X-Git-Url: http://git.salome-platform.org/gitweb/?a=blobdiff_plain;f=src%2FSketchPlugin%2FSketchPlugin_Arc.cpp;h=b98a915bf9b7f7bc9c3f519eee17f8106bf6efb5;hb=84b36b8deb02c2661b3d09299560266388329d01;hp=04f2c922babe98d54245f40d28f4b9569af2c29f;hpb=3ada52ad6bce1f69571d9dea97f6631f155681d7;p=modules%2Fshaper.git

diff --git a/src/SketchPlugin/SketchPlugin_Arc.cpp b/src/SketchPlugin/SketchPlugin_Arc.cpp
index 04f2c922b..b98a915bf 100644
--- a/src/SketchPlugin/SketchPlugin_Arc.cpp
+++ b/src/SketchPlugin/SketchPlugin_Arc.cpp
@@ -6,15 +6,30 @@
 
 #include "SketchPlugin_Arc.h"
 #include "SketchPlugin_Sketch.h"
+#include <SketchPlugin_ConstraintCoincidence.h>
+#include <SketchPlugin_ConstraintTangent.h>
+
+#include <Events_Loop.h>
 #include <ModelAPI_Data.h>
 #include <ModelAPI_ResultConstruction.h>
+#include <ModelAPI_AttributeDouble.h>
+#include <ModelAPI_AttributeRefAttr.h>
 #include <ModelAPI_AttributeSelection.h>
+#include <ModelAPI_AttributeString.h>
+#include <ModelAPI_Events.h>
 #include <ModelAPI_Validator.h>
 #include <ModelAPI_Session.h>
+#include <ModelAPI_Tools.h>
 
+#include <GeomAPI_Ax2.h>
 #include <GeomAPI_Circ2d.h>
 #include <GeomAPI_Circ.h>
+#include <GeomAPI_Dir2d.h>
+#include <GeomAPI_Dir.h>
+#include <GeomAPI_Lin2d.h>
+#include <GeomAPI_Lin.h>
 #include <GeomAPI_Pnt2d.h>
+#include <GeomAPI_XY.h>
 #include <GeomDataAPI_Point2D.h>
 #include <GeomDataAPI_Dir.h>
 #include <GeomAlgoAPI_PointBuilder.h>
@@ -24,6 +39,51 @@
 #include <math.h>
 
 const double tolerance = 1e-7;
+const double paramTolerance = 1.e-4;
+const double PI =3.141592653589793238463;
+
+namespace {
+  static const std::string& ARC_TYPE_CENTER_START_END()
+  {
+    static const std::string TYPE("CenterStartEnd");
+    return TYPE;
+  }
+  static const std::string& ARC_TYPE_THREE_POINTS()
+  {
+    static const std::string TYPE("ThreePoints");
+    return TYPE;
+  }
+
+  static const std::string& PASSED_POINT_ID()
+  {
+    static const std::string PASSED_PNT("ArcPassedPoint");
+    return PASSED_PNT;
+  }
+  static const std::string& RADIUS_ID()
+  {
+    static const std::string RADIUS("ArcRadius");
+    return RADIUS;
+  }
+  static const std::string& ANGLE_ID()
+  {
+    static const std::string ANGLE("ArcAngle");
+    return ANGLE;
+  }
+
+  static const std::string& POINT_ID(int theIndex)
+  {
+    switch (theIndex) {
+    case 1: return SketchPlugin_Arc::START_ID();
+    case 2: return SketchPlugin_Arc::END_ID();
+    case 3: return PASSED_POINT_ID();
+    }
+
+    static const std::string DUMMY;
+    return DUMMY;
+  }
+}
+
+
 
 SketchPlugin_Arc::SketchPlugin_Arc()
     : SketchPlugin_SketchEntity()
@@ -33,12 +93,12 @@ SketchPlugin_Arc::SketchPlugin_Arc()
   // default values
   myXEndBefore = 0;
   myYEndBefore = 0;
+
+  myParamBefore = 0;
 }
 
-void SketchPlugin_Arc::initAttributes()
+void SketchPlugin_Arc::initDerivedClassAttributes()
 {
-  SketchPlugin_SketchEntity::initAttributes();
-
   data()->addAttribute(CENTER_ID(), GeomDataAPI_Point2D::typeId());
   data()->addAttribute(START_ID(), GeomDataAPI_Point2D::typeId());
   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
@@ -46,11 +106,27 @@ void SketchPlugin_Arc::initAttributes()
   data()->addAttribute(EXTERNAL_ID(), ModelAPI_AttributeSelection::typeId());
   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), EXTERNAL_ID());
 
