src/SketchPlugin/SketchPlugin_Arc.cpp

   1 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D -->
   2
   3 // File:        SketchPlugin_Arc.cpp
   4 // Created:     26 Apr 2014
   5 // Author:      Artem ZHIDKOV
   6
   7 #include "SketchPlugin_Arc.h"
   8 #include "SketchPlugin_Sketch.h"
   9 #include <SketchPlugin_ConstraintCoincidence.h>
  10 #include <SketchPlugin_ConstraintTangent.h>
  11
  12 #include <Events_Loop.h>
  13 #include <ModelAPI_Data.h>
  14 #include <ModelAPI_ResultConstruction.h>
  15 #include <ModelAPI_AttributeDouble.h>
  16 #include <ModelAPI_AttributeRefAttr.h>
  17 #include <ModelAPI_AttributeSelection.h>
  18 #include <ModelAPI_AttributeString.h>
  19 #include <ModelAPI_Events.h>
  20 #include <ModelAPI_Validator.h>
  21 #include <ModelAPI_Session.h>
  22
  23 #include <GeomAPI_Ax2.h>
  24 #include <GeomAPI_Circ2d.h>
  25 #include <GeomAPI_Circ.h>
  26 #include <GeomAPI_Dir2d.h>
  27 #include <GeomAPI_Dir.h>
  28 #include <GeomAPI_Lin2d.h>
  29 #include <GeomAPI_Lin.h>
  30 #include <GeomAPI_Pnt2d.h>
  31 #include <GeomAPI_XY.h>
  32 #include <GeomDataAPI_Point2D.h>
  33 #include <GeomDataAPI_Dir.h>
  34 #include <GeomAlgoAPI_PointBuilder.h>
  35 #include <GeomAlgoAPI_EdgeBuilder.h>
  36 #include <GeomAlgoAPI_CompoundBuilder.h>
  37 // for sqrt on Linux
  38 #include <math.h>
  39
  40 const double tolerance = 1e-7;
  41 const double paramTolerance = 1.e-4;
  42 const double PI =3.141592653589793238463;
  43
  44 namespace {
  45   static const std::string& ARC_TYPE()
  46   {
  47     static const std::string TYPE("ArcType");
  48     return TYPE;
  49   }
  50   static const std::string& ARC_TYPE_CENTER_START_END()
  51   {
  52     static const std::string TYPE("CenterStartEnd");
  53     return TYPE;
  54   }
  55   static const std::string& ARC_TYPE_THREE_POINTS()
  56   {
  57     static const std::string TYPE("ThreePoints");
  58     return TYPE;
  59   }
  60   static const std::string& ARC_TYPE_TANGENT()
  61   {
  62     static const std::string TYPE("Tangent");
  63     return TYPE;
  64   }
  65
  66   static const std::string& PASSED_POINT_ID()
  67   {
  68     static const std::string PASSED_PNT("ArcPassedPoint");
  69     return PASSED_PNT;
  70   }
  71   static const std::string& TANGENT_POINT_ID()
  72   {
  73     static const std::string TANGENT_PNT("ArcTangentPoint");
  74     return TANGENT_PNT;
  75   }
  76   static const std::string& RADIUS_ID()
  77   {
  78     static const std::string RADIUS("ArcRadius");
  79     return RADIUS;
  80   }
  81   static const std::string& ANGLE_ID()
  82   {
  83     static const std::string ANGLE("ArcAngle");
  84     return ANGLE;
  85   }
  86
  87   static const std::string& POINT_ID(int theIndex)
  88   {
  89     switch (theIndex) {
  90     case 1: return SketchPlugin_Arc::START_ID();
  91     case 2: return SketchPlugin_Arc::END_ID();
  92     case 3: return PASSED_POINT_ID();
  93     }
  94
  95     static const std::string DUMMY;
  96     return DUMMY;
  97   }
  98 }
  99
 100
 101
 102 SketchPlugin_Arc::SketchPlugin_Arc()
 103     : SketchPlugin_SketchEntity()
 104 {
 105   myStartUpdate = false;
 106   myEndUpdate = false;
 107   // default values
 108   myXEndBefore = 0;
 109   myYEndBefore = 0;
 110
 111   myParamBefore = 0;
 112 }
 113
 114 void SketchPlugin_Arc::initDerivedClassAttributes()
 115 {
 116   data()->addAttribute(CENTER_ID(), GeomDataAPI_Point2D::typeId());
 117   data()->addAttribute(START_ID(), GeomDataAPI_Point2D::typeId());
 118   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 119     GeomDataAPI_Point2D>(data()->addAttribute(END_ID(), GeomDataAPI_Point2D::typeId()));
 120   data()->addAttribute(EXTERNAL_ID(), ModelAPI_AttributeSelection::typeId());
 121   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), EXTERNAL_ID());
 122
 123   data()->addAttribute(INVERSED_ID(), ModelAPI_AttributeBoolean::typeId());
 124   AttributeBooleanPtr isInversed =
 125       std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 126   if (!isInversed->isInitialized())
 127     isInversed->setValue(false);
 128
 129   // get the initial values
 130   if (anEndAttr->isInitialized()) {
 131     myXEndBefore = anEndAttr->x();
 132     myYEndBefore = anEndAttr->y();
 133   }
 134
 135   data()->addAttribute(ARC_TYPE(), ModelAPI_AttributeString::typeId());
 136   std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 137       data()->attribute(ARC_TYPE()))->setValue(ARC_TYPE_CENTER_START_END());
 138
 139   data()->addAttribute(PASSED_POINT_ID(), GeomDataAPI_Point2D::typeId());
 140   data()->addAttribute(TANGENT_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
 141   data()->addAttribute(RADIUS_ID(), ModelAPI_AttributeDouble::typeId());
 142   data()->addAttribute(ANGLE_ID(), ModelAPI_AttributeDouble::typeId());
 143 }
 144
 145 void SketchPlugin_Arc::execute()
 146 {
 147   SketchPlugin_Sketch* aSketch = sketch();
 148   // result for the arc is set only when all obligatory attributes are initialized,
