Megatest

							fill-color: stdcolor
							line-color: stdcolor))
				     (print "ERROR: curr-tval is not > last-tval; curr-tval " curr-tval ", last-tval " last-tval))))
			   next)
			 ;; for init create vector tstart,0
			 #f ;; (vector tstart minval minval)
			 dat)
			 (vg:add-obj-to-comp
			  cmp
			  (vg:make-text-obj (- (tfn tstart) 10)(- lly 10)(seconds->year-week/day-time tstart)))
			 (let*-values (((span timeunit time-blk first timesym) (common:find-start-mark-and-mark-delta tstart tend)))
			   (let loop ((mark  first)
				      (count 0))
			     (let* ((smark (tfn mark))           ;; scale the mark
				    (mark-delta (quotient (- mark tstart) time-blk)) ;; how far from first mark
				    (label      (conc mark-delta timesym)))
			       (if (> count 2)
				   (begin
				     (vg:add-obj-to-comp
				      cmp
				      (vg:make-rect-obj (- smark 1)(- lly 2)(+ smark 1) lly))
				     (vg:add-obj-to-comp
				      cmp
				      (vg:make-text-obj (- smark 1)(- lly 10) label))))
			       (if (< mark (- tend time-blk))
				   (loop (+ mark time-blk)(+ count 1))))))
			   
			 ;; (for-each
			;;  (lambda (dpt)
			;;    (let* ((tval  (vector-ref dpt 0))
			 ;; 	  (yval  (vector-ref dpt 2))
			;; 	  (stval (tfn tval))
			;; 	  (syval (yfunc yval)))
			;;      (vg:add-obj-to-comp
			;;       cmp 
			;;       (vg:make-rect-obj (- stval 2) lly (+ stval 2)(+ lly (* yval yscale))
			;; 			fill-color: stdcolor))))
			;;  dat)