IfcCurveDim

Semantic definitions at the function

Function Definition

NOTE Definition according to ISO/CD 10303-42:1992
This function checks the dimensionality of various subtypes of curve. It returns the dimensionality of the basic points and directions used at the instance of curve.

NOTE This specification allows for mixed dimensionality within the same geometric representation context.

HISTORY New function in IFC2x

Formal representations

EXPRESS Specification


FUNCTION IfcCurveDim


(Curve : IfcCurve)
       : IfcDimensionCount;

  IF ('IFCGEOMETRYRESOURCE.IfcLine' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcLine.Pnt.Dim);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcConic' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcConic.Position.Dim);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcPolyline' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcPolyline.Points[1].Dim);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcTrimmedCurve' IN TYPEOF(Curve))
    THEN RETURN(IfcCurveDim(Curve\IfcTrimmedCurve.BasisCurve));
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcCompositeCurve' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcCompositeCurve.Segments[1].Dim);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcBSplineCurve' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcBSplineCurve.ControlPointsList[1].Dim);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcOffsetCurve2D' IN TYPEOF(Curve))
    THEN RETURN(2); 
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcOffsetCurve3D' IN TYPEOF(Curve))
    THEN RETURN(3);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcOffsetCurveByDistances' IN TYPEOF(Curve))
    THEN RETURN(3);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcCurveSegment2D' IN TYPEOF(Curve))
    THEN RETURN(2);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcAlignmentCurve' IN TYPEOF(Curve))
    THEN RETURN(3);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcPcurve' IN TYPEOF(Curve))
    THEN RETURN(3);
  END_IF;
  IF ('IFCGEOMETRYRESOURCE.IfcIndexedPolyCurve' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcIndexedPolyCurve.Points.Dim);
  END_IF;
RETURN (?);




END_FUNCTION;