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
 130 void SketchPlugin_Arc::execute()
 131 {
 132   SketchPlugin_Sketch* aSketch = sketch();
 133   // result for the arc is set only when all obligatory attributes are initialized,
 134   // otherwise AIS object is used to visualize the arc's preview
 135   if (aSketch && isFeatureValid()) {
 136     ResultPtr aLastResult = lastResult();
 137     bool hasResult = aLastResult && aLastResult.get();
 138
 139     // compute a circle point in 3D view
 140     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 141         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 142     // compute the arc start point
 143     std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 144         GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 145
 146     std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 147     // make a visible point
 148     std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 149     std::shared_ptr<ModelAPI_ResultConstruction> aConstr1 = document()->createConstruction(
 150         data(), 0);
 151     aConstr1->setShape(aCenterPointShape);
 152     aConstr1->setIsInHistory(false);
 153     setResult(aConstr1, 0);
 154
 155     // make a visible circle
 156     std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 157         aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 158     std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 159     std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 160
 161     // compute and change the arc end point
 162     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 163         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 164     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 165         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 166     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 167     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 168       anEndAttr->setValue(aProjection);
 169     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
 170     AttributeBooleanPtr isInversed =
 171         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 172
 173     std::shared_ptr<GeomAPI_Dir> anXDir(new GeomAPI_Dir(aStartPoint->xyz()->decreased(aCenter->xyz())));
 174     std::shared_ptr<GeomAPI_Ax2> anAx2(new GeomAPI_Ax2(aCenter, aNormal, anXDir));
 175     std::shared_ptr<GeomAPI_Circ> aCirc(new GeomAPI_Circ(anAx2, aCenter->distance(aStartPoint)));
 176     double aParameterNew = 0.0;
 177     if(aCirc->parameter(aEndPoint, paramTolerance, aParameterNew)) {
 178       if(0 <= myParamBefore && myParamBefore <= PI / 2.0
 179         && PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0) {
 180           isInversed->setValue(true);
 181       } else if(PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0
 182         && 0 <= aParameterNew && aParameterNew <= PI / 2.0) {
 183           isInversed->setValue(false);
 184       }
 185     }
 186     myParamBefore = aParameterNew;
 187
 188     std::shared_ptr<GeomAPI_Shape> aCircleShape;
 189     if(!isInversed->value()) {
 190       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 191     } else {
 192       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
 193     }
 194
 195     if (aCircleShape) {
 196       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
 197           data(), 1);
 198       aConstr2->setShape(aCircleShape);
 199       aConstr2->setIsInHistory(false);
 200       setResult(aConstr2, 1);
 201     }
 202
 203     // update radius and angle
 204     updateDependentAttributes();
 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
 223       std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
 224       if (aCenterAttr->isInitialized()) {
 225         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 226         // make a visible point
 227         std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::point(aCenter);
 228         aShapes.push_back(aCenterPointShape);
 229
 230         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 231             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 232         std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
 233             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 234         AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 235             data()->attribute(ARC_TYPE()));
 236
 237         if (aStartAttr->isInitialized()) {
 238           // make a visible circle
 239           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 240               aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 241           bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
 242           if (aHasPlane) {
 243             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 244             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 245             std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
