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_Vertex.h>
  33 #include <GeomAPI_XY.h>
  34 #include <GeomDataAPI_Point2D.h>
  35 #include <GeomDataAPI_Dir.h>
  36 #include <GeomAlgoAPI_PointBuilder.h>
  37 #include <GeomAlgoAPI_EdgeBuilder.h>
  38 #include <GeomAlgoAPI_CompoundBuilder.h>
  39 // for sqrt on Linux
  40 #include <math.h>
  41
  42 const double tolerance = 1e-7;
  43 const double paramTolerance = 1.e-4;
  44 const double PI = 3.141592653589793238463;
  45
  46 namespace {
  47   static const std::string& POINT_ID(int theIndex)
  48   {
  49     switch (theIndex) {
  50     case 1: return SketchPlugin_Arc::START_ID();
  51     case 2: return SketchPlugin_Arc::END_ID();
  52     case 3: return SketchPlugin_Arc::PASSED_POINT_ID();
  53     }
  54
  55     static const std::string DUMMY;
  56     return DUMMY;
  57   }
  58 }
  59
  60
  61
  62 SketchPlugin_Arc::SketchPlugin_Arc()
  63     : SketchPlugin_SketchEntity()
  64 {
  65   myStartUpdate = false;
  66   myEndUpdate = false;
  67   // default values
  68   myXEndBefore = 0;
  69   myYEndBefore = 0;
  70
  71   myParamBefore = PI * 2.0;
  72 }
  73
  74 void SketchPlugin_Arc::initDerivedClassAttributes()
  75 {
  76   data()->addAttribute(CENTER_ID(), GeomDataAPI_Point2D::typeId());
  77   data()->addAttribute(START_ID(), GeomDataAPI_Point2D::typeId());
  78   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
  79     GeomDataAPI_Point2D>(data()->addAttribute(END_ID(), GeomDataAPI_Point2D::typeId()));
  80   data()->addAttribute(EXTERNAL_ID(), ModelAPI_AttributeSelection::typeId());
  81   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), EXTERNAL_ID());
  82
  83   AttributeBooleanPtr isInversed = std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(
  84     data()->addAttribute(INVERSED_ID(), ModelAPI_AttributeBoolean::typeId()));
  85
  86   // get the initial values
  87   if (anEndAttr->isInitialized()) {
  88     myXEndBefore = anEndAttr->x();
  89     myYEndBefore = anEndAttr->y();
  90   }
  91
  92   AttributeStringPtr anArcType = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
  93     data()->addAttribute(ARC_TYPE(), ModelAPI_AttributeString::typeId()));
  94
  95   data()->addAttribute(PASSED_POINT_ID(), GeomDataAPI_Point2D::typeId());
  96   data()->addAttribute(TANGENT_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
  97   data()->addAttribute(RADIUS_ID(), ModelAPI_AttributeDouble::typeId());
  98   data()->addAttribute(ANGLE_ID(), ModelAPI_AttributeDouble::typeId());
  99
 100   // set after all to avoid in attributeChanged reference to not existing attributes
 101   if (!isInversed->isInitialized())
 102     isInversed->setValue(false);
 103   anArcType->setValue(ARC_TYPE_CENTER_START_END());
 104 }
 105
 106 void SketchPlugin_Arc::execute()
 107 {
 108   SketchPlugin_Sketch* aSketch = sketch();
 109   // result for the arc is set only when all obligatory attributes are initialized,
 110   // otherwise AIS object is used to visualize the arc's preview
 111   if (aSketch && isFeatureValid()) {
 112     bool hasResult = lastResult().get() != NULL;
 113
 114     // compute a circle point in 3D view
 115     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 116         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 117     // compute the arc start point
 118     std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 119         GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 120
 121     std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 122     // make a visible point
 123     std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::vertex(aCenter);
 124     std::shared_ptr<ModelAPI_ResultConstruction> aConstr1 = document()->createConstruction(
 125         data(), 0);
 126     aConstr1->setShape(aCenterPointShape);
 127     aConstr1->setIsInHistory(false);
 128     setResult(aConstr1, 0);
 129
 130     // make a visible circle
 131     std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 132         aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 133     std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 134     std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 135
 136     // compute and change the arc end point
 137     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 138         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 139     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 140         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 141     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 142     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 143       anEndAttr->setValue(aProjection);
