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         myParamBefore = aEndAngle;
 369         adjustPeriod(myParamBefore);
 370       }
 371     }
 372     return;
 373   }
 374   AttributeStringPtr aTypeAttr =
 375       std::dynamic_pointer_cast<ModelAPI_AttributeString>(attribute(ARC_TYPE()));
 376
 377   // this is before others since here end attribute may be changed, but with the special behavior
 378   if (aTypeAttr->value() == ARC_TYPE_TANGENT() && (theID == TANGENT_POINT_ID() || theID == END_ID())) {
 379     SketchPlugin_Sketch* aSketch = sketch();
 380     AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 381         data()->attribute(TANGENT_POINT_ID()));
 382
 383     if (aTangPtAttr->isInitialized() && anEndAttr->isInitialized()) {
 384       // compute orthogonal direction
 385       std::shared_ptr<GeomAPI_Dir2d> anOrthoDir;
 386       std::shared_ptr<GeomDataAPI_Point2D> aTangentPoint =
 387           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(aTangPtAttr->attr());
 388       std::shared_ptr<GeomAPI_Pnt2d> aTangPnt2d = aTangentPoint->pnt();
 389       if (aTangPnt2d->isEqual(anEndAttr->pnt()))
 390         return;
 391       FeaturePtr aTangFeature = ModelAPI_Feature::feature(aTangentPoint->owner());
 392       std::shared_ptr<GeomAPI_Edge> aTangEdge = std::dynamic_pointer_cast<GeomAPI_Edge>(
 393           aTangFeature->lastResult()->shape());
 394       if (aTangEdge->isLine()) {
 395         std::shared_ptr<GeomAPI_Dir> aDir = aTangEdge->line()->direction();
 396         std::shared_ptr<GeomAPI_Pnt> aPnt(new GeomAPI_Pnt(aDir->x(), aDir->y(), aDir->z()));
 397         std::shared_ptr<GeomAPI_Pnt2d> aPnt2d = aSketch->to2D(aPnt);
 398         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(new GeomAPI_Dir2d(-aPnt2d->y(), aPnt2d->x()));
 399       }
 400       else if (aTangEdge->isArc()) {
 401         std::shared_ptr<GeomAPI_Pnt> aCenter = aTangEdge->circle()->center();
 402         std::shared_ptr<GeomAPI_Pnt2d> aCenter2d = aSketch->to2D(aCenter);
 403         anOrthoDir = std::shared_ptr<GeomAPI_Dir2d>(
 404             new GeomAPI_Dir2d(aTangPnt2d->xy()->decreased(aCenter2d->xy())));
 405       }
 406
 407       // compute parameters of the middle perpendicular
 408       std::shared_ptr<GeomAPI_XY> aEndPntCoord = anEndAttr->pnt()->xy();
 409       std::shared_ptr<GeomAPI_XY> aTempDir = aEndPntCoord->decreased(aTangPnt2d->xy());
 410       std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(-aTempDir->y(), aTempDir->x()));
 411       std::shared_ptr<GeomAPI_Pnt2d> aMidPnt(
 412           new GeomAPI_Pnt2d(aEndPntCoord->added(aTangPnt2d->xy())->multiplied(0.5)));
 413
 414       // compute center of arc by calculating intersection of orthogonal line and middle perpendicular
 415       std::shared_ptr<GeomAPI_Lin2d> anOrthoLine(new GeomAPI_Lin2d(aTangPnt2d, anOrthoDir));
 416       std::shared_ptr<GeomAPI_Lin2d> aMiddleLine(new GeomAPI_Lin2d(aMidPnt, aMidDir));
 417       std::shared_ptr<GeomAPI_Pnt2d> aCenter = anOrthoLine->intersect(aMiddleLine);
 418       if (aCenter) {
 419         data()->blockSendAttributeUpdated(true);
 420         aCenterAttr->setValue(aCenter);
 421         aStartAttr->setValue(aTangPnt2d);
 422         data()->blockSendAttributeUpdated(false);
 423       }
 424
 425       tangencyArcConstraints();
 426     }
 427     return;
 428   }
 429
 430   // if changed the base attributes, update all other (is necessary) without recursion
 431   if (theID == CENTER_ID() || theID == START_ID() || theID == END_ID() || theID == ARC_TYPE()) {
 432     if (!isFeatureValid())
 433       return;
 434     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 435     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 436     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 437     double aRadius = aCenter->distance(aStart);
