Struct CubicOffset

pub struct CubicOffset {
    c: CubicBez,
    q: QuadBez,
    d: f64,
    c0: f64,
    c1: f64,
    c2: f64,
}

The offset curve of a cubic Bézier.

This is a representation of the offset curve of a cubic Bézier segment, for purposes of curve fitting.

See the module-level documentation for a bit more discussion of the approach, and how this struct is to be used.

Fields

c: CubicBez

Source curve.

q: QuadBez

Derivative of source curve.

d: f64

Offset.

c0: f64

c1: f64

c2: f64

Implementations

impl CubicOffset

pub fn new(c: CubicBez, d: f64) -> Self

Create a new curve from Bézier segment and offset.

This method should only be used if the Bézier is smooth. Use new_regularized instead to deal with a wider range of inputs.

pub fn new_regularized(c: CubicBez, d: f64, dimension: f64) -> Self

Create a new curve from Bézier segment and offset, with numerical robustness tweaks.

The dimension represents a minimum feature size; the regularization is allowed to perturb the curve by this amount in order to improve the robustness.

fn eval_offset(&self, t: f64) -> Vec2

fn eval(&self, t: f64) -> Point

fn eval_deriv(&self, t: f64) -> Vec2

Evaluate derivative of curve.

fn cusp_sign(&self, t: f64) -> f64

Trait Implementations

impl ParamCurveFit for CubicOffset

fn sample_pt_tangent(&self, t: f64, sign: f64) -> CurveFitSample

Evaluate the curve and its tangent at parameter t.

fn sample_pt_deriv(&self, t: f64) -> (Point, Vec2)

Evaluate the point and derivative at parameter t.

fn break_cusp(&self, range: Range<f64>) -> Option<f64>

Find a cusp or corner within the given range.

fn moment_integrals(&self, range: Range<f64>) -> (f64, f64, f64)

Compute moment integrals.