 144     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
 145     AttributeBooleanPtr isInversed =
 146         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 147
 148     std::shared_ptr<GeomAPI_Shape> aCircleShape;
 149     if(!isInversed->value()) {
 150       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 151     } else {
 152       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
 153     }
 154
 155     if (aCircleShape) {
 156       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
 157           data(), 1);
 158       aConstr2->setShape(aCircleShape);
 159       aConstr2->setIsInHistory(false);
 160       setResult(aConstr2, 1);
 161     }
 162   }
 163 }
 164
 165 AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
 166 {
 167   SketchPlugin_Sketch* aSketch = sketch();
 168   if (aSketch) {
 169     // if the feature is valid, the execute() method should be performed, AIS object is empty
 170     if (!isFeatureValid()) {
 171       // compute a circle point in 3D view
 172       std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 173           GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 174
 175       std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
 176       if (aCenterAttr->isInitialized()) {
 177         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 178
 179         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 180             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 181         std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
 182             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 183         AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 184             data()->attribute(ARC_TYPE()));
 185
 186         if (aStartAttr->isInitialized()) {
 187           // make a visible circle
 188           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 189               aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 190           bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
 191           if (aHasPlane) {
 192             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 193             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 194             std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
 195             if (aTypeAttr && aTypeAttr->isInitialized() &&
 196                 aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) {
 197               if (aEndAttr->isInitialized() && //
 198                   aEndAttr->pnt()->distance(aStartAttr->pnt()) > tolerance) {
 199                 aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
 200                 std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 201                   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 202                 if (!aPassedAttr->isInitialized()) { // calculate the appropriate center for the presentation
 203                   // check that center is bad for the current start and end and must be recomputed
 204                   std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(
 205                     aCenterAttr->pnt(), aStartAttr->pnt()));
 206                   std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aEndAttr->pnt());
 207                   if (!aProjection.get() || aEndAttr->pnt()->distance(aProjection) > tolerance) {
 208                     std::shared_ptr<GeomAPI_XY> aDir =
 209                       aEndAttr->pnt()->xy()->decreased(aStartAttr->pnt()->xy())->multiplied(0.5);
 210                     double x = aDir->x();
 211                     double y = aDir->y();
 212                     aDir->setX(x - y);
 213                     aDir->setY(y + x);
 214                     std::shared_ptr<GeomAPI_XY> aCenterXY = aStartAttr->pnt()->xy()->added(aDir);
 215                     aCenter = aSketch->to3D(aCenterXY->x(), aCenterXY->y());
 216                   }
 217                 }
 218               } else { // issue #1695: don't display circle if initialized only start point
 219                 return AISObjectPtr();
 220               }
 221             }
 222             AttributeBooleanPtr isInversed =
 223               std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 224
 225             std::shared_ptr<GeomAPI_Shape> aCircleShape =
 226               (isInversed->isInitialized() && isInversed->value()) ?
