Struct FixedRing 

pub struct FixedRing<const N: usize> { /* private fields */ }

A fixed-capacity closed ring backed by an inline array.

The ring is implicitly closed: the edge from vertices[len-1] back to vertices[0] is always present when the ring has 3+ vertices.

Implementations

impl<const N: usize> FixedRing<N>

pub fn new() -> Self

Creates an empty FixedRing.

pub fn push(&mut self, p: Point2D) -> Result<(), NoAllocError>

Attempts to append a vertex. Returns Ok(()) on success or Err(NoAllocError::CapacityExceeded) if the ring is full.

pub fn len(&self) -> usize

Returns the number of vertices.

pub fn is_empty(&self) -> bool

Returns true if the ring has no vertices.

pub fn vertices(&self) -> &[Point2D]

Returns a slice of the current vertices.

pub fn get(&self, index: usize) -> Option<&Point2D>

Returns the vertex at the given index, or None if out of bounds.

pub fn signed_area(&self) -> f64

Computes the signed area using the shoelace formula.

Positive for counter-clockwise winding, negative for clockwise. Returns 0.0 if the ring has fewer than 3 vertices.

pub fn area(&self) -> f64

Computes the absolute area using the shoelace formula.

pub fn is_counter_clockwise(&self) -> bool

Returns true if the ring’s vertices are ordered counter-clockwise.

A ring with fewer than 3 vertices is considered neither CW nor CCW and returns false.

pub fn is_clockwise(&self) -> bool

Returns true if the ring’s vertices are ordered clockwise.

pub fn contains_point(&self, p: Point2D) -> bool

Tests whether a point lies inside or on the boundary of the ring using the ray-casting algorithm.

A horizontal ray from the point toward +X is tested against each edge of the ring. An odd number of crossings means the point is inside.

Returns false for rings with fewer than 3 vertices.

pub fn perimeter(&self) -> f64

Computes the perimeter (sum of edge lengths including the closing edge).

Returns 0.0 for rings with fewer than 2 vertices.

pub const fn capacity(&self) -> usize

Returns the capacity of this ring.

pub fn clear(&mut self)

Clears all vertices, resetting the length to zero.

Trait Implementations

impl<const N: usize> Default for FixedRing<N>

fn default() -> Self

Returns the “default value” for a type.