 438     if (aRadius < tolerance)
 439       return;
 440     std::shared_ptr<GeomAPI_Circ2d> aCircleForArc(new GeomAPI_Circ2d(aCenter, aStart));
 441
 442     data()->blockSendAttributeUpdated(true);
 443     if (theID == END_ID() && isStable()) {
 444       // The arc is under construction, so its end point projected
 445       // on the circle formed by center and start points
 446       std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(anEnd);
 447       if (aProjection && anEnd->distance(aProjection) > tolerance) {
 448         anEndAttr->setValue(aProjection);
 449         anEnd = aProjection;
 450       }
 451     }
 452     // update all other attributes due to the base attributes values
 453     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // update passed point due to start, end and center
 454       if (aCenter->distance(aStart) > tolerance && aCenter->distance(anEnd) > tolerance) {
 455         // project passed point t othe circle
 456         std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 457           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 458         if (aPassedAttr->isInitialized()) {
 459           std::shared_ptr<GeomAPI_Pnt2d> aProjection = aCircleForArc->project(aPassedAttr->pnt());
 460           if (aProjection && aPassedAttr->pnt()->distance(aProjection) > tolerance) {
 461             aPassedAttr->setValue(aProjection);
 462           }
 463         } else { // initialize it by some middle - value
 464           std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(
 465             aStart->xy()->decreased(aCenter->xy())));
 466           std::shared_ptr<GeomAPI_Dir2d> aEndDir(new GeomAPI_Dir2d(
 467             anEnd->xy()->decreased(aCenter->xy())));
 468           std::shared_ptr<GeomAPI_XY> aMidDirXY = aStartDir->xy()->added(aEndDir->xy());
 469           if (aMidDirXY->dot(aMidDirXY) < tolerance * tolerance) {
 470             // start and end directions are opposite, so middle direction will be orthogonal
 471             aMidDirXY->setX(-aStartDir->y());
 472             aMidDirXY->setY(aStartDir->x());
 473           }
 474           std::shared_ptr<GeomAPI_Dir2d> aMidDir(new GeomAPI_Dir2d(aMidDirXY));
 475           if ((aStartDir->cross(aMidDir) > 0) ^ !isReversed())
 476             aMidDir->reverse();
 477           std::shared_ptr<GeomAPI_XY> aPassedPnt =
 478             aCenter->xy()->added(aMidDir->xy()->multiplied(aCenter->distance(aStart)));
 479           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()))->
 480             setValue(aPassedPnt->x(), aPassedPnt->y());
 481         }
 482       }
 483     }
 484     // update radius and angle
 485     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 486         data()->attribute(RADIUS_ID()));
 487     aRadiusAttr->setValue(aRadius);
 488     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 489         data()->attribute(ANGLE_ID()));
 490     std::shared_ptr<GeomAPI_Circ2d> aCircle(new GeomAPI_Circ2d(aCenter, aStart));
 491     double aStartParam, aEndParam;
 492     aCircle->parameter(aStart, paramTolerance, aStartParam);
 493     aCircle->parameter(anEnd, paramTolerance, aEndParam);
 494     adjustPeriod(aStartParam);
 495     adjustPeriod(aEndParam);
 496     if (aTypeAttr->value() == ARC_TYPE_THREE_POINTS()) { // use the passed point for the angle calculation
 497       std::shared_ptr<GeomDataAPI_Point2D> aPassedAttr =
 498         std::dynamic_pointer_cast<GeomDataAPI_Point2D>(data()->attribute(PASSED_POINT_ID()));
 499       double aPassedParam;
 500       aCircle->parameter(aPassedAttr->pnt(), paramTolerance, aPassedParam);
 501       adjustPeriod(aPassedParam);
 502       double aNewAngle = aPassedParam >= aStartParam && aPassedParam <= aEndParam ?