 149   // otherwise AIS object is used to visualize the arc's preview
 150   if (aSketch && isFeatureValid()) {
 151     ResultPtr aLastResult = lastResult();
 152     bool hasResult = aLastResult && aLastResult.get();
 153
 154     // compute a circle point in 3D view
 155     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 156         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 157     // compute the arc start point
 158     std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 159         GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 160
 161     std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 162     // make a visible point
 163     std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 164     std::shared_ptr<ModelAPI_ResultConstruction> aConstr1 = document()->createConstruction(
 165         data(), 0);
 166     aConstr1->setShape(aCenterPointShape);
 167     aConstr1->setIsInHistory(false);
 168     setResult(aConstr1, 0);
 169
 170     // make a visible circle
 171     std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 172         aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 173     std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 174     std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 175
 176     // compute and change the arc end point
 177     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 178         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 179     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 180         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 181     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 182     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 183       anEndAttr->setValue(aProjection);
 184     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
 185     AttributeBooleanPtr isInversed =
 186         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 187
 188     std::shared_ptr<GeomAPI_Dir> anXDir(new GeomAPI_Dir(aStartPoint->xyz()->decreased(aCenter->xyz())));
 189     std::shared_ptr<GeomAPI_Ax2> anAx2(new GeomAPI_Ax2(aCenter, aNormal, anXDir));
 190     std::shared_ptr<GeomAPI_Circ> aCirc(new GeomAPI_Circ(anAx2, aCenter->distance(aStartPoint)));
 191     double aParameterNew = 0.0;
 192     if(aCirc->parameter(aEndPoint, paramTolerance, aParameterNew)) {
 193       if(0 <= myParamBefore && myParamBefore <= PI / 2.0
 194         && PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0) {
 195           isInversed->setValue(true);
 196       } else if(PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0
 197         && 0 <= aParameterNew && aParameterNew <= PI / 2.0) {
 198           isInversed->setValue(false);
 199       }
 200     }
 201     myParamBefore = aParameterNew;
 202
 203     std::shared_ptr<GeomAPI_Shape> aCircleShape;
 204     if(!isInversed->value()) {
 205       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 206     } else {
 207       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
 208     }
 209
 210     if (aCircleShape) {
 211       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
 212           data(), 1);
 213       aConstr2->setShape(aCircleShape);
 214       aConstr2->setIsInHistory(false);
 215       setResult(aConstr2, 1);
 216     }
 217
 218     AttributeRefAttrPtr aTangentPoint = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 219         attribute(TANGENT_POINT_ID()));
 220     if (!hasResult && aTangentPoint->attr())
 221       tangencyArcConstraints();
 222   }
 223 }
 224
 225 AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
 226 {
 227   SketchPlugin_Sketch* aSketch = sketch();
 228   if (aSketch) {
 229     // if the feature is valid, the execute() method should be performed, AIS object is empty
 230     if (!isFeatureValid()) {
 231       // compute a circle point in 3D view
 232       std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 233           GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 234       if (aCenterAttr->isInitialized()) {
 235         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 236
 237         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 238             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 239         std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
 240             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 241         AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 242             data()->attribute(ARC_TYPE()));
 243
 244         if (aStartAttr->isInitialized()) {
 245           // make a visible circle
 246           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 247               aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 248           bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
 249           if (aHasPlane) {
 250             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 251             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 252             std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
