IfcLineSegment2D

Item	SPF	XML	Change	Description
IFC4 ADD1 to IFC4x1
IfcLineSegment2D			ADDED

Semantic definitions at the entity

Entity definition

The line segment is defined using the inherited start point, start distance and segment length parameter.

Figure 261 — Line segment 2D

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	B
IfcRepresentationItem
	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
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
IfcBoundedCurve
IfcCurveSegment2D
1	StartPoint	IfcCartesianPoint	[1:1]	The start point of the 2D curve as x/y coordinates defined by a 2D Cartesian point.	X
2	StartDirection	IfcPlaneAngleMeasure	[1:1]	The direction of the tangent at the start point. Direction value 0. indicates a curve with a start tangent along the positive x-axis. Values increases counter-clockwise, and decreases clockwise. Depending on the plane angle unit, either degree or radians, the sensible range is -360° ≤ n ≤ 360° (or -2π ≤ n ≤ 2π). Values larger then a full circle (>\|360°\| or >\|2 π\| shall not be used.	X
3	SegmentLength	IfcPositiveLengthMeasure	[1:1]	The length along the curve	X
IfcLineSegment2D

Formal representations

XSD Specification

 <xs:element name="IfcLineSegment2D" type="ifc:IfcLineSegment2D" substitutionGroup="ifc:IfcCurveSegment2D" nillable="true"/>

 <xs:complexType name="IfcLineSegment2D">

  <xs:complexContent>

   <xs:extension base="ifc:IfcCurveSegment2D"/>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcLineSegment2D

 SUBTYPE OF (IfcCurveSegment2D);

END_ENTITY;

 EXPRESS-G diagram