src/SketchSolver/PlaneGCSSolver/PlaneGCSSolver_Tools.cpp

   1 // Copyright (C) 2014-20xx CEA/DEN, EDF R&D
   2
   3 // File:    SketchSolver_Builder.cpp
   4 // Created: 25 Mar 2015
   5 // Author:  Artem ZHIDKOV
   6
   7 #include <PlaneGCSSolver_Tools.h>
   8 #include <PlaneGCSSolver_EdgeWrapper.h>
   9 #include <PlaneGCSSolver_PointWrapper.h>
  10 #include <PlaneGCSSolver_ScalarWrapper.h>
  11 #include <PlaneGCSSolver_ConstraintWrapper.h>
  12
  13 #include <SketchSolver_Constraint.h>
  14 #include <SketchSolver_ConstraintAngle.h>
  15 #include <SketchSolver_ConstraintCoincidence.h>
  16 #include <SketchSolver_ConstraintCollinear.h>
  17 #include <SketchSolver_ConstraintDistance.h>
  18 #include <SketchSolver_ConstraintEqual.h>
  19 #include <SketchSolver_ConstraintFixed.h>
  20 #include <SketchSolver_ConstraintLength.h>
  21 #include <SketchSolver_ConstraintMiddle.h>
  22 #include <SketchSolver_ConstraintMirror.h>
  23 #include <SketchSolver_ConstraintTangent.h>
  24 #include <SketchSolver_ConstraintMultiRotation.h>
  25 #include <SketchSolver_ConstraintMultiTranslation.h>
  26
  27 #include <SketchPlugin_ConstraintAngle.h>
  28 #include <SketchPlugin_ConstraintCoincidence.h>
  29 #include <SketchPlugin_ConstraintCollinear.h>
  30 #include <SketchPlugin_ConstraintDistance.h>
  31 #include <SketchPlugin_ConstraintEqual.h>
  32 #include <SketchPlugin_ConstraintLength.h>
  33 #include <SketchPlugin_ConstraintMiddle.h>
  34 #include <SketchPlugin_ConstraintMirror.h>
  35 #include <SketchPlugin_ConstraintRigid.h>
  36 #include <SketchPlugin_ConstraintTangent.h>
  37 #include <SketchPlugin_Line.h>
  38 #include <SketchPlugin_MultiRotation.h>
  39 #include <SketchPlugin_MultiTranslation.h>
  40
  41 #include <cmath>
  42
  43
  44 #define GCS_EDGE_WRAPPER(x)   std::dynamic_pointer_cast<PlaneGCSSolver_EdgeWrapper>(x)
  45 #define GCS_POINT_WRAPPER(x)  std::dynamic_pointer_cast<PlaneGCSSolver_PointWrapper>(x)
  46 #define GCS_SCALAR_WRAPPER(x) std::dynamic_pointer_cast<PlaneGCSSolver_ScalarWrapper>(x)
  47
  48
  49
  50 static ConstraintWrapperPtr
  51   createConstraintCoincidence(std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint1,
  52                               std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint2);
  53 static ConstraintWrapperPtr
  54   createConstraintPointOnEntity(const SketchSolver_ConstraintType& theType,
  55                                 std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
  56                                 std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity);
  57 static ConstraintWrapperPtr
  58   createConstraintDistancePointPoint(std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
  59                                      std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint1,
  60                                      std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint2);
  61 static ConstraintWrapperPtr
  62   createConstraintDistancePointLine(std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
  63                                     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint,
  64                                     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity);
  65 static ConstraintWrapperPtr
  66   createConstraintRadius(std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
  67                          std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity);
  68 static ConstraintWrapperPtr
  69   createConstraintAngle(ConstraintPtr theConstraint,
  70                         std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
  71                         std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
  72                         std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2);
  73 static ConstraintWrapperPtr
  74   createConstraintHorizVert(const SketchSolver_ConstraintType& theType,
  75                             std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity);
  76 static ConstraintWrapperPtr
  77   createConstraintParallel(std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
  78                            std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2);
  79 static ConstraintWrapperPtr
  80   createConstraintPerpendicular(std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
