src/SketchPlugin/SketchPlugin_Offset.cpp

   1 // Copyright (C) 2020  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 email : webmaster.salome@opencascade.com
  18 //
  19
  20 #include <SketchPlugin_Offset.h>
  21
  22 #include <SketchPlugin_Sketch.h>
  23 #include <SketchPlugin_Line.h>
  24 #include <SketchPlugin_Point.h>
  25 #include <SketchPlugin_Arc.h>
  26 #include <SketchPlugin_Circle.h>
  27 #include <SketchPlugin_Ellipse.h>
  28 #include <SketchPlugin_EllipticArc.h>
  29 #include <SketchPlugin_BSpline.h>
  30 #include <SketchPlugin_BSplinePeriodic.h>
  31 #include <SketchPlugin_Tools.h>
  32
  33 #include <SketcherPrs_Factory.h>
  34
  35 #include <Events_InfoMessage.h>
  36
  37 #include <ModelAPI_AttributeBoolean.h>
  38 #include <ModelAPI_AttributeDouble.h>
  39 #include <ModelAPI_AttributeDoubleArray.h>
  40 #include <ModelAPI_AttributeInteger.h>
  41 #include <ModelAPI_AttributeIntArray.h>
  42 #include <ModelAPI_AttributeRefList.h>
  43 #include <ModelAPI_Events.h>
  44 #include <ModelAPI_ResultConstruction.h>
  45 #include <ModelAPI_Tools.h>
  46 #include <ModelAPI_Validator.h>
  47
  48 #include <GeomAlgoAPI_MakeShapeList.h>
  49 #include <GeomAlgoAPI_Offset.h>
  50 #include <GeomAlgoAPI_ShapeTools.h>
  51 #include <GeomAlgoAPI_WireBuilder.h>
  52
  53 #include <GeomAPI_BSpline.h>
  54 #include <GeomAPI_Circ.h>
  55 #include <GeomAPI_Edge.h>
  56 #include <GeomAPI_Ellipse.h>
  57 #include <GeomAPI_ShapeExplorer.h>
  58 #include <GeomAPI_Wire.h>
  59 #include <GeomAPI_WireExplorer.h>
  60
  61 #include <GeomDataAPI_Point2D.h>
  62 #include <GeomDataAPI_Point2DArray.h>
  63
  64 static const double tolerance = 1.e-7;
  65
  66 SketchPlugin_Offset::SketchPlugin_Offset()
  67 {
  68 }
  69
  70 void SketchPlugin_Offset::initAttributes()
  71 {
  72   data()->addAttribute(EDGES_ID(), ModelAPI_AttributeRefList::typeId());
  73   data()->addAttribute(VALUE_ID(), ModelAPI_AttributeDouble::typeId());
  74   data()->addAttribute(REVERSED_ID(), ModelAPI_AttributeBoolean::typeId());
  75
  76   // store original entities
  77   data()->addAttribute(SketchPlugin_Constraint::ENTITY_A(), ModelAPI_AttributeRefList::typeId());
  78   // store offset entities
  79   data()->addAttribute(SketchPlugin_Constraint::ENTITY_B(), ModelAPI_AttributeRefList::typeId());
  80   // store mapping between original entity and index of the corresponding offset entity
  81   data()->addAttribute(SketchPlugin_Constraint::ENTITY_C(), ModelAPI_AttributeIntArray::typeId());
  82
  83   ModelAPI_Session::get()->validators()->
  84       registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_A());
  85   ModelAPI_Session::get()->validators()->
  86       registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_B());
  87   ModelAPI_Session::get()->validators()->
  88       registerNotObligatory(getKind(), SketchPlugin_Constraint::ENTITY_C());
  89 }
  90
  91 void SketchPlugin_Offset::execute()
  92 {
  93   SketchPlugin_Sketch* aSketch = sketch();
  94   if (!aSketch) return;
  95
  96   // 1. Sketch plane
  97   std::shared_ptr<GeomAPI_Pln> aPlane = aSketch->plane();
  98
  99   // 2. Offset value
 100   AttributeDoublePtr aValueAttr = real(VALUE_ID());
 101   if (!aValueAttr->isInitialized()) return;
 102   double aValue = aValueAttr->value();
 103   if (aValue < tolerance) return;
 104
 105   // 2.a. Reversed?
