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|
class Color
{
/** @type {Array<number>} */
channels = []
/**
* Construct a color
* @param {...number} nums
*/
constructor(...nums)
{
this.channels = nums;
}
/**
* @param {Color} b
* @param {number} i
* @returns {Color}
*/
interpolate(b, i)
{
let out = new Color();
for (let c = 0; c < this.channels.length && c < b.channels.length; c++)
{
out.channels.push(b.channels[c] * i + this.channels[c] * (1 - i))
}
return out;
}
/** Get the CSS string representing rgb
* @returns {string}
*/
rgb()
{
return `rgb(${Math.trunc(this.channels[0] * 255)}, ${Math.trunc(this.channels[1] * 255)}, ${Math.trunc(this.channels[2] * 255)})`;
}
/** Get the CSS string representing rgba
* @returns {string}
*/
rgba()
{
return `rgba(${Math.trunc(this.channels[0] * 255)}, ${Math.trunc(this.channels[1] * 255)}, ${Math.trunc(this.channels[2] * 255)}, ${this.channels[3]})`;
}
static from_rgb(r, g, b)
{
return new Color(r / 255, g / 255, b / 255);
}
static from_rgba(r, g, b)
{
return new Color(r / 255, g / 255, b / 255, a);
}
static d(h)
{
let d = Math.floor((h - (h % PI_THIRDS)) / PI_THIRDS);
return (DIVS.length - 1 + d) % (DIVS.length - 1);
}
static from_hsv(h, s, v)
{
h = (((h % TWO_PI)) + TWO_PI) % TWO_PI;
let d = Color.d(h);
h = (h % PI_THIRDS) / PI_THIRDS;
let out = DIVS[d].interpolate(DIVS[d + 1], h);
out = WHITE.interpolate(out, s);
return BLACK.interpolate(out, v);
}
static from_hsl(h, s, l)
{
h = (((h % TWO_PI)) + TWO_PI) % TWO_PI;
let d = Color.d(h);
h = (h % PI_THIRDS) / PI_THIRDS;
let out = DIVS[d].interpolate(DIVS[d + 1], h);
let L = BLACK.interpolate(WHITE, l);
if (l < 0.5)
out = BLACK.interpolate(out, l / 0.5);
else
out = out.interpolate(WHITE, (l - 0.5) / 0.5);
return L.interpolate(out, s);
}
}
const RED = new Color(1, 0, 0, 1);
const YELLOW = new Color(1, 1, 0, 1);
const GREEN = new Color(0, 1, 0, 1);
const CYAN = new Color(0, 1, 1, 1);
const BLUE = new Color(0, 0, 1, 1);
const MAGENTA = new Color(1, 0, 1, 1);
const WHITE = new Color(1, 1, 1, 1);
const BLACK = new Color(0, 0, 0, 1);
const PI_THIRDS = Math.PI / 3;
const TWO_PI = Math.PI * 2;
const DIVS = [RED, YELLOW, GREEN, CYAN, BLUE, MAGENTA, RED];
/**
* Interpolate between two colors
* @param {Color} a
* @param {Color} b
* @param {number} p
*/
function interpolate(a, b, p)
{
}
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