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 #include <ModelAPI_Tools.h>
  23
  24 #include <GeomAPI_Ax2.h>
  25 #include <GeomAPI_Circ2d.h>
  26 #include <GeomAPI_Circ.h>
  27 #include <GeomAPI_Dir2d.h>
  28 #include <GeomAPI_Dir.h>
  29 #include <GeomAPI_Lin2d.h>
  30 #include <GeomAPI_Lin.h>
  31 #include <GeomAPI_Pnt2d.h>
  32 #include <GeomAPI_XY.h>
  33 #include <GeomDataAPI_Point2D.h>
  34 #include <GeomDataAPI_Dir.h>
  35 #include <GeomAlgoAPI_PointBuilder.h>
  36 #include <GeomAlgoAPI_EdgeBuilder.h>
  37 #include <GeomAlgoAPI_CompoundBuilder.h>
  38 // for sqrt on Linux
  39 #include <math.h>
  40
  41 const double tolerance = 1e-7;
  42 const double paramTolerance = 1.e-4;
  43 const double PI =3.141592653589793238463;
  44
  45 namespace {
  46   static const std::string& ARC_TYPE_CENTER_START_END()
  47   {
  48     static const std::string TYPE("CenterStartEnd");
  49     return TYPE;
  50   }
  51   static const std::string& ARC_TYPE_THREE_POINTS()
  52   {
  53     static const std::string TYPE("ThreePoints");
  54     return TYPE;
  55   }
  56
  57   static const std::string& PASSED_POINT_ID()
  58   {
  59     static const std::string PASSED_PNT("ArcPassedPoint");
  60     return PASSED_PNT;
  61   }
  62   static const std::string& RADIUS_ID()
  63   {
  64     static const std::string RADIUS("ArcRadius");
  65     return RADIUS;
  66   }
  67   static const std::string& ANGLE_ID()
  68   {
  69     static const std::string ANGLE("ArcAngle");
  70     return ANGLE;
  71   }
  72
  73   static const std::string& POINT_ID(int theIndex)
  74   {
  75     switch (theIndex) {
  76     case 1: return SketchPlugin_Arc::START_ID();
  77     case 2: return SketchPlugin_Arc::END_ID();
  78     case 3: return PASSED_POINT_ID();
  79     }
  80
  81     static const std::string DUMMY;
  82     return DUMMY;
  83   }
  84 }
  85
  86
  87
  88 SketchPlugin_Arc::SketchPlugin_Arc()
  89     : SketchPlugin_SketchEntity()
  90 {
  91   myStartUpdate = false;
  92   myEndUpdate = false;
  93   // default values
  94   myXEndBefore = 0;
  95   myYEndBefore = 0;
  96
  97   myParamBefore = 0;
  98 }
  99
 100 void SketchPlugin_Arc::initDerivedClassAttributes()
 101 {
 102   data()->addAttribute(CENTER_ID(), GeomDataAPI_Point2D::typeId());
 103   data()->addAttribute(START_ID(), GeomDataAPI_Point2D::typeId());
 104   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 105     GeomDataAPI_Point2D>(data()->addAttribute(END_ID(), GeomDataAPI_Point2D::typeId()));
 106   data()->addAttribute(EXTERNAL_ID(), ModelAPI_AttributeSelection::typeId());
 107   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), EXTERNAL_ID());
 108
 109   AttributeBooleanPtr isInversed = std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(
 110     data()->addAttribute(INVERSED_ID(), ModelAPI_AttributeBoolean::typeId()));
 111
 112   // get the initial values
 113   if (anEndAttr->isInitialized()) {
 114     myXEndBefore = anEndAttr->x();
 115     myYEndBefore = anEndAttr->y();
 116   }
 117
 118   AttributeStringPtr anArcType = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 119     data()->addAttribute(ARC_TYPE(), ModelAPI_AttributeString::typeId()));
 120
 121   data()->addAttribute(PASSED_POINT_ID(), GeomDataAPI_Point2D::typeId());
 122   data()->addAttribute(TANGENT_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
 123   data()->addAttribute(RADIUS_ID(), ModelAPI_AttributeDouble::typeId());
 124   data()->addAttribute(ANGLE_ID(), ModelAPI_AttributeDouble::typeId());
 125
 126   // set after all to avoid in attributeChanged reference to not existing attributes
 127   if (!isInversed->isInitialized())
 128     isInversed->setValue(false);
 129   anArcType->setValue(ARC_TYPE_CENTER_START_END());
 130 }
 131
 132 void SketchPlugin_Arc::execute()
 133 {
 134   SketchPlugin_Sketch* aSketch = sketch();
 135   // result for the arc is set only when all obligatory attributes are initialized,
 136   // otherwise AIS object is used to visualize the arc's preview
 137   if (aSketch && isFeatureValid()) {
 138     ResultPtr aLastResult = lastResult();
 139     bool hasResult = aLastResult && aLastResult.get();
 140
 141     // compute a circle point in 3D view
 142     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 143         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 144     // compute the arc start point
 145     std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 146         GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 147
 148     std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 149     // make a visible point
