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 std::shared_ptr<SketchSolver_ConstraintFixed> PlaneGCSSolver_Tools::createMovementConstraint(
 127     FeaturePtr theMovedFeature)
 128 {
 129   return std::shared_ptr<SketchSolver_ConstraintFixed>(
 130       new SketchSolver_ConstraintFixed(theMovedFeature));
 131 }
 132
 133
 134
 135 ConstraintWrapperPtr PlaneGCSSolver_Tools::createConstraint(
 136     ConstraintPtr theConstraint,
 137     const SketchSolver_ConstraintType& theType,
 138     const EntityWrapperPtr& theValue,
 139     const EntityWrapperPtr& thePoint1,
 140     const EntityWrapperPtr& thePoint2,
 141     const EntityWrapperPtr& theEntity1,
 142     const EntityWrapperPtr& theEntity2)
 143 {
 144   ConstraintWrapperPtr aResult;
 145   ScalarWrapperPtr anIntermediate;
 146
 147   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPoint1 = GCS_POINT_WRAPPER(thePoint1);
 148   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPoint2 = GCS_POINT_WRAPPER(thePoint2);
 149
 150   switch (theType) {
 151   case CONSTRAINT_PT_PT_COINCIDENT:
 152     aResult = createConstraintCoincidence(aPoint1, aPoint2);
 153     break;
 154   case CONSTRAINT_PT_ON_LINE:
 155   case CONSTRAINT_PT_ON_CIRCLE:
 156     aResult = createConstraintPointOnEntity(theType, aPoint1, GCS_EDGE_WRAPPER(theEntity1));
 157     break;
 158   case CONSTRAINT_MIDDLE_POINT:
 159     aResult = createConstraintMiddlePoint(aPoint1, GCS_EDGE_WRAPPER(theEntity1));
 160     break;
 161   case CONSTRAINT_PT_PT_DISTANCE:
 162     aResult = createConstraintDistancePointPoint(GCS_SCALAR_WRAPPER(theValue), aPoint1, aPoint2);
 163     break;
 164   case CONSTRAINT_PT_LINE_DISTANCE:
 165     aResult = createConstraintDistancePointLine(GCS_SCALAR_WRAPPER(theValue),
 166                                                 aPoint1,
 167                                                 GCS_EDGE_WRAPPER(theEntity1));
 168     break;
 169   case CONSTRAINT_RADIUS:
 170     aResult = createConstraintRadius(GCS_SCALAR_WRAPPER(theValue),
 171                                      GCS_EDGE_WRAPPER(theEntity1));
 172     break;
 173   case CONSTRAINT_ANGLE:
 174     aResult = createConstraintAngle(theConstraint,
 175                   GCS_SCALAR_WRAPPER(theValue),
 176                   GCS_EDGE_WRAPPER(theEntity1), GCS_EDGE_WRAPPER(theEntity2));
 177     break;
 178   case CONSTRAINT_FIXED:
 179     break;
 180   case CONSTRAINT_HORIZONTAL:
 181   case CONSTRAINT_VERTICAL:
 182     aResult = createConstraintHorizVert(theType, GCS_EDGE_WRAPPER(theEntity1));
 183     break;
 184   case CONSTRAINT_PARALLEL:
 185     aResult = createConstraintParallel(GCS_EDGE_WRAPPER(theEntity1),
 186                                        GCS_EDGE_WRAPPER(theEntity2));
 187     break;
 188   case CONSTRAINT_PERPENDICULAR:
 189     aResult = createConstraintPerpendicular(GCS_EDGE_WRAPPER(theEntity1),
 190                                             GCS_EDGE_WRAPPER(theEntity2));
 191     break;
 192   case CONSTRAINT_EQUAL_LINES:
 193     anIntermediate = GCS_SCALAR_WRAPPER(theValue); // parameter is used to store length of lines
 194   case CONSTRAINT_EQUAL_LINE_ARC:
 195   case CONSTRAINT_EQUAL_RADIUS:
 196     aResult = createConstraintEqual(theType,
 197                                     GCS_EDGE_WRAPPER(theEntity1),
 198                                     GCS_EDGE_WRAPPER(theEntity2),
 199                                     anIntermediate);
 200     break;
 201   default:
 202     break;
 203   }
 204
 205   return aResult;
 206 }
 207
 208 std::shared_ptr<GeomAPI_Pnt2d> PlaneGCSSolver_Tools::point(EntityWrapperPtr theEntity)
 209 {
 210   if (theEntity->type() != ENTITY_POINT)