  81                                 std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2);
  82 static ConstraintWrapperPtr
  83   createConstraintEqual(const SketchSolver_ConstraintType& theType,
  84                         std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
  85                         std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2,
  86                         std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theIntermed);
  87 static ConstraintWrapperPtr
  88   createConstraintMiddlePoint(std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
  89                               std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity);
  90
  91
  92
  93
  94
  95 SolverConstraintPtr PlaneGCSSolver_Tools::createConstraint(ConstraintPtr theConstraint)
  96 {
  97   if (theConstraint->getKind() == SketchPlugin_ConstraintCoincidence::ID()) {
  98     return SolverConstraintPtr(new SketchSolver_ConstraintCoincidence(theConstraint));
  99   } else if (theConstraint->getKind() == SketchPlugin_ConstraintCollinear::ID()) {
 100     return SolverConstraintPtr(new SketchSolver_ConstraintCollinear(theConstraint));
 101   } else if (theConstraint->getKind() == SketchPlugin_ConstraintDistance::ID()) {
 102     return SolverConstraintPtr(new SketchSolver_ConstraintDistance(theConstraint));
 103   } else if (theConstraint->getKind() == SketchPlugin_ConstraintEqual::ID()) {
 104     return SolverConstraintPtr(new SketchSolver_ConstraintEqual(theConstraint));
 105   } else if (theConstraint->getKind() == SketchPlugin_ConstraintLength::ID()) {
 106     return SolverConstraintPtr(new SketchSolver_ConstraintLength(theConstraint));
 107   } else if (theConstraint->getKind() == SketchPlugin_ConstraintMiddle::ID()) {
 108     return SolverConstraintPtr(new SketchSolver_ConstraintMiddle(theConstraint));
 109   } else if (theConstraint->getKind() == SketchPlugin_ConstraintMirror::ID()) {
 110     return SolverConstraintPtr(new SketchSolver_ConstraintMirror(theConstraint));
 111   } else if (theConstraint->getKind() == SketchPlugin_ConstraintTangent::ID()) {
 112     return SolverConstraintPtr(new SketchSolver_ConstraintTangent(theConstraint));
 113   } else if (theConstraint->getKind() == SketchPlugin_ConstraintRigid::ID()) {
 114     return SolverConstraintPtr(new SketchSolver_ConstraintFixed(theConstraint));
 115   } else if (theConstraint->getKind() == SketchPlugin_MultiTranslation::ID()) {
 116     return SolverConstraintPtr(new SketchSolver_ConstraintMultiTranslation(theConstraint));
 117   } else if (theConstraint->getKind() == SketchPlugin_MultiRotation::ID()) {
 118     return SolverConstraintPtr(new SketchSolver_ConstraintMultiRotation(theConstraint));
 119   } else if (theConstraint->getKind() == SketchPlugin_ConstraintAngle::ID()) {
 120     return SolverConstraintPtr(new SketchSolver_ConstraintAngle(theConstraint));
 121   }
 122   // All other types of constraints
 123   return SolverConstraintPtr(new SketchSolver_Constraint(theConstraint));
 124 }
 125
 126 SolverConstraintPtr PlaneGCSSolver_Tools::createMovementConstraint(FeaturePtr theMovedFeature)
 127 {
 128   return SolverConstraintPtr(new SketchSolver_ConstraintFixed(theMovedFeature));
 129 }
 130
 131
 132
 133 ConstraintWrapperPtr PlaneGCSSolver_Tools::createConstraint(
 134     ConstraintPtr theConstraint,
 135     const SketchSolver_ConstraintType& theType,
 136     const EntityWrapperPtr& theValue,
 137     const EntityWrapperPtr& thePoint1,
 138     const EntityWrapperPtr& thePoint2,
 139     const EntityWrapperPtr& theEntity1,
 140     const EntityWrapperPtr& theEntity2)
 141 {
 142   ConstraintWrapperPtr aResult;
 143   ScalarWrapperPtr anIntermediate;
 144
 145   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPoint1 = GCS_POINT_WRAPPER(thePoint1);
 146   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPoint2 = GCS_POINT_WRAPPER(thePoint2);
 147
 148   switch (theType) {
 149   case CONSTRAINT_PT_PT_COINCIDENT:
 150     aResult = createConstraintCoincidence(aPoint1, aPoint2);
 151     break;
 152   case CONSTRAINT_PT_ON_LINE:
 153   case CONSTRAINT_PT_ON_CIRCLE:
 154     aResult = createConstraintPointOnEntity(theType, aPoint1, GCS_EDGE_WRAPPER(theEntity1));
 155     break;
 156   case CONSTRAINT_MIDDLE_POINT:
 157     aResult = createConstraintMiddlePoint(aPoint1, GCS_EDGE_WRAPPER(theEntity1));
 158     break;
