Struct Chain2 

pub struct Chain2 {
    pub start: Frame2,
    pub pieces: Vec<ChainPiece2>,
}

A plane curve parameterised by cumulative arc length, its pieces placed rigidly end to end. See the module documentation.

Dirty imported data stays representable, as everywhere else in this crate: Self::is_well_formed names what an evaluator refuses structurally.

Fields

start: Frame2

Start frame: origin at the chain start, x along the start tangent.

pieces: Vec<ChainPiece2>

Pieces in order of travel.

Implementations

impl Chain2

pub const fn new(start: Frame2, pieces: Vec<ChainPiece2>) -> Chain2

A chain of pieces starting at start.

pub fn is_well_formed(&self) -> bool

Whether the chain is structurally sound: at least one piece, a finite start frame with independent axes, every length finite and positive, every curvature law well formed, every parametric start finite.

Whether a parametric piece’s curve has length of arc after start needs a quadrature, so it is an evaluator’s check, not this one.

pub fn length(&self) -> Option<f64>

Total arc length: the sum of the piece lengths, None when one is not finite and positive.

pub fn joins(&self) -> Option<Vec<f64>>

Arc length at each interior join, ascending: where piece i + 1 begins. Empty for one piece; None when a length is not finite and positive.

pub fn piece_at(&self, s: f64) -> Option<(usize, &ChainPiece2, f64)>

The piece covering arc length s, its index, and s rebased to the piece start.

Pieces are half-open, so a join belongs to the piece that starts there; the last piece is closed at the chain end. None outside [0, length], for a non-finite s and for a malformed length.

Trait Implementations

impl Clone for Chain2

fn clone(&self) -> Chain2

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Chain2

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Chain2

fn deserialize<__D>( __deserializer: __D, ) -> Result<Chain2, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Chain2

fn eq(&self, other: &Chain2) -> bool

Equality operator ==.

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

Inequality operator !=.

impl Serialize for Chain2

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Chain2