src/SketchPlugin/SketchPlugin_Fillet.cpp

   1 // Copyright (C) 2014-2017  CEA/DEN, EDF R&D
   2 //
   3 // This library is free software; you can redistribute it and/or
   4 // modify it under the terms of the GNU Lesser General Public
   5 // License as published by the Free Software Foundation; either
   6 // version 2.1 of the License, or (at your option) any later version.
   7 //
   8 // This library is distributed in the hope that it will be useful,
   9 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 // Lesser General Public License for more details.
  12 //
  13 // You should have received a copy of the GNU Lesser General Public
  14 // License along with this library; if not, write to the Free Software
  15 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  16 //
  17 // See http://www.salome-platform.org/ or
  18 // email : webmaster.salome@opencascade.com<mailto:webmaster.salome@opencascade.com>
  19 //
  20
  21 #include "SketchPlugin_Fillet.h"
  22
  23 #include "SketchPlugin_Arc.h"
  24 #include "SketchPlugin_Line.h"
  25 #include "SketchPlugin_Point.h"
  26 #include "SketchPlugin_Sketch.h"
  27 #include "SketchPlugin_ConstraintDistance.h"
  28 #include "SketchPlugin_ConstraintEqual.h"
  29 #include "SketchPlugin_ConstraintCoincidence.h"
  30 #include "SketchPlugin_ConstraintLength.h"
  31 #include "SketchPlugin_ConstraintMiddle.h"
  32 #include "SketchPlugin_ConstraintTangent.h"
  33 #include "SketchPlugin_ConstraintRadius.h"
  34 #include "SketchPlugin_Tools.h"
  35
  36 #include <ModelAPI_AttributeDouble.h>
  37 #include <ModelAPI_AttributeInteger.h>
  38 #include <ModelAPI_AttributeRefAttr.h>
  39 #include <ModelAPI_Data.h>
  40 #include <ModelAPI_Events.h>
  41 #include <ModelAPI_Session.h>
  42 #include <ModelAPI_Tools.h>
  43 #include <ModelAPI_Validator.h>
  44
  45 #include <GeomAlgoAPI_Circ2dBuilder.h>
  46 #include <GeomAlgoAPI_EdgeBuilder.h>
  47
  48 #include <GeomAPI_Circ2d.h>
  49 #include <GeomAPI_Dir2d.h>
  50 #include <GeomAPI_Lin2d.h>
  51 #include <GeomAPI_Pnt2d.h>
  52 #include <GeomAPI_XY.h>
  53
  54 #include <GeomDataAPI_Point2D.h>
  55
  56 #include <Events_Loop.h>
  57
  58 #include <math.h>
  59
  60 const double tolerance = 1.e-7;
  61 const double paramTolerance = 1.e-4;
  62 const double PI = 3.141592653589793238463;
  63
  64 /// \brief Attract specified point on theNewArc to the attribute of theFeature
  65 static void recalculateAttributes(FeaturePtr theNewArc, const std::string& theNewArcAttribute,
  66   FeaturePtr theFeature, const std::string& theFeatureAttribute);
  67
  68
  69 /// \brief Calculate radius of a fillet.
  70 ///        It should not be greater than 1/3 of shortest edge length.
