt = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-      theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
-    std::shared_ptr<GeomAPI_Circ2d> aCirc(new GeomAPI_Circ2d(aCenterPnt, aPntStart));
-    aProjectPnt = aCirc->project(thePoint);
-  }
-  if(aProjectPnt.get()) {
-    return aProjectPnt->distance(thePoint);
-  }
-  return -1;
+  std::set<FeaturePtr> aCreatedFeatures;
+  FeaturePtr aConstraintFeature;
+  theBaseFeatureModified = FeaturePtr(); // it will contain modified base feature
+
+  SketchPlugin_Sketch* aSketch = sketch();
+  if (!aSketch)
+    return;
+
+  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
+                                           data()->attribute(SketchPlugin_Constraint::VALUE()));
+  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  std::string aFeatureKind = aBaseFeature->getKind();
+  if (aFeatureKind != SketchPlugin_Circle::ID())
+    return;
+
+  AttributePoint2DPtr aFirstPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  AttributePoint2DPtr aSecondPointAttrOfSplit =
+    getPointOfRefAttr(data()->attribute(SketchPlugin_Constraint::ENTITY_B()));
+
+  /// split feature
+  theSplitFeature =
+    createArcFeature(aBaseFeature, aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+  bool aSplitReversed = std::dynamic_pointer_cast<SketchPlugin_Arc>(theSplitFeature)->isReversed();
+  theCreatedFeatures.insert(theSplitFeature);
+
+  /// base feature is a left part of the circle
+  theBaseFeatureModified = createArcFeature(aBaseFeature,
+    aFirstPointAttrOfSplit, aSecondPointAttrOfSplit);
+  std::dynamic_pointer_cast<SketchPlugin_Arc>(
+    theBaseFeatureModified)->setReversed(!aSplitReversed);
+  theBaseFeatureModified->execute();
+
+  theModifiedAttributes.insert(
+    std::make_pair(aBaseFeature->attribute(SketchPlugin_Circle::CENTER_ID()),
+                  theBaseFeatureModified->attribute(SketchPlugin_Arc::CENTER_ID())));
+
+  theCreatedFeatures.insert(theBaseFeatureModified);
+
+  thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                             (theBaseFeatureModified->attribute(SketchPlugin_Arc::START_ID())));
+  thePoints.insert(std::dynamic_pointer_cast<GeomDataAPI_Point2D>
+                             (theBaseFeatureModified->attribute(SketchPlugin_Arc::END_ID())));
+
+  // additional constraints between split and base features
+  aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theBaseFeatureModified->attribute(SketchPlugin_Arc::END_ID()),
+                     theSplitFeature->attribute(SketchPlugin_Arc::END_ID()));
+  theCreatedFeatures.insert(aConstraintFeature);
+  aConstraintFeature = createConstraint(SketchPlugin_ConstraintCoincidence::ID(),
+                     theBaseFeatureModified->attribute(SketchPlugin_Arc::START_ID()),
+                     theSplitFeature->attribute(SketchPlugin_Arc::START_ID()));
+  theCreatedFeatures.insert(aConstraintFeature);
+
+  aConstraintFeature = createConstraintForObjects(SketchPlugin_ConstraintTangent::ID(),
+                                                       getFeatureResult(theSplitFeature),
+                                                       getFeatureResult(theBaseFeatureModified));
+  theCreatedFeatures.insert(aConstraintFeature);
 }
 