 253             if (aTypeAttr && aTypeAttr->isInitialized() &&
 254                 aTypeAttr->value() == ARC_TYPE_THREE_POINTS() && aEndAttr->isInitialized())
 255               aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
 256             std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
 257                                                             aCenter, aStartPoint, aEndPoint, aNormal);
 258             if (aCircleShape) {
 259               std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
 260               // make a visible point
 261               std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 262               aShapes.push_back(aCenterPointShape);
 263
 264               aShapes.push_back(aCircleShape);
 265               if (!aShapes.empty())
 266               {
 267                 std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
 268                 AISObjectPtr anAIS = thePrevious;
 269                 if (!anAIS)
 270                   anAIS = AISObjectPtr(new GeomAPI_AISObject);
 271                 anAIS->createShape(aCompound);
 272                 anAIS->setWidth(3);
 273                 return anAIS;
 274               }
 275             }
 276           }
 277         }
 278       }
 279     }
 280   }
 281   return AISObjectPtr();
 282 }
 283
 284 void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
 285 {
 286   std::shared_ptr<ModelAPI_Data> aData = data();
 287   if (!aData->isValid())
 288     return;
 289
 290   aData->blockSendAttributeUpdated(true);
 291
 292   myStartUpdate = true;
 293   myEndUpdate = true;
 294   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 295       aData->attribute(SketchPlugin_Arc::START_ID()));
 296   aPoint2->move(theDeltaX, theDeltaY);
 297
 298   std::shared_ptr<GeomDataAPI_Point2D> aPoint3 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 299       aData->attribute(SketchPlugin_Arc::END_ID()));
 300   aPoint3->move(theDeltaX, theDeltaY);
 301   myStartUpdate = false;
 302   myEndUpdate = false;
 303
 304   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 305       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
 306   aPoint1->move(theDeltaX, theDeltaY);
 307
 308   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 309       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
 310   aPassedPoint->move(theDeltaX, theDeltaY);
 311   aData->blockSendAttributeUpdated(false);
 312 }
 313
 314 bool SketchPlugin_Arc::isFixed() {
 315   return data()->selection(EXTERNAL_ID())->context().get() != NULL;
 316 }
 317
 318 bool SketchPlugin_Arc::isFeatureValid()
 319 {
 320   AttributeStringPtr anArcTypeAttr =
 321       std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
 322   if (!anArcTypeAttr)
 323     return false;
 324   std::string anArcType = anArcTypeAttr->value();
 325
 326   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 327       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
 328   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 329       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 330   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 331       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 332   std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
 333       GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 334
 335   bool isValid = false;
 336   if (anArcType == ARC_TYPE_THREE_POINTS())
 337     isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
 338   else
 339     isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 340
 341   return isValid;
 342 }
 343
 344 static inline void adjustPeriod(double& theParam)
 345 {
 346   static const double PERIOD = 2.0 * PI;
 347   while (theParam < 0.0) theParam += PERIOD;
 348   while (theParam >= PERIOD) theParam -= PERIOD;
 349 }
 350
 351 static inline void calculateArcAngleRadius(
 352     const std::shared_ptr<GeomAPI_Circ2d>& theCircle,
 353     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 354     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 355     const std::shared_ptr<GeomAPI_Pnt2d>& thePassedPoint,
 356     AttributeDoublePtr theAngleAttr,
 357     AttributeDoublePtr theRadiusAttr)
 358 {
 359   double aStartParam, aEndParam, aPassedParam;
 360   theCircle->parameter(theStartPoint, paramTolerance, aStartParam);
 361   theCircle->parameter(theEndPoint, paramTolerance, aEndParam);
 362   theCircle->parameter(thePassedPoint, paramTolerance, aPassedParam);
 363   adjustPeriod(aStartParam);
 364   adjustPeriod(aEndParam);
 365   adjustPeriod(aPassedParam);
 366
 367   if (aPassedParam >= aStartParam && aPassedParam <= aEndParam)
 368     theAngleAttr->setValue((aEndParam - aStartParam) * 180.0 / PI);
 369   else
 370     theAngleAttr->setValue((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 371   theRadiusAttr->setValue(theCircle->radius());
