Struct Arc 

pub struct Arc {
    pub center: Point,
    pub radius: f64,
    pub start: f64,
    pub sweep: f64,
}

A circular arc: center + radius·(cos θ, sin θ) for θ = start + sweep·t, t ∈ [0, 1].

sweep > 0 is counter-clockwise. |sweep| ≤ 2π.

Fields

center: Point

Center.

radius: f64

Radius (> 0).

start: f64

Start angle in radians.

sweep: f64

Signed sweep in radians.

Implementations

impl Arc

pub fn new( center: Point, radius: f64, start: f64, sweep: f64, ) -> GeoResult<Self>

Create a validated arc.

pub fn from_three_points(a: Point, m: Point, b: Point) -> GeoResult<Self>

Arc through three points a → m → b.

pub fn from_bulge(p0: Point, p1: Point, bulge: f64) -> GeoResult<Self>

Arc between p0 and p1 with DXF-style bulge (tan(sweep/4), positive = CCW).

pub fn bulge(self) -> f64

Bulge value of this arc (tan(sweep/4)).

pub fn end_angle(self) -> f64

End angle (start + sweep).

pub fn point_at(self, t: f64) -> Point

Point at parameter t.

pub fn start_point(self) -> Point

Start point.

pub fn end_point(self) -> Point

End point.

pub fn mid_point(self) -> Point

Midpoint along the arc.

pub fn tangent_at(self, t: f64) -> Vector

Unit tangent at t in the direction of travel.

pub fn length(self) -> f64

Arc length.

pub fn param_of_angle(self, a: f64, eps: f64) -> Option<f64>

Parameter for absolute angle a if it lies on the arc (with eps radians slack).

pub fn closest(self, p: Point) -> (f64, Point)

Closest point on the arc and its parameter.

pub fn distance_to_point(self, p: Point) -> f64

Distance from p to the arc.

pub fn bbox(self) -> Aabb

Exact bounding box.

pub fn reversed(self) -> Self

Reversed arc (same points, opposite direction).

pub fn subarc(self, t0: f64, t1: f64) -> Self

Sub-arc between parameters t0 and t1.

pub fn transform(self, t: Affine) -> GeoResult<Self>

Apply a similarity transform.

pub fn flatten_into(self, tol: f64, out: &mut Vec<Point>)

Append a polyline approximation (excluding the start point) to out.

Trait Implementations

impl Clone for Arc

fn clone(&self) -> Arc

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Arc

impl Debug for Arc

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Arc

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Arc

fn eq(&self, other: &Arc) -> 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 Serialize for Arc

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Arc