 246             if (aTypeAttr && aTypeAttr->isInitialized() &&
 247                 aTypeAttr->value() == ARC_TYPE_THREE_POINTS() && aEndAttr->isInitialized())
 248               aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
 249
 250             std::shared_ptr<GeomAPI_Shape> aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(
 251                                                             aCenter, aStartPoint, aEndPoint, aNormal);
 252             if (aCircleShape)
 253               aShapes.push_back(aCircleShape);
 254           }
 255         }
 256       }
 257       if (!aShapes.empty()) {
 258         std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
 259         AISObjectPtr anAIS = thePrevious;
 260         if (!anAIS)
 261           anAIS = AISObjectPtr(new GeomAPI_AISObject);
 262         anAIS->createShape(aCompound);
 263         anAIS->setWidth(3);
 264         return anAIS;
 265       }
 266     }
 267   }
 268   return AISObjectPtr();
 269 }
 270
 271 void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
 272 {
 273   std::shared_ptr<ModelAPI_Data> aData = data();
 274   if (!aData->isValid())
 275     return;
 276
 277   aData->blockSendAttributeUpdated(true);
 278
 279   myStartUpdate = true;
 280   myEndUpdate = true;
 281   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 282       aData->attribute(SketchPlugin_Arc::START_ID()));
 283   aPoint2->move(theDeltaX, theDeltaY);
 284
 285   std::shared_ptr<GeomDataAPI_Point2D> aPoint3 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 286       aData->attribute(SketchPlugin_Arc::END_ID()));
 287   aPoint3->move(theDeltaX, theDeltaY);
 288   myStartUpdate = false;
 289   myEndUpdate = false;
 290
 291   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 292       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
 293   aPoint1->move(theDeltaX, theDeltaY);
 294
 295   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 296       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
 297   aPassedPoint->move(theDeltaX, theDeltaY);
 298   aData->blockSendAttributeUpdated(false);
 299 }
 300
 301 bool SketchPlugin_Arc::isFixed() {
 302   return data()->selection(EXTERNAL_ID())->context().get() != NULL;
 303 }
 304
 305 bool SketchPlugin_Arc::isFeatureValid()
 306 {
 307   AttributeStringPtr anArcTypeAttr =
 308       std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
 309   if (!anArcTypeAttr)
 310     return false;
 311   std::string anArcType = anArcTypeAttr->value();
 312
 313   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 314       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
 315   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 316       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 317   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 318       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 319   std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
 320       GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 321
 322   bool isValid = false;
 323   if (anArcType == ARC_TYPE_THREE_POINTS())
 324     isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
 325   else
 326     isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 327
 328   return isValid;
 329 }
 330
 331 static inline void adjustPeriod(double& theParam)
 332 {
 333   static const double PERIOD = 2.0 * PI;
 334   while (theParam < 0.0) theParam += PERIOD;
 335   while (theParam >= PERIOD) theParam -= PERIOD;
 336 }
 337
 338 static inline void calculateArcAngleRadius(
 339     const std::shared_ptr<GeomAPI_Circ2d>& theCircle,
 340     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 341     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 342     const std::shared_ptr<GeomAPI_Pnt2d>& thePassedPoint,
 343     AttributeDoublePtr theAngleAttr,
 344     AttributeDoublePtr theRadiusAttr)
 345 {
 346   double aStartParam, aEndParam, aPassedParam;
 347   theCircle->parameter(theStartPoint, paramTolerance, aStartParam);
 348   theCircle->parameter(theEndPoint, paramTolerance, aEndParam);
 349   theCircle->parameter(thePassedPoint, paramTolerance, aPassedParam);
 350   adjustPeriod(aStartParam);
 351   adjustPeriod(aEndParam);
 352   adjustPeriod(aPassedParam);
 353
 354   if (aPassedParam >= aStartParam && aPassedParam <= aEndParam)
 355     theAngleAttr->setValue((aEndParam - aStartParam) * 180.0 / PI);
 356   else
 357     theAngleAttr->setValue((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 358   theRadiusAttr->setValue(theCircle->radius());
 359 }
 360
 361 static inline void calculatePassedPoint(
 362     const std::shared_ptr<GeomAPI_Pnt2d>& theCenter,
 363     const std::shared_ptr<GeomAPI_Pnt2d>& theStartPoint,
 364     const std::shared_ptr<GeomAPI_Pnt2d>& theEndPoint,
 365     bool theArcReversed,
 366     std::shared_ptr<GeomDataAPI_Point2D> thePassedPoint)
 367 {
 368   if (theCenter->distance(theStartPoint) < tolerance ||
