;; layerFromColor.lsp
;;
;; Create separate layers for each selected objects different colors. 
;;
;; Created by Peter Gyetvai
;; gyetpet@mailbox.org

(defun C:LFC (/ i imax il ss currElem color colorNum allColors newLayer currLayer newElem) 
    (graphscr)
    
    ; ---------------------------------- prompt ---------------------------------- ;

    (prompt "\nselect entities to change layer (all): ")
    (setq ss (ssget));asks for selection 
    (setq il (sslength ss));length of selection
    (setq allColors nil)

    ; -------------------------- get colors from objects ------------------------- ;

    (setq i 0);counter to zero
    (setq imax 1);while variable

    (while imax 
        ;(print i)
        (setq currElem (entget (ssname ss i) ))
        (setq color (assoc 62 currElem))
        (setq colorNum (cdr color))
        ;(print colorNum)

        (if (and (not (= colorNum 0)) colorNum)
            (progn 
                (if (not (type allColors))( setq allColors (list colorNum)))
                (if (not (member colorNum allColors)) (setq allColors (append allColors (list colorNum))))
            )
        )
    
        ;while specific: 
        (setq i (1+ i));increments i
        (if (= i il) (setq imax nil));finish function if i equals il
    )

    ; ----------------------------- create new layers ---------------------------- ;

    (setq i 0);counter to zero
    (setq imax 1);while variable
    
    (while imax 
        ;(print i)
        (setq color (nth i allColors))

        ; --- create new layers --- ;
        (command "._layer" "_M" color "")
        (command "._layer" "_C" color color "")

        (print )
        (princ "Created layer ")
        (princ color)
        (print )

        ;while specific: 
        (setq i (1+ i));increments i
        (if (= i (length allColors)) (setq imax nil));finish function if i equals il
    )

    ; -------------------------------- set layers -------------------------------- ;
    
    (setq i 0);counter to zero
    (setq imax 1);while variable

    (while imax 
        ;(print i)
        (setq currElem (entget (ssname ss i) ))
        (setq color (assoc 62 currElem))
        (setq colorNum (cdr color))

        (if (and (not (= colorNum 0)) colorNum)
            (progn 


                (setq currLayer (assoc 8 currElem))
                (setq newLayer (cons 8 (itoa colorNum)))
                (setq newElem(subst newLayer currLayer currElem))
                (entmod newElem)
            )
        )
        ;while specific: 
        (setq i (1+ i));increments i
        (if (= i il) (setq imax nil));finish function if i equals il
    )

    ; --------------------------- set color to bylayer --------------------------- ;

    (print )
    (command "_.change" ss "" "_P" "_C" "bylayer" "")

    ; ---------------------------------- finish ---------------------------------- ;

    (terpri)    
    (setq ss nil)
)