 106   AttributeBooleanPtr aReversedAttr = boolean(REVERSED_ID());
 107   if (!aReversedAttr->isInitialized()) return;
 108   if (aReversedAttr->value()) aValue = -aValue; // reverse offset direction
 109
 110   // 3. List of all selected edges
 111   AttributeRefListPtr aSelectedEdges = reflist(EDGES_ID());
 112   std::list<ObjectPtr> anEdgesList = aSelectedEdges->list();
 113
 114   // 4. Put all selected edges in a set to pass them into findWireOneWay() below
 115   std::set<FeaturePtr> anEdgesSet;
 116   std::list<ObjectPtr>::const_iterator anEdgesIt = anEdgesList.begin();
 117   for (; anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 118     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 119     if (aFeature) {
 120       anEdgesSet.insert(aFeature);
 121     }
 122   }
 123
 124   // Wait all objects being created, then send update events
 125   static Events_ID anUpdateEvent = Events_Loop::eventByName(EVENT_OBJECT_UPDATED);
 126   bool isUpdateFlushed = Events_Loop::loop()->isFlushed(anUpdateEvent);
 127   if (isUpdateFlushed)
 128     Events_Loop::loop()->setFlushed(anUpdateEvent, false);
 129
 130   // Save the current feature of the document, because new features may appear while executing.
 131   // In this case, they will become current. But if the number of copies is updated from outside
 132   // of sketch (e.g. by parameter change), the history line should not hold in sketch.
 133   keepCurrentFeature();
 134
 135   // 5. Gather wires and make offset for each wire
 136   ListOfMakeShape anOffsetAlgos;
 137   std::set<FeaturePtr> aProcessedEdgesSet;
 138   for (anEdgesIt = anEdgesList.begin(); anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 139     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 140     if (aFeature.get()) {
 141       if (aProcessedEdgesSet.find(aFeature) != aProcessedEdgesSet.end())
 142         continue;
 143
 144       // 5.a. End points (if any)
 145       std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
 146       SketchPlugin_SegmentationTools::getFeaturePoints(aFeature, aStartPoint, anEndPoint);
 147
 148       // 5.b. Find a chain of edges
 149       std::list<FeaturePtr> aChain;
 150       aChain.push_back(aFeature);
 151       bool isClosed = !(aStartPoint && anEndPoint);  // not closed edge
 152       if (!isClosed) {
 153         isClosed = findWireOneWay(aFeature, aFeature, aStartPoint, anEdgesSet,
 154                                   aProcessedEdgesSet, aChain, true);
 155         if (!isClosed) {
 156           isClosed = findWireOneWay(aFeature, aFeature, anEndPoint, anEdgesSet,
 157                                     aProcessedEdgesSet, aChain, false);
 158         }
 159       }
 160       aProcessedEdgesSet.insert(aFeature);
 161
 162       // 5.c. Make wire
 163       ListOfShape aTopoChain;
 164       std::list<FeaturePtr>::iterator aChainIt = aChain.begin();
 165       for (; aChainIt != aChain.end(); ++aChainIt) {
 166         FeaturePtr aChainFeature = (*aChainIt);
 167         GeomShapePtr aTopoEdge = aChainFeature->lastResult()->shape();
 168         if (aTopoEdge->shapeType() == GeomAPI_Shape::EDGE) {
 169           aTopoChain.push_back(aTopoEdge);
 170         }
 171       }
 172       std::shared_ptr<GeomAlgoAPI_WireBuilder> aWireBuilder(
 173           new GeomAlgoAPI_WireBuilder(aTopoChain, !isClosed));
 174
 175       GeomShapePtr aWireShape = aWireBuilder->shape();
 176       GeomWirePtr aWire (new GeomAPI_Wire (aWireShape));
 177
 178       // Fix for a problem of offset side change with selection change.
 179       // Wire direction is defined by the first selected edge of this wire.
 180       double aSign = 1.;
 181       if (!aWire->isClosed()) {
 182         ListOfShape aModified;
 183         // First selected edge of current chain
 184         GeomShapePtr aFirstSel = aFeature->lastResult()->shape();
 185         aWireBuilder->modified(aFirstSel, aModified);
 186         GeomShapePtr aModFS = aModified.front();
 187         if (aModFS->orientation() != aFirstSel->orientation())
 188           aSign = -1.;
 189       }
 190
 191       // 5.d. Make offset for the wire
 192       std::shared_ptr<GeomAlgoAPI_Offset> anOffsetShape(
 193           new GeomAlgoAPI_Offset(aPlane, aWireShape, aValue*aSign));
 194
 195       std::shared_ptr<GeomAlgoAPI_MakeShapeList> aMakeList(new GeomAlgoAPI_MakeShapeList);
 196       aMakeList->appendAlgo(aWireBuilder);
 197       aMakeList->appendAlgo(anOffsetShape);
 198       anOffsetAlgos.push_back(aMakeList);
 199     }
 200   }
 201
 202   // 6. Store offset results.
