Megatest

(define (vg:rgb->number r g b #!key (a 0))
  (bitwise-ior
    (arithmetic-shift a 24)
    (arithmetic-shift r 16)
    (arithmetic-shift g 8)
    b))

;; Obsolete function
;;
(define (vg:generate-color)
  (vg:rgb->number (random 255)
                  (random 255)
                  (random 255)))
  ;;(vg:rgb->number 0 0 0))

;; Need to return a string of random iup-color for graph
;;
(define (vg:generate-color-rgb)
  (conc (number->string (random 255)) " "
        (number->string (random 255)) " "
        (number->string (random 255))))

(define (vg:iup-color->number iup-color)
  (apply vg:rgb->number (map string->number (string-split iup-color))))

;;======================================================================
;; graphing
;;======================================================================