Struct SpanGradient 

pub struct SpanGradient<'a, G, F> { /* private fields */ }

Main gradient span generator.

Combines an interpolator (for coordinate transformation), a gradient function (for shape), and a color function (for color lookup) to produce gradient-colored pixel spans.

Port of C++ span_gradient<ColorT, Interpolator, GradientF, ColorF>.

Implementations

impl<'a, G: GradientFunction, F: ColorFunction> SpanGradient<'a, G, F>

pub fn new( interpolator: SpanInterpolatorLinear, gradient_function: G, color_function: &'a F, d1: f64, d2: f64, ) -> Self

pub fn interpolator(&self) -> &SpanInterpolatorLinear

pub fn interpolator_mut(&mut self) -> &mut SpanInterpolatorLinear

pub fn gradient_function(&self) -> &G

pub fn color_function(&self) -> &F

pub fn d1(&self) -> f64

pub fn d2(&self) -> f64

pub fn set_d1(&mut self, v: f64)

pub fn set_d2(&mut self, v: f64)

Trait Implementations

impl<'a, G, F> SpanGenerator for SpanGradient<'a, G, F>

where G: GradientFunction, F: ColorFunction, F::Color: Copy,

type Color = <F as ColorFunction>::Color

fn prepare(&mut self)

Called once before rendering begins.

fn generate(&mut self, span: &mut [F::Color], x: i32, y: i32, len: u32)

Generate colors for a horizontal span.