 372 }
 373
 374 static inline void calculatePassedPoint(
 375     const std::shared_ptr<GeomAPI_Pnt2d>& theCenter,
 376     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 377     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 378     bool theArcReversed,
 379     std::shared_ptr<GeomDataAPI_Point2D> thePassedPoint)
 380 {
 381   std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 382       theStartPoint->xy()->decreased(theCenter->xy())));
 383   std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 384       theEndPoint->xy()->decreased(theCenter->xy())));
 385   std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 386   if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 387     // start and end directions are opposite, so middle direction will be orthogonal
 388     aMidDirXY->setX(-aStartDir->y());
 389     aMidDirXY->setY(aStartDir->x());
 390   }
 391   std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 392   if ((aStartDir->cross(aMidDir) > 0) ^ !theArcReversed)
 393     aMidDir->reverse();
 394
 395   double aRadius = theCenter->distance(theStartPoint);
 396   std::shared_ptr<GeomAPI_XY> aPassedPnt = theCenter->xy()->added( aMidDir->xy()->multiplied(aRadius) );
 397   thePassedPoint->setValue(aPassedPnt->x(), aPassedPnt->y());
 398 }
 399
 400 void SketchPlugin_Arc::updateDependentAttributes()
 401 {
 402   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 403       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 404   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 405       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 406   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 407       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 408   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 409       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 410   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 411       data()->attribute(RADIUS_ID()));
 412   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 413       data()->attribute(ANGLE_ID()));
 414
 415   if (!aPassedPoint)
 416     return;
 417
 418   data()->blockSendAttributeUpdated(true);
 419
 420   calculatePassedPoint(aCenterAttr->pnt(), aStartAttr->pnt(), anEndAttr->pnt(),
 421                        isReversed(), aPassedPoint);
 422   if (aRadiusAttr && anAngleAttr) {
 423     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 424         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 425     calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 426                             anAngleAttr, aRadiusAttr);
 427   }
 428   data()->blockSendAttributeUpdated(false);
 429 }
 430
 431
 432 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
 433 {
 434   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 435       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 436   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 437       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 438   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 439       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 440   // the second condition for unability to move external segments anywhere
 441   if (theID == EXTERNAL_ID() || isFixed()) {
 442     std::shared_ptr<GeomAPI_Shape> aSelection = data()->selection(EXTERNAL_ID())->value();
 443     // update arguments due to the selection value
 444     if (aSelection && !aSelection->isNull() && aSelection->isEdge()) {
 445       std::shared_ptr<GeomAPI_Edge> anEdge( new GeomAPI_Edge(aSelection));
 446       std::shared_ptr<GeomAPI_Circ> aCirc = anEdge->circle();
 447       if (aCirc.get()) {
 448         aStartAttr->setValue(sketch()->to2D(anEdge->firstPoint()));
 449         anEndAttr->setValue(sketch()->to2D(anEdge->lastPoint()));
 450         aCenterAttr->setValue(sketch()->to2D(aCirc->center()));
 451       }
 452     }
 453     return;
 454   }
 455
 456   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 457       data()->attribute(RADIUS_ID()));
 458   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 459       data()->attribute(ANGLE_ID()));
 460
 461   if (theID == RADIUS_ID()) {
 462     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized())
 463       return;
 464     // move center and passed point
 465     std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = aStartAttr->pnt();
 466     std::shared_ptr<GeomAPI_Pnt2d> aEndPnt = anEndAttr->pnt();
 467     double aDist = aStartPnt->distance(aEndPnt);
 468     if (fabs(aDist) < tolerance)
 469       return;
 470     std::shared_ptr<GeomAPI_XY> aDir = aEndPnt->xy()->decreased(aStartPnt->xy());
 471     std::shared_ptr<GeomAPI_Dir2d> aMidPerpDir(new GeomAPI_Dir2d(-aDir->y(), aDir->x()));
 472     std::shared_ptr<GeomAPI_XY> aMidPnt = aStartPnt->xy()->added(aEndPnt->xy())->multiplied(0.5);
 473
 474     double anAngle = anAngleAttr->value() * PI / 180.0;
 475     adjustPeriod(anAngle);
 476     if (anAngle > PI)