  71 static double calculateFilletRadius(FeaturePtr theFilletFeatures[2]);
  72
  73 /// \brief Calculates center of fillet arc and coordinates of tangency points
  74 static void calculateFilletCenter(FeaturePtr theFilletFeatures[2],
  75                                   double theFilletRadius,
  76                                   const std::shared_ptr<GeomAPI_Ax3>& theSketchPlane,
  77                                   std::shared_ptr<GeomAPI_XY>& theCenter,
  78                                   std::shared_ptr<GeomAPI_XY>& theTangentA,
  79                                   std::shared_ptr<GeomAPI_XY>& theTangentB);
  80
  81 static std::set<FeaturePtr> findFeaturesToRemove(const FeaturePtr theFeature,
  82                                                  const AttributePtr theAttribute);
  83
  84 SketchPlugin_Fillet::SketchPlugin_Fillet()
  85 : myFilletCreated(false)
  86 {
  87 }
  88
  89 void SketchPlugin_Fillet::initAttributes()
  90 {
  91   data()->addAttribute(FILLET_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
  92 }
  93
  94 void SketchPlugin_Fillet::execute()
  95 {
  96   // Wait all constraints being created, then send update events
  97   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
  98   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
  99   if (isUpdateFlushed)
 100     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 101
 102   // set flag here to avoid building Fillet presentation if "Redisplay" event appears
 103   myFilletCreated = true;
 104
 105   // create feature for fillet arc
 106   FeaturePtr aFilletArc = createFilletArc();
 107
 108   // collect features referred to the edges participating in fillet
 109   AttributePoint2DPtr aFilletPoints[2];
 110   int aFeatInd[2];
 111   int anAttrInd[2];
 112   std::set<FeaturePtr> aFeaturesToBeRemoved;
 113   for (int i = 0; i < 2; ++i) {
 114     bool isFirstIndex = (i == 0);
 115     aFeatInd[i] = myIsReversed == isFirstIndex ? 1 : 0;
 116     anAttrInd[i] = (myIsReversed == isFirstIndex ? 2 : 0) + (myIsNotInversed[aFeatInd[i]] ? 0 : 1);
 117     aFilletPoints[i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 118         myBaseFeatures[aFeatInd[i]]->attribute(myFeatAttributes[anAttrInd[i]]));
 119     std::set<FeaturePtr> aRemove =
 120         findFeaturesToRemove(myBaseFeatures[aFeatInd[i]], aFilletPoints[i]);
 121     aFeaturesToBeRemoved.insert(aRemove.begin(), aRemove.end());
 122   }
 123
 124   // keep "distance" constraints and remove all other references
 125   removeReferencesButKeepDistances(aFeaturesToBeRemoved, aFilletPoints);
 126
 127   // Update fillet edges.
 128   recalculateAttributes(aFilletArc, SketchPlugin_Arc::START_ID(),
 129                         myBaseFeatures[aFeatInd[0]], myFeatAttributes[anAttrInd[0]]);
 130   recalculateAttributes(aFilletArc, SketchPlugin_Arc::END_ID(),
 131                         myBaseFeatures[aFeatInd[1]], myFeatAttributes[anAttrInd[1]]);
 132
 133   FeaturePtr aConstraint;
 134
 135   // Create coincidence features.
 136   aConstraint = SketchPlugin_Tools::createConstraintAttrAttr(sketch(),
 137                     SketchPlugin_ConstraintCoincidence::ID(),
 138                     aFilletArc->attribute(SketchPlugin_Arc::START_ID()),
 139                     myBaseFeatures[aFeatInd[0]]->attribute(myFeatAttributes[anAttrInd[0]]));
 140   ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 141   aConstraint = SketchPlugin_Tools::createConstraintAttrAttr(sketch(),
 142                     SketchPlugin_ConstraintCoincidence::ID(),
 143                     aFilletArc->attribute(SketchPlugin_Arc::END_ID()),
 144                     myBaseFeatures[aFeatInd[1]]->attribute(myFeatAttributes[anAttrInd[1]]));
 145   ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 146
 147   // Create tangent features.
 148   for (int i = 0; i < 2; i++) {
 149     aConstraint = SketchPlugin_Tools::createConstraintObjectObject(sketch(),
 150                       SketchPlugin_ConstraintTangent::ID(),
 151                       aFilletArc->lastResult(),
 152                       myBaseFeatures[i]->lastResult());
 153     aConstraint->execute();
 154     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 155   }
 156
 157   // Send events to update the sub-features by the solver.
 158   if (isUpdateFlushed)
 159     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 160 }
 161
 162 AISObjectPtr SketchPlugin_Fillet::getAISObject(AISObjectPtr thePrevious)
 163 {
 164   if(myFilletCreated) {
 165     return AISObjectPtr();
 166   }
 167
 168   SketchPlugin_Sketch* aSketch = sketch();
 169   if(!aSketch) {
 170     return AISObjectPtr();
 171   }
 172
 173   if (!calculateFilletParameters())
 174     return AISObjectPtr();
 175
 176   // Create arc for presentation.
