/[escript]/trunk/pycad/py_src/primitives.py
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revision 929 by gross, Wed Jan 17 07:41:13 2007 UTC revision 930 by gross, Thu Jan 18 08:12:58 2007 UTC
# Line 169  class PrimitiveBase(object): Line 169  class PrimitiveBase(object):
169          out.modifyBy(transformation)          out.modifyBy(transformation)
170          return out          return out
171    
   
   
172  class Primitive(object):  class Primitive(object):
173      """      """
174      A general primitive      A general primitive
# Line 203  class Primitive(object): Line 201  class Primitive(object):
201          returns the underlying primitive          returns the underlying primitive
202          """          """
203          return self          return self
204        def hasSameOrientation(self,other):
205            """
206            returns True if other is the same primitive and has the same orientation
207            """
208            return self == other and isinstance(other,Primitive)
209    
210      def __neg__(self):      def __neg__(self):
211          """          """
# Line 271  class ReversePrimitive(object): Line 274  class ReversePrimitive(object):
274          """          """
275          return self.__primitive          return self.__primitive
276    
277        def hasSameOrientation(self,other):
278            """
279            returns True if other is the same primitive and has the same orientation
280            """
281            return self == other and isinstance(other,ReversePrimitive)
282    
283      def __repr__(self):      def __repr__(self):
284         return "-%s(%s)"%(self.__primitive.__class__.__name__,self.getID())         return "-%s(%s)"%(self.__primitive.__class__.__name__,self.getID())
285    
# Line 516  class Curve(CurveBase, Primitive): Line 525  class Curve(CurveBase, Primitive):
525         """         """
526         returns True curves are on the same position         returns True curves are on the same position
527         """         """
528         if isinstance(primitive.getUnderlyingPrimitive(),self.__class__):         if hasattr(primitive,"getUnderlyingPrimitive"):
529            if len(primitive) == len(self):           if isinstance(primitive.getUnderlyingPrimitive(),self.__class__):
530               if len(primitive) == len(self):
531               cp0=self.getControlPoints()               cp0=self.getControlPoints()
532               cp1=primitive.getControlPoints()               cp1=primitive.getControlPoints()
533               match=True               match=True
# Line 530  class Curve(CurveBase, Primitive): Line 540  class Curve(CurveBase, Primitive):
540                     if not cp0[i].isColocated(cp1[len(cp0)-1-i]):                     if not cp0[i].isColocated(cp1[len(cp0)-1-i]):
541                        return False                        return False
542               return True               return True
543            else:         return False
              return False  
        else:  
           return False  
544    
545  class ReverseCurve(CurveBase, ReversePrimitive):  class ReverseCurve(CurveBase, ReversePrimitive):
546      """      """
# Line 707  class Arc(ArcBase, Primitive): Line 714  class Arc(ArcBase, Primitive):
714         """         """
715         returns True curves are on the same position         returns True curves are on the same position
716         """         """
717         if isinstance(primitive.getUnderlyingPrimitive(),Arc):         if hasattr(primitive,"getUnderlyingPrimitive"):
718              if isinstance(primitive.getUnderlyingPrimitive(),Arc):
719              return (self.getCenterPoint().isColocated(primitive.getCenterPoint())) and ( \              return (self.getCenterPoint().isColocated(primitive.getCenterPoint())) and ( \
720                     (self.getEndPoint().isColocated(primitive.getEndPoint()) and self.getStartPoint().isColocated(primitive.getStartPoint()) ) \                     (self.getEndPoint().isColocated(primitive.getEndPoint()) and self.getStartPoint().isColocated(primitive.getStartPoint()) ) \
721                  or (self.getEndPoint().isColocated(primitive.getStartPoint()) and self.getStartPoint().isColocated(primitive.getEndPoint()) ) )                  or (self.getEndPoint().isColocated(primitive.getStartPoint()) and self.getStartPoint().isColocated(primitive.getEndPoint()) ) )
722         else:         return False
           return False  
723    
724  class ReverseArc(ArcBase, ReversePrimitive):  class ReverseArc(ArcBase, ReversePrimitive):
725      """      """
# Line 747  class ReverseArc(ArcBase, ReversePrimiti Line 754  class ReverseArc(ArcBase, ReversePrimiti
754    
755  class CurveLoop(Primitive, PrimitiveBase):  class CurveLoop(Primitive, PrimitiveBase):
756      """      """
757      An oriented loop of 1D primitives (= curves and arcs)      An oriented loop of one-dimensional manifolds (= curves and arcs)
758    
759      The loop must be closed and the L{Manifold1D}s should be oriented consistently.      The loop must be closed and the L{Manifold1D}s should be oriented consistently.
