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-;"tek40.scm", Tektronix 4000 series graphics support in Scheme.
-;Copyright (C) 1992, 1994 Aubrey Jaffer
-;
-;Permission to copy this software, to modify it, to redistribute it,
-;to distribute modified versions, and to use it for any purpose is
-;granted, subject to the following restrictions and understandings.
-;
-;1.  Any copy made of this software must include this copyright notice
-;in full.
-;
-;2.  I have made no warrantee or representation that the operation of
-;this software will be error-free, and I am under no obligation to
-;provide any services, by way of maintenance, update, or otherwise.
-;
-;3.  In conjunction with products arising from the use of this
-;material, there shall be no use of my name in any advertising,
-;promotional, or sales literature without prior written consent in
-;each case.
-
-;THIS FILE NEEDS MORE WORK.
-
-;The Tektronix 4000 series graphics protocol gives the user a 1024 by
-;1024 square drawing area.  The origin is in the lower left corner of
-;the screen.  Increasing y is up and increasing x is to the right.
-
-;The graphics control codes are sent over the current-output-port and
-;can be mixed with regular text and ANSI or other terminal control
-;sequences.
-
-;  (tek40:init)						procedure
-
-(define (tek40:init) 'noop)
-
-(define esc-string (string (integer->char #o33)))
-
-(define tek40:graphics-str
-  (string-append
-   (string slib:form-feed)
-   esc-string  (string (integer->char #o14))
-   ;; clear the screen
-   ))
-
-(define (tek40:graphics) (display tek40:graphics-str) (force-output))
-
-(define (tek40:text)
-  (tek40:move 0 12)
-  (write-char (integer->char #o37)))
-
-(define (tek40:linetype linetype)
-  (cond ((or (negative? linetype) (> linetype 15))
-	 (slib:error "bad linetype" linetype))
-	(else
-	 (display esc-string)
-	 (write-char (integer->char (+ (char->integer #\`) linetype))))))
-
-(define (tek40:move x y)
-  (write-char (integer->char #o35))
-  (tek40:draw x y))
-
-(define (tek40:draw x y)
-  (display (string
-	    (integer->char (+ #x20 (quotient y 32)))
-	    (integer->char (+ #x60 (remainder y 32)))
-	    (integer->char (+ #x20 (quotient x 32)))
-	    (integer->char (+ #x40 (remainder x 32))))))
-
-(define (tek40:put-text x y str)
-  (tek40:move x (+ y -11))
-  (write-char (integer->char #o37))
-  (display str))
-
-(define (tek40:reset) (display tek40:graphics-str) (force-output))
-
-(define (tek40:test)
-  (tek40:init)
-;  (tek40:reset)
-  (tek40:graphics)
-  (tek40:linetype 0)
-  (tek40:move 100 100)
-  (tek40:draw 200 100)
-  (tek40:draw 200 200)
-  (tek40:draw 100 200)
-  (tek40:draw 100 100)
-  (do ((i 0 (+ 1 i)))
-      ((> i 15))
-    (tek40:linetype i)
-    (tek40:move (+ (* 50 i) 100) 100)
-    (tek40:put-text (+ (* 50 i) 100) 100 (number->string i))
-    (tek40:move (+ (* 50 i) 100) 100)
-    (tek40:draw (+ (* 50 i) 200) 200))
-  (tek40:linetype 0)
-  (tek40:text))