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grdraw with true colour and colour book also

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this one I can use only index colour

how can I change to true colour and colour book

(defun c:test(/ ccol)
  (setq ClayP(entget(tblobjname "layer"(setq clay(getvar 'clayer)))))
    (= (getvar 'CECOLOR)"BYLAYER")
    (setq ccol(cdr(assoc 62 ClayP)))
    (setq ccol(atoi(getvar 'CECOLOR)))
  (if (setq pt1 (getpoint "\nSpecify Base Point: "))
            (setq pt1(trans pt1 1 2))
	    (= 5 (car (setq pt3 (grread nil 13 0))))
	    (setq pt4 (cadr pt3)
		  pt4 (trans pt4 1 2))
	    (grdraw pt1 pt4 ccol))))
    (list(cons 0 "line")(cons 8 (getvar 'Clayer))(cons 10 pt1)(cons 11 pt4)))


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As far as I know GRDRAW only accepts and integer for color.

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