760      """      """
# Line 755  class CurveLoop(Primitive, PrimitiveBase Line 762  class CurveLoop(Primitive, PrimitiveBase
762         """         """
763         creates a polygon from a list of line curves. The curves must form a closed loop.         creates a polygon from a list of line curves. The curves must form a closed loop.
764         """         """
        Primitive.__init__(self)  
        PrimitiveBase.__init__(self)  
765         if len(curves)<2:         if len(curves)<2:
766              raise TypeError("at least two curves have to be given.")              raise TypeError("at least two curves have to be given.")
767         for i in range(len(curves)):         for i in range(len(curves)):
# Line 779  class CurveLoop(Primitive, PrimitiveBase Line 784  class CurveLoop(Primitive, PrimitiveBase
784               raise ValueError("loop is not closed.")               raise ValueError("loop is not closed.")
785         if not self.__curves[0].getStartPoint() == self.__curves[-1].getEndPoint():         if not self.__curves[0].getStartPoint() == self.__curves[-1].getEndPoint():
786            raise ValueError("loop is not closed.")            raise ValueError("loop is not closed.")
787           Primitive.__init__(self)
788           PrimitiveBase.__init__(self)
789    
790      def getCurves(self):      def getCurves(self):
791         """         """
# Line 823  class CurveLoop(Primitive, PrimitiveBase Line 830  class CurveLoop(Primitive, PrimitiveBase
830         """         """
831         returns True if each curve is collocted with a curve in primitive         returns True if each curve is collocted with a curve in primitive
832         """         """
833         if isinstance(primitive,CurveLoop):         if hasattr(primitive,"getUnderlyingPrimitive"):
834            if len(primitive) == len(self):            if isinstance(primitive.getUnderlyingPrimitive(),CurveLoop):
835               cp0=self.getCurves()               if len(primitive) == len(self):
836               cp1=primitive.getCurves()                  cp0=self.getCurves()
837               for c0 in cp0:                  cp1=primitive.getCurves()
838                   collocated = False                  for c0 in cp0:
839                   for c1 in cp1:                      collocated = False
840                        collocated = collocated or c0.isColocated(c1)                      for c1 in cp1:
841                   if not collocated: return False                           collocated = collocated or c0.isColocated(c1)
842               return True                      if not collocated: return False
843            else:                  return True
844               return False         return False
        else:  
           return False  
845    
846      def getGmshCommand(self,scaling_factor=1.):      def getGmshCommand(self,scaling_factor=1.):
847          """          """
# Line 852  class CurveLoop(Primitive, PrimitiveBase Line 857  class CurveLoop(Primitive, PrimitiveBase
857    
858  class ReverseCurveLoop(ReversePrimitive, PrimitiveBase):  class ReverseCurveLoop(ReversePrimitive, PrimitiveBase):
859      """      """
860      An oriented loop of 1D primitives (= curves and arcs)      An oriented loop of one-dimensional manifolds (= curves and arcs)
861    
862      The loop must be closed and the L{Manifold1D}s should be oriented consistently.      The loop must be closed and the one-dimensional manifolds should be oriented consistently.
