IfcCartesianTransformationOperator2DnonUniform

Item	Change	Description
IFC4 to IFC4 ADD1
IfcCartesianTransformationOperator2DnonUniform
Scale	MODIFIED	Type changed from REAL to IfcReal.
Scale2	MODIFIED	Type changed from REAL to IfcReal.

Semantic definitions at the entity

Entity definition

A Cartesian transformation operator 2d non uniform defines a geometric transformation in two-dimensional space composed of translation, rotation, mirroring and non uniform scaling. Non uniform scaling is given by two different scaling factors:

SELF\IfcCartesianTransformationOperator.Scale: the x axis scale factor
Scale2: the y axis scale factor

If the Scale factor (at supertype IfcCartesianTransformationOperator) is omitted, it defaults to 1.0. If the Scale2 factor is omitted, it defaults to the value of Scale (the x axis scale factor).

NOTE The scale factor (Scl) defined at the supertype IfcCartesianTransformationOperator is used to express the calculated Scale factor (normally x axis scale factor).

HISTORY New entity in IFC2x.

Attribute definitions

#	Attribute	Type	Cardinality	Description	B
5	Scale2	IfcReal	[0:1]	The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.	X
	Scl2 :=NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl)	IfcReal	[1:1]	The derived scale S(2) of the transformation along the axis 2 (normally the y axis), equal to Scale2 if that exists, or equal to the derived Scl1 (normally the x axis scale factor) otherwise.	X

Formal Propositions

Rule	Description
Scale2GreaterZero	The derived scaling Scl2 shall be greater than zero.

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
IfcCartesianTransformationOperator
1	Axis1	IfcDirection	[0:1]	The direction used to determine U[1], the derived X axis direction.	X
2	Axis2	IfcDirection	[0:1]	The direction used to determine U[2], the derived Y axis direction.	X
3	LocalOrigin	IfcCartesianPoint	[1:1]	The required translation, specified as a cartesian point. The actual translation included in the transformation is from the geometric origin to the local origin.	X
4	Scale	IfcReal	[0:1]	The scaling value specified for the transformation.	X
	Scl :=NVL(Scale, 1.0)	IfcReal	[1:1]	The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise.	X
	Dim :=LocalOrigin.Dim	IfcDimensionCount	[1:1]	The space dimensionality of this class, determined by the space dimensionality of the local origin.	X
IfcCartesianTransformationOperator2D
	U :=IfcBaseAxis(2,SELF\IfcCartesianTransformationOperator.Axis1, SELF\IfcCartesianTransformationOperator.Axis2,?)	IfcDirection	L[2:2]	The list of mutually orthogonal, normalized vectors defining the transformation matrix T. They are derived from the explicit attributes Axis1 and Axis2 in that order.	X
IfcCartesianTransformationOperator2DnonUniform
5	Scale2	IfcReal	[0:1]	The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.	X
	Scl2 :=NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl)	IfcReal	[1:1]	The derived scale S(2) of the transformation along the axis 2 (normally the y axis), equal to Scale2 if that exists, or equal to the derived Scl1 (normally the x axis scale factor) otherwise.	X

Formal representations

XSD Specification

 <xs:element name="IfcCartesianTransformationOperator2DnonUniform" type="ifc:IfcCartesianTransformationOperator2DnonUniform" substitutionGroup="ifc:IfcCartesianTransformationOperator2D" nillable="true"/>

 <xs:complexType name="IfcCartesianTransformationOperator2DnonUniform">

  <xs:complexContent>

   <xs:extension base="ifc:IfcCartesianTransformationOperator2D">

    <xs:attribute name="Scale2" type="ifc:IfcReal" use="optional"/>

   </xs:extension>

  </xs:complexContent>

 </xs:complexType>

EXPRESS Specification


ENTITY IfcCartesianTransformationOperator2DnonUniform

 SUBTYPE OF (IfcCartesianTransformationOperator2D);

  Scale2 : OPTIONAL IfcReal;

 DERIVE

  Scl2 : IfcReal := NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl);

 WHERE

  Scale2GreaterZero : Scl2 > 0.0;
END_ENTITY;

 EXPRESS-G diagram

	Kartesische Transformation - zweidimensional nicht gleichmäßig (2D)
	Cartesian Transformation Operator2 Dnon Uniform
	Opérateur 2D de transformation cartésienne non uniforme