IfcPointOnCurve

IfcPointOnCurve是由其定义曲线的参数值定义的点。

注：定义根据ISO/CD 10303-42:1992

IfcPointOnCurve是位于曲线上的点。通过在特定参数值下评估曲线来确定点。点的坐标空间维数为基曲线的坐标空间维数。

注：实体改编自ISO 10303-42中_曲线上的点。

IFC2x2中增加的新实体。

非正式提议：

●点参数的值不应超出曲线的参数范围

#	Attribute	Type	Cardinality	Description	C
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @AssignedItems	S[0:1]	Assignment of the representation item to a single or multiple layer(s). The LayerAssignments can override a LayerAssignments of the IfcRepresentation it is used within the list of Items.	X
	StyledByItem	IfcStyledItem @Item	S[0:1]	Reference to the IfcStyledItem that provides presentation information to the representation, e.g. a curve style, including colour and thickness to a geometric curve.	X
IfcGeometricRepresentationItem
IfcPoint
IfcPointOnCurve
1	BasisCurve	IfcCurve	[1:1]	The curve to which point parameter relates.	X
2	PointParameter	IfcParameterValue	[1:1]	The parameter value of the point location.	X
	Dim :=BasisCurve.Dim	IfcDimensionCount	[1:1]	The space dimensionality of this class, determined by the space dimensionality of the basis curve.	X

EXPRESS Specification

ENTITY IfcPointOnCurve
 SUBTYPE OF (IfcPoint);
  BasisCurve : IfcCurve;
  PointParameter : IfcParameterValue;
 DERIVE
  Dim : IfcDimensionCount := BasisCurve.Dim;
END_ENTITY;