src/SketchPlugin/SketchPlugin_Arc.cpp

   1 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D -->
   2
   3 // File:        SketchPlugin_Arc.cpp
   4 // Created:     26 Apr 2014
   5 // Author:      Artem ZHIDKOV
   6
   7 #include "SketchPlugin_Arc.h"
   8 #include "SketchPlugin_Sketch.h"
   9 #include <SketchPlugin_ConstraintCoincidence.h>
  10 #include <SketchPlugin_ConstraintTangent.h>
  11
  12 #include <Events_Loop.h>
  13 #include <ModelAPI_Data.h>
  14 #include <ModelAPI_ResultConstruction.h>
  15 #include <ModelAPI_AttributeDouble.h>
  16 #include <ModelAPI_AttributeRefAttr.h>
  17 #include <ModelAPI_AttributeSelection.h>
  18 #include <ModelAPI_AttributeString.h>
  19 #include <ModelAPI_Events.h>
  20 #include <ModelAPI_Validator.h>
  21 #include <ModelAPI_Session.h>
  22 #include <ModelAPI_Tools.h>
  23
  24 #include <GeomAPI_Ax2.h>
  25 #include <GeomAPI_Circ2d.h>
  26 #include <GeomAPI_Circ.h>
  27 #include <GeomAPI_Dir2d.h>
  28 #include <GeomAPI_Dir.h>
  29 #include <GeomAPI_Lin2d.h>
  30 #include <GeomAPI_Lin.h>
  31 #include <GeomAPI_Pnt2d.h>
  32 #include <GeomAPI_Vertex.h>
  33 #include <GeomAPI_XY.h>
  34 #include <GeomDataAPI_Point2D.h>
  35 #include <GeomDataAPI_Dir.h>
  36 #include <GeomAlgoAPI_PointBuilder.h>
  37 #include <GeomAlgoAPI_EdgeBuilder.h>
  38 #include <GeomAlgoAPI_CompoundBuilder.h>
  39 // for sqrt on Linux
  40 #include <math.h>
  41
  42 const double tolerance = 1e-7;
  43 const double paramTolerance = 1.e-4;
  44 const double PI = 3.141592653589793238463;
  45
  46 namespace {
  47   static const std::string& POINT_ID(int theIndex)
  48   {
  49     switch (theIndex) {
  50     case 1: return SketchPlugin_Arc::START_ID();
  51     case 2: return SketchPlugin_Arc::END_ID();
  52     case 3: return SketchPlugin_Arc::PASSED_POINT_ID();
  53     }
  54
  55     static const std::string DUMMY;
  56     return DUMMY;
  57   }
  58 }
  59
  60
  61
  62 SketchPlugin_Arc::SketchPlugin_Arc()
  63     : SketchPlugin_SketchEntity()
  64 {
  65   myStartUpdate = false;
  66   myEndUpdate = false;
  67   // default values
  68   myXEndBefore = 0;
  69   myYEndBefore = 0;
  70
  71   myParamBefore = PI * 2.0;
  72 }
  73
  74 void SketchPlugin_Arc::initDerivedClassAttributes()
  75 {
  76   data()->addAttribute(CENTER_ID(), GeomDataAPI_Point2D::typeId());
  77   data()->addAttribute(START_ID(), GeomDataAPI_Point2D::typeId());
  78   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
  79     GeomDataAPI_Point2D>(data()->addAttribute(END_ID(), GeomDataAPI_Point2D::typeId()));
  80   data()->addAttribute(EXTERNAL_ID(), ModelAPI_AttributeSelection::typeId());
  81   ModelAPI_Session::get()->validators()->registerNotObligatory(getKind(), EXTERNAL_ID());
  82
  83   AttributeBooleanPtr isInversed = std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(
  84     data()->addAttribute(INVERSED_ID(), ModelAPI_AttributeBoolean::typeId()));
  85
  86   // get the initial values
  87   if (anEndAttr->isInitialized()) {
  88     myXEndBefore = anEndAttr->x();
  89     myYEndBefore = anEndAttr->y();
  90   }
  91
  92   AttributeStringPtr anArcType = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
  93     data()->addAttribute(ARC_TYPE(), ModelAPI_AttributeString::typeId()));
  94
  95   data()->addAttribute(PASSED_POINT_ID(), GeomDataAPI_Point2D::typeId());
  96   data()->addAttribute(TANGENT_POINT_ID(), ModelAPI_AttributeRefAttr::typeId());
  97   data()->addAttribute(RADIUS_ID(), ModelAPI_AttributeDouble::typeId());
  98   data()->addAttribute(ANGLE_ID(), ModelAPI_AttributeDouble::typeId());
  99
 100   // set after all to avoid in attributeChanged reference to not existing attributes
 101   if (!isInversed->isInitialized())
 102     isInversed->setValue(false);
