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(CurveIfcLine.Pnt.Dim);
END_IF;
IF ('IFCGEOMETRYRESOURCE.IFCCONIC' IN TYPEOF(Curve))
THEN RETURN(CurveIfcConic.Position.Dim);
END_IF;
IF ('IFCGEOMETRYRESOURCE.IFCPOLYLINE' IN TYPEOF(Curve))
THEN RETURN(CurveIfcPolyline.Points[1].Dim);
END_IF;
IF ('IFCGEOMETRYRESOURCE.IFCTRIMMEDCURVE' IN TYPEOF(Curve))
THEN RETURN(IfcCurveDim(CurveIfcTrimmedCurve.BasisCurve));
END_IF;
IF ('IFCGEOMETRYRESOURCE.IFCCOMPOSITECURVE' IN TYPEOF(Curve))
THEN RETURN(CurveIfcCompositeCurve.Segments[1].Dim);
END_IF;
IF ('IFCGEOMETRYRESOURCE.IFCBSPLINECURVE' IN TYPEOF(Curve))
THEN RETURN(CurveIfcBSplineCurve.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(CurveIfcIndexedPolyCurve.Points.Dim);
END_IF;
RETURN (?);
END_FUNCTION;