 177   std::shared_ptr<GeomAPI_Pnt> aCenterPnt(aSketch->to3D(myCenterXY->x(), myCenterXY->y()));
 178   std::shared_ptr<GeomAPI_Pnt> aTangentPnt1(aSketch->to3D(myTangentXY1->x(),
 179                                                           myTangentXY1->y()));
 180   std::shared_ptr<GeomAPI_Pnt> aTangentPnt2(aSketch->to3D(myTangentXY2->x(),
 181                                                           myTangentXY2->y()));
 182   std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 183     aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 184   std::shared_ptr<GeomAPI_Shape> anArcShape =
 185       GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenterPnt, aTangentPnt1, aTangentPnt2, aNDir->dir());
 186
 187   AISObjectPtr anAISObject = thePrevious;
 188   if(!anAISObject.get()) {
 189     anAISObject = AISObjectPtr(new GeomAPI_AISObject);
 190   }
 191   anAISObject->createShape(anArcShape);
 192   return anAISObject;
 193 }
 194
 195 bool SketchPlugin_Fillet::calculateFilletParameters()
 196 {
 197   // Get fillet point.
 198   AttributeRefAttrPtr aPointRefAttr = refattr(FILLET_POINT_ID());
 199   if (!aPointRefAttr->isInitialized() || aPointRefAttr->isObject())
 200     return false;
 201   std::shared_ptr<GeomDataAPI_Point2D> aFilletPoint2D =
 202     std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aPointRefAttr->attr());
 203   if (!aFilletPoint2D.get())
 204     return false;
 205
 206   std::set<AttributePoint2DPtr> aCoincidentPoints =
 207       SketchPlugin_Tools::findPointsCoincidentToPoint(aFilletPoint2D);
 208   std::set<FeaturePtr> aFilletFeatures;
 209   for (std::set<AttributePoint2DPtr>::iterator aCPIt = aCoincidentPoints.begin();
 210        aCPIt != aCoincidentPoints.end(); ++aCPIt) {
 211     std::shared_ptr<SketchPlugin_Feature> anOwner =
 212         std::dynamic_pointer_cast<SketchPlugin_Feature>(
 213         ModelAPI_Feature::feature((*aCPIt)->owner()));
 214     if (anOwner && !anOwner->isExternal())
 215       aFilletFeatures.insert(anOwner);
 216   }
 217   if (aFilletFeatures.size() != 2) {
 218     setError("Error: Selected point does not have two suitable edges for fillet.");
 219     return false;
 220   }
 221
 222   std::set<FeaturePtr>::iterator aFIt = aFilletFeatures.begin();
 223   myBaseFeatures[0] = *aFIt;
 224   myBaseFeatures[1] = *(++aFIt);
 225
 226   std::shared_ptr<GeomAPI_Pnt2d> aFilletPnt2d = aFilletPoint2D->pnt();
 227   double aRadius = calculateFilletRadius(myBaseFeatures);
 228
 229   // Calculate arc attributes.
 230   static const int aNbFeatures = 2;
 231   // First pair of points relate to first feature, second pair -  to second.
 232   std::shared_ptr<GeomAPI_Pnt2d> aStartEndPnt[aNbFeatures * 2];
 233   for (int i = 0; i < aNbFeatures; i++) {
 234     std::string aStartAttr, aEndAttr;
 235     if (myBaseFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
 236       aStartAttr = SketchPlugin_Line::START_ID();
 237       aEndAttr = SketchPlugin_Line::END_ID();
 238     } else if (myBaseFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
 239       aStartAttr = SketchPlugin_Arc::START_ID();
 240       aEndAttr = SketchPlugin_Arc::END_ID();
 241     } else { // Wrong argument.
