IFC 4.3.x development

8.8.3.9 IfcCartesianPointList2D

Change log

IFC4

added

IFC4X1

additionsattributesTagList

8.8.3.9.1 Semantic definitions at the entity

The IfcCartesianPointList2D defines an ordered collection of two-dimentional Cartesian points. Each Cartesian point is provided as an two-dimensional point by a fixed list of two coordinates. The attribute CoordList is a two-dimensional list, where

  • first dimension is an unbounded list representing each 2D Cartesian point;
  • second dimension is a fixed list of two list members, where [1] is the x-coordinate, and [2] the y-coordinate of the Cartesian point.

NOTE  The IfcCartesianPointList2D is introduced to provide a compact representation of larger list of points, such as in indexable representation of points used as vertices in poly curves.

HISTORY  New entity in IFC4 ADD1.

8.8.3.9.1 Attributes

# Attribute Type Description
IfcRepresentationItem
LayerAssignmentSET [0:1] OF IfcPresentationLayerAssignment FOR AssignedItemsAssignment 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.
IfcGeometricRepresentationItem
IfcCartesianPointList
Dim INVALID The space dimensionality of this class, either 2 or 3, depending on the sub type.
IfcCartesianPointList2D
1 CoordList LIST [1:?] OF LIST [2:2] OF IfcLengthMeasure Two-dimensional list of Cartesian points provided by two coordinates.
2 TagList OPTIONAL LIST [1:?] OF IfcLabel List of tags corresponding to each point that may be used to identify a basis curve according to the Tag attribute at IfcOffsetCurveByDistances or IfcAlignmentCurve.

8.8.3.9.2 Entity inheritance

dot_inheritance IfcCartesianPointList2D IfcCartesianPointList2D IfcCartesianPointList IfcCartesianPointList IfcCartesianPointList2D->IfcCartesianPointList IfcCartesianPointList3D IfcCartesianPointList3D IfcCartesianPointList3D->IfcCartesianPointList IfcGeometricRepresentationItem IfcGeometricRepresentationItem IfcCartesianPointList->IfcGeometricRepresentationItem IfcGeometricRepresentationItem_children 24 more... IfcGeometricRepresentationItem_children->IfcGeometricRepresentationItem IfcRepresentationItem IfcRepresentationItem IfcGeometricRepresentationItem->IfcRepresentationItem IfcRepresentationItem_children 3 more... IfcRepresentationItem_children->IfcRepresentationItem

8.8.3.9.3 Formal representations

ENTITY IfcCartesianPointList2D
 SUBTYPE OF (IfcCartesianPointList);
	CoordList : LIST [1:?] OF LIST [2:2] OF IfcLengthMeasure;
	TagList : OPTIONAL LIST [1:?] OF IfcLabel;
END_ENTITY;