 211     return std::shared_ptr<GeomAPI_Pnt2d>();
 212
 213   std::shared_ptr<PlaneGCSSolver_PointWrapper> aPointWrapper =
 214       std::dynamic_pointer_cast<PlaneGCSSolver_PointWrapper>(theEntity);
 215   const GCSPointPtr& aPoint = aPointWrapper->point();
 216   return std::shared_ptr<GeomAPI_Pnt2d>(new GeomAPI_Pnt2d(*aPoint->x, *aPoint->y));
 217 }
 218
 219 std::shared_ptr<GeomAPI_Lin2d> PlaneGCSSolver_Tools::line(EntityWrapperPtr theEntity)
 220 {
 221   if (theEntity->type() != ENTITY_LINE)
 222     return std::shared_ptr<GeomAPI_Lin2d>();
 223
 224   std::shared_ptr<PlaneGCSSolver_EdgeWrapper> anEntity =
 225       std::dynamic_pointer_cast<PlaneGCSSolver_EdgeWrapper>(theEntity);
 226   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(anEntity->entity());
 227   return std::shared_ptr<GeomAPI_Lin2d>(
 228       new GeomAPI_Lin2d(*(aLine->p1.x), *(aLine->p1.y), *(aLine->p2.x), *(aLine->p2.y)));
 229 }
 230
 231 std::shared_ptr<GeomAPI_Lin2d> PlaneGCSSolver_Tools::line(FeaturePtr theFeature)
 232 {
 233   if (theFeature->getKind() != SketchPlugin_Line::ID())
 234     return std::shared_ptr<GeomAPI_Lin2d>();
 235
 236   AttributePoint2DPtr aStart = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 237       theFeature->attribute(SketchPlugin_Line::START_ID()));
 238   AttributePoint2DPtr aEnd = std::dynamic_pointer_cast<GeomDataAPI_Point2D>(
 239       theFeature->attribute(SketchPlugin_Line::END_ID()));
 240
 241   return std::shared_ptr<GeomAPI_Lin2d>(new GeomAPI_Lin2d(aStart->pnt(), aEnd->pnt()));
 242 }
 243
 244
 245
 246
 247
 248 // ================   Auxiliary functions   ==========================
 249 ConstraintWrapperPtr createConstraintCoincidence(
 250     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint1,
 251     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint2)
 252 {
 253   GCSPointPtr aPoint1 = thePoint1->point();
 254   GCSPointPtr aPoint2 = thePoint2->point();
 255
 256   // Create equality constraint for corresponding attributes of the points
 257   std::list<GCSConstraintPtr> aConstrList;
 258   aConstrList.push_back(
 259       GCSConstraintPtr(new GCS::ConstraintEqual(aPoint1->x, aPoint2->x)));
 260   aConstrList.push_back(
 261       GCSConstraintPtr(new GCS::ConstraintEqual(aPoint1->y, aPoint2->y)));
 262
 263   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(
 264       aConstrList, CONSTRAINT_PT_PT_COINCIDENT));
 265 }
 266
 267 ConstraintWrapperPtr createConstraintPointOnEntity(
 268     const SketchSolver_ConstraintType& theType,
 269     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
 270     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 271 {
 272   GCSConstraintPtr aNewConstr;
 273
 274   switch (theEntity->type()) {
 275   case ENTITY_LINE: {
 276     std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 277     aNewConstr = GCSConstraintPtr(new GCS::ConstraintPointOnLine(*(thePoint->point()), *aLine));
 278     break;
 279     }
 280   case ENTITY_ARC:
 281   case ENTITY_CIRCLE: {
 282     std::shared_ptr<GCS::Circle> aCirc =
 283       std::dynamic_pointer_cast<GCS::Circle>(theEntity->entity());
 284     aNewConstr = GCSConstraintPtr(
 285         new GCS::ConstraintP2PDistance(*(thePoint->point()), aCirc->center, aCirc->rad));
 286     break;
 287     }
 288   default:
 289     return ConstraintWrapperPtr();
 290   }
 291
 292   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(aNewConstr, theType));
 293 }
 294
 295 ConstraintWrapperPtr createConstraintMiddlePoint(
 296     std::shared_ptr<PlaneGCSSolver_PointWrapper> thePoint,
 297     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 298 {
 299   GCSPointPtr aPoint = thePoint->point();
