Struct AxialPattern 

pub struct AxialPattern { /* private fields */ }

Linear gradient between two points in device space.

t = dot(p - p0, axis) / |axis|², clamped to [t0, t1] (or extended to the nearest endpoint when extend_start / extend_end is set).

Implementations

impl AxialPattern

pub fn new( color0: [u8; 3], color1: [u8; 3], p0x: f64, p0y: f64, p1x: f64, p1y: f64, t0: f64, t1: f64, extend_start: bool, extend_end: bool, ) -> Self

Create an axial gradient.

• color0, color1: RGB endpoints.
• (p0x, p0y), (p1x, p1y): axis endpoints in device pixels.
• t0, t1: parameter range mapping to color0 / color1. May be inverted (t0 > t1).
• extend_start / extend_end: extend colour beyond axis endpoints.

Degenerate case

When p0 == p1 (zero-length axis) every pixel returns None from t_for, so fill_span writes zeros (per PDF §8.7.4.5).

Trait Implementations

impl Pattern for AxialPattern

fn fill_span(&self, y: i32, x0: i32, x1: i32, out: &mut [u8])

Fill out with colour bytes for pixels x0..=x1 on scanline y.

fn is_static_color(&self) -> bool

Return true if this pattern yields the same colour at every coordinate. When true, fill_span will be called once and the result reused across the whole span (optimisation hint only — correctness is not affected).