 203   //    Create sketch feature for each edge of anOffsetShape, and also store
 204   //    created features in CREATED_ID() to remove them on next execute()
 205   addToSketch(anOffsetAlgos);
 206
 207   restoreCurrentFeature();
 208
 209   // send events to update the sub-features by the solver
 210   if (isUpdateFlushed)
 211     Events_Loop::loop()->setFlushed(anUpdateEvent, true);
 212 }
 213
 214 bool SketchPlugin_Offset::findWireOneWay (const FeaturePtr& theFirstEdge,
 215                                           const FeaturePtr& theEdge,
 216                                           const std::shared_ptr<GeomDataAPI_Point2D>& theEndPoint,
 217                                           std::set<FeaturePtr>& theEdgesSet,
 218                                           std::set<FeaturePtr>& theProcessedEdgesSet,
 219                                           std::list<FeaturePtr>& theChain,
 220                                           const bool isPrepend)
 221 {
 222   // 1. Find a single edge, coincident to theEndPoint by one of its ends
 223   if (!theEndPoint) return false;
 224
 225   FeaturePtr aNextEdgeFeature;
 226   int nbFound = 0;
 227
 228   std::set<AttributePoint2DPtr> aCoincPoints =
 229       SketchPlugin_Tools::findPointsCoincidentToPoint(theEndPoint);
 230
 231   std::set<AttributePoint2DPtr>::iterator aPointsIt = aCoincPoints.begin();
 232   for (; aPointsIt != aCoincPoints.end(); aPointsIt++) {
 233     AttributePoint2DPtr aP = (*aPointsIt);
 234     FeaturePtr aCoincFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aP->owner());
 235     bool isInSet = (theEdgesSet.find(aCoincFeature) != theEdgesSet.end());
 236
 237     // Condition 0: not auxiliary
 238     if (!isInSet && aCoincFeature->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value())
 239       continue;
 240
 241     // Condition 1: not a point feature
 242     if (aCoincFeature->getKind() != SketchPlugin_Point::ID()) {
 243       // Condition 2: it is not the current edge
 244       if (aCoincFeature != theEdge) {
 245         // Condition 3: it is in the set of interest.
 246         //              Empty set means all sketch edges.
 247         if (isInSet || theEdgesSet.empty()) {
 248           // Condition 4: consider only features with two end points
 249           std::shared_ptr<GeomDataAPI_Point2D> aP1, aP2;
 250           SketchPlugin_SegmentationTools::getFeaturePoints(aCoincFeature, aP1, aP2);
 251           if (aP1 && aP2) {
 252             // Condition 5: consider only features, that have aP as one of they ends.
 253             //              For example, we do not need an arc, coincident to aP by its center.
 254             if (theEndPoint->pnt()->isEqual(aP1->pnt()) ||
 255                 theEndPoint->pnt()->isEqual(aP2->pnt())) {
 256               // Condition 6: only one edge can prolongate the chain. If several, we stop here.
 257               nbFound++;
 258               if (nbFound > 1)
 259                 return false;
 260
 261               // One found
 262               aNextEdgeFeature = aCoincFeature;
 263             }
 264           }
 265         }
 266       }
 267     }
 268   }
 269
 270   // Only one edge can prolongate the chain. If several or none, we stop here.
 271   if (nbFound != 1)
 272     return false;
 273
 274   // 2. So, we have the single edge, that prolongate the chain
 275
 276   // Condition 7: if we reached the very first edge of the chain
 277   if (aNextEdgeFeature == theFirstEdge)
 278     // Closed chain found
 279     return true;
 280
 281   // 3. Add the found edge to the chain
 282   if (isPrepend)
 283     theChain.push_front(aNextEdgeFeature);
 284   else
 285     theChain.push_back(aNextEdgeFeature);
 286   theProcessedEdgesSet.insert(aNextEdgeFeature);
 287
 288   // 4. Which end of aNextEdgeFeature we need to proceed
 289   std::shared_ptr<GeomDataAPI_Point2D> aP1, aP2;
 290   SketchPlugin_SegmentationTools::getFeaturePoints(aNextEdgeFeature, aP1, aP2);
 291   if (aP2->pnt()->isEqual(theEndPoint->pnt())) {
 292     // reversed
 293     aP2 = aP1;
 294   }
 295
 296   // 5. Continue gathering the chain (recursive)
