IfcPointOnCurve

Semantic definitions at the entity

Entity definition

The IfcPointOnCurve is a point defined by a parameter value of its defining curve.

NOTE Definition according to ISO/CD 10303-42:1992
A point on curve is a point which lies on a curve. The point is determined by evaluating the curve at a specific parameter value. The coordinate space dimensionality of the point is that of the basis curve.

NOTE Entity adapted from point_on_curve in ISO 10303-42.

HISTORY New entity in IFC2x2.

Informal Propositions:

The value of the point parameter shall not be outside the parametric range of the curve.

Attribute definitions

#	Attribute	Type	Description	G
1	BasisCurve	IfcCurve	The curve to which point parameter relates.	X
2	PointParameter	IfcParameterValue	The parameter value of the point location.	X
	Dim :=BasisCurve.Dim	IfcDimensionCount	The space dimensionality of this class, determined by the space dimensionality of the basis curve.	X

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
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. IFC2x3 CHANGE The inverse attribute LayerAssignments has been added. IFC4 CHANGE The inverse attribute LayerAssignment has been restricted to max 1. Upward compatibility for file based exchange is guaranteed.	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. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcPoint
IfcPointOnCurve
1	BasisCurve	IfcCurve		The curve to which point parameter relates.	X
2	PointParameter	IfcParameterValue		The parameter value of the point location.	X
	Dim :=BasisCurve.Dim	IfcDimensionCount		The space dimensionality of this class, determined by the space dimensionality of the basis curve.	X

Formal representations

XML Specification

 <xs:element name="IfcPointOnCurve" type="ifc:IfcPointOnCurve" substitutionGroup="ifc:IfcPoint" nillable="true"/>

 <xs:complexType name="IfcPointOnCurve">

  <xs:complexContent>

   <xs:extension base="ifc:IfcPoint">

    <xs:sequence>

     <xs:element name="BasisCurve" type="ifc:IfcCurve" nillable="true"/>

    </xs:sequence>

    <xs:attribute name="PointParameter" type="ifc:IfcParameterValue" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcPointOnCurve

 SUBTYPE OF (IfcPoint);

  BasisCurve : IfcCurve;

  PointParameter : IfcParameterValue;

 DERIVE

  Dim : IfcDimensionCount := BasisCurve.Dim;

END_ENTITY;

 EXPRESS-G diagram

	Punkt auf einer Kurve
	Point On Curve
	Point de courbe