863      """      """
864      def __init__(self,curve_loop):      def __init__(self,curve_loop):
865         """         """
# Line 874  class ReverseCurveLoop(ReversePrimitive, Line 879  class ReverseCurveLoop(ReversePrimitive,
879      def __len__(self):      def __len__(self):
880          return len(self.getUnderlyingPrimitive())          return len(self.getUnderlyingPrimitive())
881    
882  class PrimitiveBase2D(PrimitiveBase):  #=
883    class Manifold2D(PrimitiveBase):
884      """      """
885      general two-dimensional primitive      general two-dimensional manifold
886      """      """
887      def __init__(self):      def __init__(self):
           """  
           create a two-dimensional primitive  
           """  
           super(PrimitiveBase2D, self).__init__()  
   
     def getBoundary(self):  
         """  
         returns a list of the 1D primitives forming the boundary of the Surface (including holes)  
         """  
         out=[]  
         for i in self.getPrimitives():  
              if isinstance(i, Manifold1D): out.append(i)  
         return out  
   
     def getBoundary(self):  
         """  
         returns a list of the 1D primitives forming the boundary of the Surface (including holes)  
         """  
         out=[]  
         for i in self.getPrimitives():  
              if isinstance(i, Manifold1D): out.append(i)  
         return out  
   
     def getBoundaryLoop(self):  
         """  
         returns the loop defining the outer boundary  
         """  
         raise NotImplementedError("getBoundaryLoop is not implemented for this class %s."%self.__class__.__name__)  
   
     def getHoles(self):  
888         """         """
889         returns the holes         create a two-dimensional manifold
890         """         """
891         raise NotImplementedError("getHoles is not implemented for this class %s."%self.__class__.__name__)         PrimitiveBase.__init__(self)
892    
893      def collectPrimitiveBases(self):      def getBoundary(self):
894          """          """
895          returns primitives used to construct the Surface          returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
896          """          """
897          out=[self] + self.getBoundaryLoop().collectPrimitiveBases()          raise NotImplementedError()
         for i in self.getHoles(): out+=i.collectPrimitiveBases()  
         return out  
898    
899  class RuledSurface(PrimitiveBase2D):  class RuledSurface(Primitive, Manifold2D):
900      """      """
901      A ruled surface, i.e., a surface that can be interpolated using transfinite interpolation      A ruled surface, i.e., a surface that can be interpolated using transfinite interpolation
902      """      """
# Line 932  class RuledSurface(PrimitiveBase2D): Line 906  class RuledSurface(PrimitiveBase2D):
906    
907         @param loop: L{CurveLoop} defining the boundary of the surface.         @param loop: L{CurveLoop} defining the boundary of the surface.
908         """         """
909         super(RuledSurface, self).__init__()         if not isinstance(loop.getUnderlyingPrimitive(),CurveLoop):
        if not isinstance(loop,CurveLoop):  
910             raise TypeError("argument loop needs to be a CurveLoop object.")             raise TypeError("argument loop needs to be a CurveLoop object.")
911         if len(loop)<2:         if len(loop)<2:
912             raise TypeError("the loop must contain at least two Curves.")             raise TypeError("the loop must contain at least two Curves.")
913         if len(loop)>4:         if len(loop)>4:
914             raise TypeError("the loop must contain at least three Curves.")             raise TypeError("the loop must contain at least three Curves.")
