|modifications||attributes Scale2 definition||Changed from real to IfcReal|
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:
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.
|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.
|1||Axis1||OPTIONAL IfcDirection||The direction used to determine U, the derived X axis direction.|
|2||Axis2||OPTIONAL IfcDirection||The direction used to determine U, the derived Y axis direction.|
|3||LocalOrigin||IfcCartesianPoint||The required translation, specified as a cartesian point. The actual translation included in the transformation is from the geometric origin to the local origin.|
|4||Scale||OPTIONAL IfcReal||The scaling value specified for the transformation.|
|Scl||INVALID||The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise.|
|Dim||INVALID||The space dimensionality of this class, determined by the space dimensionality of the local origin.|
|U||INVALID||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.|
|5||Scale2||OPTIONAL IfcReal||The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.|
|Scl2||INVALID||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.|
ENTITY IfcCartesianTransformationOperator2DnonUniform SUBTYPE OF (IfcCartesianTransformationOperator2D); Scale2 : OPTIONAL IfcReal; DERIVE Scl2 : IfcReal := NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl); WHERE Scale2GreaterZero : Scl2 > 0.0; END_ENTITY;