 242       setError("Error: One of the points has wrong coincide feature");
 243       return false;
 244     }
 245     myFeatAttributes[2*i] = aStartAttr;
 246     aStartEndPnt[2*i] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 247       myBaseFeatures[i]->attribute(aStartAttr))->pnt();
 248     myFeatAttributes[2*i+1] = aEndAttr;
 249     aStartEndPnt[2*i+1] = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 250       myBaseFeatures[i]->attribute(aEndAttr))->pnt();
 251   }
 252   for (int aFeatInd = 0; aFeatInd < aNbFeatures; aFeatInd++) {
 253     for (int j = 0; j < 2; j++) // loop on start-end of each feature
 254       if (aStartEndPnt[aFeatInd * aNbFeatures + j]->distance(aFilletPnt2d) < 1.e-10) {
 255         myIsNotInversed[aFeatInd] = (j==0);
 256         break;
 257       }
 258   }
 259
 260   std::shared_ptr<GeomAPI_Ax3> aSketchPlane = SketchPlugin_Sketch::plane(sketch());
 261   calculateFilletCenter(myBaseFeatures, aRadius, aSketchPlane,
 262                         myCenterXY, myTangentXY1, myTangentXY2);
 263
 264   // Tangent directions of the features in coincident point.
 265   std::shared_ptr<GeomAPI_Dir2d> aTangentDir[aNbFeatures];
 266   for (int i = 0; i < aNbFeatures; i++) {
 267     std::shared_ptr<GeomAPI_XY> aDir;
 268     if (myBaseFeatures[i]->getKind() == SketchPlugin_Line::ID()) {
 269       aDir = aStartEndPnt[2*i+1]->xy()->decreased(aStartEndPnt[2*i]->xy());
 270       if (!myIsNotInversed[i])
 271         aDir = aDir->multiplied(-1.0);
 272     } else if (myBaseFeatures[i]->getKind() == SketchPlugin_Arc::ID()) {
 273       std::shared_ptr<GeomAPI_Pnt2d> aCenterPoint =
 274         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 275         myBaseFeatures[i]->attribute(SketchPlugin_Arc::CENTER_ID()))->pnt();
 276       aDir = myIsNotInversed[i] ? aStartEndPnt[2*i]->xy() : aStartEndPnt[2*i+1]->xy();
 277       aDir = aDir->decreased(aCenterPoint->xy());
 278
 279       double x = aDir->x();
 280       double y = aDir->y();
 281       aDir->setX(-y);
 282       aDir->setY(x);
 283       if (myIsNotInversed[i] ==
 284           std::dynamic_pointer_cast<SketchPlugin_Arc>(myBaseFeatures[i])->isReversed())
 285         aDir = aDir->multiplied(-1.0);
 286     }
 287     aTangentDir[i] = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(aDir));
 288   }
 289
 290   // By default, the start point of fillet arc is connected to FeatureA,
 291   // and the end point - to FeatureB. But when the angle between TangentDirA and
 292   // TangentDirB greater 180 degree, the sequaence of features need to be reversed.
 293   double cosBA = aTangentDir[0]->cross(aTangentDir[1]); // cos(B-A),
 294   // where A and B - angles between corresponding tanget direction and the X axis
 295   myIsReversed = cosBA > 0.0;
 296
 297   if(myIsReversed) {
 298     std::shared_ptr<GeomAPI_XY> aTmp = myTangentXY1;
 299     myTangentXY1 = myTangentXY2;
 300     myTangentXY2 = aTmp;
 301   }
 302   return true;
 303 }
 304
 305 FeaturePtr SketchPlugin_Fillet::createFilletArc()
 306 {
 307   // Calculate Fillet parameters if does not yet
 308   if (!myBaseFeatures[0] || !myBaseFeatures[1])
 309     calculateFilletParameters();
 310
 311   // Create arc feature.
 312   FeaturePtr aFilletArc = sketch()->addFeature(SketchPlugin_Arc::ID());
 313
 314   // Set arc attributes.