+  AttributeBooleanPtr isInversed = std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(
+    data()->addAttribute(INVERSED_ID(), ModelAPI_AttributeBoolean::typeId()));
+
   // get the initial values
   if (anEndAttr->isInitialized()) {
     myXEndBefore = anEndAttr->x();
     myYEndBefore = anEndAttr->y();
   }
+
+  AttributeStringPtr anArcType = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
+    data()->addAttribute(ARC_TYPE(), ModelAPI_AttributeString::typeId()));
+
+  data()->addAttribute(PASSED_POINT_ID(), GeomDataAPI_Point2D::typeId());
+  data()->addAttribute(TANGENT_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
+  data()->addAttribute(RADIUS_ID(), ModelAPI_AttributeDouble::typeId());
+  data()->addAttribute(ANGLE_ID(), ModelAPI_AttributeDouble::typeId());
+
+  // set after all to avoid in attributeChanged reference to not existing attributes
+  if (!isInversed->isInitialized())
+    isInversed->setValue(false);
+  anArcType->setValue(ARC_TYPE_CENTER_START_END());
 }
 
 void SketchPlugin_Arc::execute()
@@ -59,6 +135,8 @@ void SketchPlugin_Arc::execute()
   // result for the arc is set only when all obligatory attributes are initialized,
   // otherwise AIS object is used to visualize the arc's preview
   if (aSketch && isFeatureValid()) {
+    bool hasResult = lastResult().get() != NULL;
+
     // compute a circle point in 3D view
     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
@@ -84,17 +162,37 @@ void SketchPlugin_Arc::execute()
     // compute and change the arc end point
     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
-    /* must be automatically done in attributeChanged
     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
       anEndAttr->setValue(aProjection);
-    */
     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
+    AttributeBooleanPtr isInversed =
+        std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
+
+    std::shared_ptr<GeomAPI_Dir> anXDir(new GeomAPI_Dir(aStartPoint->xyz()->decreased(aCenter->xyz())));
+    std::shared_ptr<GeomAPI_Ax2> anAx2(new GeomAPI_Ax2(aCenter, aNormal, anXDir));
+    std::shared_ptr<GeomAPI_Circ> aCirc(new GeomAPI_Circ(anAx2, aCenter->distance(aStartPoint)));
+    double aParameterNew = 0.0;
+    if(aCirc->parameter(aEndPoint, paramTolerance, aParameterNew)) {
+      if(0 <= myParamBefore && myParamBefore <= PI / 2.0
+        && PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0) {
+          isInversed->setValue(true);
+      } else if(PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0
+        && 0 <= aParameterNew && aParameterNew <= PI / 2.0) {
+          isInversed->setValue(false);
+      }
+    }
+    myParamBefore = aParameterNew;
+
+    std::shared_ptr<GeomAPI_Shape> aCircleShape;
+    if(!isInversed->value()) {
+      aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
+    } else {
+      aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
+    }
 