 150     std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 151     std::shared_ptr<ModelAPI_ResultConstruction> aConstr1 = document()->createConstruction(
 152         data(), 0);
 153     aConstr1->setShape(aCenterPointShape);
 154     aConstr1->setIsInHistory(false);
 155     setResult(aConstr1, 0);
 156
 157     // make a visible circle
 158     std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 159         aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 160     std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 161     std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 162
 163     // compute and change the arc end point
 164     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 165         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 166     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 167         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 168     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 169     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 170       anEndAttr->setValue(aProjection);
 171     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
 172     AttributeBooleanPtr isInversed =
 173         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 174
 175     std::shared_ptr<GeomAPI_Dir> anXDir(new GeomAPI_Dir(aStartPoint->xyz()->decreased(aCenter->xyz())));
 176     std::shared_ptr<GeomAPI_Ax2> anAx2(new GeomAPI_Ax2(aCenter, aNormal, anXDir));
 177     std::shared_ptr<GeomAPI_Circ> aCirc(new GeomAPI_Circ(anAx2, aCenter->distance(aStartPoint)));
 178     double aParameterNew = 0.0;
 179     if(aCirc->parameter(aEndPoint, paramTolerance, aParameterNew)) {
 180       if(0 <= myParamBefore && myParamBefore <= PI / 2.0
 181         && PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0) {
 182           isInversed->setValue(true);
 183       } else if(PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0
 184         && 0 <= aParameterNew && aParameterNew <= PI / 2.0) {
 185           isInversed->setValue(false);
 186       }
 187     }
 188     myParamBefore = aParameterNew;
 189
 190     std::shared_ptr<GeomAPI_Shape> aCircleShape;
 191     if(!isInversed->value()) {
 192       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 193     } else {
 194       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
 195     }
 196
 197     if (aCircleShape) {
 198       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
 199           data(), 1);
 200       aConstr2->setShape(aCircleShape);
 201       aConstr2->setIsInHistory(false);
 202       setResult(aConstr2, 1);
 203     }
 204
 205     // update radius and angle
 206     updateDependentAttributes();
 207   }
 208 }
 209
 210 AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
 211 {
 212   SketchPlugin_Sketch* aSketch = sketch();
 213   if (aSketch) {
 214     // if the feature is valid, the execute() method should be performed, AIS object is empty
 215     if (!isFeatureValid()) {
 216       // compute a circle point in 3D view
 217       std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 218           GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 219
 220       std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
 221       if (aCenterAttr->isInitialized()) {
 222         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 223         // make a visible point
 224         std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 225         aShapes.push_back(aCenterPointShape);
 226
 227         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 228             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 229         std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
 230             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 231         AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 232             data()->attribute(ARC_TYPE()));
 233
 234         if (aStartAttr->isInitialized()) {
 235           // make a visible circle
 236           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 237               aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 238           bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
 239           if (aHasPlane) {
 240             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 241             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 242             std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
 243             if (aTypeAttr && aTypeAttr->isInitialized() &&
 244                 aTypeAttr->value() == ARC_TYPE_THREE_POINTS() && aEndAttr->isInitialized())
 245               aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
 246
