Struct CurveDist 

struct CurveDist {
    samples: ArrayVec<CurveFitSample, N_SAMPLE>,
    arcparams: ArrayVec<f64, N_SAMPLE>,
    range: Range<f64>,
    spicy: bool,
}

An acceleration structure for estimating curve distance

Fields

samples: ArrayVec<CurveFitSample, N_SAMPLE>

arcparams: ArrayVec<f64, N_SAMPLE>

range: Range<f64>

spicy: bool

A “spicy” curve is one with potentially extreme curvature variation, so use arc length measurement for better accuracy.

Implementations

impl CurveDist

fn from_curve(source: &impl ParamCurveFit, range: Range<f64>) -> Self

fn compute_arc_params(&mut self, source: &impl ParamCurveFit)

fn eval_arc(&self, c: CubicBez, acc2: f64) -> Option<f64>

Evaluate distance based on arc length parametrization

fn eval_ray(&self, c: CubicBez, acc2: f64) -> Option<f64>

Evaluate distance to a cubic approximation.

If distance exceeds stated accuracy, can return None. Note that acc2 is the square of the target.

Returns the square of the error, which is intended to be a good approximation of the Fréchet distance.

fn eval_dist( &mut self, source: &impl ParamCurveFit, c: CubicBez, acc2: f64, ) -> Option<f64>