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