Struct ChainPositionTable 

pub struct ChainPositionTable { /* private fields */ }

Certified positions, unit tangents and curvature vectors of an arc-length chain over [0, end], read in any order; see the module documentation.

Implementations

impl ChainPositionTable

pub fn new(chain: &Chain2, error: f64, end: f64) -> Option<ChainPositionTable>

The table over [0, end], its points within about error; None for a malformed chain (or a parametric piece off its local frame), an error or end that is not finite and positive, an end past the chain, an intrinsic piece whose law has no closed-form bound of k to k''', a parametric piece of a family other than a line, a circle, an ellipse or a B-spline, a piece longer than its curve, a curve without a positive speed floor on a panel, or a budget exhausted.

pub fn point2(&self, s: f64) -> Option<(DVec2, f64)>

The point at arc length s as the evaluator reads it (a join belongs to the piece that starts there), and a certified bound on its distance from the exact point. None outside [0, end], or where a piece refuses the read.

pub fn point2_on(&self, s: f64, side: SeamSide) -> Option<(DVec2, f64)>

Self::point2 on side of a join.

pub fn tangent2_on(&self, s: f64, side: SeamSide) -> Option<(DVec2, f64)>

The tangent at s on side, and a certified bound on its distance from the exact tangent.

pub fn curvature2_on(&self, s: f64, side: SeamSide) -> Option<(DVec2, f64)>

p''(s) in arc length (k n) on side, and a certified bound on its distance from the exact one. Where a piece’s curvature law has a seam inside, the value is the left one, as the evaluator reads it.

pub fn max_error(&self) -> f64

A certified bound on the error of every point the table returns.

pub fn max_tangent_error(&self) -> f64

A certified bound on the error of every tangent the table returns.

pub fn max_curvature_error(&self) -> f64

A certified bound on the error of every curvature vector the table returns.

Trait Implementations

impl Clone for ChainPositionTable

fn clone(&self) -> ChainPositionTable

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChainPositionTable

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

Formats the value using the given formatter.