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_AttributeRefList.h>
  42 #include <ModelAPI_ResultConstruction.h>
  43 #include <ModelAPI_Tools.h>
  44
  45 #include <GeomAlgoAPI_Offset.h>
  46 #include <GeomAlgoAPI_ShapeTools.h>
  47 #include <GeomAlgoAPI_WireBuilder.h>
  48
  49 #include <GeomAPI_Edge.h>
  50 #include <GeomAPI_Circ.h>
  51 #include <GeomAPI_Ellipse.h>
  52 #include <GeomAPI_BSpline.h>
  53
  54 #include <GeomDataAPI_Point2D.h>
  55 #include <GeomDataAPI_Point2DArray.h>
  56
  57 #include <iostream>
  58
  59 SketchPlugin_Offset::SketchPlugin_Offset()
  60   : SketchPlugin_SketchEntity()
  61 {
  62 }
  63
  64 void SketchPlugin_Offset::initDerivedClassAttributes()
  65 {
  66   data()->addAttribute(EDGES_ID(), ModelAPI_AttributeRefList::typeId());
  67   data()->addAttribute(VALUE_ID(), ModelAPI_AttributeDouble::typeId());
  68   data()->addAttribute(REVERSED_ID(), ModelAPI_AttributeBoolean::typeId());
  69 }
  70
  71 void SketchPlugin_Offset::execute()
  72 {
  73   ModelAPI_Tools::removeFeaturesAndReferences(myCreatedFeatures);
  74   myCreatedFeatures.clear();
  75
  76   SketchPlugin_Sketch* aSketch = sketch();
  77   if (!aSketch) return;
  78
  79   // 1. Sketch plane
  80   std::shared_ptr<GeomAPI_Pln> aPlane = aSketch->plane();
  81
  82   // 2. Offset value
  83   AttributeDoublePtr aValueAttr = real(VALUE_ID());
  84   if (!aValueAttr->isInitialized()) return;
  85   double aValue = aValueAttr->value();
  86   const double tolerance = 1.e-7;
  87   if (aValue < tolerance) return;
  88
  89   // 2.a. Reversed?
  90   AttributeBooleanPtr aReversedAttr = boolean(REVERSED_ID());
  91   if (!aReversedAttr->isInitialized()) return;
  92   if (aReversedAttr->value()) aValue = -aValue; // reverse offset direction
  93
  94   // 3. List of all selected edges
  95   AttributeRefListPtr aSelectedEdges = reflist(EDGES_ID());
  96   std::list<ObjectPtr> anEdgesList = aSelectedEdges->list();
  97
  98   // 4. Put all selected edges in a set to pass them into findWireOneWay() below
  99   std::set<FeaturePtr> anEdgesSet;
 100   std::list<ObjectPtr>::const_iterator anEdgesIt = anEdgesList.begin();
 101   for (; anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 102     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 103     if (aFeature) {
 104       anEdgesSet.insert(aFeature);
 105     }
 106   }
 107
 108   // 5. Gather wires and make offset for each wire
 109   for (anEdgesIt = anEdgesList.begin(); anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 110     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 111     if (aFeature.get()) {
 112       if (anEdgesSet.find(aFeature) == anEdgesSet.end())
 113         continue;
 114
 115       // 5.a. End points (if any)
 116       std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
 117       SketchPlugin_SegmentationTools::getFeaturePoints(aFeature, aStartPoint, anEndPoint);
 118
 119       // 5.b. Find a chain of edges
 120       std::list<FeaturePtr> aChain;
 121       aChain.push_back(aFeature);
 122       if (aStartPoint && anEndPoint) { // not closed edge
 123         bool isClosed = findWireOneWay(aFeature, aFeature, aStartPoint, anEdgesSet, aChain);
 124         if (!isClosed)
 125           findWireOneWay(aFeature, aFeature, anEndPoint, anEdgesSet, aChain);
 126       }
 127       std::set<FeaturePtr>::iterator aPos = anEdgesSet.find(aFeature);
 128       if (aPos != anEdgesSet.end())