 503         ((aEndParam - aStartParam) * 180.0 / PI) :
 504         ((aEndParam - aStartParam - 2.0 * PI) * 180.0 / PI);
 505       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 506         anAngleAttr->setValue(aNewAngle);
 507     } else {
 508       double aNewAngle = (aEndParam - aStartParam) * 180.0 / PI;
 509       if (!anAngleAttr->isInitialized() || fabs(aNewAngle - anAngleAttr->value()) > tolerance)
 510         anAngleAttr->setValue(aNewAngle);
 511     }
 512     // do not need to inform that other parameters were changed in this basis mode: these arguments
 513     // change is enough
 514     data()->blockSendAttributeUpdated(false, false);
 515     return;
 516   }
 517
 518   if (theID == PASSED_POINT_ID()) {
 519     data()->blockSendAttributeUpdated(true);
 520
 521     std::shared_ptr<GeomAPI_Pnt2d> aPoints[3];
 522     int aNbInitialized = 0;
 523     for (int i = 1; i <= 3; ++i) {
 524       std::shared_ptr<GeomDataAPI_Point2D> aCurPnt =
 525           std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(POINT_ID(i)));
 526       if (aCurPnt->isInitialized())
 527         aPoints[aNbInitialized++] = aCurPnt->pnt();
 528     }
 529
 530     if (aNbInitialized == 3) {
 531       std::shared_ptr<GeomAPI_Circ2d> aCircle(
 532           new GeomAPI_Circ2d(aPoints[0], aPoints[1], aPoints[2]));
 533
 534       std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCircle->center();
 535       if (aCenter) {
 536         aCenterAttr->setValue(aCenter);
 537       }
 538     }
 539     data()->blockSendAttributeUpdated(false);
 540     return;
 541   }
 542
 543   if (theID == RADIUS_ID()) {
 544     if (!aStartAttr->isInitialized() || !anEndAttr->isInitialized() || !aCenterAttr->isInitialized())
 545       return;
 546     // move center and passed point
 547     std::shared_ptr<GeomAPI_Pnt2d> aStart = aStartAttr->pnt();
 548     std::shared_ptr<GeomAPI_Pnt2d> anEnd = anEndAttr->pnt();
 549     std::shared_ptr<GeomAPI_Pnt2d> aCenter = aCenterAttr->pnt();
 550     if (aStart->distance(aCenter) < tolerance || anEnd->distance(aCenter) < tolerance)
 551       return;
 552     AttributeDoublePtr aRadiusAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 553         data()->attribute(RADIUS_ID()));
 554     double aRadius = aRadiusAttr->value();
 555
 556     data()->blockSendAttributeUpdated(true);
 557     std::shared_ptr<GeomAPI_Dir2d> aStartDir(new GeomAPI_Dir2d(aStart->xy()->decreased(aCenter->xy())));
 558     std::shared_ptr<GeomAPI_XY> aNewStart = aStartDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 559     aStartAttr->setValue(aNewStart->x(), aNewStart->y());
 560     std::shared_ptr<GeomAPI_Dir2d> anEndDir(new GeomAPI_Dir2d(anEnd->xy()->decreased(aCenter->xy())));
 561     std::shared_ptr<GeomAPI_XY> aNewEnd = anEndDir->xy()->multiplied(aRadius)->added(aCenter->xy());
 562     anEndAttr->setValue(aNewEnd->x(), aNewEnd->y());
 563     data()->blockSendAttributeUpdated(false);
 564     return;
 565   }
 566   if (theID == ANGLE_ID()) {
 567     if (!aStartAttr->isInitialized() || !aCenterAttr->isInitialized())
 568       return;
 569     AttributeDoublePtr anAngleAttr = std::dynamic_pointer_cast<ModelAPI_AttributeDouble>(
 570         data()->attribute(ANGLE_ID()));
 571     data()->blockSendAttributeUpdated(true);
 572     // move end point and passed point
 573     std::shared_ptr<GeomAPI_XY> aCenter = aCenterAttr->pnt()->xy();
 574     double anAngle = anAngleAttr->value() * PI / 180.0;
 575     double sinA = sin(anAngle);
 576     double cosA = cos(anAngle);
 577     std::shared_ptr<GeomAPI_XY> aStartDir = aStartAttr->pnt()->xy()->decreased(aCenter);
 578     std::shared_ptr<GeomAPI_XY> aDir(new GeomAPI_XY(
 579         aStartDir->x() * cosA - aStartDir->y() * sinA,
 580         aStartDir->x() * sinA + aStartDir->y() * cosA));
 581     anEndAttr->setValue(aCenter->x() + aDir->x(), aCenter->y() + aDir->y());