-    std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
-        aCenter, aStartPoint, aEndPoint, aNormal);
     if (aCircleShape) {
       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
           data(), 1);
@@ -114,11 +212,18 @@ AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
       // compute a circle point in 3D view
       std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
           GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
+
+      std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
       if (aCenterAttr->isInitialized()) {
         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 
         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
+        std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
+            GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
+        AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
+            data()->attribute(ARC_TYPE()));
+
         if (aStartAttr->isInitialized()) {
           // make a visible circle
           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
@@ -127,28 +232,43 @@ AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
           if (aHasPlane) {
             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
-            std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
-                                                            aCenter, aStartPoint, aStartPoint, aNormal);
-            if (aCircleShape) {
-              std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
-              // make a visible point
-              std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
-              aShapes.push_back(aCenterPointShape);
-
-              aShapes.push_back(aCircleShape);
-              if (!aShapes.empty())
-              {
-                std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
-                AISObjectPtr anAIS = thePrevious;
-                if (!anAIS)
-                  anAIS = AISObjectPtr(new GeomAPI_AISObject);
-                anAIS->createShape(aCompound);
-                anAIS->setWidth(3);
-                return anAIS;
+            std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
+            if (aTypeAttr && aTypeAttr->isInitialized() &&
+                aTypeAttr->value() == ARC_TYPE_THREE_POINTS() && aEndAttr->isInitialized() &&
+                aEndAttr->pnt()->distance(aStartAttr->pnt()) > tolerance) {
+              aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
+              std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = 
+                std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
+              if (!aPassedAttr->isInitialized()) { // calculate the appropriate center for the presentation
+                std::shared_ptr<GeomAPI_XY> aDir = 
+                  aEndAttr->pnt()->xy()->decreased(aStartAttr->pnt()->xy())->multiplied(0.5);
+                double x = aDir->x();
+                double y = aDir->y();
+                aDir->setX(x - y);
+                aDir->setY(y + x);
+                std::shared_ptr<GeomAPI_XY> aCenterXY = aStartAttr->pnt()->xy()->added(aDir);
+                aCenter = aSketch->to3D(aCenterXY->x(), aCenterXY->y());
               }
             }
+
+            std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
+                                                            aCenter, aStartPoint, aEndPoint, aNormal);
+            if (aCircleShape)
+              aShapes.push_back(aCircleShape);
           }
         }
+        // make a visible point
+        std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
+        aShapes.push_back(aCenterPointShape);
+      }
+      if (!aShapes.empty()) {
+        std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
+        AISObjectPtr anAIS = thePrevious;
+        if (!anAIS)
+          anAIS = AISObjectPtr(new GeomAPI_AISObject);
+        anAIS->createShape(aCompound);
+        anAIS->setWidth(3);
+        return anAIS;
       }
     }
   }
@@ -161,6 +281,8 @@ void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
   if (!aData->isValid())
     return;
 
+  aData->blockSendAttributeUpdated(true);
+
   myStartUpdate = true;
   myEndUpdate = true;
   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
@@ -176,6 +298,11 @@ void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
   aPoint1->move(theDeltaX, theDeltaY);
+
+  std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
+      std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
+  aPassedPoint->move(theDeltaX, theDeltaY);
+  aData->blockSendAttributeUpdated(false);
 }
 
 bool SketchPlugin_Arc::isFixed() {
@@ -184,14 +311,35 @@ bool SketchPlugin_Arc::isFixed() {
 
 bool SketchPlugin_Arc::isFeatureValid()
 {
+  AttributeStringPtr anArcTypeAttr =
+      std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
+  if (!anArcTypeAttr)
+    return false;
+  std::string anArcType = anArcTypeAttr->value();
+
   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
+  std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
+      GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
+
+  bool isValid = false;
+  if (anArcType == ARC_TYPE_THREE_POINTS())
+    isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
+  else
+    isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 
-  return aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
+  return isValid;
+}
+
+static inline void adjustPeriod(double& theParam)
+{
+  static const double PERIOD = 2.0 * PI;
+  while (theParam < 0.0) theParam += PERIOD;
+  while (theParam >= PERIOD) theParam -= PERIOD;
 }
 
 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
@@ -217,70 +365,373 @@ void SketchPlugin_Arc::attributeChanged(const std::string& theID)
     }
     return;
   }
-  if (!aCenterAttr->isInitialized())
-    return;
-  if (!aStartAttr->isInitialized())
-    return;
-  if (!anEndAttr->isInitialized())
+  AttributeStringPtr aTypeAttr =
+      std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
+
+  // this is before others since here end attribute may be changed, but with the special behavior
+  if (aTypeAttr->value() == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
+    SketchPlugin_Sketch* aSketch = sketch();
+    AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        data()->attribute(TANGENT_POINT_ID()));
+
+    if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
+      // compute orthogonal direction
+      std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
+      std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
+          std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
+      std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
+      FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
+      std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
+          aTangFeature->lastResult()->shape());
+      if (aTangEdge->isLine()) {
+        std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
+        std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
+        std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
+        anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
+      }
+      else if (aTangEdge->isArc()) {
+        std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
+        std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
+        anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
+            new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
+      }
+
+      // compute parameters of the middle perpendicular
+      std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
+      std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
+      std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
+      std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
+          new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
+
+      // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
+      std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
+      std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
+      std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
+      if (aCenter) {
+        data()->blockSendAttributeUpdated(true);
+        aCenterAttr->setValue(aCenter);
+        aStartAttr->setValue(aTangPnt2d);
+        data()->blockSendAttributeUpdated(false);
+      }
+
+      tangencyArcConstraints();
+    }
     return;
+  }
 
