Struct Offset2d 

pub struct Offset2d { /* private fields */ }

A planar curve displaced a constant signed distance along its basis’s left normal (the tangent turned a quarter left), sharing the basis’s parameterization.

Point and first derivative are exact from the basis’s first and second derivatives; the second would need the basis’s third, which the vocabulary does not carry, so d2_at refuses by name. Where the basis’s tangent vanishes the offset direction is undefined and evaluation refuses.

Implementations

impl Offset2d

pub fn new(basis: PlanarCurve, distance: f64) -> OgeomResult<Self>

Offset basis by a signed distance along its left normal.

Errors

OgeomError::Construction if the distance is not finite and non-zero.

pub const fn basis(&self) -> &PlanarCurve

The curve being offset.

pub const fn distance(&self) -> f64

The signed displacement along the left normal.

Trait Implementations

impl Clone for Offset2d

fn clone(&self) -> Offset2d

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Curve2d for Offset2d

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_closed(&self, tol: Tolerances) -> bool

Whether the curve’s ends meet.

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 Offset2d

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

Formats the value using the given formatter.

impl PartialEq for Offset2d

fn eq(&self, other: &Offset2d) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Offset2d