 103   anArcType->setValue(ARC_TYPE_CENTER_START_END());
 104 }
 105
 106 void SketchPlugin_Arc::execute()
 107 {
 108   SketchPlugin_Sketch* aSketch = sketch();
 109   // result for the arc is set only when all obligatory attributes are initialized,
 110   // otherwise AIS object is used to visualize the arc's preview
 111   if (aSketch && isFeatureValid()) {
 112     bool hasResult = lastResult().get() != NULL;
 113
 114     // compute a circle point in 3D view
 115     std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 116         GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 117     // compute the arc start point
 118     std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 119         GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 120
 121     std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 122     // make a visible point
 123     std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::vertex(aCenter);
 124     std::shared_ptr<ModelAPI_ResultConstruction> aConstr1 = document()->createConstruction(
 125         data(), 0);
 126     aConstr1->setShape(aCenterPointShape);
 127     aConstr1->setIsInHistory(false);
 128     setResult(aConstr1, 0);
 129
 130     // make a visible circle
 131     std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 132         aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 133     std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 134     std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 135
 136     // compute and change the arc end point
 137     std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 138         GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 139     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(
 140         new GeomAPI_Circ2d(aCenterAttr->pnt(), aStartAttr->pnt()));
 141     std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEndAttr->pnt());
 142     if (aProjection && anEndAttr->pnt()->distance(aProjection) > tolerance)
 143       anEndAttr->setValue(aProjection);
 144     std::shared_ptr<GeomAPI_Pnt> aEndPoint(aSketch->to3D(anEndAttr->x(), anEndAttr->y()));
 145     AttributeBooleanPtr isInversed =
 146         std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 147
 148     std::shared_ptr<GeomAPI_Dir> anXDir(new GeomAPI_Dir(aStartPoint->xyz()->decreased(aCenter->xyz())));
 149     std::shared_ptr<GeomAPI_Ax2> anAx2(new GeomAPI_Ax2(aCenter, aNormal, anXDir));
 150     std::shared_ptr<GeomAPI_Circ> aCirc(new GeomAPI_Circ(anAx2, aCenter->distance(aStartPoint)));
 151     double aParameterNew = 0.0;
 152     if(aCirc->parameter(aEndPoint, paramTolerance, aParameterNew)) {
 153       if(0 <= myParamBefore && myParamBefore <= PI / 2.0
 154         && PI * 1.5 <= aParameterNew && aParameterNew <= PI * 2.0) {
 155           isInversed->setValue(true);
 156       } else if(PI * 1.5 <= myParamBefore && myParamBefore <= PI * 2.0
 157         && 0 <= aParameterNew && aParameterNew <= PI / 2.0) {
 158           isInversed->setValue(false);
 159       }
 160     }
 161     myParamBefore = aParameterNew;
 162
 163     std::shared_ptr<GeomAPI_Shape> aCircleShape;
 164     if(!isInversed->value()) {
 165       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 166     } else {
 167       aCircleShape = GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal);
 168     }
 169
 170     if (aCircleShape) {
 171       std::shared_ptr<ModelAPI_ResultConstruction> aConstr2 = document()->createConstruction(
 172           data(), 1);
 173       aConstr2->setShape(aCircleShape);
 174       aConstr2->setIsInHistory(false);
 175       setResult(aConstr2, 1);
 176     }
 177   }
 178 }
 179
 180 AISObjectPtr SketchPlugin_Arc::getAISObject(AISObjectPtr thePrevious)
 181 {
 182   SketchPlugin_Sketch* aSketch = sketch();