 247             std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
 248                                                             aCenter, aStartPoint, aEndPoint, aNormal);
 249             if (aCircleShape)
 250               aShapes.push_back(aCircleShape);
 251           }
 252         }
 253       }
 254       if (!aShapes.empty()) {
 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   return AISObjectPtr();
 266 }
 267
 268 void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
 269 {
 270   std::shared_ptr<ModelAPI_Data> aData = data();
 271   if (!aData->isValid())
 272     return;
 273
 274   aData->blockSendAttributeUpdated(true);
 275
 276   myStartUpdate = true;
 277   myEndUpdate = true;
 278   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 279       aData->attribute(SketchPlugin_Arc::START_ID()));
 280   aPoint2->move(theDeltaX, theDeltaY);
 281
 282   std::shared_ptr<GeomDataAPI_Point2D> aPoint3 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 283       aData->attribute(SketchPlugin_Arc::END_ID()));
 284   aPoint3->move(theDeltaX, theDeltaY);
 285   myStartUpdate = false;
 286   myEndUpdate = false;
 287
 288   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 289       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
 290   aPoint1->move(theDeltaX, theDeltaY);
 291
 292   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 293       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
 294   aPassedPoint->move(theDeltaX, theDeltaY);
 295   aData->blockSendAttributeUpdated(false);
 296 }
 297
 298 bool SketchPlugin_Arc::isFixed() {
 299   return data()->selection(EXTERNAL_ID())->context().get() != NULL;
 300 }
 301
 302 bool SketchPlugin_Arc::isFeatureValid()
 303 {
 304   AttributeStringPtr anArcTypeAttr =
 305       std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
 306   if (!anArcTypeAttr)
 307     return false;
 308   std::string anArcType = anArcTypeAttr->value();
 309
 310   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 311       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
 312   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 313       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 314   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 315       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 316   std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
 317       GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 318
 319   bool isValid = false;
 320   if (anArcType == ARC_TYPE_THREE_POINTS())
 321     isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
 322   else
 323     isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 324
 325   return isValid;
 326 }
 327
 328 static inline void adjustPeriod(double& theParam)
 329 {
 330   static const double PERIOD = 2.0 * PI;
 331   while (theParam < 0.0) theParam += PERIOD;
 332   while (theParam >= PERIOD) theParam -= PERIOD;
 333 }
 334
 335 static inline void calculateArcAngleRadius(
 336     const std::shared_ptr<GeomAPI_Circ2d>& theCircle,
 337     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 338     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 339     const std::shared_ptr<GeomAPI_Pnt2d>& thePassedPoint,
 340     AttributeDoublePtr theAngleAttr,
 341     AttributeDoublePtr theRadiusAttr)
 342 {
 343   double aStartParam, aEndParam, aPassedParam;
 344   theCircle->parameter(theStartPoint, paramTolerance, aStartParam);
 345   theCircle->parameter(theEndPoint, paramTolerance, aEndParam);
 346   theCircle->parameter(thePassedPoint, paramTolerance, aPassedParam);
 347   adjustPeriod(aStartParam);
 348   adjustPeriod(aEndParam);
 349   adjustPeriod(aPassedParam);
 350
 351   if (aPassedParam >= aStartParam && aPassedParam <= aEndParam)
 352     theAngleAttr->setValue((aEndParam - aStartParam) * 180.0 / PI);
 353   else
 354     theAngleAttr->setValue((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 355   theRadiusAttr->setValue(theCircle->radius());
 356 }
 357
 358 static inline bool calculatePassedPoint(
 359     const std::shared_ptr<GeomAPI_Pnt2d>& theCenter,
 360     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 361     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 362     bool theArcReversed,
 363     std::shared_ptr<GeomDataAPI_Point2D> thePassedPoint)
 364 {
 365   if (theCenter->distance(theStartPoint) < tolerance ||
 366       theCenter->distance(theEndPoint) < tolerance)
 367     return false;
 368
 369   std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 370       theStartPoint->xy()->decreased(theCenter->xy())));
 371   std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 372       theEndPoint->xy()->decreased(theCenter->xy())));