 129         anEdgesSet.erase(aPos);
 130
 131       // 5.c. Make wire
 132       ListOfShape aTopoChain;
 133       std::list<FeaturePtr>::iterator aChainIt = aChain.begin();
 134       for (; aChainIt != aChain.end(); ++aChainIt) {
 135         FeaturePtr aChainFeature = (*aChainIt);
 136         GeomShapePtr aTopoEdge = aChainFeature->lastResult()->shape();
 137         if (aTopoEdge->shapeType() == GeomAPI_Shape::EDGE) {
 138           aTopoChain.push_back(aTopoEdge);
 139         }
 140       }
 141       GeomShapePtr anEdgeOrWire = GeomAlgoAPI_WireBuilder::wire(aTopoChain);
 142
 143       // 5.d. Make offset for each wire
 144       std::shared_ptr<GeomAPI_Shape> anOffsetShape =
 145         GeomAlgoAPI_Offset::OffsetInPlane(aPlane, anEdgeOrWire, aValue);
 146
 147       // 5.e. Store offset results.
 148       //      Create sketch feature for each edge of anOffsetShape, and also store
 149       //      created features in myCreatedFeatures to remove them on next execute()
 150       addToSketch(anOffsetShape);
 151     }
 152   }
 153 }
 154
 155 bool SketchPlugin_Offset::findWireOneWay (const FeaturePtr& theFirstEdge,
 156                                           const FeaturePtr& theEdge,
 157                                           const std::shared_ptr<GeomDataAPI_Point2D>& theEndPoint,
 158                                           std::set<FeaturePtr>& theEdgesSet,
 159                                           std::list<FeaturePtr>& theChain)
 160 {
 161   // 1. Find a single edge, coincident to theEndPoint by one of its ends
 162   if (!theEndPoint) return false;
 163
 164   std::shared_ptr<GeomAPI_Pnt2d> aP2d = theEndPoint->pnt();
 165
 166   FeaturePtr aNextEdgeFeature;
 167   int nbFound = 0;
 168
 169   std::set<AttributePoint2DPtr> aCoincPoints;
 170   std::map<AttributePoint2DArrayPtr, int> aCoincPointsInArray;
 171   SketchPlugin_Tools::findPointsCoincidentToPoint(theEndPoint, aCoincPoints, aCoincPointsInArray);
 172
 173   // store all found attributes to a single array
 174   std::set<AttributePtr> anAllCoincPoints;
 175   anAllCoincPoints.insert(aCoincPoints.begin(), aCoincPoints.end());
 176   for (auto it = aCoincPointsInArray.begin(); it != aCoincPointsInArray.end(); ++it)
 177     anAllCoincPoints.insert(it->first);
 178
 179   std::set<AttributePtr>::iterator aPointsIt = anAllCoincPoints.begin();
 180   for (; aPointsIt != anAllCoincPoints.end(); aPointsIt++) {
 181     AttributePtr aP = (*aPointsIt);
 182     FeaturePtr aCoincFeature = std::dynamic_pointer_cast<ModelAPI_Feature>(aP->owner());
 183
 184     // Condition 1: not a point feature
 185     if (aCoincFeature->getKind() != SketchPlugin_Point::ID()) {
 186       // Condition 2: it is not the current edge
 187       if (aCoincFeature != theEdge) {
 188         // Condition 3: it is in the set of interest.
 189         //              Empty set means all sketch edges.
 190         bool isInSet = true;
 191         if (theEdgesSet.size()) {
 192           isInSet = (theEdgesSet.find(aCoincFeature) != theEdgesSet.end());
 193         }
 194         if (isInSet) {
 195           // Condition 4: consider only features with two end points
 196           std::shared_ptr<GeomDataAPI_Point2D> aP1, aP2;
 197           SketchPlugin_SegmentationTools::getFeaturePoints(aCoincFeature, aP1, aP2);
 198           if (aP1 && aP2) {
 199             // Condition 5: consider only features, that have aP as one of they ends.