 297   return findWireOneWay (theFirstEdge, aNextEdgeFeature, aP2, theEdgesSet,
 298                          theProcessedEdgesSet, theChain, isPrepend);
 299 }
 300
 301 static void setRefListValue(AttributeRefListPtr theList, int theListSize,
 302                             ObjectPtr theValue, int theIndex)
 303 {
 304   if (theIndex < theListSize) {
 305     ObjectPtr aCur = theList->object(theIndex);
 306     if (aCur != theValue)
 307       theList->substitute(aCur, theValue);
 308   }
 309   else
 310     theList->append(theValue);
 311 }
 312
 313 // Reorder shapes according to the wire's order
 314 static void reorderShapes(ListOfShape& theShapes, GeomShapePtr theWire)
 315 {
 316   std::set<GeomShapePtr, GeomAPI_Shape::Comparator> aShapes;
 317   aShapes.insert(theShapes.begin(), theShapes.end());
 318   theShapes.clear();
 319
 320   GeomWirePtr aWire(new GeomAPI_Wire(theWire));
 321   GeomAPI_WireExplorer anExp(aWire);
 322   for (; anExp.more(); anExp.next()) {
 323     GeomShapePtr aCurEdge = anExp.current();
 324     auto aFound = aShapes.find(aCurEdge);
 325     if (aFound != aShapes.end()) {
 326       theShapes.push_back(aCurEdge);
 327       aShapes.erase(aFound);
 328     }
 329   }
 330 }
 331
 332 static void removeLastFromIndex(AttributeRefListPtr theList, int theListSize, int& theLastIndex)
 333 {
 334   if (theLastIndex < theListSize) {
 335     std::set<int> anIndicesToRemove;
 336     for (; theLastIndex < theListSize; ++theLastIndex)
 337       anIndicesToRemove.insert(theLastIndex);
 338     theList->remove(anIndicesToRemove);
 339   }
 340 }
 341
 342 void SketchPlugin_Offset::addToSketch(const ListOfMakeShape& theOffsetAlgos)
 343 {
 344   AttributeRefListPtr aSelectedRefList = reflist(EDGES_ID());
 345   AttributeRefListPtr aBaseRefList = reflist(ENTITY_A());
 346   AttributeRefListPtr anOffsetRefList = reflist(ENTITY_B());
 347   AttributeIntArrayPtr anOffsetToBaseMap = intArray(ENTITY_C());
 348
 349   // compare the list of selected edges and the previously stored,
 350   // and store maping between them
 351   std::map<ObjectPtr, std::list<ObjectPtr> > aMapExistent;
 352   std::list<ObjectPtr> anObjectsToRemove;
 353   std::list<ObjectPtr> aSelectedList = aSelectedRefList->list();
 354   for (std::list<ObjectPtr>::iterator aSIt = aSelectedList.begin();
 355        aSIt != aSelectedList.end(); ++aSIt) {
 356     aMapExistent[*aSIt] = std::list<ObjectPtr>();
 357   }
 358   for (int anIndex = 0, aSize = anOffsetRefList->size(); anIndex < aSize; ++anIndex) {
 359     ObjectPtr aCurrent = anOffsetRefList->object(anIndex);
 360     int aBaseIndex = anOffsetToBaseMap->value(anIndex);
 361     if (aBaseIndex >= 0) {
 362       ObjectPtr aBaseObj = aBaseRefList->object(aBaseIndex);
 363       std::map<ObjectPtr, std::list<ObjectPtr> >::iterator aFound = aMapExistent.find(aBaseObj);
 364       if (aFound != aMapExistent.end())
 365         aFound->second.push_back(aCurrent);
 366       else
 367         anObjectsToRemove.push_back(aCurrent);
 368     }
 369     else
 370       anObjectsToRemove.push_back(aCurrent);
 371   }
 372
 373   // update lists of base shapes and of offset shapes
 374   int aBaseListSize = aBaseRefList->size();
 375   int anOffsetListSize = anOffsetRefList->size();
 376   int aBaseListIndex = 0, anOffsetListIndex = 0;
 377   std::list<int> anOffsetBaseBackRefs;
 378   std::set<GeomShapePtr, GeomAPI_Shape::ComparatorWithOri> aProcessedOffsets;
 379   for (std::list<ObjectPtr>::iterator aSIt = aSelectedList.begin();
 380        aSIt != aSelectedList.end(); ++aSIt) {
 381     // find an offseted edge
 382     FeaturePtr aBaseFeature = ModelAPI_Feature::feature(*aSIt);
 383     GeomShapePtr aBaseShape = aBaseFeature->lastResult()->shape();
 384     ListOfShape aNewShapes;
 385     for (ListOfMakeShape::const_iterator anAlgoIt = theOffsetAlgos.begin();
 386          anAlgoIt != theOffsetAlgos.end(); ++anAlgoIt) {
 387       (*anAlgoIt)->generated(aBaseShape, aNewShapes);
 388       if (!aNewShapes.empty()) {
 389         reorderShapes(aNewShapes, (*anAlgoIt)->shape());
 390         break;
 391       }
 392     }
 393
 394     // store base feature