 315   bool aWasBlocked = aFilletArc->data()->blockSendAttributeUpdated(true);
 316   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 317       aFilletArc->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(myCenterXY->x(),
 318                                                                       myCenterXY->y());
 319   std::shared_ptr<GeomDataAPI_Point2D> aStartPoint =
 320       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 321           aFilletArc->attribute(SketchPlugin_Arc::START_ID()));
 322   std::shared_ptr<GeomDataAPI_Point2D> aEndPoint =
 323       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 324           aFilletArc->attribute(SketchPlugin_Arc::END_ID()));
 325   if(aStartPoint->isInitialized() && aEndPoint->isInitialized()
 326       && (aStartPoint->pnt()->xy()->distance(myTangentXY1) > tolerance
 327       || aEndPoint->pnt()->xy()->distance(myTangentXY2) > tolerance)) {
 328     std::dynamic_pointer_cast<SketchPlugin_Arc>(aFilletArc)->setReversed(false);
 329   }
 330   aStartPoint->setValue(myTangentXY1->x(), myTangentXY1->y());
 331   aEndPoint->setValue(myTangentXY2->x(), myTangentXY2->y());
 332   aFilletArc->data()->blockSendAttributeUpdated(aWasBlocked);
 333   aFilletArc->execute();
 334
 335   return aFilletArc;
 336 }
 337
 338 FeaturePtr SketchPlugin_Fillet::createFilletApex(const GeomPnt2dPtr& theCoordinates)
 339 {
 340   FeaturePtr anApex = sketch()->addFeature(SketchPlugin_Point::ID());
 341   AttributePoint2DPtr aCoord = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 342       anApex->attribute(SketchPlugin_Point::COORD_ID()));
 343   aCoord->setValue(theCoordinates);
 344   anApex->boolean(SketchPlugin_Point::AUXILIARY_ID())->setValue(true);
 345
 346   // additional coincidence constraints
 347   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 348   FeaturePtr aConstraint;
 349   for (int i = 0; i < 2; i++) {
 350     aConstraint = SketchPlugin_Tools::createConstraintAttrObject(sketch(),
 351                       SketchPlugin_ConstraintCoincidence::ID(),
 352                       aCoord,
 353                       myBaseFeatures[i]->lastResult());
 354     aConstraint->execute();
 355     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, anUpdateEvent);
 356   }
 357
 358   return anApex;
 359 }
 360
 361 struct Length {
 362   AttributePtr myPoints[2];
 363   std::string myValueText;
 364   double myValueDouble;
 365   GeomPnt2dPtr myFlyoutPoint;
 366   int myLocationType;
 367 };
 368
 369 void SketchPlugin_Fillet::removeReferencesButKeepDistances(
 370     std::set<FeaturePtr>& theFeaturesToRemove,
 371     const AttributePoint2DPtr theFilletPoints[2])
 372 {
 373   FeaturePtr aFilletApex;
 374   std::list<Length> aLengthToDistance;
 375
 376   std::set<FeaturePtr>::iterator aFeat = theFeaturesToRemove.begin();
 377   while (aFeat != theFeaturesToRemove.end()) {
 378     std::shared_ptr<SketchPlugin_ConstraintDistance> aDistance =
 379         std::dynamic_pointer_cast<SketchPlugin_ConstraintDistance>(*aFeat);
 380     if (aDistance) {
 381       if (!aFilletApex)
 382         aFilletApex = createFilletApex(theFilletPoints[0]->pnt());
 383       // update attributes of distance constraints
 384       bool isUpdated = false;
 385       for (int attrInd = 0; attrInd < CONSTRAINT_ATTR_SIZE && !isUpdated; ++attrInd) {
 386         AttributeRefAttrPtr aRefAttr =
 387             aDistance->refattr(SketchPlugin_Constraint::ATTRIBUTE(attrInd));