 200             //              For example, we do not need an arc, coincident to aP by its center.
 201             if (theEndPoint->pnt()->isEqual(aP1->pnt()) ||
 202                 theEndPoint->pnt()->isEqual(aP2->pnt())) {
 203               // Condition 6: only one edge can prolongate the chain. If several, we stop here.
 204               nbFound++;
 205               if (nbFound > 1)
 206                 return false;
 207
 208               // One found
 209               aNextEdgeFeature = aCoincFeature;
 210             }
 211           }
 212         }
 213       }
 214     }
 215   }
 216
 217   // Only one edge can prolongate the chain. If several or none, we stop here.
 218   if (nbFound != 1)
 219     return false;
 220
 221   // 2. So, we have the single edge, that prolongate the chain
 222
 223   // Condition 7: if we reached the very first edge of the chain
 224   if (aNextEdgeFeature == theFirstEdge)
 225     // Closed chain found
 226     return true;
 227
 228   // 3. Add the found edge to the chain
 229   theChain.push_back(aNextEdgeFeature);
 230   // remove from the set, if the set is used
 231   if (theEdgesSet.size()) {
 232     std::set<FeaturePtr>::iterator aPos = theEdgesSet.find(aNextEdgeFeature);
 233     if (aPos != theEdgesSet.end())
 234       theEdgesSet.erase(aPos);
 235   }
 236
 237   // 4. Which end of aNextEdgeFeature we need to proceed
 238   std::shared_ptr<GeomDataAPI_Point2D> aP1, aP2;
 239   SketchPlugin_SegmentationTools::getFeaturePoints(aNextEdgeFeature, aP1, aP2);
 240   if (aP2->pnt()->isEqual(theEndPoint->pnt())) {
 241     // reversed
 242     aP2 = aP1;
 243   }
 244
 245   // 5. Continue gathering the chain (recursive)
 246   return findWireOneWay (theFirstEdge, aNextEdgeFeature, aP2, theEdgesSet, theChain);
 247 }
 248
 249 void SketchPlugin_Offset::addToSketch(const std::shared_ptr<GeomAPI_Shape>& anOffsetShape)
 250 {
 251   //GeomAPI_ShapeExplorer::GeomAPI_ShapeExplorer
 252   ListOfShape aResEdges = GeomAlgoAPI_ShapeTools::getLowLevelSubShapes(anOffsetShape);
 253   std::list<GeomShapePtr>::const_iterator aResEdgesIt = aResEdges.begin();
 254   for (; aResEdgesIt != aResEdges.end(); aResEdgesIt++) {
 255     GeomShapePtr aResShape = (*aResEdgesIt);
 256     if (aResShape->shapeType() == GeomAPI_Shape::EDGE) {
 257       // Add new feature
 258       FeaturePtr aResFeature;
 259       std::shared_ptr<GeomAPI_Edge> aResEdge (new GeomAPI_Edge(aResShape));
 260
 261       std::shared_ptr<GeomAPI_Pnt2d> aFP, aLP;
 262       std::shared_ptr<GeomAPI_Pnt> aFP3d = aResEdge->firstPoint();
 263       std::shared_ptr<GeomAPI_Pnt> aLP3d = aResEdge->lastPoint();
 264       //if (aFP3d.get() && aLP3d.get()) {
 265       if (aFP3d && aLP3d) {
 266         aFP = sketch()->to2D(aFP3d);
 267         aLP = sketch()->to2D(aLP3d);
 268       }
 269
 270       if (aResEdge->isLine()) {
 271         aResFeature = sketch()->addFeature(SketchPlugin_Line::ID());
 272
 273         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 274           (aResFeature->attribute(SketchPlugin_Line::START_ID()))->setValue(aFP);
 275         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 276           (aResFeature->attribute(SketchPlugin_Line::END_ID()))->setValue(aLP);
