8.9.3.15 IfcCartesianTransformationOperator2DnonUniform

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8.9.3.15.1 Semantic 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).

8.9.3.15.2 Entity inheritance

8.9.3.15.3 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)

Axis1

OPTIONAL IfcDirection

The direction used to determine U[1], the derived X axis direction.

Axis2

OPTIONAL IfcDirection

The direction used to determine U[2], the derived Y axis direction.

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.

Scale

OPTIONAL IfcReal

The scaling value specified for the transformation.

Scl

IfcReal

This attribute is formally derived.

NVL(Scale, 1.0)

The derived scale S of the transformation, equal to scale if that exists, or 1.0 otherwise.

Dim

IfcDimensionCount

This attribute is formally derived.

LocalOrigin.Dim

The space dimensionality of this class, determined by the space dimensionality of the local origin.

IfcCartesianTransformationOperator2D (1)

LIST [2:2] OF IfcDirection

This attribute is formally derived.

 IfcBaseAxis(2,SELF\IfcCartesianTransformationOperator.Axis1,
SELF\IfcCartesianTransformationOperator.Axis2,?)

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.

Click to show 9 hidden inherited attributes

IfcCartesianTransformationOperator2DnonUniform (2)

Scale2

OPTIONAL IfcReal

The scaling value specified for the transformation along the axis 2. This is normally the y scale factor.

Scl2

IfcReal

This attribute is formally derived.

NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl)

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.

Table 8.9.3.15.A

8.9.3.15.4 Formal propositions

Name	Description
Scale2GreaterZero	The derived scaling Scl2 shall be greater than zero.
`Scl2 > 0.0`

Table 8.9.3.15.B

8.9.3.15.5 Formal representation

 ENTITY IfcCartesianTransformationOperator2DnonUniform
 SUBTYPE OF (IfcCartesianTransformationOperator2D);
	Scale2 : OPTIONAL IfcReal;
 DERIVE
	 Scl2 : IfcReal := NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl);
 WHERE
	Scale2GreaterZero : Scl2 > 0.0;
END_ENTITY;

8.9.3.15 IfcCartesianTransformationOperator2DnonUniform

8.9.3.15.1 Semantic definition

8.9.3.15.2 Entity inheritance

8.9.3.15.3 Attributes

8.9.3.15.4 Formal propositions

8.9.3.15.5 Formal representation

8.9.3.15.6 Changelog

8.9.3.15.6.1 IFC4

	ENTITY IfcCartesianTransformationOperator2DnonUniform
	SUBTYPE OF (IfcCartesianTransformationOperator2D);
	Scale2 : OPTIONAL IfcReal;
	DERIVE
	Scl2 : IfcReal := NVL(Scale2, SELF\IfcCartesianTransformationOperator.Scl);
	WHERE
	Scale2GreaterZero : Scl2 > 0.0;
	END_ENTITY;