-std::set<FeaturePtr> getCoincides(const FeaturePtr& theConstraintCoincidence)
+void SketchPlugin_ConstraintSplit::arrangePointsOnLine(
+    const AttributePoint2DPtr& theStartPointAttr,
+    const AttributePoint2DPtr& theEndPointAttr,
+    AttributePoint2DPtr& theFirstPointAttr,
+    AttributePoint2DPtr& theLastPointAttr) const
 {
-  std::set<FeaturePtr> aCoincides;
-
-  std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt = SketchPlugin_Tools::getCoincidencePoint(theConstraintCoincidence);
-
-  SketchPlugin_Tools::findCoincidences(theConstraintCoincidence,
-                                       SketchPlugin_ConstraintCoincidence::ENTITY_A(),
-                                       aCoincides);
-  SketchPlugin_Tools::findCoincidences(theConstraintCoincidence,
-                                       SketchPlugin_ConstraintCoincidence::ENTITY_B(),
-                                       aCoincides);
-
-  // Remove points from set of coincides.
-  std::set<FeaturePtr> aNewSetOfCoincides;
-  for(std::set<FeaturePtr>::iterator anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
-    if((*anIt)->getKind() == SketchPlugin_Line::ID()) {
-      aNewSetOfCoincides.insert(*anIt);
-    } else if((*anIt)->getKind() == SketchPlugin_Arc::ID()) {
-      AttributePtr anAttrCenter = (*anIt)->attribute(SketchPlugin_Arc::CENTER_ID());
-      std::shared_ptr<GeomDataAPI_Point2D> aPointCenter2D =
-        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttrCenter);
-      if(aPointCenter2D.get() && aFilletPnt->isEqual(aPointCenter2D->pnt())) {
-        continue;
-      }
-      aNewSetOfCoincides.insert(*anIt);
-    }
+  // if first point is closer to last point, swap first and last values
+  if (theStartPointAttr->pnt()->distance(theFirstPointAttr->pnt()) >
+      theStartPointAttr->pnt()->distance(theLastPointAttr->pnt())) {
+    AttributePoint2DPtr aTmpPoint = theFirstPointAttr;
+    theFirstPointAttr = theLastPointAttr;
+    theLastPointAttr = aTmpPoint;
   }
-  aCoincides = aNewSetOfCoincides;
-
-  // If we still have more than two coincides remove auxilary entities from set of coincides.
-  if(aCoincides.size() > 2) {
-    aNewSetOfCoincides.clear();
-    for(std::set<FeaturePtr>::iterator anIt = aCoincides.begin(); anIt != aCoincides.end(); ++anIt) {
-      if(!(*anIt)->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value()) {
-        aNewSetOfCoincides.insert(*anIt);
-      }
-    }
-    aCoincides = aNewSetOfCoincides;
+}
+
+void SketchPlugin_ConstraintSplit::arrangePointsOnArc(
+    const FeaturePtr& theArc,
+    const std::shared_ptr<GeomDataAPI_Point2D>& theStartPointAttr,
+    const std::shared_ptr<GeomDataAPI_Point2D>& theEndPointAttr,
+    std::shared_ptr<GeomDataAPI_Point2D>& theFirstPointAttr,
+    std::shared_ptr<GeomDataAPI_Point2D>& theSecondPointAttr) const
+{
+  static const double anAngleTol = 1.e-12;
+
+  std::shared_ptr<GeomAPI_Pnt2d> aCenter = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+      theArc->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
+  bool isReversed = theArc->boolean(SketchPlugin_Arc::INVERSED_ID())->value();
+
+  // collect directions to each point
+  std::shared_ptr<GeomAPI_Dir2d> aStartDir(
+      new GeomAPI_Dir2d(theStartPointAttr->pnt()->xy()->decreased(aCenter->xy())));
+  std::shared_ptr<GeomAPI_Dir2d> aFirstPtDir(
+      new GeomAPI_Dir2d(theFirstPointAttr->pnt()->xy()->decreased(aCenter->xy())));
+  std::shared_ptr<GeomAPI_Dir2d> aSecondPtDir(
+      new GeomAPI_Dir2d(theSecondPointAttr->pnt()->xy()->decreased(aCenter->xy())));
+
+  // sort points by their angular values
+  double aFirstPtAngle = aStartDir->angle(aFirstPtDir);
+  double aSecondPtAngle = aStartDir->angle(aSecondPtDir);
+  double aPeriod = isReversed ? -2.0 * PI : 2.0 * PI;
+  if (fabs(aFirstPtAngle) > anAngleTol && isReversed == (aFirstPtAngle > 0.))
+    aFirstPtAngle += aPeriod;
+  if (fabs(aSecondPtAngle) > anAngleTol && isReversed == (aSecondPtAngle > 0.))
+    aSecondPtAngle += aPeriod;
+
+  if (fabs(aFirstPtAngle) > fabs(aSecondPtAngle)) {
+    AttributePoint2DPtr aTmpPoint = theFirstPointAttr;
+    theFirstPointAttr = theSecondPointAttr;
+    theSecondPointAttr = aTmpPoint;
   }
+}
 
-  return aCoincides;
+void SketchPlugin_ConstraintSplit::fillAttribute(const AttributePtr& theModifiedAttribute,
+                                                 const AttributePtr& theSourceAttribute)
+{
+  AttributePoint2DPtr aModifiedAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+                                            theModifiedAttribute);
+  AttributePoint2DPtr aSourceAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
+                                            theSourceAttribute);
+
+  if (aModifiedAttribute.get() && aSourceAttribute.get())
+    aModifiedAttribute->setValue(aSourceAttribute->pnt());
 }
-*/
 