 477       aMidPerpDir->reverse();
 478
 479     double aRadius = aRadiusAttr->value();
 480     aDist = sqrt(aRadius * aRadius - aDist * aDist / 4.0);
 481
 482     std::shared_ptr<GeomAPI_XY> aCenter = aMidPnt->added(aMidPerpDir->xy()->multiplied(aDist));
 483
 484     data()->blockSendAttributeUpdated(true);
 485     aCenterAttr->setValue(aCenter->x(), aCenter->y());
 486     updateDependentAttributes();
 487     data()->blockSendAttributeUpdated(false);
 488     return;
 489   }
 490   if (theID == ANGLE_ID()) {
 491     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 492       return;
 493     data()->blockSendAttributeUpdated(true);
 494     // move end point and passed point
 495     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 496     double anAngle = anAngleAttr->value() * PI / 180.0;
 497     double sinA = sin(anAngle);
 498     double cosA = cos(anAngle);
 499     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 500     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 501         aStartDir->x() * cosA - aStartDir->y() * sinA,
 502         aStartDir->x() * sinA + aStartDir->y() * cosA));
 503     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 504
 505     anAngle /= 2.0;
 506     sinA = sin(anAngle);
 507     cosA = cos(anAngle);
 508     aDir = std::shared_ptr<GeomAPI_XY>(new GeomAPI_XY(
 509         aStartDir->x() * cosA - aStartDir->y() * sinA,
 510         aStartDir->x() * sinA + aStartDir->y() * cosA));
 511     std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 512         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 513     aPassedPoint->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 514
 515     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 516         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 517     calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 518                             anAngleAttr, aRadiusAttr);
 519     data()->blockSendAttributeUpdated(false);
 520     return;
 521   }
 522
 523   if (theID == CENTER_ID()) {
 524     if (!isFeatureValid())
 525       return;
 526     if (aCenterAttr->pnt()->distance(aStartAttr->pnt()) < tolerance)
 527       return;
 528     data()->blockSendAttributeUpdated(true);
 529     // compute and change the arc end point
 530     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 531         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 532     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 533     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 534       anEndAttr->setValue(aProjection);
 535     updateDependentAttributes();
 536     data()->blockSendAttributeUpdated(false);
 537     return;
 538   }
 539
 540   AttributeStringPtr aTypeAttr =
 541       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 542   if (!aTypeAttr)
 543     return;
 544   std::string anArcType = aTypeAttr->value();
 545
 546   // update the points in accordance to the changed point changes
 547   if (anArcType == ARC_TYPE_CENTER_START_END()) {
 548     if (!isFeatureValid())
 549       return;
 550     updateDependentAttributes();
 551   }
 552   else if (anArcType == ARC_TYPE_THREE_POINTS() &&
 553           (theID == START_ID() || theID == END_ID() || theID == PASSED_POINT_ID())) {
 554     data()->blockSendAttributeUpdated(true);
 555
 556     std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
 557     int aNbInitialized = 0;
 558     for (int i = 1; i <= 3; ++i) {
 559       std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
 560           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
 561       if (aCurPnt->isInitialized())
 562         aPoints[aNbInitialized++] = aCurPnt->pnt();
 563     }
 564
 565     if (aNbInitialized == 1)
 566       aCenterAttr->setValue(aPoints[0]->x(), aPoints[0]->y());
 567     else if (aNbInitialized == 2) {
 568       // calculate center point, which gives a quarter of circle for the given start and end points
 569       std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = aPoints[0];
 570       std::shared_ptr<GeomAPI_Pnt2d> aEndPnt = aPoints[1];
 571       std::shared_ptr<GeomAPI_XY> aDir = aEndPnt->xy()->decreased(aStartPnt->xy())->multiplied(0.5);
 572       double x = aDir->x();
 573       double y = aDir->y();
 574       aDir->setX(x - y);
 575       aDir->setY(y + x);
 576       std::shared_ptr<GeomAPI_XY> aCenter = aStartPnt->xy()->added(aDir);
 577       double aRadius = sqrt(aDir->dot(aDir));
 578
 579       aCenterAttr->setValue(aCenter->x(), aCenter->y());
 580       aRadiusAttr->setValue(aRadius);
 581       anAngleAttr->setValue(90.0);
 582     }
 583     else {
 584       std::shared_ptr<GeomAPI_Circ2d> aCircle(
 585           new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
 586
 587       std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
 588       if (aCenter) {
 589         aCenterAttr->setValue(aCenter);
 590         if (theID == START_ID() || theID == END_ID())