-  // update the points in accordance to the changed point changes
-  if (theID == END_ID() && !myEndUpdate) {
-    myEndUpdate = true;
-    // compute and change the arc end point
-    std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
-        new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
-    std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
-    if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance) {
-      // issue #855: trying to update only not-updated coordinate if it is possible
-      if (abs(myXEndBefore - anEndAttr->x()) < 1.e-10) { // keep Y unchanged
-        double aVy = aCenterAttr->y() - anEndAttr->y();
-        double aVy2 = aVy * aVy;
-        double aR2 = aCircleForArc->radius() * aCircleForArc->radius();
-        if (aVy2 <= aR2) {
-          double aDX = sqrt(aR2 - aVy * aVy);
-          if (anEndAttr->x() > aCenterAttr->x())
-            aProjection->setX(aCenterAttr->x() + aDX);
-          else 
-            aProjection->setX(aCenterAttr->x() - aDX);
-          aProjection->setY(anEndAttr->y());
-        }
-      } else if (abs(myYEndBefore - anEndAttr->y()) < 1.e-10) { // keep X unchanged
-        double aVx = aCenterAttr->x() - anEndAttr->x();
-        double aVx2 = aVx * aVx;
-        double aR2 = aCircleForArc->radius() * aCircleForArc->radius();
-        if (aVx2 <= aR2) {
-          double aDY = sqrt(aR2 - aVx * aVx);
-          if (anEndAttr->y() > aCenterAttr->y())
-            aProjection->setY(aCenterAttr->y() + aDY);
-          else 
-            aProjection->setY(aCenterAttr->y() - aDY);
-          aProjection->setX(anEndAttr->x());
+  // if changed the base attributes, update all other (is necessary) without recursion
+  if (theID == CENTER_ID() || theID == START_ID() || theID == END_ID() || theID == ARC_TYPE()) {
+    if (!isFeatureValid())
+      return;
+    std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
+    std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
+    std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
+    double aRadius = aCenter->distance(aStart);
+    if (aRadius < tolerance)
+      return;
+    std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(aCenter, aStart));
+
+    data()->blockSendAttributeUpdated(true);
+    if (theID == END_ID() && isStable()) {
+      // The arc is under construction, so its end point projected
+      // on the circle formed by center and start points
+      std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEnd);
+      if (aProjection && anEnd->distance(aProjection) > tolerance) {
+        anEndAttr->setValue(aProjection);
+        anEnd = aProjection;
+      }
+    }
+    // update all other attributes due to the base attributes values
+    if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // update passed point due to start, end and center
+      if (aCenter->distance(aStart) > tolerance && aCenter->distance(anEnd) > tolerance) {
+        // project passed point t othe circle
+        std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
+          std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
+        if (aPassedAttr->isInitialized()) {
+          std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aPassedAttr->pnt());
+          if (aProjection && aPassedAttr->pnt()->distance(aProjection) > tolerance) {
+            aPassedAttr->setValue(aProjection);
+          }
+        } else { // initialize it by some middle - value
+          std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
+            aStart->xy()->decreased(aCenter->xy())));
+          std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
+            anEnd->xy()->decreased(aCenter->xy())));
+          std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
+          if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
+            // start and end directions are opposite, so middle direction will be orthogonal
+            aMidDirXY->setX(-aStartDir->y());
+            aMidDirXY->setY(aStartDir->x());
+          }
+          std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
+          if ((aStartDir->cross(aMidDir) > 0) ^ !isReversed())
+            aMidDir->reverse();
+          std::shared_ptr<GeomAPI_XY> aPassedPnt = 
+            aCenter->xy()->added(aMidDir->xy()->multiplied(aCenter->distance(aStart)));
+          std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()))->
+            setValue(aPassedPnt->x(), aPassedPnt->y());
         }
       }
+    }
+    // update radius and angle
+    AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
+        data()->attribute(RADIUS_ID()));
+    aRadiusAttr->setValue(aRadius);
+    AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
+        data()->attribute(ANGLE_ID()));
+    std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter, aStart));
+    double aStartParam, aEndParam;
+    aCircle->parameter(aStart, paramTolerance, aStartParam);
+    aCircle->parameter(anEnd, paramTolerance, aEndParam);
+    adjustPeriod(aStartParam);
+    adjustPeriod(aEndParam);
+    if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // use the passed point for the angle calculation
+      std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
+        std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
+      double aPassedParam;
+      aCircle->parameter(aPassedAttr->pnt(), paramTolerance, aPassedParam);
+      adjustPeriod(aPassedParam);
+      double aNewAngle = aPassedParam >= aStartParam && aPassedParam <= aEndParam ?
+        ((aEndParam - aStartParam) * 180.0 / PI) :
+        ((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
+      if (fabs(aNewAngle - anAngleAttr->value()) > tolerance)
+        anAngleAttr->setValue(aNewAngle);
+    } else {
+      double aNewAngle = (aEndParam - aStartParam) * 180.0 / PI;
+      if (fabs(aNewAngle - anAngleAttr->value()) > tolerance)
+        anAngleAttr->setValue(aNewAngle);
+    }
+    // do not need to inform that other parameters were changed in this basis mode: these arguments
+    // change is enough
+    data()->blockSendAttributeUpdated(false, false);
+    return;
+  }
 