 300   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 301   if (!aLine)
 302     return ConstraintWrapperPtr();
 303
 304   std::list<GCSConstraintPtr> aConstrList;
 305   aConstrList.push_back(
 306       GCSConstraintPtr(new GCS::ConstraintPointOnPerpBisector(*aPoint, aLine->p1, aLine->p2)));
 307   aConstrList.push_back(GCSConstraintPtr(new GCS::ConstraintPointOnLine(*aPoint, *aLine)));
 308
 309   return ConstraintWrapperPtr(
 310       new PlaneGCSSolver_ConstraintWrapper(aConstrList, CONSTRAINT_MIDDLE_POINT));
 311 }
 312
 313
 314 ConstraintWrapperPtr createConstraintDistancePointPoint(
 315     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 316     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint1,
 317     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint2)
 318 {
 319   GCSConstraintPtr aNewConstr(new GCS::ConstraintP2PDistance(
 320       *(thePoint1->point()), *(thePoint2->point()), theValue->scalar()));
 321   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 322       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PT_PT_DISTANCE));
 323   aResult->setValueParameter(theValue);
 324   return aResult;
 325 }
 326
 327 ConstraintWrapperPtr createConstraintDistancePointLine(
 328     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 329     std::shared_ptr<PlaneGCSSolver_PointWrapper>  thePoint,
 330     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 331 {
 332   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 333   GCSConstraintPtr aNewConstr(new GCS::ConstraintP2LDistance(
 334       *(thePoint->point()), *(aLine), theValue->scalar()));
 335   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 336       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PT_LINE_DISTANCE));
 337   aResult->setValueParameter(theValue);
 338   return aResult;
 339 }
 340
 341 ConstraintWrapperPtr createConstraintRadius(
 342     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 343     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 344 {
 345   std::shared_ptr<GCS::Circle> aCircle =
 346     std::dynamic_pointer_cast<GCS::Circle>(theEntity->entity());
 347   GCSConstraintPtr aNewConstr(new GCS::ConstraintEqual(aCircle->rad, theValue->scalar()));
 348   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 349       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_RADIUS));
 350   aResult->setValueParameter(theValue);
 351   return aResult;
 352 }
 353
 354 ConstraintWrapperPtr createConstraintAngle(
 355     ConstraintPtr theConstraint,
 356     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theValue,
 357     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 358     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 359 {
 360   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 361   bool isLine1Rev = theConstraint->boolean(
 362       SketchPlugin_ConstraintAngle::ANGLE_REVERSED_FIRST_LINE_ID())->value();
 363   GCS::Point aLine1Pt1 = isLine1Rev ? aLine1->p2 : aLine1->p1;
 364   GCS::Point aLine1Pt2 = isLine1Rev ? aLine1->p1 : aLine1->p2;
 365
 366   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 367   bool isLine2Rev = theConstraint->boolean(
 368       SketchPlugin_ConstraintAngle::ANGLE_REVERSED_SECOND_LINE_ID())->value();
 369   GCS::Point aLine2Pt1 = isLine2Rev ? aLine2->p2 : aLine2->p1;
 370   GCS::Point aLine2Pt2 = isLine2Rev ? aLine2->p1 : aLine2->p2;
 371
 372   GCSConstraintPtr aNewConstr(new GCS::ConstraintL2LAngle(
 373       aLine1Pt1, aLine1Pt2, aLine2Pt1, aLine2Pt2, theValue->scalar()));
 374
 375   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 376       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_ANGLE));