 373   std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 374   if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 375     // start and end directions are opposite, so middle direction will be orthogonal
 376     aMidDirXY->setX(-aStartDir->y());
 377     aMidDirXY->setY(aStartDir->x());
 378   }
 379   std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 380   if ((aStartDir->cross(aMidDir) > 0) ^ !theArcReversed)
 381     aMidDir->reverse();
 382
 383   double aRadius = theCenter->distance(theStartPoint);
 384   std::shared_ptr<GeomAPI_XY> aPassedPnt = theCenter->xy()->added( aMidDir->xy()->multiplied(aRadius) );
 385   thePassedPoint->setValue(aPassedPnt->x(), aPassedPnt->y());
 386   return true;
 387 }
 388
 389 void SketchPlugin_Arc::updateDependentAttributes()
 390 {
 391   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 392       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 393   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 394       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 395   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 396       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 397   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 398       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 399   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 400       data()->attribute(RADIUS_ID()));
 401   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 402       data()->attribute(ANGLE_ID()));
 403
 404   if (!aPassedPoint)
 405     return;
 406
 407   data()->blockSendAttributeUpdated(true);
 408
 409   bool isOk = calculatePassedPoint(aCenterAttr->pnt(), aStartAttr->pnt(), anEndAttr->pnt(),
 410                        isReversed(), aPassedPoint);
 411   if (isOk && aRadiusAttr && anAngleAttr) {
 412     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 413         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 414     if (aCircle->implPtr<void*>())
 415       calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 416                               anAngleAttr, aRadiusAttr);
 417   }
 418   data()->blockSendAttributeUpdated(false);
 419 }
 420
 421
 422 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
 423 {
 424   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 425       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 426   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 427       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 428   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 429       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 430   // the second condition for unability to move external segments anywhere
 431   if (theID == EXTERNAL_ID() || isFixed()) {
 432     std::shared_ptr<GeomAPI_Shape> aSelection = data()->selection(EXTERNAL_ID())->value();
 433     // update arguments due to the selection value
 434     if (aSelection && !aSelection->isNull() && aSelection->isEdge()) {
 435       std::shared_ptr<GeomAPI_Edge> anEdge( new GeomAPI_Edge(aSelection));
 436       std::shared_ptr<GeomAPI_Circ> aCirc = anEdge->circle();
 437       if (aCirc.get()) {
 438         aStartAttr->setValue(sketch()->to2D(anEdge->firstPoint()));
 439         anEndAttr->setValue(sketch()->to2D(anEdge->lastPoint()));
 440         aCenterAttr->setValue(sketch()->to2D(aCirc->center()));
 441       }
 442     }
 443     return;
 444   }
 445
 446   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 447       data()->attribute(RADIUS_ID()));
 448   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 449       data()->attribute(ANGLE_ID()));
 450
 451   if (theID == RADIUS_ID()) {
 452     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized())
 453       return;
 454     // move center and passed point
 455     std::shared_ptr<GeomAPI_XY> aStartPnt = aStartAttr->pnt()->xy();
 456     std::shared_ptr<GeomAPI_XY> aEndPnt = anEndAttr->pnt()->xy();
 457     double aDist = aStartPnt->distance(aEndPnt);
 458     if (fabs(aDist) < tolerance)
 459       return;
 460     std::shared_ptr<GeomAPI_Dir2d> aDir(new GeomAPI_Dir2d(aEndPnt->decreased(aStartPnt)));
 461     std::shared_ptr<GeomAPI_Dir2d> aMidPerpDir(new GeomAPI_Dir2d(-aDir->y(), aDir->x()));
 462     std::shared_ptr<GeomAPI_XY> aMidPnt = aStartPnt->added(aEndPnt)->multiplied(0.5);
 463
 464     double anAngle = anAngleAttr->value() * PI / 180.0;
 465     adjustPeriod(anAngle);
 466     if (anAngle > PI)
 467       aMidPerpDir->reverse();
 468
 469     double aRadius = aRadiusAttr->value();
 470     // The center is placed on a perpendicular bisector of a start-end points segment.