 388         if (aRefAttr && !aRefAttr->isObject() &&
 389            (aRefAttr->attr() == theFilletPoints[0] || aRefAttr->attr() == theFilletPoints[1])) {
 390           aRefAttr->setAttr(aFilletApex->attribute(SketchPlugin_Point::COORD_ID()));
 391           isUpdated = true;
 392         }
 393       }
 394       // avoid distance from removing if it is updated
 395       std::set<FeaturePtr>::iterator aKeepIt = aFeat++;
 396       if (isUpdated)
 397         theFeaturesToRemove.erase(aKeepIt);
 398
 399     } else {
 400       std::shared_ptr<SketchPlugin_ConstraintLength> aLength =
 401           std::dynamic_pointer_cast<SketchPlugin_ConstraintLength>(*aFeat);
 402       if (aLength) {
 403         if (!aFilletApex)
 404           aFilletApex = createFilletApex(theFilletPoints[0]->pnt());
 405         // remove Length, but create new distance constraint
 406         AttributeRefAttrPtr aRefAttr =
 407           aLength->refattr(SketchPlugin_Constraint::ENTITY_A());
 408         FeaturePtr aLine = ModelAPI_Feature::feature(aRefAttr->object());
 409         if (aLine) {
 410           aLengthToDistance.push_back(Length());
 411           Length& aNewLength = aLengthToDistance.back();
 412           // main attrbutes
 413           for (int i = 0; i < 2; ++i) {
 414             AttributePtr anAttr = aLine->attribute(
 415                 i == 0 ? SketchPlugin_Line::START_ID() : SketchPlugin_Line::END_ID());
 416             if (anAttr == theFilletPoints[0] || anAttr == theFilletPoints[1])
 417               aNewLength.myPoints[i] = aFilletApex->attribute(SketchPlugin_Point::COORD_ID());
 418             else
 419               aNewLength.myPoints[i] = anAttr;
 420           }
 421           // value
 422           AttributeDoublePtr aValue = aLength->real(SketchPlugin_Constraint::VALUE());
 423           aNewLength.myValueDouble = aValue->value();
 424           aNewLength.myValueText = aValue->text();
 425           // auxiliary attributes
 426           AttributePoint2DPtr aFlyoutAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 427               aLength->attribute(SketchPlugin_ConstraintLength::FLYOUT_VALUE_PNT()));
 428           if (aFlyoutAttr && aFlyoutAttr->isInitialized())
 429             aNewLength.myFlyoutPoint = SketchPlugin_Tools::flyoutPointCoordinates(aLength);
 430           AttributeIntegerPtr aLocationAttr =
 431               aLength->integer(SketchPlugin_ConstraintLength::LOCATION_TYPE_ID());
 432           if (aLocationAttr && aLocationAttr->isInitialized())
 433             aNewLength.myLocationType = aLocationAttr->value();
 434           else
 435             aNewLength.myLocationType = -1;
 436         }
 437       }
 438
 439       ++aFeat;
 440     }
 441   }
 442
 443   // remove references
 444   ModelAPI_Tools::removeFeaturesAndReferences(theFeaturesToRemove);
 445   Events_Loop::loop()->flush(Events_Loop::eventByName(EVENT_OBJECT_DELETED));
 446
 447   // restore Length constraints as point-point distances
 448   FeaturePtr aConstraint;
 449   std::list<Length>::iterator anIt = aLengthToDistance.begin();
 450   for (; anIt != aLengthToDistance.end(); ++anIt) {
 451     aConstraint = SketchPlugin_Tools::createConstraintAttrAttr(sketch(),
 452         SketchPlugin_ConstraintDistance::ID(), anIt->myPoints[0], anIt->myPoints[1]);
 453     // set value
 454     AttributeDoublePtr aValue = aConstraint->real(SketchPlugin_Constraint::VALUE());
 455     if (anIt->myValueText.empty())
 456       aValue->setValue(anIt->myValueDouble);