 227                 GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal) :
 228                 GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 229
 230             if (aCircleShape)
 231               aShapes.push_back(aCircleShape);
 232           }
 233         }
 234         // make a visible point
 235         std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::vertex(aCenter);
 236         aShapes.push_back(aCenterPointShape);
 237       }
 238       if (!aShapes.empty()) {
 239         std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
 240         AISObjectPtr anAIS = thePrevious;
 241         if (!anAIS)
 242           anAIS = AISObjectPtr(new GeomAPI_AISObject);
 243         anAIS->createShape(aCompound);
 244         anAIS->setWidth(3);
 245         return anAIS;
 246       }
 247     }
 248   }
 249   return AISObjectPtr();
 250 }
 251
 252 void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
 253 {
 254   std::shared_ptr<ModelAPI_Data> aData = data();
 255   if (!aData->isValid())
 256     return;
 257
 258   aData->blockSendAttributeUpdated(true);
 259
 260   myStartUpdate = true;
 261   myEndUpdate = true;
 262   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 263       aData->attribute(SketchPlugin_Arc::START_ID()));
 264   if (aPoint2->isInitialized())
 265     aPoint2->move(theDeltaX, theDeltaY);
 266
 267   std::shared_ptr<GeomDataAPI_Point2D> aPoint3 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 268       aData->attribute(SketchPlugin_Arc::END_ID()));
 269   if (aPoint3->isInitialized())
 270     aPoint3->move(theDeltaX, theDeltaY);
 271   myStartUpdate = false;
 272   myEndUpdate = false;
 273
 274   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 275       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
 276   if (aPoint1->isInitialized())
 277     aPoint1->move(theDeltaX, theDeltaY);
 278
 279   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 280       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
 281   if (aPassedPoint->isInitialized())
 282     aPassedPoint->move(theDeltaX, theDeltaY);
 283   aData->blockSendAttributeUpdated(false);
 284 }
 285
 286 bool SketchPlugin_Arc::isFixed() {
 287   return data()->selection(EXTERNAL_ID())->context().get() != NULL;
 288 }
 289
 290 bool SketchPlugin_Arc::isFeatureValid()
 291 {
 292   AttributeStringPtr anArcTypeAttr =
 293       std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
 294   if (!anArcTypeAttr)
 295     return false;
 296   std::string anArcType = anArcTypeAttr->value();
 297
 298   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 299       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
 300   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 301       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 302   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 303       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 304   std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
 305       GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 306
 307   bool isValid = false;
 308   if (anArcType == ARC_TYPE_THREE_POINTS())
 309     isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
 310   else
 311     isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 312
 313   return isValid;
 314 }
 315
 316 static inline void adjustPeriod(double& theParam)
 317 {
 318   static const double PERIOD = 2.0 * PI;
 319   while (theParam < 0.0) theParam += PERIOD;
 320   while (theParam >= PERIOD) theParam -= PERIOD;
 321 }
 322
 323 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
 324 {
 325   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 326       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 327   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 328       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 329   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 330       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 331   // the second condition for unability to move external segments anywhere
 332   if (theID == EXTERNAL_ID() || isFixed()) {
 333     std::shared_ptr<GeomAPI_Shape> aSelection = data()->selection(EXTERNAL_ID())->value();
 334     if (!aSelection) {
 335       // empty shape in selection shows that the shape is equal to context
 336       ResultPtr anExtRes = selection(EXTERNAL_ID())->context();
 337       if (anExtRes)
 338         aSelection = anExtRes->shape();
 339     }
 340     // update arguments due to the selection value
 341     if (aSelection && !aSelection->isNull() && aSelection->isEdge()) {
 342       std::shared_ptr<GeomAPI_Edge> anEdge( new GeomAPI_Edge(aSelection));
 343       std::shared_ptr<GeomAPI_Circ> aCirc = anEdge->circle();
 344       if (aCirc.get()) {
 345         aStartAttr->setValue(sketch()->to2D(anEdge->firstPoint()));
 346         anEndAttr->setValue(sketch()->to2D(anEdge->lastPoint()));
 347         aCenterAttr->setValue(sketch()->to2D(aCirc->center()));
 348
 349         data()->real(RADIUS_ID())->setValue(aCirc->radius());
 350         double aStartAngle, aEndAngle;
 351         anEdge->getRange(aStartAngle, aEndAngle);
 352         data()->real(ANGLE_ID())->setValue(aEndAngle - aStartAngle);
 353         myParamBefore = aEndAngle;
 354         adjustPeriod(myParamBefore);
 355       }
 356     }
 357     return;
 358   }
 359   AttributeStringPtr aTypeAttr =
 360       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 361
 362   // this is before others since here end attribute may be changed, but with the special behavior
 363   if (aTypeAttr->value() == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
 364     SketchPlugin_Sketch* aSketch = sketch();
 365     AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 366         data()->attribute(TANGENT_POINT_ID()));
 367
 368     if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
 369       // compute orthogonal direction
 370       std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
 371       std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
 372           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