 183   if (aSketch) {
 184     // if the feature is valid, the execute() method should be performed, AIS object is empty
 185     if (!isFeatureValid()) {
 186       // compute a circle point in 3D view
 187       std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 188           GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 189
 190       std::list<std::shared_ptr<GeomAPI_Shape> > aShapes;
 191       if (aCenterAttr->isInitialized()) {
 192         std::shared_ptr<GeomAPI_Pnt> aCenter(aSketch->to3D(aCenterAttr->x(), aCenterAttr->y()));
 193
 194         std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 195             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 196         std::shared_ptr<GeomDataAPI_Point2D> aEndAttr = std::dynamic_pointer_cast<
 197             GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 198         AttributeStringPtr aTypeAttr = std::dynamic_pointer_cast<ModelAPI_AttributeString>(
 199             data()->attribute(ARC_TYPE()));
 200
 201         if (aStartAttr->isInitialized()) {
 202           // make a visible circle
 203           std::shared_ptr<GeomDataAPI_Dir> aNDir = std::dynamic_pointer_cast<GeomDataAPI_Dir>(
 204               aSketch->data()->attribute(SketchPlugin_Sketch::NORM_ID()));
 205           bool aHasPlane = aNDir && !(aNDir->x() == 0 && aNDir->y() == 0 && aNDir->z() == 0);
 206           if (aHasPlane) {
 207             std::shared_ptr<GeomAPI_Dir> aNormal = aNDir->dir();
 208             std::shared_ptr<GeomAPI_Pnt> aStartPoint(aSketch->to3D(aStartAttr->x(), aStartAttr->y()));
 209             std::shared_ptr<GeomAPI_Pnt> aEndPoint = aStartPoint;
 210             if (aTypeAttr && aTypeAttr->isInitialized() &&
 211                 aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) {
 212               if (aEndAttr->isInitialized() && //
 213                   aEndAttr->pnt()->distance(aStartAttr->pnt()) > tolerance) {
 214                 aEndPoint = aSketch->to3D(aEndAttr->x(), aEndAttr->y());
 215                 std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 216                   std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 217                 if (!aPassedAttr->isInitialized()) { // calculate the appropriate center for the presentation
 218                   // check that center is bad for the current start and end and must be recomputed
 219                   std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(
 220                     aCenterAttr->pnt(), aStartAttr->pnt()));
 221                   std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aEndAttr->pnt());
 222                   if (!aProjection.get() || aEndAttr->pnt()->distance(aProjection) > tolerance) {
 223                     std::shared_ptr<GeomAPI_XY> aDir =
 224                       aEndAttr->pnt()->xy()->decreased(aStartAttr->pnt()->xy())->multiplied(0.5);
 225                     double x = aDir->x();
 226                     double y = aDir->y();
 227                     aDir->setX(x - y);
 228                     aDir->setY(y + x);
 229                     std::shared_ptr<GeomAPI_XY> aCenterXY = aStartAttr->pnt()->xy()->added(aDir);
 230                     aCenter = aSketch->to3D(aCenterXY->x(), aCenterXY->y());
 231                   }
 232                 }
 233               } else { // issue #1695: don't display circle if initialized only start point
 234                 return AISObjectPtr();
 235               }
 236             }
 237             AttributeBooleanPtr isInversed =
 238               std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()));
 239
 240             std::shared_ptr<GeomAPI_Shape> aCircleShape =
 241               (isInversed->isInitialized() && isInversed->value()) ?