-std::shared_ptr<GeomDataAPI_Point2D> SketchPlugin_ConstraintSplit::getPointOfRefAttr(
-                                                                  const AttributePtr& theAttribute)
+FeaturePtr SketchPlugin_ConstraintSplit::createLineFeature(const FeaturePtr& theBaseFeature,
+                                                           const AttributePtr& theFirstPointAttr,
+                                                           const AttributePtr& theSecondPointAttr)
 {
-  AttributePoint2DPtr aPointAttribute;
+  FeaturePtr aFeature;
+  SketchPlugin_Sketch* aSketch = sketch();
+  if (!aSketch || !theBaseFeature.get())
+    return aFeature;
 
-  if (theAttribute->id() == ModelAPI_AttributeRefAttr::typeId()) {
-    AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(theAttribute);
-    if (aRefAttr.get() && aRefAttr->isInitialized()) {
-      AttributePtr anAttribute = aRefAttr->attr();
-      if (anAttribute.get() && anAttribute->id() == GeomDataAPI_Point2D::typeId())
-        aPointAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(anAttribute);
-    }
+  aFeature = aSketch->addFeature(SketchPlugin_Line::ID());
+
+  fillAttribute(aFeature->attribute(SketchPlugin_Line::START_ID()), theFirstPointAttr);
+  fillAttribute(aFeature->attribute(SketchPlugin_Line::END_ID()), theSecondPointAttr);
+  aFeature->execute(); // to obtain result
+
+  return aFeature;
+}
+
+FeaturePtr SketchPlugin_ConstraintSplit::createArcFeature(const FeaturePtr& theBaseFeature,
+                                                          const AttributePtr& theFirstPointAttr,
+                                                          const AttributePtr& theSecondPointAttr)
+{
+  FeaturePtr aFeature;
+  SketchPlugin_Sketch* aSketch = sketch();
+  if (!aSketch || !theBaseFeature.get())
+    return aFeature;
+
+  std::string aCenterAttributeId;
+  if (theBaseFeature->getKind() == SketchPlugin_Arc::ID())
+    aCenterAttributeId = SketchPlugin_Arc::CENTER_ID();
+  else if (theBaseFeature->getKind() == SketchPlugin_Circle::ID())
+    aCenterAttributeId = SketchPlugin_Circle::CENTER_ID();
+
+  if (aCenterAttributeId.empty())
+    return aFeature;
+
+  aFeature = aSketch->addFeature(SketchPlugin_Arc::ID());
+  // update fillet arc: make the arc correct for sure, so, it is not needed to process
+  // the "attribute updated"
+  // by arc; moreover, it may cause cyclicity in hte mechanism of updater
+  aFeature->data()->blockSendAttributeUpdated(true);
+
+  aFeature->string(SketchPlugin_Arc::ARC_TYPE())->setValue(
+                SketchPlugin_Arc::ARC_TYPE_CENTER_START_END());
+
+  fillAttribute(aFeature->attribute(SketchPlugin_Arc::CENTER_ID()),
+                theBaseFeature->attribute(aCenterAttributeId));
+  fillAttribute(aFeature->attribute(SketchPlugin_Arc::START_ID()), theFirstPointAttr);
+  fillAttribute(aFeature->attribute(SketchPlugin_Arc::END_ID()), theSecondPointAttr);
+
+  /// fill referersed state of created arc as it is on the base arc
+  if (theBaseFeature->getKind() == SketchPlugin_Arc::ID()) {
+    bool aReversed = theBaseFeature->boolean(SketchPlugin_Arc::INVERSED_ID())->value();
+    aFeature->boolean(SketchPlugin_Arc::INVERSED_ID())->setValue(aReversed);
   }
-  return aPointAttribute;
+  aFeature->data()->blockSendAttributeUpdated(false);
+  aFeature->execute(); // to obtain result
+
+  return aFeature;
 }
 
-AttributePoint2DPtr SketchPlugin_ConstraintSplit::getFeaturePoint(const bool& theStartPoint)
+FeaturePtr SketchPlugin_ConstraintSplit::createConstraint(const std::string& theConstraintId,
+                                                    const AttributePtr& theFirstAttribute,
+                                                    const AttributePtr& theSecondAttribute)
 {
-  AttributePoint2DPtr aPointAttribute;
+  FeaturePtr aConstraint = sketch()->addFeature(theConstraintId);
+  AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+                                 aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  aRefAttr->setAttr(theFirstAttribute);
 