 582     data()->blockSendAttributeUpdated(false);
 583     return;
 584   }
 585 }
 586
 587 void SketchPlugin_Arc::setReversed(bool isReversed)
 588 {
 589   std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->setValue(isReversed);
 590   myParamBefore = 0.0;
 591 }
 592
 593 bool SketchPlugin_Arc::isReversed()
 594 {
 595   return std::dynamic_pointer_cast<ModelAPI_AttributeBoolean>(attribute(INVERSED_ID()))->value();
 596 }
 597
 598 void SketchPlugin_Arc::tangencyArcConstraints()
 599 {
 600   if (!lastResult())
 601     return;
 602
 603   std::shared_ptr<GeomDataAPI_Point2D> aStartAttr =
 604       std::dynamic_pointer_cast<GeomDataAPI_Point2D>(attribute(START_ID()));
 605   AttributeRefAttrPtr aTangPtAttr = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 606       attribute(TANGENT_POINT_ID()));
 607   if (!aTangPtAttr->attr())
 608     return;
 609
 610   FeaturePtr aFeature = ModelAPI_Feature::feature(aStartAttr->owner());
 611   ObjectPtr aThisArc = aFeature->lastResult();
 612   aFeature = ModelAPI_Feature::feature(aTangPtAttr->attr()->owner());
 613   ObjectPtr aTangFeature = aFeature->lastResult();
 614
 615   // trying to find constraints to fix the tangency of the arc
 616   std::set<FeaturePtr> aCoincidence;
 617   std::set<FeaturePtr> aTangency;
 618
 619   AttributeRefAttrPtr aRefAttrA, aRefAttrB;
 620   std::set<AttributePtr> aRefs = data()->refsToMe();
 621   const std::set<AttributePtr>& aRefsToResult = lastResult()->data()->refsToMe();
 622   aRefs.insert(aRefsToResult.begin(), aRefsToResult.end());
 623   std::set<AttributePtr>::const_iterator aRefIt = aRefs.begin();
 624   for (; aRefIt != aRefs.end(); ++aRefIt) {
 625     FeaturePtr aConstrFeature = ModelAPI_Feature::feature((*aRefIt)->owner());
 626     if (aConstrFeature->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
 627       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 628           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 629       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 630           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 631       if ((aRefAttrA && aRefAttrA->attr() == aStartAttr) ||
 632           (aRefAttrB && aRefAttrB->attr() == aStartAttr))
 633         aCoincidence.insert(aConstrFeature);
 634     }
 635     else if (aConstrFeature->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 636       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 637           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_A()));
 638       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 639           aConstrFeature->attribute(SketchPlugin_Constraint::ENTITY_B()));
 640       if ((aRefAttrA && aRefAttrA->object() == aThisArc) ||
 641           (aRefAttrB && aRefAttrB->object() == aThisArc))
 642         aTangency.insert(aConstrFeature);
 643     }
 644   }
 645   // search applicable pair of constraints
 646   bool isFound = false;
 647   FeaturePtr aPrevCoincidence, aPrevTangency;
 648   std::set<FeaturePtr>::const_iterator aCIt, aTIt;
 649   for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end() && !isFound; ++aCIt) {
 650     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 651         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 652     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 653         (*aCIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 654     AttributePtr anOtherPoint =
 655         aRefAttrA->attr() == aStartAttr ? aRefAttrB->attr() : aRefAttrA->attr();
 656     for (aTIt = aTangency.begin(); aTIt != aTangency.end() && !isFound; ++aTIt) {
 657       aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 658           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_A()));
 659       aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 660           (*aTIt)->attribute(SketchPlugin_Constraint::ENTITY_B()));