 395     setRefListValue(aBaseRefList, aBaseListSize, *aSIt, aBaseListIndex);
 396
 397     // create or update an offseted feature
 398     const std::list<ObjectPtr>& anImages = aMapExistent[*aSIt];
 399     std::list<ObjectPtr>::const_iterator anImgIt = anImages.begin();
 400     for (ListOfShape::iterator aNewIt = aNewShapes.begin(); aNewIt != aNewShapes.end(); ++aNewIt) {
 401       FeaturePtr aNewFeature;
 402       if (anImgIt != anImages.end())
 403         aNewFeature = ModelAPI_Feature::feature(*anImgIt++);
 404       updateExistentOrCreateNew(*aNewIt, aNewFeature, anObjectsToRemove);
 405       aProcessedOffsets.insert(*aNewIt);
 406
 407       // store an offseted feature
 408       setRefListValue(anOffsetRefList, anOffsetListSize, aNewFeature, anOffsetListIndex);
 409
 410       anOffsetBaseBackRefs.push_back(aBaseListIndex);
 411       ++anOffsetListIndex;
 412     }
 413     ++aBaseListIndex;
 414     anObjectsToRemove.insert(anObjectsToRemove.end(), anImgIt, anImages.end());
 415   }
 416   // create arcs generated from vertices
 417   for (ListOfMakeShape::const_iterator anAlgoIt = theOffsetAlgos.begin();
 418        anAlgoIt != theOffsetAlgos.end(); ++anAlgoIt) {
 419     GeomShapePtr aCurWire = (*anAlgoIt)->shape();
 420     GeomAPI_ShapeExplorer anExp(aCurWire, GeomAPI_Shape::EDGE);
 421     for (; anExp.more(); anExp.next()) {
 422       GeomShapePtr aCurEdge = anExp.current();
 423       if (aProcessedOffsets.find(aCurEdge) == aProcessedOffsets.end()) {
 424         FeaturePtr aNewFeature;
 425         updateExistentOrCreateNew(aCurEdge, aNewFeature, anObjectsToRemove);
 426         aProcessedOffsets.insert(aCurEdge);
 427
 428         // store an offseted feature
 429         setRefListValue(anOffsetRefList, anOffsetListSize, aNewFeature, anOffsetListIndex);
 430
 431         anOffsetBaseBackRefs.push_back(-1);
 432         ++anOffsetListIndex;
 433       }
 434     }
 435   }
 436
 437   removeLastFromIndex(aBaseRefList, aBaseListSize, aBaseListIndex);
 438   removeLastFromIndex(anOffsetRefList, anOffsetListSize, anOffsetListIndex);
 439
 440   anOffsetToBaseMap->setSize((int)anOffsetBaseBackRefs.size(), false);
 441   int anIndex = 0;
 442   for (std::list<int>::iterator anIt = anOffsetBaseBackRefs.begin();
 443        anIt != anOffsetBaseBackRefs.end(); ++anIt) {
 444     anOffsetToBaseMap->setValue(anIndex++, *anIt, false);
 445   }
 446
 447   // remove unused objects
 448   std::set<FeaturePtr> aSet;
 449   for (std::list<ObjectPtr>::iterator anIt = anObjectsToRemove.begin();
 450        anIt != anObjectsToRemove.end(); ++anIt) {
 451     FeaturePtr aFeature = ModelAPI_Feature::feature(*anIt);
 452     if (aFeature)
 453       aSet.insert(aFeature);
 454   }
 455   ModelAPI_Tools::removeFeaturesAndReferences(aSet);
 456 }
 457
 458 static void findOrCreateFeatureByKind(SketchPlugin_Sketch* theSketch,
 459                                       const std::string& theFeatureKind,
 460                                       FeaturePtr& theFeature,
 461                                       std::list<ObjectPtr>& thePoolOfFeatures)
 462 {
 463   if (theFeature) {
 464     // check the feature type is the same as required
 465     if (theFeature->getKind() != theFeatureKind) {
 466       // return feature to the pool and try to find the most appropriate
 467       thePoolOfFeatures.push_back(theFeature);
 468       theFeature = FeaturePtr();
 469     }
 470   }
 471   if (!theFeature) {
 472     // try to find appropriate feature in the pool
 473     for (std::list<ObjectPtr>::iterator it = thePoolOfFeatures.begin();
 474          it != thePoolOfFeatures.end(); ++it) {
 475       FeaturePtr aCurFeature = ModelAPI_Feature::feature(*it);
 476       if (aCurFeature->getKind() == theFeatureKind) {
 477         theFeature = aCurFeature;
 478         thePoolOfFeatures.erase(it);
 479         break;
 480       }
 481     }
 482     // feature not found, create new
 483     if (!theFeature)
 484       theFeature = theSketch->addFeature(theFeatureKind);
 485   }
 486 }
 487
 488 void SketchPlugin_Offset::updateExistentOrCreateNew(const GeomShapePtr& theShape,
 489                                                     FeaturePtr& theFeature,