 242                 GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aEndPoint, aStartPoint, aNormal) :
 243                 GeomAlgoAPI_EdgeBuilder::lineCircleArc(aCenter, aStartPoint, aEndPoint, aNormal);
 244
 245             if (aCircleShape)
 246               aShapes.push_back(aCircleShape);
 247           }
 248         }
 249         // make a visible point
 250         std::shared_ptr<GeomAPI_Shape> aCenterPointShape = GeomAlgoAPI_PointBuilder::vertex(aCenter);
 251         aShapes.push_back(aCenterPointShape);
 252       }
 253       if (!aShapes.empty()) {
 254         std::shared_ptr<GeomAPI_Shape> aCompound = GeomAlgoAPI_CompoundBuilder::compound(aShapes);
 255         AISObjectPtr anAIS = thePrevious;
 256         if (!anAIS)
 257           anAIS = AISObjectPtr(new GeomAPI_AISObject);
 258         anAIS->createShape(aCompound);
 259         anAIS->setWidth(3);
 260         return anAIS;
 261       }
 262     }
 263   }
 264   return AISObjectPtr();
 265 }
 266
 267 void SketchPlugin_Arc::move(double theDeltaX, double theDeltaY)
 268 {
 269   std::shared_ptr<ModelAPI_Data> aData = data();
 270   if (!aData->isValid())
 271     return;
 272
 273   aData->blockSendAttributeUpdated(true);
 274
 275   myStartUpdate = true;
 276   myEndUpdate = true;
 277   std::shared_ptr<GeomDataAPI_Point2D> aPoint2 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 278       aData->attribute(SketchPlugin_Arc::START_ID()));
 279   if (aPoint2->isInitialized())
 280     aPoint2->move(theDeltaX, theDeltaY);
 281
 282   std::shared_ptr<GeomDataAPI_Point2D> aPoint3 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 283       aData->attribute(SketchPlugin_Arc::END_ID()));
 284   if (aPoint3->isInitialized())
 285     aPoint3->move(theDeltaX, theDeltaY);
 286   myStartUpdate = false;
 287   myEndUpdate = false;
 288
 289   std::shared_ptr<GeomDataAPI_Point2D> aPoint1 = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 290       aData->attribute(SketchPlugin_Arc::CENTER_ID()));
 291   if (aPoint1->isInitialized())
 292     aPoint1->move(theDeltaX, theDeltaY);
 293
 294   std::shared_ptr<GeomDataAPI_Point2D> aPassedPoint =
 295       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aData->attribute(PASSED_POINT_ID()));
 296   if (aPassedPoint->isInitialized())
 297     aPassedPoint->move(theDeltaX, theDeltaY);
 298   aData->blockSendAttributeUpdated(false);
 299 }
 300
 301 bool SketchPlugin_Arc::isFixed() {
 302   return data()->selection(EXTERNAL_ID())->context().get() != NULL;
 303 }
 304
 305 bool SketchPlugin_Arc::isFeatureValid()
 306 {
 307   AttributeStringPtr anArcTypeAttr =
 308       std::dynamic_pointer_cast<ModelAPI_AttributeString>(data()->attribute(ARC_TYPE()));
 309   if (!anArcTypeAttr)
 310     return false;
 311   std::string anArcType = anArcTypeAttr->value();
 312
 313   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 314       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::CENTER_ID()));
 315   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 316       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::START_ID()));
 317   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 318       GeomDataAPI_Point2D>(data()->attribute(SketchPlugin_Arc::END_ID()));
 319   std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr = std::dynamic_pointer_cast<
 320       GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 321
 322   bool isValid = false;
 323   if (anArcType == ARC_TYPE_THREE_POINTS())
 324     isValid = aStartAttr->isInitialized() && anEndAttr->isInitialized() && aPassedAttr->isInitialized();
 325   else
 326     isValid = aCenterAttr->isInitialized() && aStartAttr->isInitialized() && anEndAttr->isInitialized();
 327
 328   return isValid;
 329 }
 330
 331 static inline void adjustPeriod(double& theParam)
 332 {
 333   static const double PERIOD = 2.0 * PI;
 334   while (theParam < 0.0) theParam += PERIOD;
 335   while (theParam >= PERIOD) theParam -= PERIOD;
 336 }
 337
 338 void SketchPlugin_Arc::attributeChanged(const std::string& theID)
 339 {
 340   std::shared_ptr<GeomDataAPI_Point2D> aCenterAttr = std::dynamic_pointer_cast<
 341       GeomDataAPI_Point2D>(data()->attribute(CENTER_ID()));
 342   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr = std::dynamic_pointer_cast<
 343       GeomDataAPI_Point2D>(data()->attribute(START_ID()));
 344   std::shared_ptr<GeomDataAPI_Point2D> anEndAttr = std::dynamic_pointer_cast<
 345       GeomDataAPI_Point2D>(data()->attribute(END_ID()));
 346   // the second condition for unability to move external segments anywhere
 347   if (theID == EXTERNAL_ID() || isFixed()) {
 348     std::shared_ptr<GeomAPI_Shape> aSelection = data()->selection(EXTERNAL_ID())->value();
 349     if (!aSelection) {
 350       // empty shape in selection shows that the shape is equal to context
 351       ResultPtr anExtRes = selection(EXTERNAL_ID())->context();
 352       if (anExtRes)
 353         aSelection = anExtRes->shape();
 354     }
 355     // update arguments due to the selection value
 356     if (aSelection && !aSelection->isNull() && aSelection->isEdge()) {
 357       std::shared_ptr<GeomAPI_Edge> anEdge( new GeomAPI_Edge(aSelection));
 358       std::shared_ptr<GeomAPI_Circ> aCirc = anEdge->circle();
 359       if (aCirc.get()) {
 360         aStartAttr->setValue(sketch()->to2D(anEdge->firstPoint()));
 361         anEndAttr->setValue(sketch()->to2D(anEdge->lastPoint()));
 362         aCenterAttr->setValue(sketch()->to2D(aCirc->center()));
 363
 364         data()->real(RADIUS_ID())->setValue(aCirc->radius());
 365         double aStartAngle, aEndAngle;
 366         anEdge->getRange(aStartAngle, aEndAngle);
 367         data()->real(ANGLE_ID())->setValue(aEndAngle - aStartAngle);
 368       }
 369     }
 370     return;
 371   }
 372   AttributeStringPtr aTypeAttr =
 373       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 374
 375   // this is before others since here end attribute may be changed, but with the special behavior
 376   if (aTypeAttr->value() == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
 377     SketchPlugin_Sketch* aSketch = sketch();
 378     AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 379         data()->attribute(TANGENT_POINT_ID()));
 380
 381     if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
 382       // compute orthogonal direction
