IfcBSplineCurveForm

类型定义

IfcBSplineCurveForm表示某些特定形式的曲线的一部分。

注：定义符合ISO/CD 10303-42:1992

此类型用于指示B样条曲线代表某种特定形式的曲线的一部分。

注：类型改编自ISO 10303-42中定义的b_spline_curve_form。

IFC2x2中的新类型。

Enumeration definition

Constant	Description
POLYLINE_FORM	A connected sequence of line segments represented by degree 1 B-spline basis functions.
CIRCULAR_ARC	An arc of a circle, or a complete circle represented by a B-spline curve.
ELLIPTIC_ARC	An arc of an ellipse, or a complete ellipse, represented by a B-spline curve.
PARABOLIC_ARC	An arc of finite length of a parabola represented by a B-spline curve.
HYPERBOLIC_ARC	An arc of finite length of one branch of a hyperbola represented by a B-spline curve.
UNSPECIFIED	A B-spline curve for which no particular form is specified.

EXPRESS Specification

TYPE IfcBSplineCurveForm = ENUMERATION OF (
 POLYLINE_FORM,
 CIRCULAR_ARC,
 ELLIPTIC_ARC,
 PARABOLIC_ARC,
 HYPERBOLIC_ARC,
 UNSPECIFIED);
END_TYPE;

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标签：IfcBSplineCurveForm,curve,ARC,arc,represented,spline
From： https://www.cnblogs.com/herd/p/16722900.html