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IfcEllipseProfileDef

Definition from IAI: The IfcEllipseProfileDef defines an ellipse as the profile definition used used by the swept surface geometry or the swept area solid. It is given by its semi axis attributes and placed within the 2D position coordinate system, established by the Position attribute.

HISTORY: New class in IFC Release 2x
ISSUE: See issue and change log for changes made in IFC Release 2x.
ILLUSTRATION:
ellipse profile

Position
The Position attribute defines the 2D position coordinate system of the ellipse.

Parameter
The location of the position coordinate system defines the center of the ellipse. The SemiAxis1 attribute defines the first radius of the ellipse in the direction of the x axis, the SemiAxis2 attribute defines the second radius of the ellipse in the direction of the y axis.
Table: Parameter for ellipse profile definition
NOTE: The semi axes of the ellipse are rectangular to each other by definition.

EXPRESS specification:

ENTITY IfcEllipseProfileDef
SUBTYPE OF ( IfcProfileDef);
Position  :  IfcAxis2Placement2D;
SemiAxis1  :  IfcPositiveLengthMeasure;
SemiAxis2  :  IfcPositiveLengthMeasure;
END_ENTITY;

Attribute definitions:

Position  :  Position coordinate system of the ellipse profile definition.
SemiAxis1  :  The first radius of the ellipse. It is measured along the direction of Position.P[1].
SemiAxis2  :  The second radius of the ellipse. It is measured along the direction of Position.P[2].

References (1):

Name Type Referred through Express-G
IfcProfileDef Entity
Subtype
Diagram 1

Inheritance graph

ENTITY IfcEllipseProfileDef;
ENTITY IfcProfileDef;
ProfileType  :  IfcProfileTypeEnum;
ProfileName  :  OPTIONAL IfcLabel;
ENTITY IfcEllipseProfileDef;
Position  :  IfcAxis2Placement2D;
SemiAxis1  :  IfcPositiveLengthMeasure;
SemiAxis2  :  IfcPositiveLengthMeasure;
END_ENTITY;