 159   case CONSTRAINT_PT_PT_DISTANCE:
 160     aResult = createConstraintDistancePointPoint(GCS_SCALAR_WRAPPER(theValue), aPoint1, aPoint2);
 161     break;
 162   case CONSTRAINT_PT_LINE_DISTANCE:
 163     aResult = createConstraintDistancePointLine(GCS_SCALAR_WRAPPER(theValue),
 164                                                 aPoint1,
 165                                                 GCS_EDGE_WRAPPER(theEntity1));
 166     break;
 167   case CONSTRAINT_RADIUS:
 168     aResult = createConstraintRadius(GCS_SCALAR_WRAPPER(theValue),
 169                                      GCS_EDGE_WRAPPER(theEntity1));
 170     break;
 171   case CONSTRAINT_ANGLE:
 172     aResult = createConstraintAngle(theConstraint,
 173                   GCS_SCALAR_WRAPPER(theValue),
 174                   GCS_EDGE_WRAPPER(theEntity1), GCS_EDGE_WRAPPER(theEntity2));
 175     break;
 176   case CONSTRAINT_FIXED:
 177     break;
 178   case CONSTRAINT_HORIZONTAL:
 179   case CONSTRAINT_VERTICAL:
 180     aResult = createConstraintHorizVert(theType, GCS_EDGE_WRAPPER(theEntity1));
 181     break;
 182   case CONSTRAINT_PARALLEL:
 183     aResult = createConstraintParallel(GCS_EDGE_WRAPPER(theEntity1),
 184                                        GCS_EDGE_WRAPPER(theEntity2));
 185     break;
 186   case CONSTRAINT_PERPENDICULAR:
 187     aResult = createConstraintPerpendicular(GCS_EDGE_WRAPPER(theEntity1),
 188                                             GCS_EDGE_WRAPPER(theEntity2));
 189     break;
 190   case CONSTRAINT_EQUAL_LINES:
 191     anIntermediate = GCS_SCALAR_WRAPPER(theValue); // parameter is used to store length of lines
 192   case CONSTRAINT_EQUAL_LINE_ARC:
 193   case CONSTRAINT_EQUAL_RADIUS:
 194     aResult = createConstraintEqual(theType,
 195                                     GCS_EDGE_WRAPPER(theEntity1),
 196                                     GCS_EDGE_WRAPPER(theEntity2),
 197                                     anIntermediate);
 198     break;
 199   default:
 200     break;
 201   }
 202
 203   return aResult;
 204 }
 205
 206 std::shared_ptr<GeomAPI_Pnt2d> PlaneGCSSolver_Tools::point(EntityWrapperPtr theEntity)
 207 {
 208   if (theEntity->type() != ENTITY_POINT)
 209     return std::shared_ptr<GeomAPI_Pnt2d>();
 210
 211   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPointWrapper =
 212       std::dynamic_pointer_cast<PlaneGCSSolver_PointWrapper>(theEntity);
 213   const GCSPointPtr& aPoint = aPointWrapper->point();
 214   return std::shared_ptr<GeomAPI_Pnt2d>(new GeomAPI_Pnt2d(*aPoint->x, *aPoint->y));
 215 }
 216
 217 std::shared_ptr<GeomAPI_Lin2d> PlaneGCSSolver_Tools::line(EntityWrapperPtr theEntity)
 218 {
 219   if (theEntity->type() != ENTITY_LINE)
 220     return std::shared_ptr<GeomAPI_Lin2d>();
 221
 222   std::shared_ptr<PlaneGCSSolver_EdgeWrapper> anEntity =
 223       std::dynamic_pointer_cast<PlaneGCSSolver_EdgeWrapper>(theEntity);
 224   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(anEntity->entity());
 225   return std::shared_ptr<GeomAPI_Lin2d>(
 226       new GeomAPI_Lin2d(*(aLine->p1.x), *(aLine->p1.y), *(aLine->p2.x), *(aLine->p2.y)));
 227 }
 228
 229 std::shared_ptr<GeomAPI_Lin2d> PlaneGCSSolver_Tools::line(FeaturePtr theFeature)
 230 {
 231   if (theFeature->getKind() != SketchPlugin_Line::ID())
 232     return std::shared_ptr<GeomAPI_Lin2d>();
 233
 234   AttributePoint2DPtr aStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 235       theFeature->attribute(SketchPlugin_Line::START_ID()));
 236   AttributePoint2DPtr aEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 237       theFeature->attribute(SketchPlugin_Line::END_ID()));
 238
 239   return std::shared_ptr<GeomAPI_Lin2d>(new GeomAPI_Lin2d(aStart->pnt(), aEnd->pnt()));
 240 }
 241
 242
 243
 244
 245
 246 // ================   Auxiliary functions   ==========================
 247 ConstraintWrapperPtr createConstraintCoincidence(
 248     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint1,
 249     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint2)
 250 {
 251   GCSPointPtr aPoint1 = thePoint1->point();
 252   GCSPointPtr aPoint2 = thePoint2->point();
 253
 254   // Create equality constraint for corresponding attributes of the points
 255   std::list<GCSConstraintPtr> aConstrList;
 256   aConstrList.push_back(
 257       GCSConstraintPtr(new GCS::ConstraintEqual(aPoint1->x, aPoint2->x)));