 490                                                     std::list<ObjectPtr>& thePoolOfFeatures)
 491 {
 492   if (theShape->shapeType() != GeomAPI_Shape::EDGE)
 493     return;
 494
 495   std::shared_ptr<GeomAPI_Edge> aResEdge(new GeomAPI_Edge(theShape));
 496
 497   std::shared_ptr<GeomAPI_Pnt2d> aFP, aLP;
 498   std::shared_ptr<GeomAPI_Pnt> aFP3d = aResEdge->firstPoint();
 499   std::shared_ptr<GeomAPI_Pnt> aLP3d = aResEdge->lastPoint();
 500   if (aFP3d && aLP3d) {
 501     aFP = sketch()->to2D(aFP3d);
 502     aLP = sketch()->to2D(aLP3d);
 503   }
 504
 505   if (aResEdge->isLine()) {
 506     findOrCreateFeatureByKind(sketch(), SketchPlugin_Line::ID(), theFeature, thePoolOfFeatures);
 507
 508     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 509       (theFeature->attribute(SketchPlugin_Line::START_ID()))->setValue(aFP);
 510     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 511       (theFeature->attribute(SketchPlugin_Line::END_ID()))->setValue(aLP);
 512   }
 513   else if (aResEdge->isArc()) {
 514     std::shared_ptr<GeomAPI_Circ> aCircEdge = aResEdge->circle();
 515     std::shared_ptr<GeomAPI_Pnt> aCP3d = aCircEdge->center();
 516     std::shared_ptr<GeomAPI_Pnt2d> aCP = sketch()->to2D(aCP3d);
 517
 518     findOrCreateFeatureByKind(sketch(), SketchPlugin_Arc::ID(), theFeature, thePoolOfFeatures);
 519
 520     GeomDirPtr aCircNormal = aCircEdge->normal();
 521     GeomDirPtr aSketchNormal = sketch()->coordinatePlane()->normal();
 522     if (aSketchNormal->dot(aCircNormal) < -tolerance)
 523       std::swap(aFP, aLP);
 524
 525     bool aWasBlocked = theFeature->data()->blockSendAttributeUpdated(true);
 526     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 527       (theFeature->attribute(SketchPlugin_Arc::END_ID()))->setValue(aLP);
 528     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 529       (theFeature->attribute(SketchPlugin_Arc::START_ID()))->setValue(aFP);
 530     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 531       (theFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(aCP);
 532     theFeature->data()->blockSendAttributeUpdated(aWasBlocked);
 533   }
 534   else if (aResEdge->isCircle()) {
 535     std::shared_ptr<GeomAPI_Circ> aCircEdge = aResEdge->circle();
 536     std::shared_ptr<GeomAPI_Pnt> aCP3d = aCircEdge->center();
 537     std::shared_ptr<GeomAPI_Pnt2d> aCP = sketch()->to2D(aCP3d);
 538
 539     findOrCreateFeatureByKind(sketch(), SketchPlugin_Circle::ID(), theFeature, thePoolOfFeatures);
 540
 541     std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 542       (theFeature->attribute(SketchPlugin_Circle::CENTER_ID()))->setValue(aCP);
 543     theFeature->real(SketchPlugin_Circle::RADIUS_ID())->setValue(aCircEdge->radius());
 544   }
 545   else if (aResEdge->isEllipse()) {
 546     std::shared_ptr<GeomAPI_Ellipse> anEllipseEdge = aResEdge->ellipse();
 547
 548     GeomPointPtr aCP3d = anEllipseEdge->center();
 549     GeomPnt2dPtr aCP = sketch()->to2D(aCP3d);
 550
 551     GeomPointPtr aFocus3d = anEllipseEdge->firstFocus();
 552     GeomPnt2dPtr aFocus = sketch()->to2D(aFocus3d);
 553
 554     if (aFP3d && aLP3d) {
 555       // Elliptic arc
 556       findOrCreateFeatureByKind(sketch(), SketchPlugin_EllipticArc::ID(),
 557                                 theFeature, thePoolOfFeatures);
 558
 559       bool aWasBlocked = theFeature->data()->blockSendAttributeUpdated(true);
 560       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 561         (theFeature->attribute(SketchPlugin_EllipticArc::CENTER_ID()))->setValue(aCP);
 562       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 563         (theFeature->attribute(SketchPlugin_EllipticArc::FIRST_FOCUS_ID()))->setValue(aFocus);
 564       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 565         (theFeature->attribute(SketchPlugin_EllipticArc::START_POINT_ID()))->setValue(aFP);
 566       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 567         (theFeature->attribute(SketchPlugin_EllipticArc::END_POINT_ID()))->setValue(aLP);
 568       theFeature->data()->blockSendAttributeUpdated(aWasBlocked);
 569     }
 570     else {
 571       // Ellipse