915           Primitive.__init__(self)
916           Manifold2D.__init__(self)
917         self.__loop=loop         self.__loop=loop
918    
919        def __neg__(self):
920              """
921              returns a view onto the suface with reversed ordering
922              """
923              return ReverseRuledSurface(self)
924    
925      def getBoundaryLoop(self):      def getBoundaryLoop(self):
926          """          """
927          returns the loop defining the outer boundary          returns the loop defining the outer boundary
928          """          """
929          return self.__loop          return self.__loop
930    
931      def getHoles(self):      def getBoundary(self):
932          """          """
933          returns the holes          returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
934          """          """
935          return []          return self.getBoundaryLoop().getCurves()
936    
937      def getGmshCommand(self,scaling_factor=1.):      def getGmshCommand(self,scaling_factor=1.):
938          """          """
# Line 974  class RuledSurface(PrimitiveBase2D): Line 954  class RuledSurface(PrimitiveBase2D):
954         """         """
955         returns True if each curve is collocted with a curve in primitive         returns True if each curve is collocted with a curve in primitive
956         """         """
957         if isinstance(primitive,RuledSurface):         if hasattr(primitive,"getUnderlyingPrimitive"):
958            return self.getBoundaryLoop().isColocated(primitive.getBoundaryLoop())            if isinstance(primitive.getUnderlyingPrimitive(),RuledSurface):
959         else:               return self.getBoundaryLoop().isColocated(primitive.getBoundaryLoop())
960            return False         return False
961    
962        def collectPrimitiveBases(self):
963            """
964            returns primitives used to construct the Surface
965            """
966            return [self] + self.getBoundaryLoop().collectPrimitiveBases()
967    
968  def createRuledSurface(*curves):  def createRuledSurface(*curves):
969        """        """
# Line 985  def createRuledSurface(*curves): Line 971  def createRuledSurface(*curves):
971        """        """
972        return RuledSurface(CurveLoop(*curves))        return RuledSurface(CurveLoop(*curves))
973    
974  class PlaneSurface(PrimitiveBase2D):  
975    class ReverseRuledSurface(ReversePrimitive, Manifold2D):
976        """
977        creates a view onto a L{RuledSurface} but with the reverse orientation
978        """
979        def __init__(self,surface):
980           """
981           creates a polygon from a list of line curves. The curves must form a closed loop.
982           """
983           if not isinstance(surface, RuledSurface):
984               raise ValueError("arguments need to be an instance of CurveLoop.")
985           ReversePrimitive.__init__(self, surface)
986           Manifold2D.__init__(self)
987    
988        def getBoundaryLoop(self):
989           """
990           returns the CurveLoop defining the RuledSurface
991           """
992           return -self.getUnderlyingPrimitive().getBoundaryLoop()
993    
994        def getBoundary(self):
995            """
996            returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
997            """
998            return self.getBoundaryLoop().getCurves()
999    #==============================
1000    class PlaneSurface(Primitive, Manifold2D):
1001      """      """
1002      a plane surface with holes      a plane surface with holes
1003      """      """
# Line 998  class PlaneSurface(PrimitiveBase2D): Line 1010  class PlaneSurface(PrimitiveBase2D):
1010         @note: A CurveLoop defining a hole should not have any lines in common with the exterior CurveLoop.           @note: A CurveLoop defining a hole should not have any lines in common with the exterior CurveLoop.  
1011                A CurveLoop defining a hole should not have any lines in common with another CurveLoop defining a hole in the same surface.                A CurveLoop defining a hole should not have any lines in common with another CurveLoop defining a hole in the same surface.
1012         """         """
1013         super(PlaneSurface, self).__init__()         if not isinstance(loop.getUnderlyingPrimitive(),CurveLoop):
        if not isinstance(loop,CurveLoop):  
1014             raise TypeError("argument loop needs to be a CurveLoop object.")             raise TypeError("argument loop needs to be a CurveLoop object.")
1015         for l in loop.getCurves():         for l in loop.getCurves():
1016             if not isinstance(l,Line):             if not isinstance(l.getUnderlyingPrimitive(),Line):
1017               raise TypeError("loop may be formed by Lines only.")               raise TypeError("loop may be formed by Lines only.")
1018         for i in range(len(holes)):         for i in range(len(holes)):
1019              if not isinstance(holes[i], CurveLoop):              if not isinstance(holes[i].getUnderlyingPrimitive(), CurveLoop):
1020                   raise TypeError("%i-th hole needs to be a CurveLoop object.")                   raise TypeError("%i-th hole needs to be a CurveLoop object.")