 277       }
 278       else if (aResEdge->isArc()) {
 279         std::shared_ptr<GeomAPI_Circ> aCircEdge = aResEdge->circle();
 280         std::shared_ptr<GeomAPI_Pnt> aCP3d = aCircEdge->center();
 281         std::shared_ptr<GeomAPI_Pnt2d> aCP = sketch()->to2D(aCP3d);
 282
 283         aResFeature = sketch()->addFeature(SketchPlugin_Arc::ID());
 284
 285         bool aWasBlocked = aResFeature->data()->blockSendAttributeUpdated(true);
 286         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 287           (aResFeature->attribute(SketchPlugin_Arc::CENTER_ID()))->setValue(aCP);
 288         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 289           (aResFeature->attribute(SketchPlugin_Arc::START_ID()))->setValue(aFP);
 290         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 291           (aResFeature->attribute(SketchPlugin_Arc::END_ID()))->setValue(aLP);
 292         aResFeature->data()->blockSendAttributeUpdated(aWasBlocked);
 293       }
 294       else if (aResEdge->isCircle()) {
 295         std::shared_ptr<GeomAPI_Circ> aCircEdge = aResEdge->circle();
 296         std::shared_ptr<GeomAPI_Pnt> aCP3d = aCircEdge->center();
 297         std::shared_ptr<GeomAPI_Pnt2d> aCP = sketch()->to2D(aCP3d);
 298
 299         aResFeature = sketch()->addFeature(SketchPlugin_Circle::ID());
 300         std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 301           (aResFeature->attribute(SketchPlugin_Circle::CENTER_ID()))->setValue(aCP);
 302         aResFeature->real(SketchPlugin_Circle::RADIUS_ID())->setValue(aCircEdge->radius());
 303       }
 304       else if (aResEdge->isEllipse()) {
 305         std::shared_ptr<GeomAPI_Ellipse> anEllipseEdge = aResEdge->ellipse();
 306
 307         GeomPointPtr aCP3d = anEllipseEdge->center();
 308         GeomPnt2dPtr aCP = sketch()->to2D(aCP3d);
 309
 310         GeomPointPtr aFocus3d = anEllipseEdge->firstFocus();
 311         GeomPnt2dPtr aFocus = sketch()->to2D(aFocus3d);
 312
 313         if (aFP3d && aLP3d) {
 314           // Elliptic arc
 315           aResFeature = sketch()->addFeature(SketchPlugin_EllipticArc::ID());
 316
 317           bool aWasBlocked = aResFeature->data()->blockSendAttributeUpdated(true);
 318           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 319             (aResFeature->attribute(SketchPlugin_EllipticArc::CENTER_ID()))->setValue(aCP);
 320           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 321             (aResFeature->attribute(SketchPlugin_EllipticArc::FIRST_FOCUS_ID()))->setValue(aFocus);
 322           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 323             (aResFeature->attribute(SketchPlugin_EllipticArc::START_POINT_ID()))->setValue(aFP);
 324           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 325             (aResFeature->attribute(SketchPlugin_EllipticArc::END_POINT_ID()))->setValue(aLP);
 326           aResFeature->data()->blockSendAttributeUpdated(aWasBlocked);
 327         }
 328         else {
 329           // Ellipse
 330           aResFeature = sketch()->addFeature(SketchPlugin_Ellipse::ID());
 331
 332           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 333             (aResFeature->attribute(SketchPlugin_Ellipse::CENTER_ID()))->setValue(aCP);