 591           updateDependentAttributes();
 592         else
 593           calculateArcAngleRadius(aCircle, aPoints[0], aPoints[1], aPoints[2],
 594                                   anAngleAttr, aRadiusAttr);
 595       }
 596     }
 597
 598     data()->blockSendAttributeUpdated(false);
 599   }
 600   else if (anArcType == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
 601     SketchPlugin_Sketch* aSketch = sketch();
 602     AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 603         data()->attribute(TANGENT_POINT_ID()));
 604
 605     if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
 606       data()->blockSendAttributeUpdated(true);
 607       // compute orthogonal direction
 608       std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
 609       std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
 610           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
 611       std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
 612       FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
 613       std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
 614           aTangFeature->lastResult()->shape());
 615       if (aTangEdge->isLine()) {
 616         std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
 617         std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
 618         std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
 619         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
 620       }
 621       else if (aTangEdge->isArc()) {
 622         std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
 623         std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
 624         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
 625             new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
 626       }
 627
 628       // compute parameters of the middle perpendicular
 629       std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
 630       std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
 631       std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
 632       std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
 633           new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
 634
 635       // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
 636       std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
 637       std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
 638       std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
 639       if (aCenter) {
 640         aCenterAttr->setValue(aCenter);
 641         aStartAttr->setValue(aTangPnt2d);
 642         updateDependentAttributes();
 643       }
 644
 645       data()->blockSendAttributeUpdated(false);
 646
 647       if (theID == TANGENT_POINT_ID())
 648         tangencyArcConstraints();
 649     }
 650   }
 651 }
 652
 653 void SketchPlugin_Arc::setReversed(bool isReversed)
 654 {
 655   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 656   myParamBefore = 0.0;
 657 }
 658
 659 bool SketchPlugin_Arc::isReversed()
 660 {
 661   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 662 }
 663
 664 void SketchPlugin_Arc::tangencyArcConstraints()
 665 {
 666   if (!lastResult())
 667     return;
 668
 669   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 670       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 671   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 672       attribute(TANGENT_POINT_ID()));
 673   if (!aTangPtAttr->attr())
 674     return;
 675
 676   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 677   ObjectPtr aThisArc = aFeature->lastResult();
 678   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 679   ObjectPtr aTangFeature = aFeature->lastResult();
 680
 681   // trying to find constraints to fix the tangency of the arc
 682   std::set<FeaturePtr> aCoincidence;
 683   std::set<FeaturePtr> aTangency;
 684
 685   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 686   std::set<AttributePtr> aRefs = data()->refsToMe();
 687   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 688   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 689   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 690   for (; aRefIt != aRefs.end(); ++aRefIt) {
 691     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 692     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 693       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 694           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 695       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 696           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 697       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 698           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 699         aCoincidence.insert(aConstrFeature);
 700     }