 661       ObjectPtr anOtherObject = aRefAttrA->object() == aThisArc ?
 662           aRefAttrB->object() : aRefAttrA->object();
 663       FeaturePtr anOtherFeature = ModelAPI_Feature::feature(anOtherObject);
 664       if (anOtherPoint->owner() == anOtherFeature) {
 665         isFound = true;
 666         aPrevCoincidence = *aCIt;
 667         aPrevTangency = *aTIt;
 668       }
 669     }
 670   }
 671
 672   if (isFound) {
 673     // update previous constraints
 674     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 675         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_A()));
 676     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 677         aPrevCoincidence->attribute(SketchPlugin_Constraint::ENTITY_B()));
 678     if (aRefAttrA->attr() == aStartAttr)
 679       aRefAttrB->setAttr(aTangPtAttr->attr());
 680     else
 681       aRefAttrA->setAttr(aTangPtAttr->attr());
 682
 683     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 684         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_A()));
 685     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 686         aPrevTangency->attribute(SketchPlugin_Constraint::ENTITY_B()));
 687     if (aRefAttrA->object() == aThisArc)
 688       aRefAttrB->setObject(aTangFeature);
 689     else
 690       aRefAttrA->setObject(aTangFeature);
 691   } else {
 692     // Wait all constraints being removed, then send update events
 693     static Events_ID aDeleteEvent = Events_Loop::eventByName(EVENT_OBJECT_DELETED);
 694     bool isDeleteFlushed = Events_Loop::loop()->isFlushed(aDeleteEvent);
 695     if (isDeleteFlushed)
 696       Events_Loop::loop()->setFlushed(aDeleteEvent, false);
 697     // Remove all obtained constraints which use current arc, because
 698     // there is no information which of them were used to build tangency arc.
 699     DocumentPtr aDoc = sketch()->document();
 700     std::set<FeaturePtr> aFeaturesToBeRemoved;
 701     for (aCIt = aCoincidence.begin(); aCIt != aCoincidence.end(); ++aCIt)
 702       aFeaturesToBeRemoved.insert(*aCIt);
 703     for (aTIt = aTangency.begin(); aTIt != aTangency.end(); ++aTIt)
 704       aFeaturesToBeRemoved.insert(*aTIt);
 705     ModelAPI_Tools::removeFeaturesAndReferences(aFeaturesToBeRemoved);
 706     // Send events to update the sub-features by the solver.
 707     if (isDeleteFlushed)
 708       Events_Loop::loop()->setFlushed(aDeleteEvent, true);
 709     else
 710       Events_Loop::loop()->flush(aDeleteEvent);
 711
 712     // Wait all constraints being created, then send update events
 713     static Events_ID aCreateEvent = Events_Loop::eventByName(EVENT_OBJECT_CREATED);
 714     bool isCreateFlushed = Events_Loop::loop()->isFlushed(aCreateEvent);
 715     if (isCreateFlushed)
 716       Events_Loop::loop()->setFlushed(aCreateEvent, false);
 717
 718     // Create new constraints
 719     FeaturePtr aConstraint = sketch()->addFeature(SketchPlugin_ConstraintCoincidence::ID());
 720     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 721         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 722     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 723         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 724     aRefAttrA->setAttr(aStartAttr);
 725     aRefAttrB->setAttr(aTangPtAttr->attr());
 726     aConstraint->execute();
 727     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 728
 729     aConstraint = sketch()->addFeature(SketchPlugin_ConstraintTangent::ID());
 730     aRefAttrA = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 731         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_A()));
 732     aRefAttrB = std::dynamic_pointer_cast<ModelAPI_AttributeRefAttr>(
 733         aConstraint->attribute(SketchPlugin_Constraint::ENTITY_B()));
 734     aRefAttrA->setObject(aThisArc);
 735     aRefAttrB->setObject(aTangFeature);
 736     aConstraint->execute();
 737     ModelAPI_EventCreator::get()->sendUpdated(aConstraint, aCreateEvent);
 738
 739     // Send events to update the sub-features by the solver.
 740     if(isCreateFlushed)
 741       Events_Loop::loop()->setFlushed(aCreateEvent, true);
 742     else
 743       Events_Loop::loop()->flush(aCreateEvent);
 744   }
 745 }