 373       std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
 374       if (aTangPnt2d->isEqual(anEndAttr->pnt()))
 375         return;
 376       FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
 377       std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
 378           aTangFeature->lastResult()->shape());
 379       if (aTangEdge->isLine()) {
 380         std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
 381         std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
 382         std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
 383         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
 384       }
 385       else if (aTangEdge->isArc()) {
 386         std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
 387         std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
 388         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
 389             new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
 390       }
 391
 392       // compute parameters of the middle perpendicular
 393       std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
 394       std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
 395       std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
 396       std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
 397           new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
 398
 399       // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
 400       std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
 401       std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
 402       std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
 403       if (aCenter) {
 404         data()->blockSendAttributeUpdated(true);
 405         aCenterAttr->setValue(aCenter);
 406         aStartAttr->setValue(aTangPnt2d);
 407         data()->blockSendAttributeUpdated(false);
 408       }
 409
 410       tangencyArcConstraints();
 411     }
 412     return;
 413   }
 414
 415   // if changed the base attributes, update all other (is necessary) without recursion
 416   if (theID == CENTER_ID() || theID == START_ID() || theID == END_ID() || theID == ARC_TYPE()) {
 417     if (!isFeatureValid())
 418       return;
 419     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 420     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 421     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 422     double aRadius = aCenter->distance(aStart);
 423     if (aRadius < tolerance)
 424       return;
 425     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(aCenter, aStart));
 426
 427     data()->blockSendAttributeUpdated(true);
 428     if (theID == END_ID() && isStable()) {
 429       // The arc is under construction, so its end point projected
 430       // on the circle formed by center and start points
 431       std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEnd);
 432       if (aProjection && anEnd->distance(aProjection) > tolerance) {
 433         anEndAttr->setValue(aProjection);
 434         anEnd = aProjection;
 435       }
 436     }
 437     // update all other attributes due to the base attributes values
 438     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // update passed point due to start, end and center
 439       if (aCenter->distance(aStart) > tolerance && aCenter->distance(anEnd) > tolerance) {
 440         // project passed point t othe circle
 441         std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 442           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 443         if (aPassedAttr->isInitialized()) {
 444           std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aPassedAttr->pnt());
 445           if (aProjection && aPassedAttr->pnt()->distance(aProjection) > tolerance) {
 446             aPassedAttr->setValue(aProjection);
 447           }
 448         } else { // initialize it by some middle - value
 449           std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 450             aStart->xy()->decreased(aCenter->xy())));
 451           std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 452             anEnd->xy()->decreased(aCenter->xy())));
 453           std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 454           if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 455             // start and end directions are opposite, so middle direction will be orthogonal
 456             aMidDirXY->setX(-aStartDir->y());
 457             aMidDirXY->setY(aStartDir->x());
 458           }
 459           std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 460           if ((aStartDir->cross(aMidDir) > 0) ^ !isReversed())
 461             aMidDir->reverse();
 462           std::shared_ptr<GeomAPI_XY> aPassedPnt =
 463             aCenter->xy()->added(aMidDir->xy()->multiplied(aCenter->distance(aStart)));
 464           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()))->
 465             setValue(aPassedPnt->x(), aPassedPnt->y());
 466         }
 467       }
 468     }
 469     // update radius and angle
 470     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 471         data()->attribute(RADIUS_ID()));
 472     aRadiusAttr->setValue(aRadius);
 473     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 474         data()->attribute(ANGLE_ID()));
 475     std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter, aStart));
 476     double aStartParam, aEndParam;
 477     aCircle->parameter(aStart, paramTolerance, aStartParam);
 478     aCircle->parameter(anEnd, paramTolerance, aEndParam);
 479     adjustPeriod(aStartParam);
 480     adjustPeriod(aEndParam);
 481     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // use the passed point for the angle calculation
 482       std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 483         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 484       double aPassedParam;
 485       aCircle->parameter(aPassedAttr->pnt(), paramTolerance, aPassedParam);
 486       adjustPeriod(aPassedParam);
 487       double aNewAngle = aPassedParam >= aStartParam && aPassedParam <= aEndParam ?