 334           std::dynamic_pointer_cast<GeomDataAPI_Point2D>
 335             (aResFeature->attribute(SketchPlugin_Ellipse::FIRST_FOCUS_ID()))->setValue(aFocus);
 336           aResFeature->real(SketchPlugin_Ellipse::MINOR_RADIUS_ID())->setValue(anEllipseEdge->minorRadius());
 337         }
 338       }
 339       else if (aResEdge->isBSpline()) {
 340         mkBSpline(aResFeature, aResEdge);
 341       }
 342       else {
 343       }
 344
 345       if (aResFeature.get()) {
 346         myCreatedFeatures.insert(aResFeature);
 347
 348         aResFeature->boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->setValue
 349           (boolean(SketchPlugin_SketchEntity::AUXILIARY_ID())->value());
 350         aResFeature->execute();
 351       }
 352     }
 353   }
 354 }
 355
 356 void SketchPlugin_Offset::mkBSpline (FeaturePtr& theResult,
 357                                      const GeomEdgePtr& theEdge)
 358 {
 359   if (!theEdge->isBSpline())
 360     return;
 361
 362   GeomCurvePtr aCurve (new GeomAPI_Curve (theEdge));
 363   GeomAPI_BSpline aBSpline (aCurve);
 364
 365   if (aBSpline.isPeriodic())
 366     theResult = sketch()->addFeature(SketchPlugin_BSplinePeriodic::ID());
 367   else
 368     theResult = sketch()->addFeature(SketchPlugin_BSpline::ID());
 369
 370   theResult->integer(SketchPlugin_BSpline::DEGREE_ID())->setValue(aBSpline.degree());
 371
 372   AttributePoint2DArrayPtr aPolesAttr = std::dynamic_pointer_cast<GeomDataAPI_Point2DArray>
 373     (theResult->attribute(SketchPlugin_BSpline::POLES_ID()));
 374   std::list<GeomPointPtr> aPoles = aBSpline.poles();
 375   aPolesAttr->setSize((int)aPoles.size());
 376   std::list<GeomPointPtr>::iterator anIt = aPoles.begin();
 377   for (int anIndex = 0; anIt != aPoles.end(); ++anIt, ++anIndex) {
 378     GeomPnt2dPtr aPoleInSketch = sketch()->to2D(*anIt);
 379     aPolesAttr->setPnt(anIndex, aPoleInSketch);
 380   }
 381
 382   AttributeDoubleArrayPtr aWeightsAttr =
 383       theResult->data()->realArray(SketchPlugin_BSpline::WEIGHTS_ID());
 384   std::list<double> aWeights = aBSpline.weights();
 385   if (aWeights.empty()) { // rational B-spline
 386     int aSize = (int)aPoles.size();
 387     aWeightsAttr->setSize(aSize);
 388     for (int anIndex = 0; anIndex < aSize; ++anIndex)
 389       aWeightsAttr->setValue(anIndex, 1.0);
 390   }
 391   else { // non-rational B-spline
 392     aWeightsAttr->setSize((int)aWeights.size());
 393     std::list<double>::iterator anIt = aWeights.begin();
 394     for (int anIndex = 0; anIt != aWeights.end(); ++anIt, ++anIndex)
 395       aWeightsAttr->setValue(anIndex, *anIt);
 396   }
 397
 398   AttributeDoubleArrayPtr aKnotsAttr =
 399       theResult->data()->realArray(SketchPlugin_BSpline::KNOTS_ID());
 400   std::list<double> aKnots = aBSpline.knots();
 401   int aSize = (int)aKnots.size();
 402   aKnotsAttr->setSize(aSize);
 403   std::list<double>::iterator aKIt = aKnots.begin();
 404   for (int index = 0; index < aSize; ++index, ++aKIt)
 405     aKnotsAttr->setValue(index, *aKIt);
 406
 407   AttributeIntArrayPtr aMultsAttr =
 408       theResult->data()->intArray(SketchPlugin_BSpline::MULTS_ID());
 409   std::list<int> aMultiplicities = aBSpline.mults();