 383       std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
 384       std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
 385           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
 386       std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
 387       if (aTangPnt2d->isEqual(anEndAttr->pnt()))
 388         return;
 389       FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
 390       std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
 391           aTangFeature->lastResult()->shape());
 392       if (aTangEdge->isLine()) {
 393         std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
 394         std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
 395         std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
 396         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
 397       }
 398       else if (aTangEdge->isArc()) {
 399         std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
 400         std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
 401         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
 402             new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
 403       }
 404
 405       // compute parameters of the middle perpendicular
 406       std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
 407       std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
 408       std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
 409       std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
 410           new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
 411
 412       // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
 413       std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
 414       std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
 415       std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
 416       if (aCenter) {
 417         data()->blockSendAttributeUpdated(true);
 418         aCenterAttr->setValue(aCenter);
 419         aStartAttr->setValue(aTangPnt2d);
 420         data()->blockSendAttributeUpdated(false);
 421       }
 422
 423       tangencyArcConstraints();
 424     }
 425     return;
 426   }
 427
 428   // if changed the base attributes, update all other (is necessary) without recursion
 429   if (theID == CENTER_ID() || theID == START_ID() || theID == END_ID() || theID == ARC_TYPE()) {
 430     if (!isFeatureValid())
 431       return;
 432     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 433     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 434     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 435     double aRadius = aCenter->distance(aStart);
 436     if (aRadius < tolerance)
 437       return;
 438     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(aCenter, aStart));
 439
 440     data()->blockSendAttributeUpdated(true);
 441     if (theID == END_ID() && isStable()) {
 442       // The arc is under construction, so its end point projected
 443       // on the circle formed by center and start points
 444       std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEnd);
 445       if (aProjection && anEnd->distance(aProjection) > tolerance) {
 446         anEndAttr->setValue(aProjection);
 447         anEnd = aProjection;
 448       }
 449     }
 450     // update all other attributes due to the base attributes values
 451     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // update passed point due to start, end and center
 452       if (aCenter->distance(aStart) > tolerance && aCenter->distance(anEnd) > tolerance) {
 453         // project passed point t othe circle
 454         std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 455           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 456         if (aPassedAttr->isInitialized()) {
 457           std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aPassedAttr->pnt());
 458           if (aProjection && aPassedAttr->pnt()->distance(aProjection) > tolerance) {
 459             aPassedAttr->setValue(aProjection);
 460           }
 461         } else { // initialize it by some middle - value
 462           std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 463             aStart->xy()->decreased(aCenter->xy())));
 464           std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 465             anEnd->xy()->decreased(aCenter->xy())));
 466           std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 467           if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 468             // start and end directions are opposite, so middle direction will be orthogonal
 469             aMidDirXY->setX(-aStartDir->y());
 470             aMidDirXY->setY(aStartDir->x());
 471           }
 472           std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 473           if ((aStartDir->cross(aMidDir) > 0) ^ !isReversed())
 474             aMidDir->reverse();
 475           std::shared_ptr<GeomAPI_XY> aPassedPnt =
 476             aCenter->xy()->added(aMidDir->xy()->multiplied(aCenter->distance(aStart)));
 477           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()))->
 478             setValue(aPassedPnt->x(), aPassedPnt->y());
 479         }
 480       }
 481     }
 482     // update radius and angle
 483     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 484         data()->attribute(RADIUS_ID()));
 485     aRadiusAttr->setValue(aRadius);
 486     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 487         data()->attribute(ANGLE_ID()));
 488     std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter, aStart));
 489     double aStartParam, aEndParam;
 490     aCircle->parameter(aStart, paramTolerance, aStartParam);
 491     aCircle->parameter(anEnd, paramTolerance, aEndParam);
 492     adjustPeriod(aStartParam);
 493     adjustPeriod(aEndParam);
 494     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // use the passed point for the angle calculation
 495       std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 496         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 497       double aPassedParam;
 498       aCircle->parameter(aPassedAttr->pnt(), paramTolerance, aPassedParam);
 499       adjustPeriod(aPassedParam);
 500       double aNewAngle = aPassedParam >= aStartParam && aPassedParam <= aEndParam ?
