IFCCIRCLEPROFILEDEF

IFCCIRCLEPROFILEDEF

实体定义

IFCCIRCEPROFILEDEF将圆定义为扫掠曲面几何图形或扫掠区域实体使用的轮廓定义。它由其“半径”属性给出，并放置在由“位置”属性建立的二维位置坐标系中。

IFC1.5中新实体的历史记录。

图385说明了圆轮廓定义的参数。参数化纵断面定义自己的位置坐标系。基础坐标系由使用轮廓定义的扫描曲面或扫描区域实体定义。它是以下任一项的xy平面：

IfcSweptSurface.位置

IfcSweptAreaSolid.位置

或者，对于截面脊椎，它是IfcSectionedSpine.CrossSectionPositions的每个列表成员的xy平面。通过使用位置位置的偏移，可以将参数化轮廓定位在中心位置（使用x，y偏移=0），或相对于轮廓的任何位置。显式坐标偏移用于定义基点（例如，左上界）。“位置”属性定义圆的二维位置坐标系。

“半径”属性定义圆的半径。

Attribute inheritance

#	Attribute	Type	Cardinality	Description	C
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	IfcLabel	[0:1]	Human-readable name of the profile, for example according to a standard profile table. As noted above, machine-readable standardized profile designations should be provided in IfcExternalReference.ItemReference.	X
	HasExternalReference	IfcExternalReferenceRelationship @RelatedResourceObjects	S[0:?]	Reference to external information, e.g. library, classification, or document information, which is associated with the profile.	X
	HasProperties	IfcProfileProperties @ProfileDefinition	S[0:?]	Additional properties of the profile, for example mechanical properties.	X
IfcParameterizedProfileDef
3	Position	IfcAxis2Placement2D	[0:1]	Position coordinate system of the parameterized profile definition. If unspecified, no translation and no rotation is applied.	X
IfcCircleProfileDef
4	Radius	IfcPositiveLengthMeasure	[1:1]	The radius of the circle.	X

 

EXPRESS Specification

ENTITY IfcCircleProfileDef
 SUPERTYPE OF(IfcCircleHollowProfileDef)
 SUBTYPE OF (IfcParameterizedProfileDef);
  Radius : IfcPositiveLengthMeasure;
END_ENTITY;

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