 488         ((aEndParam - aStartParam) * 180.0 / PI) :
 489         ((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 490       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 491         anAngleAttr->setValue(aNewAngle);
 492     } else {
 493       double aNewAngle = (aEndParam - aStartParam) * 180.0 / PI;
 494       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 495         anAngleAttr->setValue(aNewAngle);
 496     }
 497
 498     // calculate arc aperture and change the Inversed flag if needed
 499     AttributeBooleanPtr isInversed =
 500         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 501     double aParameterNew = aEndParam - aStartParam;
 502     if (0 <= myParamBefore && myParamBefore <= PI / 2.0 &&
 503         PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0)
 504       isInversed->setValue(true);
 505     else if (PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0 &&
 506              0 <= aParameterNew && aParameterNew <= PI / 2.0)
 507       isInversed->setValue(false);
 508     myParamBefore = aParameterNew;
 509
 510     // do not need to inform that other parameters were changed in this basis mode: these arguments
 511     // change is enough
 512     data()->blockSendAttributeUpdated(false, false);
 513     return;
 514   }
 515
 516   if (theID == PASSED_POINT_ID()) {
 517     data()->blockSendAttributeUpdated(true);
 518
 519     std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
 520     int aNbInitialized = 0;
 521     for (int i = 1; i <= 3; ++i) {
 522       std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
 523           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
 524       if (aCurPnt->isInitialized())
 525         aPoints[aNbInitialized++] = aCurPnt->pnt();
 526     }
 527
 528     if (aNbInitialized == 3) {
 529       std::shared_ptr<GeomAPI_Circ2d> aCircle(
 530           new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
 531
 532       std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
 533       if (aCenter) {
 534         aCenterAttr->setValue(aCenter);
 535       }
 536     }
 537     data()->blockSendAttributeUpdated(false);
 538     return;
 539   }
 540
 541   if (theID == RADIUS_ID()) {
 542     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized() || !aCenterAttr->isInitialized())
 543       return;
 544     // move center and passed point
 545     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 546     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 547     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 548     if (aStart->distance(aCenter) < tolerance || anEnd->distance(aCenter) < tolerance)
 549       return;
 550     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 551         data()->attribute(RADIUS_ID()));
 552     double aRadius = aRadiusAttr->value();
 553
 554     data()->blockSendAttributeUpdated(true);
 555     std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStart->xy()->decreased(aCenter->xy())));
 556     std::shared_ptr<GeomAPI_XY> aNewStart = aStartDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 557     aStartAttr->setValue(aNewStart->x(), aNewStart->y());
 558     std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEnd->xy()->decreased(aCenter->xy())));
 559     std::shared_ptr<GeomAPI_XY> aNewEnd = anEndDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 560     anEndAttr->setValue(aNewEnd->x(), aNewEnd->y());
 561     data()->blockSendAttributeUpdated(false);
 562     return;
 563   }
 564   if (theID == ANGLE_ID()) {
 565     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 566       return;
 567     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 568         data()->attribute(ANGLE_ID()));
 569     data()->blockSendAttributeUpdated(true);
 570     // move end point and passed point
 571     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 572     double anAngle = anAngleAttr->value() * PI / 180.0;
 573     double sinA = sin(anAngle);
 574     double cosA = cos(anAngle);
 575     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 576     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 577         aStartDir->x() * cosA - aStartDir->y() * sinA,
 578         aStartDir->x() * sinA + aStartDir->y() * cosA));
 579     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 580     data()->blockSendAttributeUpdated(false);
 581     return;
 582   }
 583 }
 584
 585 void SketchPlugin_Arc::setReversed(bool isReversed)
 586 {
 587   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 588   myParamBefore = 0.0;
 589 }
 590
 591 bool SketchPlugin_Arc::isReversed()
 592 {
 593   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 594 }
 595
 596 void SketchPlugin_Arc::tangencyArcConstraints()
 597 {
 598   if (!lastResult())
 599     return;
 600
 601   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 602       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 603   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 604       attribute(TANGENT_POINT_ID()));
 605   if (!aTangPtAttr->attr())
 606     return;
 607
 608   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 609   ObjectPtr aThisArc = aFeature->lastResult();
 610   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 611   ObjectPtr aTangFeature = aFeature->lastResult();
 612
 613   // trying to find constraints to fix the tangency of the arc
 614   std::set<FeaturePtr> aCoincidence;
 615   std::set<FeaturePtr> aTangency;
 616
 617   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 618   std::set<AttributePtr> aRefs = data()->refsToMe();
 619   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 620   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 621   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 622   for (; aRefIt != aRefs.end(); ++aRefIt) {
