Enum Shader 

pub enum Shader {
    Linear {
        start: Point,
        end: Point,
        stops: Vec<GradientStop>,
        spread: SpreadMode,
        local: Matrix,
    },
    Radial {
        center: Point,
        radius: f32,
        stops: Vec<GradientStop>,
        spread: SpreadMode,
        focus: Option<FocalCircle>,
        local: Matrix,
    },
    Sweep {
        center: Point,
        start_angle: f32,
        stops: Vec<GradientStop>,
        local: Matrix,
    },
    Image {
        image: Image,
        sampling: Sampling,
        local: Matrix,
    },
}

Shader determines the color painted at each point of a drawing operation.

Shader coordinates begin in the draw’s local coordinate space, so shaders follow the same transforms as their geometry.

Variants

Linear

Linear interpolates colors along the line from start to end.

Fields

start: Point

start is the zero-offset point in local coordinates.

end: Point

end is the one-offset point in local coordinates.

stops: Vec<GradientStop>

stops defines the colors along the gradient.

spread: SpreadMode

spread controls colors outside the zero-to-one span.

local: Matrix

local transforms the shader independently of the drawn geometry.

Use Matrix::IDENTITY when no additional transform is needed.

Radial

Radial interpolates between a start circle and an end circle.

Fields

center: Point

center is the end circle’s center in local coordinates.

radius: f32

radius is the end circle’s radius in local coordinates.

stops: Vec<GradientStop>

stops defines the colors along the gradient.

spread: SpreadMode

spread controls colors outside the zero-to-one span.

focus: Option<FocalCircle>

focus is the optional start circle.

None starts at a zero-radius circle centered on center.

local: Matrix

local transforms the shader independently of the drawn geometry.

Sweep

Sweep interpolates colors around one full clockwise turn.

Fields

center: Point

center is the sweep origin in local coordinates.

start_angle: f32

start_angle is the zero-offset angle in radians clockwise from +x.

stops: Vec<GradientStop>

stops defines the colors around the sweep.

local: Matrix

local transforms the shader independently of the drawn geometry.

Image

Image samples an image across the drawn geometry.

Fields

image: Image

image supplies the sampled pixels.

sampling: Sampling

sampling controls filtering, mipmaps, and tiling.

local: Matrix

local transforms the image pattern independently of the geometry.

Implementations

impl Shader

pub fn stops(&self) -> &[GradientStop]

stops returns this gradient’s stops or an empty slice for image shaders.

pub fn fold_color_filter(&mut self, filter: &ColorFilter) -> bool

fold_color_filter applies a color filter directly to gradient stops.

It returns false for image shaders, whose colors must be filtered during sampling.

pub fn linear(start: Point, end: Point, from: Color, to: Color) -> Self

linear creates a two-color padded linear gradient.

Trait Implementations

impl Clone for Shader

fn clone(&self) -> Shader

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Shader

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

Formats the value using the given formatter.

impl PartialEq for Shader

fn eq(&self, other: &Shader) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for Shader