8.9.3.51 IfcPolyline

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.

Figure 8.9.3.51.A illustrates a bounded IfcPolyline and shows the parametric length of each segment and of the total polyline.

polyline examples — Figure 8.9.3.51.A — Bounded _IfcPolyline_ with parametric length

Definition according to ISO/CD 10303-42:1992 A polyline is a bounded curve of n - 1 linear segments, defined by a list of n points, P~1~, P~2~ ... P~n~. The _i_th segment of the curve is parameterized as follows: Entity adapted from polyline in ISO 10303-42. New entity in IFC1.0

for 1 ≤ i ≤ n - 1 where i - 1 ≤ u ≤ i and with parametric range of 0 <≤ u ≤ n - 1.
Figure 8.9.3.51.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 8.9.3.51.Q

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 8.9.3.51.R

8.9.3.51.5 Examples

Figure 8.9.3.51.C

Beam Varying Profiles
Figure 8.9.3.51.D

Beam Varying Extrusion Paths
Figure 8.9.3.51.E

Beam Varying Cardinal Points
Figure 8.9.3.51.F

Wall Extrusion
Figure 8.9.3.51.G

Basin Advanced Brep
Figure 8.9.3.51.H

Curve Parameters In Degrees
Figure 8.9.3.51.I

Cube Advanced Brep
Figure 8.9.3.51.J

Curve Parameters In Radians
Figure 8.9.3.51.K

Reinforcing Assembly
Figure 8.9.3.51.L

Geographic Referencing Rigid Operation
Figure 8.9.3.51.M

Column Extruded Solid
Figure 8.9.3.51.N

Construction Scheduling Task
Figure 8.9.3.51.O

Beam Parametric Cross Section
Figure 8.9.3.51.P

Grid Placement

8.9.3.51.6 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;

8.9.3.51 IfcPolyline

8.9.3.51.1 Semantic definition

8.9.3.51.2 Entity inheritance

8.9.3.51.3 Attributes

8.9.3.51.4 Formal propositions

8.9.3.51.5 Examples

8.9.3.51.6 Formal representation

8.9.3.51.7 References

8.9.3.51.8 Changelog

8.9.3.51.8.1 IFC4