8.9.3.51 IfcPolyline

RV ⓘ

AbV ⓘ

8.9.3.51.1 Semantic definition

The IfcPolyline is a bounded curve with only linear segments defined by a list of Cartesian points. If the first and the last Cartesian point in the list are identical, then the polyline is a closed curve, otherwise it is an open curve.

polyline examples — Figure A — Bounded _IfcPolyline_ with parametric length

{ .extDef}

for 1 ≤ i ≤ n - 1 where i - 1 ≤ u ≤ i and with parametric range of 0 <≤ u ≤ n - 1.
Figure B

8.9.3.51.2 Entity inheritance

8.9.3.51.3 Attributes

#	Attribute	Type	Description
IfcRepresentationItem (2)
	LayerAssignment	SET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItems	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.
	StyledByItem	SET [0:1] OF IfcStyledItem FOR Item	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.
IfcCurve (1)
*	Dim	IfcDimensionCount	This attribute is formally derived. `IfcCurveDim(SELF)` The space dimensionality of this abstract class, defined differently for all subtypes, i.e. for IfcLine, IfcConic and IfcBoundedCurve.
Click to show 3 hidden inherited attributes Click to hide 3 inherited attributes
IfcPolyline (1)
1	Points	LIST [2:?] OF IfcCartesianPoint	The points defining the polyline.

Table C

8.9.3.51.4 Formal propositions

Name	Description
SameDim	The space dimensionality of all Points shall be the same.
`SIZEOF(QUERY(Temp <* Points \| Temp.Dim <> Points[1].Dim)) = 0`

Table D

8.9.3.51.5 Formal representation

ENTITY IfcPolyline
SUBTYPE OF (IfcBoundedCurve);
Points : LIST [2:?] OF IfcCartesianPoint;
WHERE
SameDim : SIZEOF(QUERY(Temp <* Points | Temp.Dim <> Points[1].Dim)) = 0;
END_ENTITY;