 369       theCenter->distance(theEndPoint) < tolerance)
 370     return;
 371
 372   std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 373       theStartPoint->xy()->decreased(theCenter->xy())));
 374   std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 375       theEndPoint->xy()->decreased(theCenter->xy())));
 376   std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 377   if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 378     // start and end directions are opposite, so middle direction will be orthogonal
 379     aMidDirXY->setX(-aStartDir->y());
 380     aMidDirXY->setY(aStartDir->x());
 381   }
 382   std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 383   if ((aStartDir->cross(aMidDir) > 0) ^ !theArcReversed)
 384     aMidDir->reverse();
 385
 386   double aRadius = theCenter->distance(theStartPoint);
 387   std::shared_ptr<GeomAPI_XY> aPassedPnt = theCenter->xy()->added( aMidDir->xy()->multiplied(aRadius) );
 388   thePassedPoint->setValue(aPassedPnt->x(), aPassedPnt->y());
 389 }
 390
 391 void SketchPlugin_Arc::updateDependentAttributes()
 392 {
 393   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 394       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 395   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 396       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 397   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 398       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 399   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 400       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 401   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 402       data()->attribute(RADIUS_ID()));
 403   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 404       data()->attribute(ANGLE_ID()));
 405
 406   if (!aPassedPoint)
 407     return;
 408
 409   data()->blockSendAttributeUpdated(true);
 410
 411   calculatePassedPoint(aCenterAttr->pnt(), aStartAttr->pnt(), anEndAttr->pnt(),
 412                        isReversed(), aPassedPoint);
 413   if (aRadiusAttr && anAngleAttr) {
 414     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 415         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 416     if (aCircle->implPtr<void*>())
 417       calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 418                               anAngleAttr, aRadiusAttr);
 419   }
 420   data()->blockSendAttributeUpdated(false);
 421 }
 422
 423
 424 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
 425 {
 426   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 427       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 428   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 429       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 430   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 431       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 432   // the second condition for unability to move external segments anywhere
 433   if (theID == EXTERNAL_ID() || isFixed()) {
 434     std::shared_ptr<GeomAPI_Shape> aSelection = data()->selection(EXTERNAL_ID())->value();
 435     // update arguments due to the selection value
 436     if (aSelection && !aSelection->isNull() && aSelection->isEdge()) {
 437       std::shared_ptr<GeomAPI_Edge> anEdge( new GeomAPI_Edge(aSelection));
 438       std::shared_ptr<GeomAPI_Circ> aCirc = anEdge->circle();
 439       if (aCirc.get()) {
 440         aStartAttr->setValue(sketch()->to2D(anEdge->firstPoint()));
 441         anEndAttr->setValue(sketch()->to2D(anEdge->lastPoint()));
 442         aCenterAttr->setValue(sketch()->to2D(aCirc->center()));
 443       }
 444     }
 445     return;
 446   }
 447
 448   AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 449       data()->attribute(RADIUS_ID()));
 450   AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 451       data()->attribute(ANGLE_ID()));
 452
 453   if (theID == RADIUS_ID()) {
 454     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized())
 455       return;
 456     // move center and passed point
 457     std::shared_ptr<GeomAPI_XY> aStartPnt = aStartAttr->pnt()->xy();
 458     std::shared_ptr<GeomAPI_XY> aEndPnt = anEndAttr->pnt()->xy();
 459     double aDist = aStartPnt->distance(aEndPnt);
 460     if (fabs(aDist) < tolerance)
 461       return;
 462     std::shared_ptr<GeomAPI_Dir2d> aDir(new GeomAPI_Dir2d(aEndPnt->decreased(aStartPnt)));
 463     std::shared_ptr<GeomAPI_Dir2d> aMidPerpDir(new GeomAPI_Dir2d(-aDir->y(), aDir->x()));
 464     std::shared_ptr<GeomAPI_XY> aMidPnt = aStartPnt->added(aEndPnt)->multiplied(0.5);
 465
 466     double anAngle = anAngleAttr->value() * PI / 180.0;
 467     adjustPeriod(anAngle);
 468     if (anAngle > PI)
 469       aMidPerpDir->reverse();
 470
 471     double aRadius = aRadiusAttr->value();
 472     // The center is placed on a perpendicular bisector of a start-end points segment.