 501         ((aEndParam - aStartParam) * 180.0 / PI) :
 502         ((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 503       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 504         anAngleAttr->setValue(aNewAngle);
 505     } else {
 506       double aNewAngle = (aEndParam - aStartParam) * 180.0 / PI;
 507       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 508         anAngleAttr->setValue(aNewAngle);
 509     }
 510     // do not need to inform that other parameters were changed in this basis mode: these arguments
 511     // change is enough
 512     data()->blockSendAttributeUpdated(false, false);
 513     return;
 514   }
 515
 516   if (theID == PASSED_POINT_ID()) {
 517     data()->blockSendAttributeUpdated(true);
 518
 519     std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
 520     int aNbInitialized = 0;
 521     for (int i = 1; i <= 3; ++i) {
 522       std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
 523           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
 524       if (aCurPnt->isInitialized())
 525         aPoints[aNbInitialized++] = aCurPnt->pnt();
 526     }
 527
 528     if (aNbInitialized == 3) {
 529       std::shared_ptr<GeomAPI_Circ2d> aCircle(
 530           new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
 531
 532       std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
 533       if (aCenter) {
 534         aCenterAttr->setValue(aCenter);
 535       }
 536     }
 537     data()->blockSendAttributeUpdated(false);
 538     return;
 539   }
 540
 541   if (theID == RADIUS_ID()) {
 542     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized() || !aCenterAttr->isInitialized())
 543       return;
 544     // move center and passed point
 545     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 546     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 547     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 548     if (aStart->distance(aCenter) < tolerance || anEnd->distance(aCenter) < tolerance)
 549       return;
 550     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 551         data()->attribute(RADIUS_ID()));
 552     double aRadius = aRadiusAttr->value();
 553
 554     data()->blockSendAttributeUpdated(true);
 555     std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStart->xy()->decreased(aCenter->xy())));
 556     std::shared_ptr<GeomAPI_XY> aNewStart = aStartDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 557     aStartAttr->setValue(aNewStart->x(), aNewStart->y());
 558     std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEnd->xy()->decreased(aCenter->xy())));
 559     std::shared_ptr<GeomAPI_XY> aNewEnd = anEndDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 560     anEndAttr->setValue(aNewEnd->x(), aNewEnd->y());
 561     data()->blockSendAttributeUpdated(false);
 562     return;
 563   }
 564   if (theID == ANGLE_ID()) {
 565     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 566       return;
 567     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 568         data()->attribute(ANGLE_ID()));
 569     data()->blockSendAttributeUpdated(true);
 570     // move end point and passed point
 571     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 572     double anAngle = anAngleAttr->value() * PI / 180.0;
 573     double sinA = sin(anAngle);
 574     double cosA = cos(anAngle);
 575     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 576     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 577         aStartDir->x() * cosA - aStartDir->y() * sinA,
 578         aStartDir->x() * sinA + aStartDir->y() * cosA));
 579     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 580     data()->blockSendAttributeUpdated(false);
 581     return;
 582   }
 583 }
 584
 585 void SketchPlugin_Arc::setReversed(bool isReversed)
 586 {
 587   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 588   myParamBefore = 0.0;
 589 }
 590
 591 bool SketchPlugin_Arc::isReversed()
 592 {
 593   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 594 }
 595
 596 void SketchPlugin_Arc::tangencyArcConstraints()
 597 {
 598   if (!lastResult())
 599     return;
 600
 601   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 602       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 603   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 604       attribute(TANGENT_POINT_ID()));
 605   if (!aTangPtAttr->attr())
 606     return;
 607
 608   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 609   ObjectPtr aThisArc = aFeature->lastResult();
 610   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 611   ObjectPtr aTangFeature = aFeature->lastResult();
 612
 613   // trying to find constraints to fix the tangency of the arc
 614   std::set<FeaturePtr> aCoincidence;
 615   std::set<FeaturePtr> aTangency;
 616
 617   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 618   std::set<AttributePtr> aRefs = data()->refsToMe();
 619   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 620   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 621   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 622   for (; aRefIt != aRefs.end(); ++aRefIt) {
 623     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 624     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 625       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 626           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 627       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 628           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 629       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 630           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 631         aCoincidence.insert(aConstrFeature);
