TIL how to convert a hex triplet to racket/draw color
;; Convert hex triplet to `racket/draw` color
;; hex-triplet->color% : hex -> colour%
(define (hex-triplet->color% x)
(define-values [r g b]
(values (arithmetic-shift x -16)
(bitwise-and #x0000ff (arithmetic-shift x -8))
(bitwise-and #x0000ff x)))
(make-color r g b))
> (hex-triplet->color% #xdf542f)
(object:color% ...)
from https://gitlab.com/bengreenman/pict-abbrevs/-/blob/master/private/pict-abbrevs.rkt#L188 thanks @ben_greenman