1021              for l in holes[i].getCurves():              for l in holes[i].getCurves():
1022                 if not isinstance(l,Line):                 if not isinstance(l.getUnderlyingPrimitive(),Line):
1023                    raise TypeError("holes may be formed by Lines only.")                    raise TypeError("holes may be formed by Lines only.")
1024         #TODO: check if lines and holes are in a plane         #TODO: check if lines and holes are in a plane
1025         #TODO: are holes really holes?         #TODO: are holes really holes?
1026           Primitive.__init__(self)
1027           Manifold2D.__init__(self)
1028         self.__loop=loop         self.__loop=loop
1029         self.__holes=holes         self.__holes=holes
1030      def getHoles(self):      def getHoles(self):
# Line 1019  class PlaneSurface(PrimitiveBase2D): Line 1032  class PlaneSurface(PrimitiveBase2D):
1032         returns the holes         returns the holes
1033         """         """
1034         return self.__holes         return self.__holes
1035    
1036      def getBoundaryLoop(self):      def getBoundaryLoop(self):
1037          """          """
1038          returns the loop defining the boundary          returns the loop defining the boundary
# Line 1054  class PlaneSurface(PrimitiveBase2D): Line 1068  class PlaneSurface(PrimitiveBase2D):
1068         """         """
1069         returns True if each curve is collocted with a curve in primitive         returns True if each curve is collocted with a curve in primitive
1070         """         """
1071         if isinstance(primitive,PlaneSurface):         if hasattr(primitive,"getUnderlyingPrimitive"):
1072            if self.getBoundaryLoop().isColocated(primitive.getBoundaryLoop()):            if isinstance(primitive.getUnderlyingPrimitive(),PlaneSurface):
1073               hs0=self.getHoles()               if self.getBoundaryLoop().isColocated(primitive.getBoundaryLoop()):
1074               hs1=primitive.getHoles()                  hs0=self.getHoles()
1075               if len(hs0) == len(hs1):                  hs1=primitive.getHoles()
1076                   for h0 in hs0:                  if len(hs0) == len(hs1):
1077                      collocated = False                      for h0 in hs0:
1078                      for h1 in hs1:                         collocated = False
1079                        collocated = collocated or h0.isColocated(h1)                         for h1 in hs1:
1080                      if not collocated: return False                           collocated = collocated or h0.isColocated(h1)
1081                   return True                         if not collocated: return False
1082               return False                      return True
1083            else:         return False
1084               return False      def collectPrimitiveBases(self):
1085         else:          """
1086            return False          returns primitives used to construct the Surface
1087            """
1088            out=[self] + self.getBoundaryLoop().collectPrimitiveBases()
1089            for i in self.getHoles(): out+=i.collectPrimitiveBases()
1090            return out
1091        def __neg__(self):
1092              """
1093              returns a view onto the curve with reversed ordering
1094              """
1095              return ReversePlaneSurface(self)
1096        def getBoundary(self):
1097            """
1098            returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
1099            """
1100            out = []+ self.getBoundaryLoop().getCurves()
1101            for h in self.getHoles(): out+=h.getCurves()
1102            return out
1103    
1104    class ReversePlaneSurface(ReversePrimitive, Manifold2D):
1105        """
1106        creates a view onto a L{PlaneSurface} but with the reverse orientation
1107        """
1108        def __init__(self,surface):
1109           """
1110           creates a polygon from a list of line curves. The curves must form a closed loop.
1111           """
1112           if not isinstance(surface, PlaneSurface):
1113               raise ValueError("arguments need to be an instance of PlaneSurface.")