 471     // If the radius is smaller that necessary, start and end points are moved too.
 472     double aDist2 = aRadius * aRadius - aDist * aDist / 4.0;
 473     aDist = aDist2 > 0.0 ? sqrt(aDist2) : 0.0;
 474     // distance between middle point and start point (does not changed if the arc diameter is greater than start-end distance)
 475     aDist2 = sqrt(aRadius * aRadius - aDist * aDist);
 476
 477     std::shared_ptr<GeomAPI_XY> aCenter = aMidPnt->added(aMidPerpDir->xy()->multiplied(aDist));
 478     aStartPnt = aMidPnt->added(aDir->xy()->multiplied(-aDist2));
 479     aEndPnt = aMidPnt->added(aDir->xy()->multiplied(aDist2));
 480
 481     data()->blockSendAttributeUpdated(true);
 482     aCenterAttr->setValue(aCenter->x(), aCenter->y());
 483     aStartAttr->setValue(aStartPnt->x(), aStartPnt->y());
 484     anEndAttr->setValue(aEndPnt->x(), aEndPnt->y());
 485     updateDependentAttributes();
 486     data()->blockSendAttributeUpdated(false);
 487     return;
 488   }
 489   if (theID == ANGLE_ID()) {
 490     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 491       return;
 492     data()->blockSendAttributeUpdated(true);
 493     // move end point and passed point
 494     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 495     double anAngle = anAngleAttr->value() * PI / 180.0;
 496     double sinA = sin(anAngle);
 497     double cosA = cos(anAngle);
 498     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 499     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 500         aStartDir->x() * cosA - aStartDir->y() * sinA,
 501         aStartDir->x() * sinA + aStartDir->y() * cosA));
 502     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 503
 504     anAngle /= 2.0;
 505     sinA = sin(anAngle);
 506     cosA = cos(anAngle);
 507     aDir = std::shared_ptr<GeomAPI_XY>(new GeomAPI_XY(
 508         aStartDir->x() * cosA - aStartDir->y() * sinA,
 509         aStartDir->x() * sinA + aStartDir->y() * cosA));
 510     std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 511         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 512     aPassedPoint->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 513
 514     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 515         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 516     calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 517                             anAngleAttr, aRadiusAttr);
 518     data()->blockSendAttributeUpdated(false);
 519     return;
 520   }
 521
 522   if (theID == CENTER_ID()) {
 523     if (isFeatureValid())
 524       projectEndPoint();
 525     return;
 526   }
 527
 528   AttributeStringPtr aTypeAttr =
 529       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 530   if (!aTypeAttr)
 531     return;
 532   std::string anArcType = aTypeAttr->value();
 533
 534   // update the points in accordance to the changed point changes
 535   if (anArcType == ARC_TYPE_CENTER_START_END()) {
 536     if (!isFeatureValid())
 537       return;
 538     if (theID == END_ID() && isStable()) {
 539       // The arc is under construction, so its end point projected
 540       // on the circle formed by center and start points
 541       projectEndPoint();
 542     }
 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       tangencyArcConstraints();
 640     }
 641   }
 642 }
 643
 644 void SketchPlugin_Arc::setReversed(bool isReversed)
 645 {
 646   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 647   myParamBefore = 0.0;
 648 }
 649
 650 bool SketchPlugin_Arc::isReversed()
 651 {
 652   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 653 }
 654
 655 void SketchPlugin_Arc::tangencyArcConstraints()
 656 {
 657   if (!lastResult())
 658     return;
 659
 660   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 661       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 662   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 663       attribute(TANGENT_POINT_ID()));
 664   if (!aTangPtAttr->attr())
 665     return;
 666
 667   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 668   ObjectPtr aThisArc = aFeature->lastResult();
 669   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 670   ObjectPtr aTangFeature = aFeature->lastResult();
 671
 672   // trying to find constraints to fix the tangency of the arc
 673   std::set<FeaturePtr> aCoincidence;
 674   std::set<FeaturePtr> aTangency;
 675
 676   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 677   std::set<AttributePtr> aRefs = data()->refsToMe();
 678   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 679   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 680   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 681   for (; aRefIt != aRefs.end(); ++aRefIt) {
