Struct BSpline2d 

pub struct BSpline2d { /* private fields */ }

A B-spline in the plane, polynomial or rational.

Implementations

impl BSpline2d

pub fn new( knots: KnotVector, control: Vec<Point2>, tol: Tolerances, ) -> OgeomResult<Self>

A polynomial B-spline.

Errors

OgeomError::Dimension on a shape mismatch.

pub fn rational( knots: KnotVector, control: Vec<Weighted<Point2>>, ) -> OgeomResult<Self>

A rational B-spline.

Errors

OgeomError::Dimension on a shape mismatch.

pub const fn knots(&self) -> &KnotVector

The knot vector.

pub fn control_points(&self) -> &[Weighted<Point2>]

The weighted control points.

pub const fn is_rational(&self) -> bool

Whether the weights differ.

pub fn reseamed_at( &self, u: f64, lap: Vector2, tol: Tolerances, ) -> OgeomResult<Self>

The same closed image with its seam moved to u: what was the stretch from u to the end now comes first, and the stretch from the start to u follows it, carried by lap so that it continues from the end. lap is how far the end stands from the start: zero for a loop closed in the plane, a whole period for an image winding once round a periodic chart. The domain keeps its length and begins at u, so the image at a parameter past the old end is the old image a domain’s length earlier, moved by lap.

Errors

OgeomError::Construction if the end stands further than the parametric tolerance from the start carried by lap; as bspline::split if u is an end of the domain.

Trait Implementations

impl Clone for BSpline2d

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Curve2d for BSpline2d

fn is_closed(&self, tol: Tolerances) -> bool

Where its ends meet, which its end control points say only for clamped knots.

fn domain(&self) -> (f64, f64)

The parameter interval over which the curve is defined.

fn point_at(&self, u: f64, tol: Tolerances) -> OgeomResult<Point2>

The point at u.

fn d1_at(&self, u: f64, tol: Tolerances) -> OgeomResult<Vector2>

The first derivative at u.

fn derivatives_at( &self, u: f64, n: usize, tol: Tolerances, ) -> OgeomResult<Vec<Vector2>>

Derivatives up to order n, with result[0] the point itself.

fn kind(&self) -> CurveKind

What kind of curve this is.

fn is_periodic(&self) -> bool

Whether the curve continues past its domain by repeating.

fn start(&self, tol: Tolerances) -> OgeomResult<Point2>

The start point.

fn end(&self, tol: Tolerances) -> OgeomResult<Point2>

The end point.

impl Debug for BSpline2d

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

Formats the value using the given formatter.

impl From<BSpline2d> for PlanarCurve

fn from(c: BSpline2d) -> Self

Converts to this type from the input type.

impl PartialEq for BSpline2d

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for BSpline2d