Struct ConicShading 

#[non_exhaustive]
pub struct ConicShading {
    pub name: String,
    pub center: Point,
    pub domain: [f64; 4],
    pub matrix: Option<[f64; 6]>,
    pub color_stops: Vec<ColorStop>,
}

Conic (angular / “sweep”) gradient, emitted as an exact Type 1 function-based shading (ISO 32000-1 §8.7.4.5.2) whose /Function is a real Type 4 PostScript calculator: the colour is a resolution-independent function of the angle around center, not a piecewise mesh approximation.

Marked #[non_exhaustive]: build via ConicShading::new / with_matrix so future additive fields stay non-breaking.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

name: String

Shading name for referencing.

center: Point

Centre of the angular sweep, in the shading’s domain coordinates.

domain: [f64; 4]

Domain [xmin xmax ymin ymax] the function is evaluated over.

matrix: Option<[f64; 6]>

Optional matrix mapping domain space to the shading target space.

color_stops: Vec<ColorStop>

Colour stops swept from angle 0 (t=0) to a full turn (t=1).

Implementations

impl ConicShading

pub fn new( name: impl Into<String>, center: Point, domain: [f64; 4], color_stops: Vec<ColorStop>, ) -> Self

Create a conic gradient centred at center over domain.

pub fn with_matrix(self, matrix: [f64; 6]) -> Self

Set the shading-to-target transformation matrix.

pub fn validate(&self) -> Result<()>

Validate stops (non-empty, ascending) and domain (min < max).

pub fn to_pdf_dictionary(&self) -> Result<Dictionary>

Build the Type 1 function-based shading dictionary with a real Type 4 PostScript /Function (angle prologue + colour ramp) and the required /ColorSpace. The /Function is inlined as a stream; the writer hoists it to an indirect object (a stream cannot be a dictionary value).

Trait Implementations

impl Clone for ConicShading

fn clone(&self) -> ConicShading

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ConicShading

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

Formats the value using the given formatter.