 623     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 624     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 625       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 626           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 627       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 628           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 629       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 630           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 631         aCoincidence.insert(aConstrFeature);
 632     }
 633     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 634       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 635           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 636       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 637           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 638       if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
 639           (aRefAttrB && aRefAttrB->object() == aThisArc))
 640         aTangency.insert(aConstrFeature);
 641     }
 642   }
 643   // search applicable pair of constraints
 644   bool isFound = false;
 645   FeaturePtr aPrevCoincidence, aPrevTangency;
 646   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 647   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 648     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 649         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 650     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 651         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 652     AttributePtr anOtherPoint =
 653         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 654     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 655       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 656           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 657       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 658           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 659       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 660           aRefAttrB->object() : aRefAttrA->object();
 661       FeaturePtr anOtherFeature = ModelAPI_Feature::feature(anOtherObject);
 662       if (anOtherPoint->owner() == anOtherFeature) {
 663         isFound = true;
 664         aPrevCoincidence = *aCIt;
 665         aPrevTangency = *aTIt;
 666       }
 667     }
 668   }
 669
 670   if (isFound) {
 671     // update previous constraints
 672     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 673         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 674     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 675         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 676     if (aRefAttrA->attr() == aStartAttr)
 677       aRefAttrB->setAttr(aTangPtAttr->attr());
 678     else
 679       aRefAttrA->setAttr(aTangPtAttr->attr());
 680
 681     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 682         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 683     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 684         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 685     if (aRefAttrA->object() == aThisArc)
 686       aRefAttrB->setObject(aTangFeature);
 687     else
 688       aRefAttrA->setObject(aTangFeature);
 689   } else {
 690     // Wait all constraints being removed, then send update events
 691     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 692     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 693     if (isDeleteFlushed)
 694       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 695     // Remove all obtained constraints which use current arc, because
 696     // there is no information which of them were used to build tangency arc.
 697     DocumentPtr aDoc = sketch()->document();
 698     std::set<FeaturePtr> aFeaturesToBeRemoved;
 699     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 700       aFeaturesToBeRemoved.insert(*aCIt);
 701     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 702       aFeaturesToBeRemoved.insert(*aTIt);
 703     ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
 704     // Send events to update the sub-features by the solver.
 705     if (isDeleteFlushed)
 706       Events_Loop::loop()->setFlushed(aDeleteEvent, true);
 707     else
 708       Events_Loop::loop()->flush(aDeleteEvent);
 709
 710     // Wait all constraints being created, then send update events
 711     static Events_ID aCreateEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
 712     bool isCreateFlushed = Events_Loop::loop()->isFlushed(aCreateEvent);
 713     if (isCreateFlushed)
 714       Events_Loop::loop()->setFlushed(aCreateEvent, false);
 715
 716     // Create new constraints
 717     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 718     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 719         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 720     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 721         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 722     aRefAttrA->setAttr(aStartAttr);
 723     aRefAttrB->setAttr(aTangPtAttr->attr());
 724     aConstraint->execute();
 725     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 726
 727     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 728     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 729         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 730     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 731         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 732     aRefAttrA->setObject(aThisArc);
 733     aRefAttrB->setObject(aTangFeature);
 734     aConstraint->execute();
 735     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 736
 737     // Send events to update the sub-features by the solver.
 738     if(isCreateFlushed)
 739       Events_Loop::loop()->setFlushed(aCreateEvent, true);
 740     else
 741       Events_Loop::loop()->flush(aCreateEvent);
 742   }
 743 }