 701     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 702       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 703           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 704       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 705           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 706       if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
 707           (aRefAttrB && aRefAttrB->object() == aThisArc))
 708         aTangency.insert(aConstrFeature);
 709     }
 710   }
 711   // search applicable pair of constraints
 712   bool isFound = false;
 713   FeaturePtr aPrevCoincidence, aPrevTangency;
 714   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 715   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 716     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 717         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 718     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 719         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 720     AttributePtr anOtherPoint =
 721         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 722     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 723       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 724           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 725       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 726           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 727       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 728           aRefAttrB->object() : aRefAttrA->object();
 729       if (anOtherPoint->owner() == anOtherObject) {
 730         isFound = true;
 731         aPrevCoincidence = *aCIt;
 732         aPrevTangency = *aTIt;
 733       }
 734     }
 735   }
 736
 737   if (isFound) {
 738     // update previous constraints
 739     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 740         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 741     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 742         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 743     if (aRefAttrA->attr() == aStartAttr)
 744       aRefAttrB->setAttr(aTangPtAttr->attr());
 745     else
 746       aRefAttrA->setAttr(aTangPtAttr->attr());
 747
 748     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 749         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 750     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 751         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 752     if (aRefAttrA->object() == aThisArc)
 753       aRefAttrB->setObject(aTangFeature);
 754     else
 755       aRefAttrA->setObject(aTangFeature);
 756   } else {
 757     // Wait all constraints being removed, then send update events
 758     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 759     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 760     if (isDeleteFlushed)
 761       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 762     // Remove all obtained constraints which use current arc, because
 763     // there is no information which of them were used to build tangency arc.
 764     DocumentPtr aDoc = sketch()->document();
 765     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 766       aDoc->removeFeature(*aCIt);
 767     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 768       aDoc->removeFeature(*aTIt);
 769     // Send events to update the sub-features by the solver.
 770     if (isDeleteFlushed)
 771       Events_Loop::loop()->setFlushed(aDeleteEvent, true);
 772     else
 773       Events_Loop::loop()->flush(aDeleteEvent);
 774
 775     // Wait all constraints being created, then send update events
 776     static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 777     bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 778     if (isUpdateFlushed)
 779       Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 780
 781     // Create new constraints
 782     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 783     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 784         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 785     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 786         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 787     aRefAttrA->setAttr(aStartAttr);
 788     aRefAttrB->setAttr(aTangPtAttr->attr());
 789     aConstraint->execute();
 790     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 791
 792     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 793     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 794         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 795     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 796         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 797     aRefAttrA->setObject(aThisArc);
 798     aRefAttrB->setObject(aTangFeature);
 799     aConstraint->execute();
 800     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 801
 802     // Send events to update the sub-features by the solver.
 803     if(isUpdateFlushed)
 804       Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 805   }
 806 }