 572       findOrCreateFeatureByKind(sketch(), SketchPlugin_Ellipse::ID(),
 573                                 theFeature, thePoolOfFeatures);
 574
 575       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 576         (theFeature->attribute(SketchPlugin_Ellipse::CENTER_ID()))->setValue(aCP);
 577       std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 578         (theFeature->attribute(SketchPlugin_Ellipse::FIRST_FOCUS_ID()))->setValue(aFocus);
 579       theFeature->real(SketchPlugin_Ellipse::MINOR_RADIUS_ID())->setValue(
 580         anEllipseEdge->minorRadius());
 581     }
 582   }
 583   else {
 584     // convert to b-spline
 585     mkBSpline(theFeature, aResEdge, thePoolOfFeatures);
 586   }
 587
 588   if (theFeature.get()) {
 589     theFeature->boolean(SketchPlugin_SketchEntity::COPY_ID())->setValue(true);
 590     theFeature->execute();
 591
 592     static Events_ID aRedisplayEvent = Events_Loop::eventByName(EVENT_OBJECT_TO_REDISPLAY);
 593     ModelAPI_EventCreator::get()->sendUpdated(theFeature, aRedisplayEvent);
 594     const std::list<ResultPtr>& aResults = theFeature->results();
 595     for (std::list<ResultPtr>::const_iterator anIt = aResults.begin();
 596          anIt != aResults.end(); ++anIt)
 597       ModelAPI_EventCreator::get()->sendUpdated(*anIt, aRedisplayEvent);
 598   }
 599 }
 600
 601 void SketchPlugin_Offset::mkBSpline (FeaturePtr& theResult,
 602                                      const GeomEdgePtr& theEdge,
 603                                      std::list<ObjectPtr>& thePoolOfFeatures)
 604 {
 605   GeomCurvePtr aCurve (new GeomAPI_Curve (theEdge));
 606   // Forced conversion to b-spline, if aCurve is not b-spline
 607   GeomBSplinePtr aBSpline = GeomAPI_BSpline::convertToBSpline(aCurve);
 608
 609   const std::string& aBSplineKind = aBSpline->isPeriodic() ? SketchPlugin_BSplinePeriodic::ID()
 610                                                            : SketchPlugin_BSpline::ID();
 611   findOrCreateFeatureByKind(sketch(), aBSplineKind, theResult, thePoolOfFeatures);
 612
 613   theResult->integer(SketchPlugin_BSpline::DEGREE_ID())->setValue(aBSpline->degree());
 614
 615   AttributePoint2DArrayPtr aPolesAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2DArray>
 616     (theResult->attribute(SketchPlugin_BSpline::POLES_ID()));
 617   std::list<GeomPointPtr> aPoles = aBSpline->poles();
 618   aPolesAttr->setSize((int)aPoles.size());
 619   std::list<GeomPointPtr>::iterator anIt = aPoles.begin();
 620   for (int anIndex = 0; anIt != aPoles.end(); ++anIt, ++anIndex) {
 621     GeomPnt2dPtr aPoleInSketch = sketch()->to2D(*anIt);
 622     aPolesAttr->setPnt(anIndex, aPoleInSketch);
 623   }
 624
 625   AttributeDoubleArrayPtr aWeightsAttr =
 626       theResult->data()->realArray(SketchPlugin_BSpline::WEIGHTS_ID());
 627   std::list<double> aWeights = aBSpline->weights();
 628   if (aWeights.empty()) { // rational B-spline
 629     int aSize = (int)aPoles.size();
 630     aWeightsAttr->setSize(aSize);
 631     for (int anIndex = 0; anIndex < aSize; ++anIndex)
 632       aWeightsAttr->setValue(anIndex, 1.0);
 633   }
 634   else { // non-rational B-spline
 635     aWeightsAttr->setSize((int)aWeights.size());
 636     std::list<double>::iterator anIt = aWeights.begin();
 637     for (int anIndex = 0; anIt != aWeights.end(); ++anIt, ++anIndex)
 638       aWeightsAttr->setValue(anIndex, *anIt);
 639   }
 640
 641   AttributeDoubleArrayPtr aKnotsAttr =
 642       theResult->data()->realArray(SketchPlugin_BSpline::KNOTS_ID());
 643   std::list<double> aKnots = aBSpline->knots();
 644   int aSize = (int)aKnots.size();
 645   aKnotsAttr->setSize(aSize);
 646   std::list<double>::iterator aKIt = aKnots.begin();
 647   for (int index = 0; index < aSize; ++index, ++aKIt)
 648     aKnotsAttr->setValue(index, *aKIt);
 649
 650   AttributeIntArrayPtr aMultsAttr =
 651       theResult->data()->intArray(SketchPlugin_BSpline::MULTS_ID());
 652   std::list<int> aMultiplicities = aBSpline->mults();
 653   aSize = (int)aMultiplicities.size();
 654   aMultsAttr->setSize(aSize);
 655   std::list<int>::iterator aMIt = aMultiplicities.begin();