 457     else
 458       aValue->setText(anIt->myValueText);
 459     // set flyout point if exists
 460     if (anIt->myFlyoutPoint) {
 461       AttributePoint2DPtr aFlyoutAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 462           aConstraint->attribute(SketchPlugin_ConstraintDistance::FLYOUT_VALUE_PNT()));
 463       aFlyoutAttr->setValue(anIt->myFlyoutPoint);
 464     }
 465     // set location type if initialized
 466     if (anIt->myLocationType >= 0) {
 467       AttributeIntegerPtr aLocationType =
 468           aConstraint->integer(SketchPlugin_ConstraintDistance::LOCATION_TYPE_ID());
 469       aLocationType->setValue(anIt->myLocationType);
 470     }
 471     aConstraint->execute();
 472     ModelAPI_EventCreator::get()->sendUpdated(aConstraint,
 473         Events_Loop::eventByName(EVENT_OBJECT_UPDATED));
 474   }
 475 }
 476
 477 // =========   Auxiliary functions   =================
 478 void recalculateAttributes(FeaturePtr theNewArc,  const std::string& theNewArcAttribute,
 479                            FeaturePtr theFeature, const std::string& theFeatureAttribute)
 480 {
 481   std::shared_ptr<GeomAPI_Pnt2d> anArcPoint = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 482       theNewArc->attribute(theNewArcAttribute))->pnt();
 483   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 484       theFeature->attribute(theFeatureAttribute))->setValue(anArcPoint->x(), anArcPoint->y());
 485 }
 486
 487 static std::shared_ptr<GeomAPI_Pnt2d> toPoint(const AttributePtr& theAttribute)
 488 {
 489   std::shared_ptr<GeomAPI_Pnt2d> aPoint;
 490   AttributePoint2DPtr aPointAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(theAttribute);
 491   if (aPointAttr)
 492     aPoint = aPointAttr->pnt();
 493   return aPoint;
 494 }
 495
 496 static std::shared_ptr<GeomAPI_Lin2d> toLine(const FeaturePtr& theFeature)
 497 {
 498   std::shared_ptr<GeomAPI_Lin2d> aLine;
 499   if (theFeature->getKind() == SketchPlugin_Line::ID()) {
 500     std::shared_ptr<GeomAPI_Pnt2d> aStart =
 501         toPoint( theFeature->attribute(SketchPlugin_Line::START_ID()) );
 502     std::shared_ptr<GeomAPI_Pnt2d> aEnd =
 503         toPoint( theFeature->attribute(SketchPlugin_Line::END_ID()) );
 504     aLine = std::shared_ptr<GeomAPI_Lin2d>(new GeomAPI_Lin2d(aStart, aEnd));
 505   }
 506   return aLine;
 507 }
 508
 509 static std::shared_ptr<GeomAPI_Circ2d> toCircle(const FeaturePtr& theFeature)
 510 {
 511   std::shared_ptr<GeomAPI_Circ2d> aCircle;
 512   if (theFeature->getKind() == SketchPlugin_Arc::ID()) {
 513     std::shared_ptr<GeomAPI_Pnt2d> aCenter =
 514         toPoint( theFeature->attribute(SketchPlugin_Arc::CENTER_ID()) );
 515     std::shared_ptr<GeomAPI_Pnt2d> aStart =
 516         toPoint( theFeature->attribute(SketchPlugin_Arc::START_ID()) );
 517     aCircle = std::shared_ptr<GeomAPI_Circ2d>(new GeomAPI_Circ2d(aCenter, aStart));
 518   }
 519   return aCircle;
 520 }
 521
 522
 523 void calculateFilletCenter(FeaturePtr theFilletFeatures[2],
 524                            double theFilletRadius,
 525                            const std::shared_ptr<GeomAPI_Ax3>& theSketchPlane,
 526                            std::shared_ptr<GeomAPI_XY>& theCenter,
 527                            std::shared_ptr<GeomAPI_XY>& theTangentA,
 528                            std::shared_ptr<GeomAPI_XY>& theTangentB)
 529 {
 530   GeomShapePtr aShapeA = theFilletFeatures[0]->lastResult()->shape();
 531   GeomShapePtr aShapeB = theFilletFeatures[1]->lastResult()->shape();
