IfcCurve

Natural language names
deKurve
enCurve
frCourbe
Semantic definitions at the entity
Entity definition

An IfcCurve is a curve in two-dimensional or three-dimensional space. It includes definitions for bounded and unbounded curves.

NOTE  Definition according to ISO 10303-42:
A curve can be envisioned as the path of a point moving in its coordinate space.
NOTE Entity adapted from curve defined in ISO 10303-42
HISTORY  New entity in IFC1.0

Informal Propositions:

  1. A curve shall be arcwise connected
  2. A curve shall have an arc length greater than zero.
Attribute definitions
#AttributeTypeCardinalityDescription C
Dim
:=IfcCurveDim(SELF)
IfcDimensionCount[1:1]The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. X
Inherited definitions from supertypes
Entity inheritance IfcBoundedCurve IfcConic IfcLine IfcOffsetCurve2D IfcOffsetCurve3D IfcPcurve IfcGeometricRepresentationItem IfcRepresentationItem
Attribute inheritance
#AttributeTypeCardinalityDescriptionC
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. 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. X
IfcGeometricRepresentationItem
IfcCurve
Dim
:=IfcCurveDim(SELF)
IfcDimensionCount[1:1]The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve. X
Formal representations
XSD Specification
 <xs:element name="IfcCurve" type="ifc:IfcCurve" abstract="true" substitutionGroup="ifc:IfcGeometricRepresentationItem" nillable="true"/>
 <xs:complexType name="IfcCurve" abstract="true">
  <xs:complexContent>
   <xs:extension base="ifc:IfcGeometricRepresentationItem"/>
  </xs:complexContent>
 </xs:complexType>
EXPRESS Specification
ENTITY IfcCurve
 ABSTRACT SUPERTYPE OF(ONEOF(IfcBoundedCurve, IfcConic, IfcLine, IfcOffsetCurve2D, IfcOffsetCurve3D, IfcPcurve))
 SUBTYPE OF (IfcGeometricRepresentationItem);
 DERIVE
  Dim : IfcDimensionCount := IfcCurveDim(SELF);
END_ENTITY;

Link to EXPRESS-G diagram EXPRESS-G diagram

Link to this page  Link to this page