IfcBSplineCurveForm

Natural language names
BSpline Curve Form
Forme de courbe Bspline
Semantic definitions at the type
Type definition

The IfcBSplineCurveForm represents a part of a curve of some sppecific form.

NOTE  Definition according to ISO/CD 10303-42:1992
This type is used to indicate that the B-spline curve represents a part of a curve of some specific form.

NOTE  Type adapted from b_spline_curve_form defined in ISO 10303-42.

HISTORY  New type in IFC2x2.

Enumeration definition
ConstantDescription
POLYLINE_FORMA connected sequence of line segments represented by degree 1 B-spline basis functions.
CIRCULAR_ARCAn arc of a circle, or a complete circle represented by a B-spline curve.
ELLIPTIC_ARCAn arc of an ellipse, or a complete ellipse, represented by a B-spline curve.
PARABOLIC_ARCAn arc of finite length of a parabola represented by a B-spline curve.
HYPERBOLIC_ARCAn arc of finite length of one branch of a hyperbola represented by a B-spline curve.
UNSPECIFIEDA B-spline curve for which no particular form is specified.
Formal representations
XML Specification
 <xs:simpleType name="IfcBSplineCurveForm">
  <xs:restriction base="xs:string">
   <xs:enumeration value="polyline_form"/>
   <xs:enumeration value="circular_arc"/>
   <xs:enumeration value="elliptic_arc"/>
   <xs:enumeration value="parabolic_arc"/>
   <xs:enumeration value="hyperbolic_arc"/>
   <xs:enumeration value="unspecified"/>
  </xs:restriction>
 </xs:simpleType>
EXPRESS Specification
TYPE IfcBSplineCurveForm = ENUMERATION OF (
 POLYLINE_FORM,
 CIRCULAR_ARC,
 ELLIPTIC_ARC,
 PARABOLIC_ARC,
 HYPERBOLIC_ARC,
 UNSPECIFIED);
END_TYPE;

Link to EXPRESS-G diagram EXPRESS-G diagram

References  References: IfcBSplineCurve

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