Struct Color 

pub struct Color {
    pub r: f32,
    pub g: f32,
    pub b: f32,
    pub a: f32,
}

RGBA color with values in the range [0.0, 1.0].

Examples

use presentar_core::Color;

let color = Color::new(0.5, 0.5, 0.5, 1.0);
assert_eq!(color.r, 0.5);
assert_eq!(color.a, 1.0);

Fields

r: f32

Red component [0.0, 1.0]

g: f32

Green component [0.0, 1.0]

b: f32

Blue component [0.0, 1.0]

a: f32

Alpha component [0.0, 1.0]

Implementations

impl Color

pub const BLACK: Self

Black color

pub const WHITE: Self

White color

pub const RED: Self

Red color

pub const GREEN: Self

Green color

pub const BLUE: Self

Blue color

pub const YELLOW: Self

Yellow color

pub const TRANSPARENT: Self

Transparent color

pub fn new(r: f32, g: f32, b: f32, a: f32) -> Self

Create a new color, clamping values to [0.0, 1.0].

pub fn rgb(r: f32, g: f32, b: f32) -> Self

Create an opaque color from RGB values.

pub fn from_hex(hex: &str) -> Result<Self, ColorParseError>

Parse a hex color string (e.g., “#ff0000” or “ff0000”).

Supports 6-character RGB and 8-character RGBA formats.

Errors

Returns an error if the string is not a valid hex color.

pub fn to_hex(&self) -> String

Convert to hex string (RGB only).

pub fn to_hex_with_alpha(&self) -> String

Convert to hex string with alpha.

pub fn relative_luminance(&self) -> f32

Calculate relative luminance per WCAG 2.1.

See: https://www.w3.org/TR/WCAG21/#dfn-relative-luminance

pub fn contrast_ratio(&self, other: &Self) -> f32

Calculate contrast ratio between two colors per WCAG 2.1.

Returns a value between 1.0 (no contrast) and 21.0 (maximum contrast).

See: https://www.w3.org/TR/WCAG21/#dfn-contrast-ratio

pub fn lerp(&self, other: &Self, t: f32) -> Self

Linear interpolation between two colors.

pub fn rgba(r: f32, g: f32, b: f32, a: f32) -> Self

Create a color with explicit alpha value.

Trait Implementations

impl Clone for Color

fn clone(&self) -> Color

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Color

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

Formats the value using the given formatter.

impl Default for Color

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for Color

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Color

fn eq(&self, other: &Color) -> 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 Color

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Copy for Color

impl StructuralPartialEq for Color