 473     // If the radius is smaller that necessary, start and end points are moved too.
 474     double aDist2 = aRadius * aRadius - aDist * aDist / 4.0;
 475     aDist = aDist2 > 0.0 ? sqrt(aDist2) : 0.0;
 476     // distance between middle point and start point (does not changed if the arc diameter is greater than start-end distance)
 477     aDist2 = sqrt(aRadius * aRadius - aDist * aDist);
 478
 479     std::shared_ptr<GeomAPI_XY> aCenter = aMidPnt->added(aMidPerpDir->xy()->multiplied(aDist));
 480     aStartPnt = aMidPnt->added(aDir->xy()->multiplied(-aDist2));
 481     aEndPnt = aMidPnt->added(aDir->xy()->multiplied(aDist2));
 482
 483     data()->blockSendAttributeUpdated(true);
 484     aCenterAttr->setValue(aCenter->x(), aCenter->y());
 485     aStartAttr->setValue(aStartPnt->x(), aStartPnt->y());
 486     anEndAttr->setValue(aEndPnt->x(), aEndPnt->y());
 487     updateDependentAttributes();
 488     data()->blockSendAttributeUpdated(false);
 489     return;
 490   }
 491   if (theID == ANGLE_ID()) {
 492     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 493       return;
 494     data()->blockSendAttributeUpdated(true);
 495     // move end point and passed point
 496     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 497     double anAngle = anAngleAttr->value() * PI / 180.0;
 498     double sinA = sin(anAngle);
 499     double cosA = cos(anAngle);
 500     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 501     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 502         aStartDir->x() * cosA - aStartDir->y() * sinA,
 503         aStartDir->x() * sinA + aStartDir->y() * cosA));
 504     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 505
 506     anAngle /= 2.0;
 507     sinA = sin(anAngle);
 508     cosA = cos(anAngle);
 509     aDir = std::shared_ptr<GeomAPI_XY>(new GeomAPI_XY(
 510         aStartDir->x() * cosA - aStartDir->y() * sinA,
 511         aStartDir->x() * sinA + aStartDir->y() * cosA));
 512     std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 513         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(PASSED_POINT_ID()));
 514     aPassedPoint->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 515
 516     std::shared_ptr<GeomAPI_Circ2d> aCircle(
 517         new GeomAPI_Circ2d(aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt()));
 518     calculateArcAngleRadius(aCircle, aStartAttr->pnt(), anEndAttr->pnt(), aPassedPoint->pnt(),
 519                             anAngleAttr, aRadiusAttr);
 520     data()->blockSendAttributeUpdated(false);
 521     return;
 522   }
 523
 524   if (theID == CENTER_ID()) {
 525     if (isFeatureValid())
 526       projectEndPoint();
 527     return;
 528   }
 529
 530   AttributeStringPtr aTypeAttr =
 531       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 532   if (!aTypeAttr)
 533     return;
 534   std::string anArcType = aTypeAttr->value();
 535
 536   // update the points in accordance to the changed point changes
 537   if (anArcType == ARC_TYPE_CENTER_START_END()) {
 538     if (!isFeatureValid())
 539       return;
 540     if (theID == END_ID() && isStable()) {
 541       // The arc is under construction, so its end point projected
 542       // on the circle formed by center and start points
 543       projectEndPoint();
 544     }
 545     updateDependentAttributes();
 546   }
 547   else if (anArcType == ARC_TYPE_THREE_POINTS() &&
 548           (theID == START_ID() || theID == END_ID() || theID == PASSED_POINT_ID())) {
 549     data()->blockSendAttributeUpdated(true);
 550
 551     std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
 552     int aNbInitialized = 0;
 553     for (int i = 1; i <= 3; ++i) {
 554       std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
 555           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
 556       if (aCurPnt->isInitialized())
 557         aPoints[aNbInitialized++] = aCurPnt->pnt();
 558     }
 559
 560     if (aNbInitialized == 1)
 561       aCenterAttr->setValue(aPoints[0]->x(), aPoints[0]->y());
 562     else if (aNbInitialized == 2) {
 563       // calculate center point, which gives a quarter of circle for the given start and end points
 564       std::shared_ptr<GeomAPI_Pnt2d> aStartPnt = aPoints[0];
 565       std::shared_ptr<GeomAPI_Pnt2d> aEndPnt = aPoints[1];
 566       std::shared_ptr<GeomAPI_XY> aDir = aEndPnt->xy()->decreased(aStartPnt->xy())->multiplied(0.5);
 567       double x = aDir->x();
 568       double y = aDir->y();
 569       aDir->setX(x - y);
 570       aDir->setY(y + x);
 571       std::shared_ptr<GeomAPI_XY> aCenter = aStartPnt->xy()->added(aDir);
 572       double aRadius = sqrt(aDir->dot(aDir));
 573
 574       aCenterAttr->setValue(aCenter->x(), aCenter->y());
 575       aRadiusAttr->setValue(aRadius);
 576       anAngleAttr->setValue(90.0);
 577     }
 578     else {
 579       std::shared_ptr<GeomAPI_Circ2d> aCircle(
 580           new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
 581
 582       std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
 583       if (aCenter) {
 584         aCenterAttr->setValue(aCenter);
 585         if (theID == START_ID() || theID == END_ID())
 586           updateDependentAttributes();
 587         else
 588           calculateArcAngleRadius(aCircle, aPoints[0], aPoints[1], aPoints[2],
 589                                   anAngleAttr, aRadiusAttr);
