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