-  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
-                                           data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
-  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+                                 aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
+  aRefAttr->setAttr(theSecondAttribute);
 
-  std::string aFeatureKind = aBaseFeature->getKind();
-  std::string anAttributeName;
-  if (aFeatureKind == SketchPlugin_Line::ID())
-    anAttributeName = theStartPoint ? SketchPlugin_Line::START_ID()
-                                    : SketchPlugin_Line::END_ID();
-  else if (aFeatureKind == SketchPlugin_Arc::ID()) {
-    anAttributeName = theStartPoint ? SketchPlugin_Arc::START_ID()
-                                    : SketchPlugin_Arc::END_ID();
+  return aConstraint;
+}
+
+FeaturePtr SketchPlugin_ConstraintSplit::createConstraintForObjects(
+                                                    const std::string& theConstraintId,
+                                                    const ObjectPtr& theFirstObject,
+                                                    const ObjectPtr& theSecondObject)
+{
+  FeaturePtr aConstraint = sketch()->addFeature(theConstraintId);
+  AttributeRefAttrPtr aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+                                 aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
+  aRefAttr->setObject(theFirstObject);
+
+  aRefAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+                                 aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
+  aRefAttr->setObject(theSecondObject);
+
+  return aConstraint;
+}
+
+void SketchPlugin_ConstraintSplit::updateFeaturesAfterSplit(
+                                                   const std::set<FeaturePtr>& theFeaturesToUpdate)
+{
+  std::set<FeaturePtr>::const_iterator anIt = theFeaturesToUpdate.begin(),
+                                       aLast = theFeaturesToUpdate.end();
+  for (; anIt != aLast; anIt++) {
+    FeaturePtr aRefFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(*anIt);
+    std::string aRefFeatureKind = aRefFeature->getKind();
+    if (aRefFeatureKind == SketchPlugin_ConstraintLength::ID()) {
+      std::shared_ptr<SketchPlugin_ConstraintLength> aLenghtFeature =
+                              std::dynamic_pointer_cast<SketchPlugin_ConstraintLength>(*anIt);
+      if (aLenghtFeature.get()) {
+        std::shared_ptr<ModelAPI_AttributeDouble> aValueAttr = std::dynamic_pointer_cast<
+            ModelAPI_AttributeDouble>(aLenghtFeature->attribute(SketchPlugin_Constraint::VALUE()));
+        double aValue;
+        if (aLenghtFeature->computeLenghtValue(aValue) && aValueAttr.get())
+          aValueAttr->setValue(aValue);
+      }
+    }
   }
-  if (!anAttributeName.empty())
-    aPointAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-                                                         aBaseFeature->attribute(anAttributeName));
-  return aPointAttribute;
 }
 
-FeaturePtr SketchPlugin_ConstraintSplit::createFeature(const AttributePoint2DPtr& theStartPointAttr,
-                                                       const AttributePoint2DPtr& theEndPointAttr)
+std::shared_ptr<ModelAPI_Result> SketchPlugin_ConstraintSplit::getFeatureResult(
+                                    const std::shared_ptr<ModelAPI_Feature>& theFeature)
 {
-  FeaturePtr aFeature;
-/*
-  AttributeReferencePtr aBaseObjectAttr = std::dynamic_pointer_cast<ModelAPI_AttributeReference>(
-                                           data()->attribute(SketchPlugin_Constraint::ENTITY_A()));
-  FeaturePtr aBaseFeature = ModelAPI_Feature::feature(aBaseObjectAttr->value());
+  std::shared_ptr<ModelAPI_Result> aResult;
 
-  std::string aFeatureKind = aBaseFeature->getKind();
-  aFeature = sketch()->addFeature(aFeatureKind);
+  std::string aFeatureKind = theFeature->getKind();
+  if (aFeatureKind == SketchPlugin_Line::ID())
+    aResult = theFeature->firstResult();
+  else if (aFeatureKind == SketchPlugin_Arc::ID())
+    aResult = theFeature->lastResult();
+  else if (aFeatureKind == SketchPlugin_Circle::ID())
+    aResult = theFeature->lastResult();
 
-  if (aFeatureKind == SketchPlugin_Line::ID()) {
-    AttributePoint2DPtr aStartAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-                                              aFeature->attribute(SketchPlugin_Line::START_ID()));
-    aStartAttribute->setValue(theStartPointAttr->pnt());
+  return aResult;
+}
+
+std::set<std::shared_ptr<ModelAPI_Attribute> > SketchPlugin_ConstraintSplit::getEdgeAttributes(
+                                           const std::shared_ptr<ModelAPI_Feature>& theFeature)
+{
+  std::set<std::shared_ptr<ModelAPI_Attribute> > anAttributes;
 