 590       }
 591     }
 592
 593     data()->blockSendAttributeUpdated(false);
 594   }
 595   else if (anArcType == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
 596     SketchPlugin_Sketch* aSketch = sketch();
 597     AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 598         data()->attribute(TANGENT_POINT_ID()));
 599
 600     if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
 601       data()->blockSendAttributeUpdated(true);
 602       // compute orthogonal direction
 603       std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
 604       std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
 605           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
 606       std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
 607       FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
 608       std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
 609           aTangFeature->lastResult()->shape());
 610       if (aTangEdge->isLine()) {
 611         std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
 612         std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
 613         std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
 614         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
 615       }
 616       else if (aTangEdge->isArc()) {
 617         std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
 618         std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
 619         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
 620             new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
 621       }
 622
 623       // compute parameters of the middle perpendicular
 624       std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
 625       std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
 626       std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
 627       std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
 628           new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
 629
 630       // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
 631       std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
 632       std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
 633       std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
 634       if (aCenter) {
 635         aCenterAttr->setValue(aCenter);
 636         aStartAttr->setValue(aTangPnt2d);
 637         updateDependentAttributes();
 638       }
 639
 640       data()->blockSendAttributeUpdated(false);
 641
 642       if (theID == TANGENT_POINT_ID())
 643         tangencyArcConstraints();
 644     }
 645   }
 646 }
 647
 648 void SketchPlugin_Arc::setReversed(bool isReversed)
 649 {
 650   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 651   myParamBefore = 0.0;
 652 }
 653
 654 bool SketchPlugin_Arc::isReversed()
 655 {
 656   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 657 }
 658
 659 void SketchPlugin_Arc::tangencyArcConstraints()
 660 {
 661   if (!lastResult())
 662     return;
 663
 664   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 665       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 666   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 667       attribute(TANGENT_POINT_ID()));
 668   if (!aTangPtAttr->attr())
 669     return;
 670
 671   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 672   ObjectPtr aThisArc = aFeature->lastResult();
 673   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 674   ObjectPtr aTangFeature = aFeature->lastResult();
 675
 676   // trying to find constraints to fix the tangency of the arc
 677   std::set<FeaturePtr> aCoincidence;
 678   std::set<FeaturePtr> aTangency;
 679
 680   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 681   std::set<AttributePtr> aRefs = data()->refsToMe();
 682   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 683   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 684   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 685   for (; aRefIt != aRefs.end(); ++aRefIt) {
 686     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 687     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 688       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 689           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 690       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 691           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 692       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 693           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 694         aCoincidence.insert(aConstrFeature);
 695     }
 696     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 697       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 698           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 699       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 700           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 701       if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
 702           (aRefAttrB && aRefAttrB->object() == aThisArc))
 703         aTangency.insert(aConstrFeature);
 704     }
 705   }
 706   // search applicable pair of constraints
 707   bool isFound = false;
 708   FeaturePtr aPrevCoincidence, aPrevTangency;