-      anEndAttr->setValue(aProjection);
+  if (theID == PASSED_POINT_ID()) {
+    data()->blockSendAttributeUpdated(true);
+
+    std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
+    int aNbInitialized = 0;
+    for (int i = 1; i <= 3; ++i) {
+      std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
+          std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
+      if (aCurPnt->isInitialized())
+        aPoints[aNbInitialized++] = aCurPnt->pnt();
     }
-    myXEndBefore = anEndAttr->x();
-    myYEndBefore = anEndAttr->y();
-    myEndUpdate = false;
-  } else if (theID == START_ID() && !myStartUpdate) {
-    myStartUpdate = true;
-    // compute and change the arc start point
-    std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
-        new GeomAPI_Circ2d(aCenterAttr->pnt(), anEndAttr->pnt()));
-    std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aStartAttr->pnt());
-    if (aProjection && aStartAttr->pnt()->distance(aProjection) > tolerance)
-      aStartAttr->setValue(aProjection);
-    myStartUpdate = false;
-  } else if (theID == CENTER_ID() && !myEndUpdate) {
-    myEndUpdate = true;
-    // compute and change the arc end point
-    std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
-        new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
-    std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
-    if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
-      anEndAttr->setValue(aProjection);
-    myEndUpdate = false;
+
+    if (aNbInitialized == 3) {
+      std::shared_ptr<GeomAPI_Circ2d> aCircle(
+          new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
+
+      std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
+      if (aCenter) {
+        aCenterAttr->setValue(aCenter);
+      }
+    }
+    data()->blockSendAttributeUpdated(false);
+    return;
+  }
+
+  if (theID == RADIUS_ID()) {
+    if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized() || !aCenterAttr->isInitialized())
+      return;
+    // move center and passed point
+    std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
+    std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
+    std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
+    if (aStart->distance(aCenter) < tolerance || anEnd->distance(aCenter) < tolerance)
+      return;
+    AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
+        data()->attribute(RADIUS_ID()));
+    double aRadius = aRadiusAttr->value();
+
+    data()->blockSendAttributeUpdated(true);
+    std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStart->xy()->decreased(aCenter->xy())));
+    std::shared_ptr<GeomAPI_XY> aNewStart = aStartDir->xy()->multiplied(aRadius)->added(aCenter->xy());
+    aStartAttr->setValue(aNewStart->x(), aNewStart->y());
+    std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEnd->xy()->decreased(aCenter->xy())));
+    std::shared_ptr<GeomAPI_XY> aNewEnd = anEndDir->xy()->multiplied(aRadius)->added(aCenter->xy());
+    anEndAttr->setValue(aNewEnd->x(), aNewEnd->y());
+    data()->blockSendAttributeUpdated(false);
+    return;
+  }
+  if (theID == ANGLE_ID()) {
+    if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
+      return;
+    AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
+        data()->attribute(ANGLE_ID()));
+    data()->blockSendAttributeUpdated(true);
+    // move end point and passed point
+    std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
+    double anAngle = anAngleAttr->value() * PI / 180.0;
+    double sinA = sin(anAngle);
+    double cosA = cos(anAngle);
+    std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
+    std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
+        aStartDir->x() * cosA - aStartDir->y() * sinA,
+        aStartDir->x() * sinA + aStartDir->y() * cosA));
+    anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
+    data()->blockSendAttributeUpdated(false);
+    return;
+  }
+}
+
+void SketchPlugin_Arc::setReversed(bool isReversed)
+{
+  std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
+  myParamBefore = 0.0;
+}
+
+bool SketchPlugin_Arc::isReversed()
+{
+  return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
+}
+
+void SketchPlugin_Arc::tangencyArcConstraints()
+{
+  if (!lastResult())
+    return;
+
+  std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
+      std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
+  AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+      attribute(TANGENT_POINT_ID()));
+  if (!aTangPtAttr->attr())
+    return;
+
+  FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
+  ObjectPtr aThisArc = aFeature->lastResult();
+  aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
+  ObjectPtr aTangFeature = aFeature->lastResult();
+
+  // trying to find constraints to fix the tangency of the arc
+  std::set<FeaturePtr> aCoincidence;
+  std::set<FeaturePtr> aTangency;
+
+  AttributeRefAttrPtr aRefAttrA, aRefAttrB;
+  std::set<AttributePtr> aRefs = data()->refsToMe();
