8.9.3.14 IfcCartesianTransformationOperator2D
8.9.3.14.1 Semantic definition
An IfcCartesianTransformationOperator2D defines a geometric transformation in two-dimensional space.
8.9.3.14.2 Entity inheritance
-
- IfcCartesianTransformationOperator
- IfcAnnotationFillArea
- IfcBooleanResult
- IfcBoundingBox
- IfcCartesianPointList
- IfcCsgPrimitive3D
- IfcCurve
- IfcDirection
- IfcFaceBasedSurfaceModel
- IfcFillAreaStyleHatching
- IfcFillAreaStyleTiles
- IfcGeometricSet
- IfcHalfSpaceSolid
- IfcLightSource
- IfcPlacement
- IfcPlanarExtent
- IfcPoint
- IfcSectionedSpine
- IfcSegment
- IfcShellBasedSurfaceModel
- IfcSolidModel
- IfcSurface
- IfcTessellatedItem
- IfcTextLiteral
- IfcVector
8.9.3.14.3 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. |
|
| 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. |
|
| IfcCartesianTransformationOperator (6) | |||
| 1 | Axis1 | OPTIONAL IfcDirection |
The direction used to determine U[1], the derived X axis direction. |
| 2 | Axis2 | OPTIONAL IfcDirection |
The direction used to determine U[2], 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 | IfcReal |
This attribute is formally derived. The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise. |
| * | Dim | IfcDimensionCount |
This attribute is formally derived. The space dimensionality of this class, determined by the space dimensionality of the local origin. |
| Click to show 8 hidden inherited attributes Click to hide 8 inherited attributes | |||
| IfcCartesianTransformationOperator2D (1) | |||
| * | U | LIST [2:2] OF IfcDirection |
This attribute is formally derived. 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. |
8.9.3.14.4 Formal propositions
| Name | Description |
|---|---|
| Axis1Is2D |
The inherited Axis1 should have (if given) the dimensionality of 2. |
|
|
| Axis2Is2D |
The inherited Axis2 should have (if given) the dimensionality of 2. |
|
|
| DimEqual2 |
The coordinate space dimensionality of this entity shall be 2. |
|
|
8.9.3.14.5 Examples
8.9.3.14.6 Formal representation
ENTITY IfcCartesianTransformationOperator2D
SUPERTYPE OF (ONEOF
(IfcCartesianTransformationOperator2DnonUniform))
SUBTYPE OF (IfcCartesianTransformationOperator);
DERIVE
U : LIST [2:2] OF IfcDirection := IfcBaseAxis(2,SELF\IfcCartesianTransformationOperator.Axis1,
SELF\IfcCartesianTransformationOperator.Axis2,?);
WHERE
Axis1Is2D : NOT(EXISTS(SELF\IfcCartesianTransformationOperator.Axis1)) OR
(SELF\IfcCartesianTransformationOperator.Axis1.Dim = 2);
Axis2Is2D : NOT(EXISTS(SELF\IfcCartesianTransformationOperator.Axis2)) OR
(SELF\IfcCartesianTransformationOperator.Axis2.Dim = 2);
DimEqual2 : SELF\IfcCartesianTransformationOperator.Dim = 2;
END_ENTITY;