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import { roundToPrecisionSmall } from "./mathUtils";
// CIELAB color space
// https://en.wikipedia.org/wiki/CIELAB_color_space
// This implementation uses the D65 constants for 2 degrees. That determines the constants used for the pure white point of the XYZ space of 0.95047, 1.0, 1.08883.
// https://en.wikipedia.org/wiki/Illuminant_D65
// These constants determine how the XYZ, LCH and LAB colors convert to/from RGB.
export class ColorLAB {
public static readonly epsilon: number = 216 / 24389;
public static readonly kappa: number = 24389 / 27;
public static fromObject(data: { l: number; a: number; b: number }): ColorLAB | null {
if (data && !isNaN(data.l) && !isNaN(data.a) && !isNaN(data.b)) {
return new ColorLAB(data.l, data.a, data.b);
}
return null;
}
constructor(l: number, a: number, b: number) {
this.l = l;
this.a = a;
this.b = b;
}
public readonly l: number;
public readonly a: number;
public readonly b: number;
public equalValue(rhs: ColorLAB): boolean {
return this.l === rhs.l && this.a === rhs.a && this.b === rhs.b;
}
public roundToPrecision(precision: number): ColorLAB {
return new ColorLAB(
roundToPrecisionSmall(this.l, precision),
roundToPrecisionSmall(this.a, precision),
roundToPrecisionSmall(this.b, precision)
);
}
public toObject(): { l: number; a: number; b: number } {
return { l: this.l, a: this.a, b: this.b };
}
}
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