#### IfcCircleProfileDef

Natural language names

##### Semantic definitions at the entity

Entity definition

Definition from IAI: The IfcCircleProfileDef defines a circle as the profile definition used by the swept surface geometry or by the swept area solid. It is given by its Radius attribute and placed within the 2D position coordinate system, established by the Position attribute.

> HISTORY: New class in IFC Release 1.5.

Illustration:

| Position The parameterized profile defines its own position coordinate system. The underlying coordinate system is 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. By using offsets of the position location, the parameterized profile can be positioned centric (using x,y offsets = 0.), or at any position relative to the profile. Explicit coordinate offsets are used to define cardinal points (e.g. upper-left bound). Parameter The Position attribute defines the 2D position coordinate system of the circle. The Radius attribute defines the radius of the circle.

Table: Parameter for circle profile definition

Attribute definitions

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
4 | Radius | IfcPositiveLengthMeasure | [1:1] | The radius of the circle. | X

##### Inherited definitions from supertypes

Entity inheritance
Attribute inheritance

# | Attribute | Type | Cardinality | Description | A
--- | --- | --- | --- | --- | ---
IfcProfileDef
1 | ProfileType | IfcProfileTypeEnum | [1:1] | Defines the type of geometry into which this profile definition shall be resolved, either a curve or a surface area. In case of curve the profile should be referenced by a swept surface, in case of area the profile should be referenced by a swept area solid. | X
2 | ProfileName | - |  | This attribute is out of scope for this model view definition and shall not be set. |
IfcParameterizedProfileDef
3 | Position | IfcAxis2Placement2D | [1:1] | Position coordinate system of the parameterized profile definition. | X
IfcCircleProfileDef
4 | Radius | IfcPositiveLengthMeasure | [1:1] | The radius of the circle. | X

##### Formal representations

XSD Specification
`<xs:element name="IfcCircleProfileDef" type="ifc:IfcCircleProfileDef" substitutionGroup="ifc:IfcParameterizedProfileDef" nillable="true"/>
<xs:complexType name="IfcCircleProfileDef">
<xs:complexContent>
<xs:extension base="ifc:IfcParameterizedProfileDef">
<xs:attribute name="Radius" type="ifc:IfcPositiveLengthMeasure" use="optional"/>
</xs:extension>
</xs:complexContent>
</xs:complexType>
`
EXPRESS Specification
`ENTITY IfcCircleProfileDef
SUPERTYPE OF(IfcCircleHollowProfileDef)
SUBTYPE OF (IfcParameterizedProfileDef);
Radius : IfcPositiveLengthMeasure;
END_ENTITY;

EXPRESS-G diagram

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