 377   aResult->setValueParameter(theValue);
 378   return aResult;
 379 }
 380
 381 ConstraintWrapperPtr createConstraintHorizVert(
 382     const SketchSolver_ConstraintType& theType,
 383     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity)
 384 {
 385   std::shared_ptr<GCS::Line> aLine = std::dynamic_pointer_cast<GCS::Line>(theEntity->entity());
 386   GCSConstraintPtr aNewConstr;
 387   if (theType == CONSTRAINT_HORIZONTAL)
 388     aNewConstr = GCSConstraintPtr(new GCS::ConstraintEqual(aLine->p1.y, aLine->p2.y));
 389   else
 390     aNewConstr = GCSConstraintPtr(new GCS::ConstraintEqual(aLine->p1.x, aLine->p2.x));
 391
 392   return ConstraintWrapperPtr(new PlaneGCSSolver_ConstraintWrapper(aNewConstr, theType));
 393 }
 394
 395 ConstraintWrapperPtr createConstraintParallel(
 396     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 397     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 398 {
 399   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 400   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 401   GCSConstraintPtr aNewConstr(new GCS::ConstraintParallel(*(aLine1), *(aLine2)));
 402
 403   return ConstraintWrapperPtr(
 404       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PARALLEL));
 405 }
 406
 407 ConstraintWrapperPtr createConstraintPerpendicular(
 408     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 409     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2)
 410 {
 411   std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 412   std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 413   GCSConstraintPtr aNewConstr(new GCS::ConstraintPerpendicular(*(aLine1), *(aLine2)));
 414
 415   return ConstraintWrapperPtr(
 416       new PlaneGCSSolver_ConstraintWrapper(aNewConstr, CONSTRAINT_PERPENDICULAR));
 417 }
 418
 419 ConstraintWrapperPtr createConstraintEqual(
 420     const SketchSolver_ConstraintType& theType,
 421     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity1,
 422     std::shared_ptr<PlaneGCSSolver_EdgeWrapper> theEntity2,
 423     std::shared_ptr<PlaneGCSSolver_ScalarWrapper> theIntermed)
 424 {
 425   if (theType == CONSTRAINT_EQUAL_LINE_ARC)
 426     return ConstraintWrapperPtr(); // line-arc equivalence is not supported yet
 427
 428   std::list<GCSConstraintPtr> aConstrList;
 429   if (theType == CONSTRAINT_EQUAL_LINES) {
 430     std::shared_ptr<GCS::Line> aLine1 = std::dynamic_pointer_cast<GCS::Line>(theEntity1->entity());
 431     std::shared_ptr<GCS::Line> aLine2 = std::dynamic_pointer_cast<GCS::Line>(theEntity2->entity());
 432
 433     aConstrList.push_back(GCSConstraintPtr(
 434         new GCS::ConstraintP2PDistance(aLine1->p1, aLine1->p2, theIntermed->scalar())));
 435     aConstrList.push_back(GCSConstraintPtr(
 436         new GCS::ConstraintP2PDistance(aLine2->p1, aLine2->p2, theIntermed->scalar())));
 437     // update value of intermediate parameter
 438     double x = *aLine1->p1.x - *aLine1->p2.x;
 439     double y = *aLine1->p1.y - *aLine1->p2.y;
 440     double aLen = sqrt(x*x + y*y);
 441     theIntermed->setValue(aLen);
 442   } else {
 443     std::shared_ptr<GCS::Circle> aCirc1 =
 444         std::dynamic_pointer_cast<GCS::Circle>(theEntity1->entity());
 445     std::shared_ptr<GCS::Circle> aCirc2 =
 446         std::dynamic_pointer_cast<GCS::Circle>(theEntity2->entity());
 447
 448     aConstrList.push_back(GCSConstraintPtr(new GCS::ConstraintEqual(aCirc1->rad, aCirc2->rad)));
 449   }
 450
 451   std::shared_ptr<PlaneGCSSolver_ConstraintWrapper> aResult(
 452       new PlaneGCSSolver_ConstraintWrapper(aConstrList, theType));
 453   if (theIntermed)
 454     aResult->setValueParameter(theIntermed);
 455   return aResult;
 456 }