Struct NurbsKnotVector 

pub struct NurbsKnotVector {
    pub knots: Vec<f64>,
}

Non-uniform knot vector for a NURBS curve or surface.

A valid knot vector is non-decreasing: t[0] ≤ t[1] ≤ … ≤ t[m].

Fields

knots: Vec<f64>

Knot values.

Implementations

impl NurbsKnotVector

pub fn new(knots: Vec<f64>) -> Self

Construct a knot vector from an explicit list.

Panics

Panics if the sequence is not non-decreasing.

pub fn clamped_uniform(n_ctrl: usize, degree: usize) -> Self

Build a clamped uniform knot vector for n+1 control points and degree p.

The first and last knots are repeated p+1 times; interior knots are uniform.

pub fn uniform(n_ctrl: usize, degree: usize) -> Self

Build a periodic (uniform) knot vector for n+1 control points and degree p.

pub fn len(&self) -> usize

Number of knots.

pub fn is_empty(&self) -> bool

Check if the knot vector is empty.

pub fn find_span(&self, t: f64, degree: usize, n_ctrl: usize) -> usize

Find the knot span index i such that knots[i] ≤ t < knots[i+1].

Uses binary search. At the right end of the domain returns the last non-zero-length span.

pub fn domain_start(&self, degree: usize) -> f64

Domain start (first non-clamped knot value).

pub fn domain_end(&self, _degree: usize, n_ctrl: usize) -> f64

Domain end (last non-clamped knot value).

pub fn multiplicity(&self, t: f64) -> usize

Multiplicity of knot value t (within tolerance ε).

pub fn insert_knot(&self, t_new: f64) -> Self

Insert a new knot value and return the new knot vector.

Trait Implementations

impl Clone for NurbsKnotVector

fn clone(&self) -> NurbsKnotVector

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for NurbsKnotVector

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

Formats the value using the given formatter.