Enum CurveMeasure 

pub enum CurveMeasure {
    Length(f64),
    Parameter(f64),
}

A length along a curve, or a parameter in its own space.

IfcCurveMeasureSelect admits either, and the two are not interchangeable: a length is in the model’s length unit, a parameter is in whatever the curve’s own parameterisation uses. Writing one where the other is meant rescales the segment.

IFC4X3 ADD2 declares the SELECT’s members exactly:

TYPE IfcCurveMeasureSelect = SELECT (IfcLengthMeasure, IfcParameterValue);

so a length is written IFCLENGTHMEASURE(..) and a parameter IFCPARAMETERVALUE(..). A specialisation of a member, such as IfcNonNegativeLengthMeasure, is not itself a member and is never written (#210).

Variants

Length(f64)

IfcLengthMeasure: a signed distance along the curve.

Parameter(f64)

IfcParameterValue: a value in the curve’s parameter space.

Trait Implementations

impl Clone for CurveMeasure

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for CurveMeasure

impl Debug for CurveMeasure

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.