-    AttributePoint2DPtr anEndAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-                                              aFeature->attribute(SketchPlugin_Line::END_ID()));
-    anEndAttribute->setValue(theEndPointAttr->pnt());
+  std::string aFeatureKind = theFeature->getKind();
+  if (aFeatureKind == SketchPlugin_Line::ID()) {
+    anAttributes.insert(theFeature->attribute(SketchPlugin_Line::START_ID()));
+    anAttributes.insert(theFeature->attribute(SketchPlugin_Line::END_ID()));
   }
   else if (aFeatureKind == SketchPlugin_Arc::ID()) {
-    AttributeStringPtr anArcType = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
-             data()->addAttribute(SketchPlugin_Arc::ARC_TYPE(), ModelAPI_AttributeString::typeId()));
+    anAttributes.insert(theFeature->attribute(SketchPlugin_Arc::START_ID()));
+    anAttributes.insert(theFeature->attribute(SketchPlugin_Arc::END_ID()));
+  }
+  else if (aFeatureKind == SketchPlugin_Circle::ID()) {
+  }
 
-    AttributePoint2DPtr aPointAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-                                                  aFeature->attribute(SketchPlugin_Arc::START_ID()));
-    aPointAttribute->setValue(theStartPointAttr->pnt());
+  return anAttributes;
+}
 
-    AttributePoint2DPtr anEndAttribute = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
-                                              aFeature->attribute(SketchPlugin_Arc::END_ID()));
-    anEndAttribute->setValue(theEndPointAttr->pnt());
+#ifdef _DEBUG
+std::string SketchPlugin_ConstraintSplit::getFeatureInfo(
+                                               const std::shared_ptr<ModelAPI_Feature>& theFeature,
+                                               const bool isUseAttributesInfo)
+{
+  std::string anInfo;
+  if (!theFeature.get()) {
+    return "none";
   }
-*/
-  return aFeature;
+
+  if (theFeature->data()->isValid())
+    anInfo.append(theFeature->data()->name().c_str());
+
+  if (isUseAttributesInfo) {
+    std::string aPointsInfo = ModelGeomAlgo_Point2D::getPontAttributesInfo(theFeature,
+                                                             getEdgeAttributes(theFeature));
+    /// processing of feature with point 2d attributes, like line, arc, circle
+    if (!aPointsInfo.empty()) {
+      anInfo += ": ";
+      anInfo += "\n";
+      anInfo += aPointsInfo;
+    }
+    else { /// process constraint coincidence, find points in ref attr attributes
+      std::list<AttributePtr> anAttrs = theFeature->data()->attributes(
+                                                       ModelAPI_AttributeRefAttr::typeId());
+      std::list<AttributePtr>::const_iterator anIt = anAttrs.begin(), aLast = anAttrs.end();
+      std::string anAttributesInfo;
+      for(; anIt != aLast; anIt++) {
+        if (!anAttributesInfo.empty()) {
+          anAttributesInfo.append(", ");
+          anAttributesInfo += "\n";
+        }
+        AttributePtr anAttr = *anIt;
+        std::string aValue = "not defined";
+        std::string aType = anAttr->attributeType();
+        if (aType == ModelAPI_AttributeRefAttr::typeId()) {
+          std::shared_ptr<ModelAPI_AttributeRefAttr> aRefAttr =
+                             std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(anAttr);
+          if (aRefAttr.get()) {
+            if (aRefAttr->isObject()) {
+              FeaturePtr aFeature = ModelAPI_Feature::feature(aRefAttr->object());
+              aValue = "<object:>" + getFeatureInfo(aFeature, false);
+            }
+            else {
+              AttributePtr anAttribute = aRefAttr->attr();
+              if (anAttribute.get()) {
+                FeaturePtr aFeature = ModelAPI_Feature::feature(anAttribute->owner());
+                aValue = "<attr:>" + ModelGeomAlgo_Point2D::getPointAttributeInfo(anAttribute) +
+                         " [" + getFeatureInfo(aFeature, false) + "]";
+              }
+            }
+          }
+        }
+        anAttributesInfo.append("    " + anAttr->id() + ": " + aValue);
+      }
+      if (!anAttributesInfo.empty())
+        anInfo = anInfo + "\n" + anAttributesInfo;
+    }
+  }
+  return anInfo;
 }
+#endif