 258   aConstrList.push_back(
 259       GCSConstraintPtr(new GCS::ConstraintEqual(aPoint1->y, aPoint2->y)));
 260
 261   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(
 262       aConstrList, CONSTRAINT_PT_PT_COINCIDENT));
 263 }
 264
 265 ConstraintWrapperPtr createConstraintPointOnEntity(
 266     const SketchSolver_ConstraintType& theType,
 267     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
 268     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 269 {
 270   GCSConstraintPtr aNewConstr;
 271
 272   switch (theEntity->type()) {
 273   case ENTITY_LINE: {
 274     std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 275     aNewConstr = GCSConstraintPtr(new GCS::ConstraintPointOnLine(*(thePoint->point()), *aLine));
 276     break;
 277     }
 278   case ENTITY_ARC:
 279   case ENTITY_CIRCLE: {
 280     std::shared_ptr<GCS::Circle> aCirc =
 281       std::dynamic_pointer_cast<GCS::Circle>(theEntity->entity());
 282     aNewConstr = GCSConstraintPtr(
 283         new GCS::ConstraintP2PDistance(*(thePoint->point()), aCirc->center, aCirc->rad));
 284     break;
 285     }
 286   default:
 287     return ConstraintWrapperPtr();
 288   }
 289
 290   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(aNewConstr, theType));
 291 }
 292
 293 ConstraintWrapperPtr createConstraintMiddlePoint(
 294     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
 295     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 296 {
 297   GCSPointPtr aPoint = thePoint->point();
 298   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 299   if (!aLine)
 300     return ConstraintWrapperPtr();
 301
 302   std::list<GCSConstraintPtr> aConstrList;
 303   aConstrList.push_back(
 304       GCSConstraintPtr(new GCS::ConstraintPointOnPerpBisector(*aPoint, aLine->p1, aLine->p2)));
 305   aConstrList.push_back(GCSConstraintPtr(new GCS::ConstraintPointOnLine(*aPoint, *aLine)));
 306
 307   return ConstraintWrapperPtr(
 308       new PlaneGCSSolver_ConstraintWrapper(aConstrList, CONSTRAINT_MIDDLE_POINT));
 309 }
 310
 311
 312 ConstraintWrapperPtr createConstraintDistancePointPoint(
 313     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 314     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint1,
 315     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint2)
 316 {
 317   GCSConstraintPtr aNewConstr(new GCS::ConstraintP2PDistance(
 318       *(thePoint1->point()), *(thePoint2->point()), theValue->scalar()));
 319   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 320       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PT_PT_DISTANCE));
 321   aResult->setValueParameter(theValue);
 322   return aResult;
 323 }
 324
 325 ConstraintWrapperPtr createConstraintDistancePointLine(
 326     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 327     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint,
 328     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 329 {
 330   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 331   GCSConstraintPtr aNewConstr(new GCS::ConstraintP2LDistance(
 332       *(thePoint->point()), *(aLine), theValue->scalar()));
 333   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 334       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PT_LINE_DISTANCE));
 335   aResult->setValueParameter(theValue);
 336   return aResult;
 337 }
 338
 339 ConstraintWrapperPtr createConstraintRadius(
 340     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 341     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 342 {
 343   std::shared_ptr<GCS::Circle> aCircle =
 344     std::dynamic_pointer_cast<GCS::Circle>(theEntity->entity());
 345   GCSConstraintPtr aNewConstr(new GCS::ConstraintEqual(aCircle->rad, theValue->scalar()));
 346   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 347       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_RADIUS));
 348   aResult->setValueParameter(theValue);
 349   return aResult;
 350 }
 351
 352 ConstraintWrapperPtr createConstraintAngle(
 353     ConstraintPtr theConstraint,
 354     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 355     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 356     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 357 {
 358   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 359   bool isLine1Rev = theConstraint->boolean(
