import type { FnU5 } from "@thi.ng/api" ; import { setC4 } from "@thi.ng/vectors/setc" ; import { xyzD65 , XYZD65 } from "./xyz65.js" ; remarks param out param lambda param alpha export const wavelengthXyz = ( out , lambda , alpha = 1 ) => { lambda *= 10 ; return < XYZD65 > ( setC4 ( out || xyzD65 ( ) , gaussian ( lambda , 1.056 , 5998 , 379 , 310 ) + gaussian ( lambda , 0.362 , 4420 , 160 , 267 ) + gaussian ( lambda , - 0.065 , 5011 , 204 , 262 ) , gaussian ( lambda , 0.821 , 5688 , 469 , 405 ) + gaussian ( lambda , 0.286 , 5309 , 163 , 311 ) , gaussian ( lambda , 1.217 , 4370 , 118 , 360 ) + gaussian ( lambda , 0.681 , 4590 , 260 , 138 ) , alpha ) ) ; } ; const gaussian = ( x , alpha , m , s1 , s2 ) => { const t = ( x - m ) / ( x < m ? s1 : s2 ) ; return alpha * Math . exp ( - ( t * t ) / 2 ) ; } ;