 632     }
 633     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 634       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 635           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 636       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 637           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 638       if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
 639           (aRefAttrB && aRefAttrB->object() == aThisArc))
 640         aTangency.insert(aConstrFeature);
 641     }
 642   }
 643   // search applicable pair of constraints
 644   bool isFound = false;
 645   FeaturePtr aPrevCoincidence, aPrevTangency;
 646   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 647   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 648     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 649         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 650     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 651         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 652     AttributePtr anOtherPoint =
 653         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 654     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 655       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 656           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 657       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 658           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 659       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 660           aRefAttrB->object() : aRefAttrA->object();
 661       FeaturePtr anOtherFeature = ModelAPI_Feature::feature(anOtherObject);
 662       if (anOtherPoint->owner() == anOtherFeature) {
 663         isFound = true;
 664         aPrevCoincidence = *aCIt;
 665         aPrevTangency = *aTIt;
 666       }
 667     }
 668   }
 669
 670   if (isFound) {
 671     // update previous constraints
 672     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 673         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 674     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 675         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 676     if (aRefAttrA->attr() == aStartAttr)
 677       aRefAttrB->setAttr(aTangPtAttr->attr());
 678     else
 679       aRefAttrA->setAttr(aTangPtAttr->attr());
 680
 681     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 682         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 683     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 684         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 685     if (aRefAttrA->object() == aThisArc)
 686       aRefAttrB->setObject(aTangFeature);
 687     else
 688       aRefAttrA->setObject(aTangFeature);
 689   } else {
 690     // Wait all constraints being removed, then send update events
 691     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 692     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 693     if (isDeleteFlushed)
 694       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 695     // Remove all obtained constraints which use current arc, because
 696     // there is no information which of them were used to build tangency arc.
 697     DocumentPtr aDoc = sketch()->document();
 698     std::set<FeaturePtr> aFeaturesToBeRemoved;
 699     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 700       aFeaturesToBeRemoved.insert(*aCIt);
 701     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 702       aFeaturesToBeRemoved.insert(*aTIt);
 703     ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
 704     // Send events to update the sub-features by the solver.
 705     if (isDeleteFlushed)
 706       Events_Loop::loop()->setFlushed(aDeleteEvent, true);
 707     else
 708       Events_Loop::loop()->flush(aDeleteEvent);
 709
 710     // Wait all constraints being created, then send update events
 711     static Events_ID aCreateEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
 712     bool isCreateFlushed = Events_Loop::loop()->isFlushed(aCreateEvent);
 713     if (isCreateFlushed)
 714       Events_Loop::loop()->setFlushed(aCreateEvent, false);
 715
 716     // Create new constraints
 717     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 718     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 719         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 720     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 721         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 722     aRefAttrA->setAttr(aStartAttr);
 723     aRefAttrB->setAttr(aTangPtAttr->attr());
 724     aConstraint->execute();
 725     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 726
 727     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 728     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 729         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 730     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 731         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 732     aRefAttrA->setObject(aThisArc);
 733     aRefAttrB->setObject(aTangFeature);
 734     aConstraint->execute();
 735     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 736
 737     // Send events to update the sub-features by the solver.
 738     if(isCreateFlushed)
 739       Events_Loop::loop()->setFlushed(aCreateEvent, true);
 740     else
 741       Events_Loop::loop()->flush(aCreateEvent);
 742   }
 743 }