 682     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 683     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 684       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 685           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 686       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 687           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 688       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 689           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 690         aCoincidence.insert(aConstrFeature);
 691     }
 692     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::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->object() == aThisArc) ||
 698           (aRefAttrB && aRefAttrB->object() == aThisArc))
 699         aTangency.insert(aConstrFeature);
 700     }
 701   }
 702   // search applicable pair of constraints
 703   bool isFound = false;
 704   FeaturePtr aPrevCoincidence, aPrevTangency;
 705   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 706   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 707     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 708         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 709     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 710         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 711     AttributePtr anOtherPoint =
 712         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 713     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 714       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 715           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 716       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 717           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 718       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 719           aRefAttrB->object() : aRefAttrA->object();
 720       if (anOtherPoint->owner() == anOtherObject) {
 721         isFound = true;
 722         aPrevCoincidence = *aCIt;
 723         aPrevTangency = *aTIt;
 724       }
 725     }
 726   }
 727
 728   if (isFound) {
 729     // update previous constraints
 730     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 731         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 732     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 733         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 734     if (aRefAttrA->attr() == aStartAttr)
 735       aRefAttrB->setAttr(aTangPtAttr->attr());
 736     else
 737       aRefAttrA->setAttr(aTangPtAttr->attr());
 738
 739     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 740         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 741     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 742         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 743     if (aRefAttrA->object() == aThisArc)
 744       aRefAttrB->setObject(aTangFeature);
 745     else
 746       aRefAttrA->setObject(aTangFeature);
 747   } else {
 748     // Wait all constraints being removed, then send update events
 749     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 750     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 751     if (isDeleteFlushed)
 752       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 753     // Remove all obtained constraints which use current arc, because
 754     // there is no information which of them were used to build tangency arc.
 755     DocumentPtr aDoc = sketch()->document();
 756     std::set<FeaturePtr> aFeaturesToBeRemoved;
 757     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 758       aFeaturesToBeRemoved.insert(*aCIt);
 759     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 760       aFeaturesToBeRemoved.insert(*aTIt);
 761     ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
 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 }
 800
 801 void SketchPlugin_Arc::projectEndPoint()
 802 {
 803   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 804       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 805   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 806       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 807   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 808       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 809
 810   if (aCenterAttr->pnt()->distance(aStartAttr->pnt()) < tolerance)
 811     return;
 812   data()->blockSendAttributeUpdated(true);
 813   // compute and change the arc end point
 814   std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 815       new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 816   std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 817   if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 818     anEndAttr->setValue(aProjection);
 819   updateDependentAttributes();
 820   data()->blockSendAttributeUpdated(false);
 821 }