 709   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 710   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 711     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 712         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 713     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 714         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 715     AttributePtr anOtherPoint =
 716         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 717     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 718       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 719           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 720       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 721           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 722       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 723           aRefAttrB->object() : aRefAttrA->object();
 724       if (anOtherPoint->owner() == anOtherObject) {
 725         isFound = true;
 726         aPrevCoincidence = *aCIt;
 727         aPrevTangency = *aTIt;
 728       }
 729     }
 730   }
 731
 732   if (isFound) {
 733     // update previous constraints
 734     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 735         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 736     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 737         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 738     if (aRefAttrA->attr() == aStartAttr)
 739       aRefAttrB->setAttr(aTangPtAttr->attr());
 740     else
 741       aRefAttrA->setAttr(aTangPtAttr->attr());
 742
 743     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 744         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 745     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 746         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 747     if (aRefAttrA->object() == aThisArc)
 748       aRefAttrB->setObject(aTangFeature);
 749     else
 750       aRefAttrA->setObject(aTangFeature);
 751   } else {
 752     // Wait all constraints being removed, then send update events
 753     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 754     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 755     if (isDeleteFlushed)
 756       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 757     // Remove all obtained constraints which use current arc, because
 758     // there is no information which of them were used to build tangency arc.
 759     DocumentPtr aDoc = sketch()->document();
 760     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 761       aDoc->removeFeature(*aCIt);
 762     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 763       aDoc->removeFeature(*aTIt);
 764     // Send events to update the sub-features by the solver.
 765     if (isDeleteFlushed)
 766       Events_Loop::loop()->setFlushed(aDeleteEvent, true);
 767     else
 768       Events_Loop::loop()->flush(aDeleteEvent);
 769
 770     // Wait all constraints being created, then send update events
 771     static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 772     bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 773     if (isUpdateFlushed)
 774       Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 775
 776     // Create new constraints
 777     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 778     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 779         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 780     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 781         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 782     aRefAttrA->setAttr(aStartAttr);
 783     aRefAttrB->setAttr(aTangPtAttr->attr());
 784     aConstraint->execute();
 785     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 786
 787     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 788     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 789         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 790     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 791         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 792     aRefAttrA->setObject(aThisArc);
 793     aRefAttrB->setObject(aTangFeature);
 794     aConstraint->execute();
 795     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 796
 797     // Send events to update the sub-features by the solver.
 798     if(isUpdateFlushed)
 799       Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 800   }
 801 }
 802
 803 void SketchPlugin_Arc::projectEndPoint()
 804 {
 805   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 806       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 807   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 808       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 809   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 810       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 811
 812   if (aCenterAttr->pnt()->distance(aStartAttr->pnt()) < tolerance)
 813     return;
 814   data()->blockSendAttributeUpdated(true);
 815   // compute and change the arc end point
 816   std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 817       new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 818   std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 819   if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 820     anEndAttr->setValue(aProjection);
 821   updateDependentAttributes();
 822   data()->blockSendAttributeUpdated(false);
 823 }