 656   for (int index = 0; index < aSize; ++index, ++aMIt)
 657     aMultsAttr->setValue(index, *aMIt);
 658 }
 659
 660 void SketchPlugin_Offset::attributeChanged(const std::string& theID)
 661 {
 662   if (theID == EDGES_ID()) {
 663     AttributeRefListPtr aSelected = reflist(EDGES_ID());
 664     if (aSelected->size() == 0) {
 665       // Clear list of objects
 666       AttributeRefListPtr anOffsetAttr = reflist(SketchPlugin_Constraint::ENTITY_B());
 667       std::list<ObjectPtr> anOffsetList = anOffsetAttr->list();
 668       std::set<FeaturePtr> aFeaturesToBeRemoved;
 669       for (std::list<ObjectPtr>::iterator anIt = anOffsetList.begin();
 670            anIt != anOffsetList.end(); ++anIt) {
 671         FeaturePtr aFeature = ModelAPI_Feature::feature(*anIt);
 672         if (aFeature)
 673           aFeaturesToBeRemoved.insert(aFeature);
 674       }
 675
 676       reflist(SketchPlugin_Constraint::ENTITY_A())->clear();
 677       anOffsetAttr->clear();
 678       intArray(SketchPlugin_Constraint::ENTITY_C())->setSize(0);
 679
 680       ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
 681     }
 682   }
 683 }
 684
 685 bool SketchPlugin_Offset::customAction(const std::string& theActionId)
 686 {
 687   bool isOk = false;
 688   if (theActionId == ADD_WIRE_ACTION_ID()) {
 689     isOk = findWires();
 690   }
 691   else {
 692     std::string aMsg = "Error: Feature \"%1\" does not support action \"%2\".";
 693     Events_InfoMessage("SketchPlugin_Offset", aMsg).arg(getKind()).arg(theActionId).send();
 694   }
 695   return isOk;
 696 }
 697
 698 bool SketchPlugin_Offset::findWires()
 699 {
 700   AttributeRefListPtr aSelectedEdges = reflist(EDGES_ID());
 701   std::list<ObjectPtr> anEdgesList = aSelectedEdges->list();
 702
 703   // Empty set
 704   std::set<FeaturePtr> anEdgesSet;
 705
 706   // Processed set
 707   std::set<FeaturePtr> aProcessedEdgesSet;
 708
 709   // Put all selected edges in a set to avoid adding them in reflist(EDGES_ID())
 710   std::set<FeaturePtr> aSelectedSet;
 711   std::list<ObjectPtr>::const_iterator anEdgesIt = anEdgesList.begin();
 712   for (; anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 713     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 714     if (aFeature) {
 715       aSelectedSet.insert(aFeature);
 716     }
 717   }
 718
 719   bool aWasBlocked = data()->blockSendAttributeUpdated(true);
 720
 721   // Gather chains of edges
 722   for (anEdgesIt = anEdgesList.begin(); anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 723     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 724     if (aFeature.get()) {
 725       if (aProcessedEdgesSet.find(aFeature) != aProcessedEdgesSet.end())
 726         continue;
 727       aProcessedEdgesSet.insert(aFeature);
 728
 729       // End points (if any)
 730       std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
 731       SketchPlugin_SegmentationTools::getFeaturePoints(aFeature, aStartPoint, anEndPoint);
 732
 733       std::list<FeaturePtr> aChain;
 734       aChain.push_back(aFeature);
 735       bool isClosed = findWireOneWay(aFeature, aFeature, aStartPoint, anEdgesSet,
 736                                      aProcessedEdgesSet, aChain, true);
 737       if (!isClosed) {
 738         findWireOneWay(aFeature, aFeature, anEndPoint, anEdgesSet,
 739                        aProcessedEdgesSet, aChain, false);
 740       }
 741
 742       std::list<FeaturePtr>::iterator aChainIt = aChain.begin();
 743       for (; aChainIt != aChain.end(); ++aChainIt) {
 744         FeaturePtr aChainFeature = (*aChainIt);
 745         if (aSelectedSet.find(aChainFeature) == aSelectedSet.end()) {
 746           aSelectedEdges->append(aChainFeature->lastResult());
 747         }
 748       }
 749     }
 750   }
 751   // TODO: hilight selection in the viewer
 752
 753   data()->blockSendAttributeUpdated(aWasBlocked);
 754   return true;
 755 }
 756
 757
 758 AISObjectPtr SketchPlugin_Offset::getAISObject(AISObjectPtr thePrevious)
 759 {
 760   if (!sketch())
 761     return thePrevious;
 762
 763   AISObjectPtr anAIS = SketcherPrs_Factory::offsetObject(this, sketch(),
 764     thePrevious);
 765   return anAIS;
 766 }