IfcCartesianPoint

Semantic definitions at the entity

Entity definition

An IfcCartesianPoint defines a point by coordinates in an orthogonal, right-handed Cartesian coordinate system. For the purpose of this specification only two and three dimensional Cartesian points are used.

NOTE Definition according to ISO/CD 10303-42:1992
A cartesian_point is a point defined by its coordinates in a rectangular Cartesian coordinate system, or in a parameter space. The entity is defined in a one, two or three-dimensional space as determined by the number of coordinates in the list. Depending upon the geometric representation context in which the point is used the names of the coordinates may be (x,y,z), or (u,v), or any other chosen values.

NOTE Entity adapted from cartesian_point defined in ISO 10303-42

HISTORY New entity in IFC1.0

Attribute definitions

#	Attribute	Type	Cardinality	Description	G
1	Coordinates	IfcLengthMeasure	L[1:3]	The first, second, and third coordinate of the point location. If placed in a two or three dimensional rectangular Cartesian coordinate system, Coordinates[1] is the X coordinate, Coordinates[2] is the Y coordinate, and Coordinates[3] is the Z coordinate.	X

Formal Propositions

Rule	Description
CP2Dor3D	Only two or three dimensional points are in scope.

Inherited definitions from supertypes

Entity inheritance

Attribute inheritance

#	Attribute	Type	Cardinality	Description	G
IfcRepresentationItem
	LayerAssignment	IfcPresentationLayerAssignment @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. 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.	X
	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. IFC2x3 CHANGE The inverse attribute StyledByItem has been added.	X
IfcGeometricRepresentationItem
IfcPoint
	Dim :=IfcPointDim(SELF)	IfcDimensionCount		The space dimensionality of this abstract class, handled by a function specific for concrete subtypes. Determined by the number of coordinate components in case of IfcCartesianPoint or by the dimensionality of the basis curve or surface in other cases.	X
IfcCartesianPoint
1	Coordinates	IfcLengthMeasure	L[1:3]	The first, second, and third coordinate of the point location. If placed in a two or three dimensional rectangular Cartesian coordinate system, Coordinates[1] is the X coordinate, Coordinates[2] is the Y coordinate, and Coordinates[3] is the Z coordinate.	X

Formal representations

XML Specification

 <xs:element name="IfcCartesianPoint" type="ifc:IfcCartesianPoint" substitutionGroup="ifc:IfcPoint" nillable="true"/>

 <xs:complexType name="IfcCartesianPoint">

  <xs:complexContent>

   <xs:extension base="ifc:IfcPoint">

    <xs:attribute name="Coordinates" use="optional">

     <xs:simpleType>

      <xs:restriction>

       <xs:simpleType>

        <xs:list itemType="ifc:IfcLengthMeasure"/>

       </xs:simpleType>

       <xs:maxLength value="3"/>

      </xs:restriction>

     </xs:simpleType>

    </xs:attribute>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcCartesianPoint

 SUBTYPE OF (IfcPoint);

  Coordinates : LIST [1:3] OF IfcLengthMeasure;

 WHERE

  CP2Dor3D : HIINDEX(Coordinates) >= 2;
END_ENTITY;

 EXPRESS-G diagram

	Kartesischer Punkt
	Cartesian Point
	Point cartésien