+  const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
+  aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
+  std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
+  for (; aRefIt != aRefs.end(); ++aRefIt) {
+    FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
+    if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
+      aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
+      aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
+      if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
+          (aRefAttrB && aRefAttrB->attr() == aStartAttr))
+        aCoincidence.insert(aConstrFeature);
+    }
+    else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
+      aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
+      aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
+      if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
+          (aRefAttrB && aRefAttrB->object() == aThisArc))
+        aTangency.insert(aConstrFeature);
+    }
+  }
+  // search applicable pair of constraints
+  bool isFound = false;
+  FeaturePtr aPrevCoincidence, aPrevTangency;
+  std::set<FeaturePtr>::const_iterator aCIt, aTIt;
+  for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
+    aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
+    aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
+    AttributePtr anOtherPoint =
+        aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
+    for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
+      aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
+      aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+          (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
+      ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
+          aRefAttrB->object() : aRefAttrA->object();
+      FeaturePtr anOtherFeature = ModelAPI_Feature::feature(anOtherObject);
+      if (anOtherPoint->owner() == anOtherFeature) {
+        isFound = true;
+        aPrevCoincidence = *aCIt;
+        aPrevTangency = *aTIt;
+      }
+    }
+  }
+
+  if (isFound) {
+    // update previous constraints
+    aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
+    aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
+    if (aRefAttrA->attr() == aStartAttr)
+      aRefAttrB->setAttr(aTangPtAttr->attr());
+    else
+      aRefAttrA->setAttr(aTangPtAttr->attr());
+
+    aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
+    aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
+    if (aRefAttrA->object() == aThisArc)
+      aRefAttrB->setObject(aTangFeature);
+    else
+      aRefAttrA->setObject(aTangFeature);
+  } else {
+    // Wait all constraints being removed, then send update events
+    static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
+    bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
+    if (isDeleteFlushed)
+      Events_Loop::loop()->setFlushed(aDeleteEvent, false);
+    // Remove all obtained constraints which use current arc, because
+    // there is no information which of them were used to build tangency arc.
+    DocumentPtr aDoc = sketch()->document();
+    std::set<FeaturePtr> aFeaturesToBeRemoved;
+    for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
+      aFeaturesToBeRemoved.insert(*aCIt);
+    for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
+      aFeaturesToBeRemoved.insert(*aTIt);
+    ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
+    // Send events to update the sub-features by the solver.
+    if (isDeleteFlushed)
+      Events_Loop::loop()->setFlushed(aDeleteEvent, true);
+    else
+      Events_Loop::loop()->flush(aDeleteEvent);
+
+    // Wait all constraints being created, then send update events
+    static Events_ID aCreateEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
+    bool isCreateFlushed = Events_Loop::loop()->isFlushed(aCreateEvent);
+    if (isCreateFlushed)
+      Events_Loop::loop()->setFlushed(aCreateEvent, false);
+
+    // Create new constraints
+    FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
+    aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
+    aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
+    aRefAttrA->setAttr(aStartAttr);
+    aRefAttrB->setAttr(aTangPtAttr->attr());
+    aConstraint->execute();
+    ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
+
+    aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
+    aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
+    aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
+        aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
+    aRefAttrA->setObject(aThisArc);
+    aRefAttrB->setObject(aTangFeature);
+    aConstraint->execute();
+    ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
+
+    // Send events to update the sub-features by the solver.
+    if(isCreateFlushed)
+      Events_Loop::loop()->setFlushed(aCreateEvent, true);
+    else
+      Events_Loop::loop()->flush(aCreateEvent);
   }
 }