1114           ReversePrimitive.__init__(self, surface)
1115           Manifold2D.__init__(self)
1116    
1117        def getBoundaryLoop(self):
1118           """
1119           returns the CurveLoop defining the RuledSurface
1120           """
1121           return -self.getUnderlyingPrimitive().getBoundaryLoop()
1122    
1123        def getHoles(self):
1124            """
1125            returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
1126            """
1127            return [ -h for h in self.getUnderlyingPrimitive().getHoles() ]
1128    
1129        def getBoundary(self):
1130            """
1131            returns a list of the one-dimensional manifolds forming the boundary of the Surface (including holes)
1132            """
1133            out = [] + self.getBoundaryLoop().getCurves()
1134            for h in self.getHoles(): out+=h.getCurves()
1135            return out
1136    
1137    
1138  class SurfaceLoop(PrimitiveBase):  #=========================================================================
1139    class SurfaceLoop(Primitive, PrimitiveBase):
1140      """      """
1141      a loop of 2D primitives. It defines the shell of a volume.      a loop of 2D primitives. It defines the shell of a volume.
1142    
# Line 1081  class SurfaceLoop(PrimitiveBase): Line 1146  class SurfaceLoop(PrimitiveBase):
1146         """         """
1147         creates a surface loop         creates a surface loop
1148         """         """
        super(SurfaceLoop, self).__init__()  
1149         if len(surfaces)<2:         if len(surfaces)<2:
1150              raise TypeError("at least two surfaces have to be given.")              raise TypeError("at least two surfaces have to be given.")
1151         for i in range(len(surfaces)):         for i in range(len(surfaces)):
1152             if not isinstance(surfaces[i],PrimitiveBase2D):             if not isinstance(surfaces[i].getUnderlyingPrimitive(),Manifold2D):
1153                raise TypeError("%s-th argument is not a PrimitiveBase2D object."%i)                raise TypeError("%s-th argument is not a Manifold2D object."%i)
1154           Primitive.__init__(self)
1155           PrimitiveBase.__init__(self)
1156         # for the curves a loop:         # for the curves a loop:
1157         used=[ True for s in surfaces]         used=[ False for s in surfaces]
1158         self.__surfaces=[surfaces[0]]         self.__surfaces=[surfaces[0]]
1159         edges=[ e in surfaces[0].getBoundary() ]         used[0]= True
1160         used_edges=[ False in surfaces[0].getBoundary() ]         edges=[ e for e in surfaces[0].getBoundary() ]
1161         while min(used):         used_edges=[ False for e in surfaces[0].getBoundary() ]
1162           while not min(used):
1163            found=False            found=False
1164            for i in xrange(len(surfaces)):            for i in xrange(len(surfaces)):
1165               if not used[i]:               if not used[i]:
1166                  i_boundary=surfaces[i].getBoundary()                  i_boundary=surfaces[i].getBoundary()
1167                  for ib in xrange(i_boundary):                    print i, i_boundary
1168                    for ib in xrange(len(i_boundary)):  
1169                        print ib, i_boundary[ib], edges
1170                      if i_boundary[ib] in edges:                      if i_boundary[ib] in edges:
1171                           if used_edges[edges.index(i_boundary[ib])]:                           if used_edges[edges.index(i_boundary[ib])]:
1172                              raise TypeError("boundary segment %s is shared by more than one surface."%str(i_boundary[ib]))                              raise ValueError("boundary segment %s is shared by more than one surface."%str(i_boundary[ib]))
1173                           used_edges[edges.index(i_boundary[ib])]=True                           used_edges[edges.index(i_boundary[ib])]=True
1174                           self.__surfaces.append(surfaces[i])                           self.__surfaces.append(surfaces[i])
1175                           for b in i_boundary:                           for b in i_boundary:
# Line 1113  class SurfaceLoop(PrimitiveBase): Line 1182  class SurfaceLoop(PrimitiveBase):
1182               if found: break               if found: break
1183            if not found:            if not found:
1184               raise ValueError("loop is not closed.")               raise ValueError("loop is not closed.")
1185           print min(used_edges), used_edges
1186         if min(used_edges):         if min(used_edges):
1187            raise ValueError("loop is not closed. Surface is missing.")            raise ValueError("loop is not closed. Surface is missing.")
