IfcPointOnCurve

Natural language names
Punkt auf einer Kurve
Point On Curve
Point de courbe
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:

  1. The value of the point parameter shall not be outside the parametric range of the curve.
Attribute definitions
#AttributeTypeCardinalityDescription G
1BasisCurveIfcCurve The curve to which point parameter relates. X
2PointParameterIfcParameterValue The parameter value of the point location. X
Inherited definitions from supertypes
Entity inheritance IfcPoint IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionG
IfcRepresentationItem
LayerAssignmentIfcPresentationLayerAssignment
@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
StyledByItemIfcStyledItem
@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
Dim
:=IfcPointDim(SELF)
IfcDimensionCountThe space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases. X
IfcPointOnCurve
1BasisCurveIfcCurve The curve to which point parameter relates. X
2PointParameterIfcParameterValue The parameter value of the point location. 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;
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

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