 360       SketchPlugin_ConstraintAngle::ANGLE_REVERSED_FIRST_LINE_ID())->value();
 361   GCS::Point aLine1Pt1 = isLine1Rev ? aLine1->p2 : aLine1->p1;
 362   GCS::Point aLine1Pt2 = isLine1Rev ? aLine1->p1 : aLine1->p2;
 363
 364   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 365   bool isLine2Rev = theConstraint->boolean(
 366       SketchPlugin_ConstraintAngle::ANGLE_REVERSED_SECOND_LINE_ID())->value();
 367   GCS::Point aLine2Pt1 = isLine2Rev ? aLine2->p2 : aLine2->p1;
 368   GCS::Point aLine2Pt2 = isLine2Rev ? aLine2->p1 : aLine2->p2;
 369
 370   GCSConstraintPtr aNewConstr(new GCS::ConstraintL2LAngle(
 371       aLine1Pt1, aLine1Pt2, aLine2Pt1, aLine2Pt2, theValue->scalar()));
 372
 373   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 374       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_ANGLE));
 375   aResult->setValueParameter(theValue);
 376   return aResult;
 377 }
 378
 379 ConstraintWrapperPtr createConstraintHorizVert(
 380     const SketchSolver_ConstraintType& theType,
 381     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 382 {
 383   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 384   GCSConstraintPtr aNewConstr;
 385   if (theType == CONSTRAINT_HORIZONTAL)
 386     aNewConstr = GCSConstraintPtr(new GCS::ConstraintEqual(aLine->p1.y, aLine->p2.y));
 387   else
 388     aNewConstr = GCSConstraintPtr(new GCS::ConstraintEqual(aLine->p1.x, aLine->p2.x));
 389
 390   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(aNewConstr, theType));
 391 }
 392
 393 ConstraintWrapperPtr createConstraintParallel(
 394     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 395     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 396 {
 397   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 398   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 399   GCSConstraintPtr aNewConstr(new GCS::ConstraintParallel(*(aLine1), *(aLine2)));
 400
 401   return ConstraintWrapperPtr(
 402       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PARALLEL));
 403 }
 404
 405 ConstraintWrapperPtr createConstraintPerpendicular(
 406     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 407     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 408 {
 409   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 410   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 411   GCSConstraintPtr aNewConstr(new GCS::ConstraintPerpendicular(*(aLine1), *(aLine2)));
 412
 413   return ConstraintWrapperPtr(
 414       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PERPENDICULAR));
 415 }
 416
 417 ConstraintWrapperPtr createConstraintEqual(
 418     const SketchSolver_ConstraintType& theType,
 419     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 420     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2,
 421     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theIntermed)
 422 {
 423   if (theType == CONSTRAINT_EQUAL_LINE_ARC)
 424     return ConstraintWrapperPtr(); // line-arc equivalence is not supported yet
 425
 426   std::list<GCSConstraintPtr> aConstrList;
 427   if (theType == CONSTRAINT_EQUAL_LINES) {
 428     std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 429     std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 430
 431     aConstrList.push_back(GCSConstraintPtr(
 432         new GCS::ConstraintP2PDistance(aLine1->p1, aLine1->p2, theIntermed->scalar())));
 433     aConstrList.push_back(GCSConstraintPtr(
 434         new GCS::ConstraintP2PDistance(aLine2->p1, aLine2->p2, theIntermed->scalar())));
 435     // update value of intermediate parameter
 436     double x = *aLine1->p1.x - *aLine1->p2.x;
 437     double y = *aLine1->p1.y - *aLine1->p2.y;
 438     double aLen = sqrt(x*x + y*y);
 439     theIntermed->setValue(aLen);
 440   } else {
 441     std::shared_ptr<GCS::Circle> aCirc1 =
 442         std::dynamic_pointer_cast<GCS::Circle>(theEntity1->entity());
 443     std::shared_ptr<GCS::Circle> aCirc2 =
 444         std::dynamic_pointer_cast<GCS::Circle>(theEntity2->entity());
 445
 446     aConstrList.push_back(GCSConstraintPtr(new GCS::ConstraintEqual(aCirc1->rad, aCirc2->rad)));
 447   }
 448
 449   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 450       new PlaneGCSSolver_ConstraintWrapper(aConstrList, theType));
 451   if (theIntermed)
 452     aResult->setValueParameter(theIntermed);
 453   return aResult;
 454 }