1188      def __len__(self):      def __len__(self):
# Line 1121  class SurfaceLoop(PrimitiveBase): Line 1191  class SurfaceLoop(PrimitiveBase):
1191         """         """
1192         return len(self.__surfaces)         return len(self.__surfaces)
1193    
1194        def __neg__(self):
1195           """
1196           returns a view onto the curve with reversed ordering
1197           """
1198           return ReverseSurfaceLoop(self)
1199    
1200      def getSurfaces(self):      def getSurfaces(self):
1201         """         """
1202         returns the surfaces defining the SurfaceLoop         returns the surfaces defining the SurfaceLoop
1203         """         """
1204         return self.__curves         return self.__surfaces
1205    
1206      def collectPrimitiveBases(self):      def collectPrimitiveBases(self):
1207         """         """
# Line 1134  class SurfaceLoop(PrimitiveBase): Line 1210  class SurfaceLoop(PrimitiveBase):
1210         out=[self]         out=[self]
1211         for c in self.getSurfaces(): out+=c.collectPrimitiveBases()         for c in self.getSurfaces(): out+=c.collectPrimitiveBases()
1212         return out         return out
1213    
1214      def getGmshCommand(self,scaling_factor=1.):      def getGmshCommand(self,scaling_factor=1.):
1215          """          """
1216          returns the Gmsh command(s) to create the primitive          returns the Gmsh command(s) to create the primitive
# Line 1161  class SurfaceLoop(PrimitiveBase): Line 1238  class SurfaceLoop(PrimitiveBase):
1238         """         """
1239         returns True if each surface is collocted with a curve in primitive and vice versa.         returns True if each surface is collocted with a curve in primitive and vice versa.
1240         """         """
1241         if isinstance(primitive,SurfaceLoop):         if hasattr(primitive,"getUnderlyingPrimitive"):
1242           if len(primitive) == len(self):           if isinstance(primitive.getUnderlyingPrimitive(),SurfaceLoop):
1243               sp0=self.getSurfaces()              if len(primitive) == len(self):
1244               sp1=primitive.getCurves()                  sp0=self.getSurfaces()
1245               for s0 in sp0:                  sp1=primitive.getCurves()
1246                   collocated = False                  for s0 in sp0:
1247                   for s1 in sp1:                      collocated = False
1248                        collocated = collocated or s0.isColocated(s1)                      for s1 in sp1:
1249                   if not collocated: return False                           collocated = collocated or s0.isColocated(s1)
1250               return True                      if not collocated: return False
1251           else:                  return True
1252               return False         return False
1253         else:  
1254           return False  class ReverseSurfaceLoop(ReversePrimitive, PrimitiveBase):
1255        """
1256        a view to SurfaceLoop with reverse orientaion
1257    
1258        The loop must represent a closed shell, and the primitives should be oriented consistently.
1259        An oriented loop of 2-dimensional manifolds (= RuledSurface, PlaneSurface)
1260    
1261        The loop must be closed and the one-dimensional manifolds should be oriented consistently.
1262        """
1263        def __init__(self,surface_loop):
1264           """
1265           creates a polygon from a list of line surfaces. The curves must form a closed loop.
1266           """
1267           if not isinstance(surface_loop, SurfaceLoop):
1268               raise ValueError("arguments need to be an instance of SurfaceLoop.")
1269           ReversePrimitive.__init__(self, surface_loop)
1270           PrimitiveBase.__init__(self)
1271    
1272        def getSurfaces(self):
1273           """
1274           returns the surfaces defining the SurfaceLoop
1275           """
1276           return [ -s for s in  self.getUnderlyingPrimitive().getSurfaces() ]
1277    
1278        def __len__(self):
1279            return len(self.getUnderlyingPrimitive())
1280  #==========================  #==========================
1281  class Volume(PrimitiveBase):  class Volume(PrimitiveBase):
1282      """      """
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