 410   aSize = (int)aMultiplicities.size();
 411   aMultsAttr->setSize(aSize);
 412   std::list<int>::iterator aMIt = aMultiplicities.begin();
 413   for (int index = 0; index < aSize; ++index, ++aMIt)
 414     aMultsAttr->setValue(index, *aMIt);
 415 }
 416
 417 void SketchPlugin_Offset::attributeChanged(const std::string& theID)
 418 {
 419   ModelAPI_Tools::removeFeaturesAndReferences(myCreatedFeatures);
 420   myCreatedFeatures.clear();
 421 }
 422
 423 bool SketchPlugin_Offset::customAction(const std::string& theActionId)
 424 {
 425   bool isOk = false;
 426   if (theActionId == ADD_WIRE_ACTION_ID()) {
 427     isOk = findWires();
 428   }
 429   else {
 430     std::string aMsg = "Error: Feature \"%1\" does not support action \"%2\".";
 431     Events_InfoMessage("SketchPlugin_Offset", aMsg).arg(getKind()).arg(theActionId).send();
 432   }
 433   return isOk;
 434 }
 435
 436 bool SketchPlugin_Offset::findWires()
 437 {
 438   AttributeRefListPtr aSelectedEdges = reflist(EDGES_ID());
 439   std::list<ObjectPtr> anEdgesList = aSelectedEdges->list();
 440
 441   // Empty set
 442   std::set<FeaturePtr> anEdgesSet;
 443
 444   // Processed set
 445   std::set<FeaturePtr> aProcessedSet;
 446
 447   // Put all selected edges in a set to avoid adding them in reflist(EDGES_ID())
 448   std::set<FeaturePtr> aSelectedSet;
 449   std::list<ObjectPtr>::const_iterator anEdgesIt = anEdgesList.begin();
 450   for (; anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 451     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 452     if (aFeature) {
 453       aSelectedSet.insert(aFeature);
 454     }
 455   }
 456
 457   // Gather chains of edges
 458   for (anEdgesIt = anEdgesList.begin(); anEdgesIt != anEdgesList.end(); anEdgesIt++) {
 459     FeaturePtr aFeature = ModelAPI_Feature::feature(*anEdgesIt);
 460     if (aFeature.get()) {
 461       if (aProcessedSet.find(aFeature) != aProcessedSet.end())
 462         continue;
 463       aProcessedSet.insert(aFeature);
 464
 465       // End points (if any)
 466       std::shared_ptr<GeomDataAPI_Point2D> aStartPoint, anEndPoint;
 467       SketchPlugin_SegmentationTools::getFeaturePoints(aFeature, aStartPoint, anEndPoint);
 468
 469       std::list<FeaturePtr> aChain;
 470       aChain.push_back(aFeature);
 471       bool isClosed = findWireOneWay(aFeature, aFeature, aStartPoint, anEdgesSet, aChain);
 472       if (!isClosed)
 473         findWireOneWay(aFeature, aFeature, anEndPoint, anEdgesSet, aChain);
 474
 475       std::list<FeaturePtr>::iterator aChainIt = aChain.begin();
 476       for (; aChainIt != aChain.end(); ++aChainIt) {
 477         FeaturePtr aChainFeature = (*aChainIt);
 478         aProcessedSet.insert(aChainFeature);
 479         if (aSelectedSet.find(aChainFeature) == aSelectedSet.end()) {
 480           aSelectedEdges->append(aChainFeature->lastResult());
 481         }
 482       }
 483     }
 484   }
 485   // TODO: hilight selection in the viewer
 486
 487   return true;
 488 }
 489
 490
 491 AISObjectPtr SketchPlugin_Offset::getAISObject(AISObjectPtr thePrevious)
 492 {
 493   if (!sketch())
 494     return thePrevious;
 495
 496   AISObjectPtr anAIS = SketcherPrs_Factory::offsetObject(this, sketch(),
 497     thePrevious);
 498   return anAIS;
 499 }