函数定义

注：定义符合ISO/CD 10303-42:1992
此函数检查各种子类型曲线的维数。它返回曲线实例中使用的基本点和方向的维数。
注：本规范允许在相同的几何表示上下文中混合维度。
IFC2x中增加的新函数

 

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.IFCPCURVE' IN TYPEOF(Curve))
    THEN RETURN(3);
  END_IF;
  IF ('IFC4.IFCINDEXEDPOLYCURVE' IN TYPEOF(Curve))
    THEN RETURN(Curve\IfcIndexedPolyCurve.Points.Dim);
  END_IF;
RETURN (?); 
END_FUNCTION;