axiolid_curve/
spline.rs

1//! B-spline and rational B-spline curve data.
2
3use axiolid_core::{Point2, Point3, Scalar};
4
5/// How the knot vector was specified by the source representation.
6#[non_exhaustive]
7#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
8pub enum KnotSpec {
9    /// Uniform spacing, not necessarily clamped.
10    Uniform,
11    /// Quasi-uniform spacing with clamped ends.
12    QuasiUniform,
13    /// Piecewise Bezier knot multiplicities.
14    PiecewiseBezier,
15    /// Explicit knots and multiplicities.
16    Unspecified,
17}
18
19/// Exact B-spline data. Rational curves carry one weight per control point.
20#[derive(Debug, Clone, PartialEq)]
21pub struct BSplineCurve<P> {
22    /// Polynomial degree.
23    pub degree: u16,
24    /// Ordered control points.
25    pub control_points: Vec<P>,
26    /// Distinct knot values.
27    pub knots: Vec<Scalar>,
28    /// Multiplicity for each distinct knot.
29    pub multiplicities: Vec<u32>,
30    /// Optional rational weights, one per control point.
31    pub weights: Option<Vec<Scalar>>,
32    /// Whether the source declares the curve closed.
33    pub closed: bool,
34    /// Whether the source declares self intersection.
35    pub self_intersect: Option<bool>,
36    /// Source knot convention.
37    pub knot_spec: KnotSpec,
38}
39
40/// Two-dimensional B-spline curve.
41pub type BSplineCurve2 = BSplineCurve<Point2>;
42/// Three-dimensional B-spline curve.
43pub type BSplineCurve3 = BSplineCurve<Point3>;
axiolid_curve/spline.rs

axiolid_curve/
spline.rs
