Struct CielabColor 

pub struct CielabColor {
    pub l: f32,
    pub a: f32,
    pub b: f32,
}

CIELAB color for perceptually uniform gradients.

CIELAB (Lab*) is designed so that equal distances in the color space correspond to equal perceived color differences.

Example

use probar::brick::tui::CielabColor;

// Create gradient from green (0%) to red (100%)
let green = CielabColor::percent_gradient(0.0);
let red = CielabColor::percent_gradient(1.0);

// Interpolate for 50%
let yellow = green.lerp(&red, 0.5);

Fields

l: f32

Lightness (0-100)

a: f32

Green-red axis (approx -128 to 127)

b: f32

Blue-yellow axis (approx -128 to 127)

Implementations

impl CielabColor

pub const fn new(l: f32, a: f32, b: f32) -> Self

Create a CIELAB color.

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

Interpolate between two colors.

pub fn to_rgb(&self) -> (u8, u8, u8)

Convert to approximate sRGB (0-255).

Note: This is a simplified conversion. For accurate results, use a proper color management library.

pub fn to_hex(&self) -> String

Convert to hex string (e.g., “#ff0000”).

pub fn percent_gradient(percent: f32) -> Self

Create perceptually uniform gradient from green to red.

Uses green -> yellow -> red transition in CIELAB space.

pub fn meter_gradient(level: f32) -> Self

Create gradient for meter display (blue -> green -> yellow -> red).

Trait Implementations

impl Clone for CielabColor

fn clone(&self) -> CielabColor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CielabColor

impl Debug for CielabColor

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

Formats the value using the given formatter.

impl Default for CielabColor

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for CielabColor

fn eq(&self, other: &CielabColor) -> 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 StructuralPartialEq for CielabColor