Class Ifc4::IfcDerivedProfileDef

Nested Relationships

This class is a nested type of Struct Ifc4.

Inheritance Relationships

Base Type

Derived Type

Class Documentation

class Ifc4::IfcDerivedProfileDef : public Ifc4::IfcProfileDef

IfcDerivedProfileDef defines the profile by transformation from the parent profile. The transformation is given by a two dimensional transformation operator. Transformation includes translation, rotation, mirror and scaling. The latter can be uniform or non uniform. The derived profiles may be used to define swept surfaces, swept area solids or sectioned spines.

The transformation effects the position, rotation, mirroring or scale of the profile at the underlying coordinate system, i.e. the coordinate system defined by the swept surface or swept area solid that uses the profile definition. It is the xy plane of either:

IfcSweptSurface.Position IfcSweptAreaSolid.Position

or in case of sectioned spines the xy plane of each list member of IfcSectionedSpine.CrossSectionPositions. The position and potential rotation of the ParentProfile within the underlying coordinate system is taken into consideration before applying the Cartesian transformation operator.

Note, if only mirroring is required, IfcMirroredProfileDef should be used instead.

HISTORY: New entity in IFC Release 2x.

Figure 316 illustrates examples of derived profiles.

Parameter The IfcDerivedProfileDef is defined using the IfcCartesianTransformationOperator2D (CTO), which is applied to the parent profile definition.

Example The example shows an uniform scaling and a transformation of an IfcRectangleProfileDef to match the lower-left cardinal point. The attributes of the CTO are:

Axis1 = NIL (defaults to 1.,0.) Axis2 = NIL (defaults to 0.,1.) LocalOrigin = IfcCartesianPoint(,) Scale = 2.

Note: The ParentProfile has a Position = IfcCartesianPoint(,) already.

Parameter The IfcDerivedProfileDef is defined using non uniform transformationsby applying the IfcCartesianTransformationOperator2DnonUniform as a subtype of the 2D CTO.

Example The example shows a non-uniform scaling and a translation of an IfcRectangleProfileDef to match the lower-left cardinal point. The attributes of the CTO are:

Axis1 = NIL (defaults to 1.,0.) Axis2 = NIL (defaults to 0.,1.) LocalOrigin = IfcCartesianPoint(0.,<1/2 YDim) Scale = 1. Scale2 = 2.

Note: The ParentProfile has a Position = IfcCartesianPoint(,) already.

Parameter The IfcDerivedProfileDef is defined using mirroring by applying the IfcCartesianTransformationOperator2D (CTO) to the parent profile.

Example The example shows a mirroring of an IfcLShapeProfileDef to match the centre cardinal point. The attributes of the CTO are:

Axis1 = (-1.,0.) Axis2 = NIL (defaults to 0.,1.) LocalOrigin = IfcCartesianPoint(0.,0.) Scale = NIL (defaults to 1.)

Note: The ParentProfile has a Position = IfcCartesianPoint(0.,0.).

This example is for illustration only. If the transformation results only in mirroring like shown in the example, then IfcMirroredProfileDef should be used instead of IfcDerivedProfileDef.

Note: The following color map applies:

black coordinate axes show the underlying coordinate system of the swept surface, swept area solid, or sectioned spine

red coordinate axes show the position coordinate system of the parent profile

brown coordinate axes show the position coordinate system of the derived profile

Figure 316 — Derived profile

Subclassed by Ifc4::IfcMirroredProfileDef

Public Types

typedef IfcTemplatedEntityList<IfcDerivedProfileDef> list

Public Functions

::Ifc4::IfcProfileDef *ParentProfile() const

The parent profile provides the origin of the transformation.

void setParentProfile(::Ifc4::IfcProfileDef *v)
::Ifc4::IfcCartesianTransformationOperator2D *Operator() const

Transformation operator applied to the parent profile.

void setOperator(::Ifc4::IfcCartesianTransformationOperator2D *v)
bool hasLabel() const

Whether the optional attribute Label is defined for this IfcDerivedProfileDef.

std::string Label() const

The name by which the transformation may be referred to. The actual meaning of the name has to be defined in the context of applications.

void setLabel(std::string v)
const IfcParse::entity &declaration() const
IfcDerivedProfileDef(IfcEntityInstanceData *e)
IfcDerivedProfileDef(::Ifc4::IfcProfileTypeEnum::Value v1_ProfileType, boost::optional<std::string> v2_ProfileName, ::Ifc4::IfcProfileDef *v3_ParentProfile, ::Ifc4::IfcCartesianTransformationOperator2D *v4_Operator, boost::optional<std::string> v5_Label)

Public Static Functions

const IfcParse::entity &Class()