Method f

src/engineMath.js:990–993

(p, q, t)

        l = clamp(l);
        const q = l < .5 ? l*(1+s) : l+s-l*s, p = 2*l-q,
            f = (p, q, t)=>
                (t = mod(t,1))*6 < 1 ? p+(q-p)*6*t :
                t*2 < 1 ? q :
                t*3 < 2 ? p+(q-p)*(4-t*6) : p;
        this.r = f(p, q, h + 1/3);
        this.g = f(p, q, h);
        this.b = f(p, q, h - 1/3);