 532
 533   GeomAlgoAPI_Circ2dBuilder aCircBuilder(theSketchPlane);
 534   aCircBuilder.addTangentCurve(aShapeA);
 535   aCircBuilder.addTangentCurve(aShapeB);
 536   aCircBuilder.setRadius(theFilletRadius);
 537
 538   std::shared_ptr<GeomAPI_Circ2d> aFilletCircle = aCircBuilder.circle();
 539   if (!aFilletCircle)
 540     return;
 541
 542   theCenter = aFilletCircle->center()->xy();
 543   // tangent points
 544   std::shared_ptr<GeomAPI_Pnt2d> aTgPoints[2];
 545   for (int i = 0; i < 2; ++i) {
 546     std::shared_ptr<GeomAPI_Circ2d> aCircle = toCircle(theFilletFeatures[i]);
 547     if (aCircle)
 548       aTgPoints[i] = aCircle->project(aFilletCircle->center());
 549     else {
 550       std::shared_ptr<GeomAPI_Lin2d> aLine = toLine(theFilletFeatures[i]);
 551       if (aLine)
 552         aTgPoints[i] = aLine->project(aFilletCircle->center());
 553     }
 554   }
 555   theTangentA = aTgPoints[0]->xy();
 556   theTangentB = aTgPoints[1]->xy();
 557 }
 558
 559 double calculateFilletRadius(FeaturePtr theFilletFeatures[2])
 560 {
 561   double aLengths[2] = { 0, 0 };
 562   for (int i = 0; i < 2; ++i) {
 563     GeomShapePtr aShape = theFilletFeatures[i]->lastResult()->shape();
 564     std::shared_ptr<GeomAPI_Edge> anEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(aShape);
 565     if (anEdge)
 566       aLengths[i] = anEdge->length();
 567   }
 568   return (aLengths[0] < aLengths[1] ? aLengths[0] : aLengths[1]) / 6.0;
 569 }
 570
 571 std::set<FeaturePtr> findFeaturesToRemove(const FeaturePtr theFeature,
 572                                           const AttributePtr theAttribute) {
 573   std::set<FeaturePtr> aFeaturesToBeRemoved;
 574   std::set<AttributePtr> aRefs = theFeature->data()->refsToMe();
 575   std::list<ResultPtr> aResults = theFeature->results();
 576   for(std::list<ResultPtr>::const_iterator aResultsIt = aResults.cbegin();
 577       aResultsIt != aResults.cend();
 578       ++aResultsIt) {
 579     ResultPtr aResult = *aResultsIt;
 580     std::set<AttributePtr> aResultRefs = aResult->data()->refsToMe();
 581     aRefs.insert(aResultRefs.begin(), aResultRefs.end());
 582   }
 583   for(std::set<AttributePtr>::const_iterator anIt = aRefs.cbegin();
 584     anIt != aRefs.cend();
 585     ++anIt) {
 586     std::shared_ptr<ModelAPI_Attribute> anAttr = (*anIt);
 587     FeaturePtr aFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(anAttr->owner());
 588     if(aFeature->getKind() == SketchPlugin_Fillet::ID()) {
 589       continue;
 590     }
 591     if(aFeature->getKind() == SketchPlugin_ConstraintLength::ID()
 592         || aFeature->getKind() == SketchPlugin_ConstraintEqual::ID()
 593         || aFeature->getKind() == SketchPlugin_ConstraintMiddle::ID()) {
 594       aFeaturesToBeRemoved.insert(aFeature);
 595     } else {
 596       std::list<AttributePtr> anAttrs =
 597           aFeature->data()->attributes(ModelAPI_AttributeRefAttr::typeId());
 598       for(std::list<AttributePtr>::const_iterator aRefAttrsIt = anAttrs.cbegin();
 599           aRefAttrsIt != anAttrs.cend();
 600           ++aRefAttrsIt) {
 601         AttributeRefAttrPtr anAttrRefAttr =
 602           std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(*aRefAttrsIt);
 603         if(anAttrRefAttr.get() && anAttrRefAttr->attr() == theAttribute) {
 604           aFeaturesToBeRemoved.insert(aFeature);
 605         }
 606       }
 607     }
 608   }
 609   return aFeaturesToBeRemoved;
 610 }